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Journal of Asian earth sciences 27건

  1. [해외논문]   Inside front cover (Editorial Board)  


    Journal of Asian earth sciences v.151 ,pp. IFC , 2018 , 1367-9120 ,

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  2. [해외논문]   Inside front cover (Editorial Board)   SCIE


    Journal of Asian earth sciences v.151 ,pp. IFC - IFC , 2018 , 1367-9120 ,

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  3. [해외논문]   Provenance discrimination of sediments in the Zhejiang-Fujian mud belt, East China Sea: Implications for the development of the mud depocenter   SCIE

    Liu, Xiting (Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China ) , Li, Anchun (Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China ) , Dong, Jiang (Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China ) , Lu, Jian (Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China ) , Huang, Jie (Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China ) , Wan, Shiming (Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China)
    Journal of Asian earth sciences v.151 ,pp. 1 - 15 , 2018 , 1367-9120 ,

    초록

    Abstract In the past decade, the 800 km elongated mud belt off Zhejiang-Fujian coast, East China Sea (ECS), has been extensively studied for understanding the source to sink processes on the East Asian continental margin in the context of the Asian monsoon. However, to better understand the sediment source and dispersal pattern, the existing mineralogical and geochemical data of adjacent river systems, including the Changjiang River (CJR) and local rivers in Zhejiang, Fujian and Taiwan, need to be systematically reviewed. Therefore, various indicators from published literatures for the provenance discrimination in the mud belt have been summarised in this article. The results show that high diversity of clay mineral assemblages in fluvial sediments being supplied into the mud belt, e.g., dominant illite and chlorite in the CJR, absence of smectite in Taiwan rivers, similar amounts of the four clay mineral species in Zhejiang rivers, and dominant kaolinite in Fujian rivers. On heavy mineralogy, the CJR is dominated by dolomite, hornblende, and flaky minerals; and among of them, dolomite is distinctive for the CJR. For geochemical approaches, elemental compositions, combined with strontium and neodymium isotopes, reflect strong provenance control. However, geochemical and mineralogical compositions are found to vary with grain size, and thus extra caution should be taken when using these parameters as provenance indicator to discriminate the marine sediments with variety of grain-size fractions. In addition, pyrrhotite, occurred in fluvial sediments from western Taiwan, has not been found in sediments derived from mainland China, indicating that magnetic parameters could be used to discriminate sediment provenance. The mud belt formed during sea-level highstand, when modern current system in the ECS has been established, resulting in sediments derived from the CJR have been transported southward since 8 ka. In addition, sediment provenances have not been constant since initiation of the mud belt in response to climatic and oceanographic changes during the Holocene, which has been documented by mineral and geochemical signals. Nevertheless significant studies have been carried out, to better understand the formation mechanism for the mud belt and its implications for environmental changes, further studies on sediment provenance throughout the Holocene, in situ observation, and sedimentation dynamical modelling are required. Graphical abstract [DISPLAY OMISSION]

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  4. [해외논문]   Tectono-geomorphic indices of the Erin basin, NE Kashmir valley, India   SCIE

    Ahmad, Shabir (Department of Geography & Regional Development, University of Kashmir, Srinagar 190006, India ) , Alam, Akhtar (Department of Geography & Regional Development, University of Kashmir, Srinagar 190006, India ) , Ahmad, Bashir (Department of Geology, Nawakadal School, Srinagar 190002, India ) , Afzal, Ahsan (Department of Earth Sciences, University of Kashmir, Srinagar 190006, India ) , Bhat, M.I. (Department of Earth Sciences, University of Kashmir, Srinagar 190006, India ) , Sultan Bhat, M. (Department of Geography & Regional Development, University of Kashmir, Srinagar 190006, India ) , Farooq Ahmad, Hakim (Department of Geography & Regional Development, University of Kashmir, Srinagar 190006, India)
    Journal of Asian earth sciences v.151 ,pp. 16 - 30 , 2018 , 1367-9120 ,

