Meteoric fluid infiltration in the Argentine Precordillera fold-and-thrust belt: Evidence from H isotopic studies of neoformed clay minerals
Fluids in the upper crust can affect the strength properties, composition, and mineralization of rock units, but the source(s) of these fluids and their transport during deformation are not well understood. Stable isotopic studies of clay-rich rocks, particularly newly formed illitic clays, shed light on the source of geofluids involved during faulting and folding. Hydrogen isotopic (δD) measurements of fault gouge and folded clay-rich sediments from the Argentine Precordillera show meteoric, surface-sourced fluid involvement during Miocene faulting. The δD composition of neoformed clay minerals is between −70‰ and −90‰ ± 2‰. The associated composition of fluids ranges from −57‰ to −72‰ ± 10‰, matching values for a surface-derived source. Regional Miocene meteoric fluid infiltrated down into the evolving fold-and-thrust belt, accumulated in basin sediments, and was subsequently expelled by the overriding rock units during late Miocene shortening. A systematic increase in δD signature with deformation age is preserved that matches regional climatic changes during late Miocene aridification, cooling, and glacial expansion.
- 원문이 없습니다.
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기