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Journal of African earth sciences 37건

  1. [해외논문]   Editorial Board   SCIE


    Journal of African earth sciences v.139 ,pp. ii - ii , 2018 , 1464-343x ,

    초록

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  2. [해외논문]   Hydrochemical and isotopic characterization of groundwater in the Ghis-Nekor plain (northern Morocco)   SCIE

    Chafouq, D. (Laboratory GEOHYD, Faculty of Sciences Semlalia, University Cadi Ayyad, Morocco ) , El Mandour, A. (Laboratory GEOHYD, Faculty of Sciences Semlalia, University Cadi Ayyad, Morocco ) , Elgettafi, M. (OLMAN-RL Laboratory, BP 300 Selouane, 62702, University Mohamed I Oujda, Morocco ) , Himi, M. (Faculty of Geology, University of Barcelona, Marti I Franques, S/N, 08028 Barcelona, Spain ) , Chouikri, I. (Laboratory GEOHYD, Faculty of Sciences Semlalia, University Cadi Ayyad, Morocco ) , Casas, A. (Faculty of Geology, University of Barcelona, Marti I Franques, S/N, 08028 Barcelona, Spain)
    Journal of African earth sciences v.139 ,pp. 1 - 13 , 2018 , 1464-343x ,

    초록

    Abstract The coastal aquifer of Ghis-Nekor (Morocco) was studied to identify the major processes causing salinization of groundwater. In fact, a geochemical approach multi tracer (general chemistry and isotopes - δ 2 H, δ 18 O- H2O , δ 34 S, δ 18 O- SO4 ) was utilized, with the hydrodynamics to explain the processes responsible for the salinization of groundwater, and for identttifying areas most vulnerable to seawater intrusion. The recharge of the aquifer is mainly by the Al-Khattabi dam, the Nekor River and the Ghis River, on the eastern border of the plain. The water that feeds the aquifer shows a relatively high level of salinity and for this reason, the majority of sampled wells indicate high values of electric conductivity and total salinity which arrives at 7.5 g L −1 . The plot of the geochemical results analyzes of groundwater in the Piper diagram shows two distinct chemical facies; sodium chloride-facies and chlorinated calcium and magnesium sulfated facies. The concentrations of 18 O range between −4.15‰ and −5.73‰, while the values of 2 H range between −28.4‰ and −41.7‰. The Nekor river water is depleted in heavy isotopes, and the isotopic compositions are in the order on −6‰ for 18 O and −40.5‰ for deuterium. Most of the wells have a slope 18 O- SO4 vary between 4.35‰ and 8.60‰, while the 34 S isotope values range from −4.3‰ to 9.9‰. For Ghis River, these values are between −4.4‰ and 4.95‰, respectively, for sulfur and oxygen. The interpretation of the chemical and isotopic results suggesting the intrusion of seawater to increase salinity of groundwater in the region is low. However, only the NE area shows probable contamination of seawater. In contrast, wells are saline independent of seawater intrusion, the origin of the high salinity can be related to: 1- the accumulation of rivers fluid intake and water dam rich dissolved salts and sulphates, 2- the anthropogenic pollution (domestic sewage, agricultural inputs, septic uses). Highlights Combining piezometric, hydrochemical and isotopic data for characterizing saltwater intrusion in Ghis-Nekor aquifer. The low Intervention of seawater in increased salinity of groundwater in the Ghis-Nekor plain. The origin of the high mineralization can be associated to recharging by mineralized water and anthropogenic pollution. New support for groundwater research in the north of Morocco.