    초록

    Abstract The present study aims to assess the tectonic activity in the Erin basin (NE Kashmir) on the basis of several relevant geomorphic indices and field observations. We use Digital Elevation Model (SRTM) and Survey of India (SoI) topographic maps in GIS environment to compute the geomorphic indices. The indices i.e., convex hypsometric curve, high hypsometric integral value (H i > 0.5), low basin elongation ratio (Eb = 0.17), low mountain front sinuosity values (S mf = 1.08 average), low valley floor width ratios (Vf 4) suggest that the area is tectonically active. Moreover, prominent irregularities (knickpoints/knickzones) along longitudinal profile of the Erin River even in homogenous resistant lithology (Panjal trap) and anomalous stream gradient index (SL) values reflect that the Erin basin is dissected by two faults (EF-1 and EF-2) with NNW-SSE and SSW-NNE trends respectively. The results of this preliminary study further substantiate the recent GPS studies, which argue that the maximum strain is accumulating in the NE part of the Kashmir Himalaya. Highlights This article presents an analysis of geomorphic indices in the Erin basin, Kashmir valley. Geomorphic indices reveal tectonic control on geomorphology of the Erin basin. Field evidence is suggestive of two faults (EF-1 and EF-2) in the Erin basin. Graphical abstract [DISPLAY OMISSION]

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  5. [해외논문]   Rapid retreat of the East Asian summer monsoon in the middle Holocene and a millennial weak monsoon interval at 9 ka in northern China   SCIE

    Dong, Jinguo (College of Geosciences, Nantong University, Nantong 226007, China ) , Shen, Chuan-Chou (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei 106, Taiwan, ROC ) , Kong, Xinggong (College of Geosciences, Nanjing Normal University, Nanjing 210097, China ) , Wu, Chung-Che (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei 106, Taiwan, ROC ) , Hu, Hsun-Ming (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei 106, Taiwan, ROC ) , Ren, Haojia (Department of Geosciences, National Taiwan University, Taipei 106, Taiwan, ROC ) , Wang, Yi (Department of Geography, School of Global Studies, University of Sussex, Brighton BN1 9QJ, UK)
    Journal of Asian earth sciences v.151 ,pp. 31 - 39 , 2018 , 1367-9120 ,

    초록

    Abstract Knowledge of hydroclimatic dynamics in the East Asian monsoon region during the Holocene was hindered by few absolutely-dated and decadally-resolved proxy records in northern China. Here we present replicated carbonate δ 18 O records of six stalagmites with sub-decadal to multi-decadal resolutions from the Lianhua cave to reveal a detailed evolution of the East Asian Summer Monsoon (EASM) intensity in northern China since 11.5 thousand years before present (ka BP, before 1950 CE). Our composite record shows that solar forcing dominated hydroclimatic changes regionally, including an intensified monsoon at the Holocene Optimum from the termination of Younger Dryas to 6.5 ka BP, and a subsequent multi-millennial weakening monsoon, that agrees with cave records in central and southern China. However, the EASM has retreated southwards more rapidly than the Indian summer monsoon after ∼6.5 ka BP, resulting in aridity conditions occurring at 4.0 ka BP in northern China, which is almost 2000-year earlier than that in central and southern China. This north–south asynchroneity is likely related to the different regional responses among the coupling of the EASM, Indian summer monsoon, the solar forcing, and the differences in thermal forcing due to complex geographical configurations. In addition, a relative enrichment of 1‰ in 18 O data of the Lianhua record from 9.5 to 8.1 ka BP shows that the Holocene Optimum was punctuated by a millennial-long weakening monsoon interval, which is not registered among previous cave records in central and southern China. The fresh water-induced cold climate conditions in the North Atlantic region could create stronger East Asian winter monsoon, and induce a weakened EASM and a southward shift of rain belt in northern China. Therefore, it shall not be surprised that there are strong heterogeneities among regional hydroclimatic conditions across monsoonal China, given the complex interplay between external and internal forcing mechanisms over the entire Holocene. Highlights An absolutely-dated, high-resolution speleothem δ 18 O record is reported for the entire Holocene in northern China. The East Asian summer monsoon (EASM) retreated southwards more rapidly than the Indian summer monsoon (ISM) after ∼6.5 ka BP. The early-Holocene aridity from 9.5 to 8.1 ka BP was more severe in northern China than southern China. The late-Holocene aridity began to occur at around 4 ka BP, almost 2000-year earlier than that in central and southern China. New insights into the interplay of external and internal forcing mechanisms on the Asian summer monsoon (ASM). Graphical abstract [DISPLAY OMISSION]