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  3. [해외논문]   Structural interpretation of aeromagnetic data for the Wadi El Natrun area, northwestern desert, Egypt   SCIE

    Ibraheem, Ismael M. (Institute of Geophysics and Meteorology, Cologne University, Pohligstr.3, 50969 Köln, Germany ) , Elawadi, Eslam A. (Deanship of Scientific Research, King Saud University, Riyadh, Saudi Arabia ) , El-Qady, Gad M. (National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Cairo, Egypt)
    Journal of African earth sciences v.139 ,pp. 14 - 25 , 2018 , 1464-343x ,

    초록

    Abstract The Wadi El Natrun area in Egypt is located west of the Nile Delta on both sides of the Cairo–Alexandria desert road, between 30°00′ and 30°40′N latitude, and 29°40′ and 30°40′E longitude. The name refers to the NW-SE trending depression located in the area and containing lakes that produce natron salt. In spite of the area is promising for oil and gas exploration as well as agricultural projects, Geophysical studies carried out in the area is limited to the regional seismic surveys accomplished by oil companies. This study presents the interpretation of the airborne magnetic data to map the structure architecture and depth to the basement of the study area. This interpretation was facilitated by applying different data enhancement and processing techniques. These techniques included filters (regional-residual separation), derivatives and depth estimation using spectral analysis and Euler deconvolution. The results were refined using 2-D forward modeling along three profiles. Based on the depth estimation techniques, the estimated depth to the basement surface, ranges from 2.25 km to 5.43 km while results of the two-dimensional forward modeling show that the depth of the basement surface ranges from 2.2 km to 4.8 km. The dominant tectonic trends in the study area at deep levels are NW (Suez Trend), NNW, NE, and ENE (Syrian Arc System trend). The older ENE trend, which dominates the northwestern desert is overprinted in the study area by relatively recent NW and NE trends, whereas the tectonic trends at shallow levels are NW, ENE, NNE (Aqaba Trend), and NE. The predominant structure trend for both deep and shallow structures is the NW trend. The results of this study can be used to better understand deep-seated basement structures and to support decisions with regard to the development of agriculture, industrial areas, as well as oil and gas exploration in northern Egypt. Highlights The main contribution of our paper is an assessment of the basement depth and structure in the Wadi El Natrun Area, Egypt. It provides information about the subsurface geology in an area slated for agricultural and industrial development, as well as oil and gas exploration in northern Egypt. Our research is of particular interest and use to geoscientists and local stakeholders. Further, we believe that the findings match the aims and scope of your journal because it addresses one of the main topics covered by your journal.

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  4. [해외논문]   Stratigraphy, facies analysis and depositional environments of the Upper Unit of Abu Roash "E" member in the Abu Gharadig field, Western Desert, Egypt   SCIE

    Hewaidy, Abdel Galil (Geology Department, Faculty of Science, Al- Azhar University, Egypt ) , Elshahat, O.R. (Geology Department, Faculty of Science, Al- Azhar University, Egypt ) , Kamal, Samy (Gulf of Suez Petroleum Company (GUPCO), Egypt)
    Journal of African earth sciences v.139 ,pp. 26 - 37 , 2018 , 1464-343x ,

    초록

    Abstract Abu Roach "E" member is of an important hydrocarbon reservoir-producing horizon in the Abu Gharadig Field (north Western Desert, Egypt). This study is used to build facies analysis and depositional environments model for the Upper Unit of the Abu Roash "E" member in Abu Gharadig Field. This target has been achieved throughout the sedimentological, wire line logs, lithostratigraphic and biostratigraphic analyses of more than 528 feet cores. The high-resolution biostratigraphic analysis provides a calibration for the paleo-bathymetry and depositional environmental interpretations. Biozonation and lithostratigraphic markers are used to constrain stratigraphic correlation. Integration between the core description and petorographic microfacies analysis by microscope examination provide an excellent indication for the rock types and depositional environments. Five depositional facies types are detected including carbonate inner ramp, tidal flats, tidal channels, supra-tidal and tide dominated delta facies. This model helps in the understanding of the Upper Unit of Abu Roash "E" member reservoir distribution as well as lateral and vertical facies changes that contribute to the development strategy for the remaining hydrocarbon reserves for this important oil reservoir. Highlights Detailed zonation for Abu Roash "E" Member in Abu Gharadig oil field. Core description and facies analysis. Shallow marine depositional environment. Lateral and vertical variation in facies and net sand distribution map.

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  5. [해외논문]   Zircon U-Pb ages and Hf isotope data from the Kukuluma Terrain of the Geita Greenstone Belt, Tanzania Craton: Implications for stratigraphy, crustal growth and timing of gold mineralization   SCIE

    Kwelwa, S.D. (Economic Geology Research Centre (EGRU) and Department of Earth and Oceans, James Cook University, Townsville, 4011, QLD, Australia ) , Sanislav, I.V. (Economic Geology Research Centre (EGRU) and Department of Earth and Oceans, James Cook University, Townsville, 4011, QLD, Australia ) , Dirks, P.H.G.M. (Economic Geology Research Centre (EGRU) and Department of Earth and Oceans, James Cook University, Townsville, 4011, QLD, Australia ) , Blenkinsop, T. (School of Earth & Ocean Sciences, Cardiff University, Cardiff CF10 3AT, United Kingdom ) , Kolling, S.L. (Geita Gold Mine, Geita, P.O. Box 532, Geita Region, Tanzania)
    Journal of African earth sciences v.139 ,pp. 38 - 54 , 2018 , 1464-343x ,

    초록

    Abstract The Geita Greenstone Belt is a late Archean greenstone belt located in the Tanzania Craton, trending approximately E-W and can be subdivided into three NW-SE trending terrains: the Kukuluma Terrain to the east, the Central Terrain in the middle and the Nyamullilima Terrain in the west. The Kukuluma Terrain, forms a NW-SE trending zone of complexly deformed sediments, intruded by the Kukuluma Intrusive Complex which, contains an early-syntectonic diorite-monzonite suite and a late-syntectonic granodiorite suite. Three gold deposits (Matandani, Kukuluma and Area 3W) are found along the contact between the Kukuluma Intrusive Complex and the sediments. A crystal tuff layer from the Kukuluma deposits returned an age of 2717 ± 12 Ma which can be used to constrain maximum sedimentation age in the area. Two granodiorite dykes from the same deposit and a small granodiorite intrusion found along a road cut yielded zircon ages of 2667 ± 17 Ma, 2661 ± 16 Ma and 2663 ± 11 Ma respectively. One mineralized granodiorite dyke from the Matandani deposit has an age of 2651 ± 14 Ma which can be used to constrain the maximum age of the gold mineralization in the area. The 2717 Ma crystal tuff has zircon grains with suprachondritic 176 Hf/ 177 Hf ratios (0.28108–0.28111 at 2717 Ma) and positive (+1.6 to +2.6) εHf values indicating derivation from juvenile mafic crust. Two of the granodiorite samples have suprachondritic 176 Hf/ 177 Hf ratios (avg. 0.28106 and 0.28107 at 2663 and 2651 Ma respectively) and nearly chondritic εHf values (avg. −0.5 and −0.3 respectively). The other two granodiorite samples have chondritic 176 Hf/ 177 Hf ratios (avg. 0.28104 and 0.28103 at 2667 and 2661 Ma respectively) and slightly negative εHf values (avg. −1.1 and −1.5 respectively). The new zircon age and isotope data suggest that the igneous activity in the Kukuluma Terrain involves a significant juvenile component and occurred within the 2720 to 2620 Ma period which, is the main period of crustal growth in the northern half of the Tanzania Craton. Highlights Kukuluma Terrain forms the eastern part of the Geita Greenstone Belt and hosts three major gold deposits. The main period of deformation and intrusive activity occurred between 2700 Ma and 2650 Ma. Crustal growth occurred between 2720 Ma and 2620 Ma from mainly a juvenile source. The maximum age of gold mineralization is 2650 Ma. Graphical abstract [DISPLAY OMISSION]

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  6. [해외논문]   Magnetic fabric and flow direction in the Ediacaran Imider dyke swarms (Eastern Anti-Atlas, Morocco), inferred from the Anisotropy of Magnetic Susceptibility (AMS)   SCIE