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  6. [해외논문]   Seismic evidence for change of the tectonic regime in Messinian, northern Marmara Sea, Turkey   SCIE

    Alp, Hakan (Department of Geophysical Engineering, Faculty of Engineering, Istanbul University, 34320 Avcılar, Istanbul, Turkey ) , Vardar, Denizhan (Institute of Marine Sciences and Management, Istanbul University, 34134 Vefa, Istanbul, Turkey ) , Alpar, Bedri (Institute of Marine Sciences and Management, Istanbul University, 34134 Vefa, Istanbul, Turkey ) , Ustaö (Department of Geological Engineering, Faculty of Engineering, Istanbul University, 34320 Avcılar, Istanbul, Turkey) , mer, Timur
    Journal of Asian earth sciences v.151 ,pp. 40 - 53 , 2018 , 1367-9120 ,

    초록

    Abstract New Chirp seismic data collected from the northern margin of the Marmara Sea in June 2015 and previous Sparker seismic profiles recorded in 1999 suggest a change in tectonic regime in Messinian. New tectonic lineaments and fault segments were detected at offshore the Cekmece lagoons region that is located on one of the possible water corridors with the Paratethys. The faults only affect the older seismic unit (U1), which can be best outlined on the Chirp data. The E-W trending fault offshore Avcılar (OAF) borders the northern edge of a tightly folded sedimentary zone. The NNE-SSW trending fault, namely the BUyUkCekmece Fault (BF), passing through the BUyUkCekmece Bay, follows a buried valley. Its evolution must be related to the development of the Early Miocene – Early Pliocene Thrace-Eskişehir fault zone (TEFZ). BF and OAF indicate old tectonic activities in the region, which continued to the North Anatolian fault becoming the most dominant tectonic element in the region. The upper surface of the stratigraphic unit U1 and its terraces define the thickness of younger deposits (U2), which is thinner in the middle of the shelf. The morphology of the tightly folded zone controls those terraces, which correspond to the BakırkOy Formation and KıraC member on land. The topmost parts of the terraces must have been eroded during sea level low-stands and cutting of the paleo-valleys. There is no evidence of any tectonic deformation or active fault in the younger seismic unit (U2). Highlights Seismic data show a change in tectonic regime offshore the Cekmece lagoons. This change occurred in the Marmara Sea during Early Miocene-Early Pliocene. A fault-controlled paleo-valley is suggested as a pathway to the Paratethys. The new tectonic regime is dominated by the North Anatolian Fault system. It poses large earthquake risk along the densely populated northern coasts. Graphical abstract [DISPLAY OMISSION]

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  7. [해외논문]   A prolonged Cenozoic erosional period in East Kunlun (Western China): Constraints of detrital apatite (U-Th)/He ages on the onset of mountain building along the northern margin of the Tibetan Plateau   SCIE

    Shi, Wenbei (State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China ) , Wang, Fei (State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China ) , Wu, Lin (State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China ) , Yang, Liekun (State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China ) , Zhang, Weibin (State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China ) , Wang, Yinzhi (State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China)
    Journal of Asian earth sciences v.151 ,pp. 54 - 61 , 2018 , 1367-9120 ,

    초록

    Abstract The timing of the development of the highland topography along the northern margin of the Tibetan Plateau is the key to understanding the manner of Tibetan growth and the far-field effects of the collision between India and Eurasia. Although various studies have investigated the exhumation and uplift of the basement rocks, thermochronological studies on the detritus from a continuous depositional sequence inan intermontane basin are lacking but might shed light on this issue. In this study, a set of detrital apatites from an upper Eocene to Pliocene depositional sequence in the Kumukol Basin, the largest intermontane basin in the East Kunlun, were dated by using the (U-Th)/He technique. The detrital apatites had consistent ages of ∼40Ma for all deposit formations from bottom to top, which were older than the depositional ages. The ages and their consistency suggested that these detrital apatites were not reset and that the ages represented the original ages in the provenance region. These detrital apatite ages from the upper Eocene to Pliocene formations strongly suggested that the high mountains surrounding the Kumukol Basin formed at or before ∼40Ma and have remained high since then. The process of mountain building resulted in a prolonged period of erosion from ∼40 to 2.6Ma. The coupling of mountain and basin at ∼40Ma was widespread along the East Kunlun. Our present results constrain the time of onset of the mountain building along the northern margin of the Tibetan Plateau, which may represent a rapid response to the India-Eurasian collision. Highlights Apatite grains in Kumukol Basin were dated by using (U-Th)/He technique. Apatite grains yield ages of 40Ma which are older than their depositional ages. The ages of the detritals represent their original ones in the provenance region. Mountain building occurred at 40Ma and was followed by a prolonged erosion period. Graphical abstract [DISPLAY OMISSION]