    Otmane, Khadija (Equipe de Géodynamique, Géo-éducation et Patrimoine Géologique, Chouaïb Doukkali University, Faculty of Sciences, BP 20, 24000, El Jadida, Morocco ) , Errami, Ezzoura (Equipe de Géodynamique, Géo-éducation et Patrimoine Géologique, Chouaïb Doukkali University, Faculty of Sciences, BP 20, 24000, El Jadida, Morocco ) , Olivier, Philippe (Géosciences Environnement Toulouse (GET) - UMR 5563, Université) , Berger, Julien (de Toulouse, CNRS, IRD, OMP, F-31400 Toulouse, France ) , Triantafyllou, Antoine (Géosciences Environnement Toulouse (GET) - UMR 5563, Université) , Ennih, Nasser (de Toulouse, CNRS, IRD, OMP, F-31400 Toulouse, France )
    Journal of African earth sciences v.139 ,pp. 55 - 72 , 2018 , 1464-343x ,

    초록

    Abstract Located in the Imiter Inlier (Eastern Saghro, Anti-Atlas, Morocco), Ediacaran volcanic dykes have been studied for their petrofabric using Anisotropy of Magnetic Susceptibility (AMS) technique. Four dykes, namely TF, TD, FF and FE show andesitic compositions and are considered to belong to the same dyke swarm. They are oriented respectively N25E, N40E, N50E, and N10E and have been emplaced during a first tectonic event. The dyke FW, oriented N90E displays a composition of alkali basalt and its emplacement is attributed to a subsequent tectonic event. These rocks are propylitized under greenschist facies conditions forming a secondary paragenesis constituted by calcite, chlorite, epidote and sericite. The dykes TF, TD, FF and FE are sub-volcanic calc-alkaline, typical of post-collisional basalts/andesites, belonging to plate margin andesites. The FW dyke shows a within-plate basalt signature; alkaline affinity reflecting a different petrogenetic process. The thermomagnetic analyses show a dominantly ferromagnetic behaviour in the TF dyke core carried by single domain Ti-poor magnetite, maghemite and pyrrhotite. The dominantly paramagnetic susceptibilities in TF dyke rims and TD, FE, FF and FW dykes are controlled by ilmenite, amphibole, pyroxene and chlorite. The magnetic fabrics of the Imider dykes, determined by our AMS study, allows us to reconstitute the tectonic conditions which prevailed during the emplacement of these two generations of volcanic dykes. The first tectonic event was characterized by a roughly NE-SW compression and the second tectonic event is characterized by an E-W shortening followed by a relaxation recording the end of the Pan-African orogeny in the eastern Anti-Atlas. Highlights A petrographic and chemical composition identifies NNE calc-alkaline and EW alkaline distinct dyke swarms. A transtensive post-collisional environment of Imider mafic dykes. Magnetic fabrics indicate two tectonic events prevail along the Northern part of the WAC during late panafrican orogeny.

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  7. [해외논문]   Hydrocarbon potential, palynology and palynofacies of four sedimentary basins in the Benue Trough, northern Cameroon   SCIE

    Bessong, Moï (Institute for Geological and Mining Research (IRGM), B.P. 4110 Yaoundé, Cameroon ) , se (Institute for Geological and Mining Research (IRGM), B.P. 4110 Yaoundé, Cameroon ) , Hell, Joseph Victor (Department of Earth Sciences, University of Geneva, 13, Rue des Maraîchers, 1205 Geneva, Switzerland ) , Samankassou, Elias (Department of Earth Sciences, University of Geneva, 13, Rue des Maraîchers, 1205 Geneva, Switzerland ) , Feist-Burkhardt, Susanne (Institute for Geological and Mining Research (IRGM), B.P. 4110 Yaoundé, Cameroon ) , Eyong, John Takem (Department of Earth Sciences, University of Yaoundé) , Ngos, Simon III (I, B.P. 812 Yaoundé, Cameroon ) , Nolla, Junior Dé (Institute for Geological and Mining Research (IRGM), B.P. 4110 Yaoundé, Cameroon ) , siré (Department of Earth Sciences, University of Yaoundé) , (I, B.P. 812 Yaoundé, Cameroon ) , Mbesse, Cecile Olive (Institute of Earth Sciences (ISTE), University of Lausanne, Building Géopolis, 1015 Lausanne, Switzerland ) , Adatte, Thierry (Institute for Geological and Mining Research (IRGM), B.P. 4110 Yaoundé, Cameroon ) , Mfoumbeng, Marie Paule (Institute for Geologi) , Dissombo, Edimo André , Noel , Ntsama, Atangana Jacqueline , Mouloud, Bennami , Ndjeng, Emmanuel
    Journal of African earth sciences v.139 ,pp. 73 - 95 , 2018 , 1464-343x ,