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  8. [해외논문]   Geochemistry, 40Ar/39Ar geochronology, and geodynamic implications of Early Cretaceous basalts from the western Qinling orogenic belt, China   SCIE

    Zhang, Feifei (State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China ) , Wang, Yuejun (Guangdong Provincal Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China ) , Cawood, Peter A. (Department of Earth Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK ) , Dong, Yunpeng (State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China)
    Journal of Asian earth sciences v.151 ,pp. 62 - 72 , 2018 , 1367-9120 ,

    초록

    Abstract The Qinling-Dabie orogenic belt was formed by the collision of the North and South China Cratons during the Early Mesozoic and subsequently developed into an intracontinental tectonic process during late Mesozoic. Field investigations identified the presence of late Mesozoic basalts in the Duofutun and Hongqiang areas in the western Qinling orogenic belt. The petrogenesis of these basalts provides an important constraint on the late Mesozoic geodynamics of the orogen. The representative basaltic samples yield the 40 Ar/ 39 Ar plateau age of about 112 Ma. These samples belong to the alkaline series and have SiO 2 ranging from 44.98 wt.% to 48.19 wt.%, Na 2 O + K 2 O from 3.44 wt% to 5.44 wt%, and MgO from 7.25 wt.% to 12.19 wt.%. They demonstrate the right-sloping chondrite-normalized REE patterns with negligible Eu anomalies (1.00–1.10) and PM-normalized patterns enriched in light rare earth element, large ion lithophile element and high field strength element, similar to those of OIB rocks. These samples additionally show an OIB-like Sr-Nd isotopic signature with ε Nd (t) values ranging from +6.13 to +10.15 and initial 87 Sr/ 86 Sr ratios from 0.7028 to 0.7039, respectively. These samples are geochemically subdivided into two groups. Group 1 is characterized by low Al 2 O 3 and high TiO 2 and P 2 O 5 contents, as well as high La/Yb ratios (>20), being the product of the high-pressure garnet fractionation from the OIB-derived magma. Group 2 shows higher Al 2 O 3 but lower P 2 O 5 contents and La/Yb ratios ( Highlights Basalts from the western Qinling orogenic belt were erupted at ∼112 Ma. These basalts were originated from asthenospheric mantle with the lithospheric component. A petrogenetic model is proposed for Early Cretaceous lithosphere delamination in response to asthenospheric upwelling. Graphical abstract [DISPLAY OMISSION]

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  9. [해외논문]   Sedimentary characteristics of thick layer lacustrine beach-bars in the Cenozoic Banqiao Sag of the Bohai Bay Basin, East China   SCIE

    Song, Fan (School of Geosciences, China University of Petroleum, Qingdao 266580, China ) , Su, Nina (School of Geosciences, China University of Petroleum, Qingdao 266580, China ) , Yang, Shaochun (School of Geosciences, China University of Petroleum, Qingdao 266580, China ) , Yao, Ruixiang (No. 4 Oil Production Plant, Dagang Oil Field Company of Petrochina, Tianjin 300280, China ) , Chu, Shumin (No. 4 Oil Production Plant, Dagang Oil Field Company of Petrochina, Tianjin 300280, China)
    Journal of Asian earth sciences v.151 ,pp. 73 - 89 , 2018 , 1367-9120 ,