    초록

    Abstract Organic geochemical, palynological and palynofacies analyses were carried out on 79 selected samples from four sedimentary basins (Mayo-Rey, Mayo-Oulo-Lere, Hamakoussou and Benue) in northern Cameroon. Rock-Eval pyrolysis and Total Organic Carbon results indicate that most of the samples of the studied basins are thermally immature to mature. The organic matter consists of terrestrial components (peat, lignite, bituminous coal, and anthracite) associated with organic matter of marine origin. Based on the appraisal of multiple parameters: Total Organic Carbon (TOC), maximum Temperature (T-max), Hydrogen Index (HI), Oxygen Index (OI) and Production Index (PI), some samples are organically rich both in oil and/or gas-prone kerogen Type-II, II/III and III. The source rock quality ranges from poor to very good. The source material is composed of both algae and higher plants. Samples from these basins yielded palynological residue composed of translucent and opaque phytoclasts, Amorphous Organic Matter (AOM), fungal remains, algal cysts pollen and pteridophyte spores. Abundance and diversity of the palynomorphs overall low and include Monoporopollenites annulatus (= Monoporites annulatus ), indeterminate periporate pollen, indeterminate tetracolporate pollen, indeterminate tricolporate pollen, indeterminate triporate pollen, indeterminate trilete spores, Polypodiaceoisporites spp., Biporipsilonites sp., Rhizophagites sp., Striadiporites sp., Botryococcus sp. (colonial, freshwater green algae), and Chomotriletes minor (cyst of zygnematalean freshwater green algae). Age assigned confidently for all these basins the palynological data except for one sample of Hamakoussou that can be dated as Early to Mid-Cretaceous in age. Callialasporites dampieri , Classopollis spp., Eucommiidites spp. and Araucariacites australis indicate, an Aptian to Cenomanian age. The other pollen and spores recovered may indicate a Tertiary or younger age (especially Monoporopollenites annulatus ), or have arisen from modern contamination. Geochemical data show that sediments are wackes, arkose, iron-sandstone and iron-shale. The Chemical Index of Alteration (CIA-K) is low moderate to high, suggesting a shorter exposure time and fast erosion and transport. The studied sequences cover various depositional settings ranging from wetlands to dry environment inside island arc, passive margin or active continental margin. This study reveals new data and the economic potential of this part of Cameroon. Highlights The BT is a fluvial depositional system, whereas the HB, MOLB and MRB are fluvio-lacustrine. Some samples contain almost sufficient amounts of organic matter to generate petroleum. Primary source of terrestrial material is of continental origin. HB, MOLB, MRB and BT samples can be dated Cretaceous to Tertiary in age.