    초록

    Abstract Lacustrine beach-bar reservoirs have become important exploration targets in the Bohai Bay Basin in China, especially in the Banqiao Sag within the Huanghua Depression, where some typical thick layer beach-bar reservoirs have been discovered recently. The average single-layer thickness of the beach-bar sand bodies in the second member of the Paleogene Shahejie Formation within the sag is greater than 10 m and the cumulative thickness of these sands reach up to 100 m. The second member of the Shahejie Formation in the Banqiao Sag consists of a third-order sequence of three systems tracts—a lowstand systems tract, a transgressive systems tract, and a highstand systems tract. Beach-bar sand bodies were deposited widely in the sag in the lowstand systems tract, but were less deposited in the other systems tracts. The sedimentary characteristics, distribution patterns, and formation mechanisms of the beach-bar sand bodies in the lowstand systems tract of the second member of the Shahejie Formation were systemically studied using cores, wireline logs and 3D seismic data. The beach-bar was divided into five sedimentary microfacies, namely, sandy bar centre, sandy bar flank, interbar deposit, coastal beach, and infralittoral beach. Based on the integrated analysis of the paleostructure and sedimentary environment, it was inferred that the thick layer beach-bars in this area resulted from the combination and joint control of the sediment source system, hydrodynamic environment, lake level variations, and contemporaneous fault activity. Firstly, the sands in the braided river delta of the Beidagang buried hill structural belt served as the provenance that provided the material basis for the beach-bars in the Banqiao Sag. Secondly, the wave effects in the gentle-slope belt controlled the scale and distribution of the beach bars. Under the control of waves, various sedimentary microfacies were regularly distributed. In particular, the continuous activity of the contemporaneous Dazhangtuo Fault contributed to the formation of the thick layer beach-bars in the Banqiao Sag. The contemporaneous fault controlled the allocation of the sediments, providing abundant sands in the downthrown side of the fault. In addition, there was a constant high-energy hydrodynamic environment near the fault plane, where the sand bodies experienced long-term reworking by waves and gradually formed beach-bars with large thickness. The activity of the contemporaneous fault increased the accommodation space in the lowstand systems tract of the second member of the Shahejie Formation, which resulted in continuous sand deposition and provided the necessary conditions for forming the thick layer beach-bars. Highlights Thick layer beach-bar sand bodies were deposited widely in the Banqiao Sag. The formation of beach-bars was specially controlled by contemporaneous faults. A new depositional model of thick layer beach-bar sand bodies was proposed. Graphical abstract [DISPLAY OMISSION]

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  10. [해외논문]   Causes of earthquake spatial distribution beneath the Izu-Bonin-Mariana Arc   SCIE

    Kong, Xiangchao (Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China ) , Li, Sanzhong (Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China ) , Wang, Yongming (Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China ) , Suo, Yanhui (Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China ) , Dai, Liming (Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China ) , Gé (Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China ) , li, Louis (Key) , Zhang, Yong , Guo, Lingli , Wang, Pengcheng
    Journal of Asian earth sciences v.151 ,pp. 90 - 100 , 2018 , 1367-9120 ,

    초록

    Abstract Statistics about the occurrence frequency of earthquakes (1973–2015) at shallow, intermediate and great depths along the Izu-Bonin-Mariana (IBM) Arc is presented and a percent perturbation relative to P-wave mean value (LLNL-G3Dv3) is adopted to show the deep structure. The correlation coefficient between the subduction rate and the frequency of shallow seismic events along the IBM is 0.605, proving that the subduction rate is an important factor for shallow seismic events. The relationship between relief amplitudes of the seafloor and earthquake occurrences implies that some seamount chains riding on the Pacific seafloor may have an effect on intermediate-depth seismic events along the IBM. A probable hypothesis is proposed that the seamounts or surrounding seafloor with high degree of fracture may bring numerous hydrous minerals into the deep and may result in a different thermal structure compared to the seafloor where no seamounts are subducted. Fluids from the seamounts or surrounding seafloor are released to trigger earthquakes at intermediate-depth. Deep events in the northern and southern Mariana arc are likely affected by a horizontal propagating tear parallel to the trench. Highlights Fluids from the seamounts subduction may cause the seismic segmentation along the IBM. Slab tears under the Mariana Arc affect magmatic and seismic distribution. Subduction rate is an important factor for shallow seismic events along the IBM. Graphical abstract [DISPLAY OMISSION]

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