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  8. [해외논문]   Benthic foraminiferal assemblages as bio-indicators of metals contamination in sediments, Qarun Lake as a case study, Egypt   SCIE

    Abd El Naby, Ahmed (University of Ain Shams, Faculty of Science, Geology Department, 11566 Cairo, Egypt ) , Al Menoufy, Safia (University of Ain Shams, Faculty of Education, Department of Geology, Cairo, Egypt ) , Gad, Ahmed (University of Ain Shams, Faculty of Science, Geology Department, 11566 Cairo, Egypt)
    Journal of African earth sciences v.139 ,pp. 96 - 112 , 2018 , 1464-343x ,

    초록

    Abstract Qarun Lake, in the Fayoum Depression of the Western Desert of Egypt, lies within the deepest area in the River Nile flood plain. The drainage water in the Qarun Lake is derived from the discharge of the natural and artificial drainage systems in the Fayoum. Mixed domestic and agricultural pollutants, including heavy metals, nitrates, phosphates, sulfates and pesticides, are discharged into Qarun Lake. Forty-six samples, collected from the undisturbed layer of sediments were used for benthic foraminiferal analysis. Concentrations of some selected trace metal elements (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Sr, V, and Zn) were also determined. Statistical analysis of the abiotic variables (Texture distribution of sediments, Physico-chemical parameters, and metals concentrations) and of the biotic variables (distribution of benthic foraminiferal species) were also performed. The Q-mode cluster analysis of benthic foraminiferal distribution has provided evidence that the Qarun Lake can be subdivided into two cluster groups (A and B), reflecting environmental changes in the lake ecosystem. Cluster B can also be subdivided into two sub-clusters (B1 and B2). The presence of only pollution tolerant taxa with higher faunal density and lower diversity and the absence of the other foraminiferal assemblages in cluster A were attributed to the high concentration of trace metal elements and the strong environmental stress at the eastern and central parts of the Qarun Lake. Highlights Present work shows effect of trace element contamination on distribution of benthic foraminiferal assemblages in Qarun Lake. The Qarun is contaminated by sewage wastes, heavy metals, agricultural and domestic effluents. Forty-six samples were used for benthic foraminiferal analysis and concentrations of trace metals were also determined. Statistical analysis of the abiotic variables and of the biotic variables was also performed. The Q-mode cluster analysis of benthic foraminiferal distribution subdivided the Qarun Lake into two clusters (A and B).

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  9. [해외논문]   2D seismic interpretation and characterization of the Hauterivian–Early Barremian source rock in Al Baraka oil field, Komombo Basin, Upper Egypt   SCIE

    Ali, Moamen (Geology Department, Faculty of Science, Assiut University, Assiut 71516, Egypt ) , Darwish, M. (Geology Department, Faculty of Science, Cairo University, Cairo, Egypt ) , Essa, Mahmoud A. (Geology Department, Faculty of Science, Assiut University, Assiut 71516, Egypt ) , Abdelhady, A. (DEA Egypt, Cairo, Egypt)
    Journal of African earth sciences v.139 ,pp. 113 - 119 , 2018 , 1464-343x ,

    초록

    Abstract Komombo Basin is located in Upper Egypt about 570 km southeast of Cairo; it is an asymmetrical half graben and the first oil producing basin in Upper Egypt. The Six Hills Formation is of Early Cretaceous age and subdivided into seven members from base to top (A–G); meanwhile the B member is of Hauterivian–Early Barremian and it is the only source rock of Komombo Basin. Therefore, a detailed study of the SR should be carried out, which includes the determination of the main structural elements, thickness, facies distribution and characterization of the B member SR which has not been conducted previously in the study area. Twenty 2D seismic lines were interpreted with three vertical seismic profiles (VSP) to construct the depth structure-tectonic map on the top of the B member and to highlight the major structural elements. The interpretation of depth structure contour map shows two main fault trends directed towards the NW-SE and NE to ENE directions. The NW-SE trend is the dominant one, creating a major half-graben system. Also the depth values range from −8400 ft at the depocenter in the eastern part to −4800 ft at the shoulder of the basin in the northwestern part of the study area. Meanwhile the Isopach contour map of the B member shows a variable thickness ranging between 300 ft to 750 ft. The facies model shows that the B member SR is composed mainly of shale with some sandstone streaks. The B member rock samples were collected from Al Baraka-1 and Al Baraka SE-1 in the eastern part of Komombo Basin. The results indicate that the organic matter content (TOC) has mainly good to very good (1–3.36 wt %), The B member samples have HI values in the range 157–365 (mg HC/g TOC) and dominated by Type II/III kerogen, and is thus considered to be oil-gas prone based on Rock-Eval pyrolysis, Tmax values between 442° and 456° C therefore interpreted to be mature for hydrocarbon generation. Based on the measured vitrinite equivalent reflectance values, the B member SR samples have a range 0.7–1.14%Ro, in the oil generation window. Highlights The B member (Hauterivian-Early Barremian) is the only source rock of Komombo Basin. The interpretation of depth structure contour map shows two main fault trends directed towards the NW-SE and NE to ENE directions. The NW-SE trend is the dominant one, creating a major half-graben system. The Isopach contour map of the B member shows a variable thickness ranging between 300 ft in the northwestern part to 750 ft in the eastern part of the study area. The results of the B member samples indicate that the organic matter content (TOC) has mainly good to very good (1–3.36 wt %), HI values range from 157 to 365 (mg HC/g TOC) and dominated by Type II/III kerogen. Tmax values of the B member SR between 442° and 456° C therefore interpreted to be mature for hydrocarbon generation.The B member SR samples have a range 0.7–1.14%Ro, in the oil generation window.

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  10. [해외논문]   Geochemistry and tectonic setting of the Golabad granitoid complex (SW Nain, Iran)   SCIE

    Mansouri Esfahani, Mahin (Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran ) , Khalili, Mahmoud (Department of Geology, University of Isfahan, Isfahan, Iran ) , Alaminia, Zahra (Department of Geology, University of Isfahan, Isfahan, Iran)
    Journal of African earth sciences v.139 ,pp. 120 - 132 , 2018 , 1464-343x ,

    초록

    Abstract The Oligo-Miocene Golabad granitoid complex intrusive into the Eocene volcanic rocks occurs in the Urumieh-Dokhtar Magmatic Arc (UDMA) in Iran. According to microscopic and chemical studies, the granitoid complex consists of three different rock types: 1) plutonic rocks comprising diorite, quartz diorite, granodiorite and granite; 2) volcanic rocks composed of basalt, andesite basalt, ± pyroxene bearing andesite and rhyolite, and 3) pyroclastic rocks. The main mineral constituents of these rocks are mostly plagioclase (oligoclase and andesine), quartz, K-feldspar, amphibole (magnesio-hornblende and actinolite-hornblende) and Mg-biotite. In addition, apatite, titanite, zircon, and opaque minerals are common accessory minerals. The studied enclaves are classified as mafic micro-granular enclaves (MME) with monzodiorite compositions. Geochemically, the rocks in this study represent medium to high-K calc-alkaline series, metaluminous and I-type nature. Plotting, the chemical composition of plagioclase on the An-Ab-Or ternary diagram, the temperature of crystallization is estimated to range from 700 to 900 °C at a pressure of 4.5 Kbar. High TiO 2 values of biotites from the Golabad granitoid complex suggest magmatic origin and the crystallization temperature is estimated to range from 700 to 750 °C. The amphiboles according to their chemical analysis, are classified as igneous amphiboles generated in high oxygen fugacity conditions. The chemical data of the amphiboles and biotites pointed out to the I- type nature of the Golabad granitoid complex emplaced in an active continental margin subduction setting. The amphibole crystallization pressure was estimated by Al in amphibole varies from 1.09 to 2.28 Kbar. Using the calculated pressure the depth of the formation of the Golabad granitoid complex estimated from 4 to 9 Km. Highlights The Plagioclase crystallized from 700 to 900 °C and at a pressure of 4.5 Kbar. The Biotite components showed magmatic nature, and it's crystallized from 700 to 750 °C in temperature. The amphiboles classified as igneous amphiboles which generated in high oxygen fugacity. The amphiboles and biotites chemical data pointed out to I- type with an active continental margin subduction setting. The depth of the formation of the Golabad granitoid complex estimated from 4 to 9 Km.

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