Structure of the Vakhsh fold-and-thrust belt, Tadjik SSR: Geologic mapping on a Landsat image base

Research Article| July 01, 1985 Structure of the Vakhsh fold-and-thrust belt, Tadjik SSR: Geologic mapping on a Landsat image base WILLIAM LEITH; WILLIAM LEITH 1Lamont-Doherty Geological Observatory, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar WALTER ALVAREZ WALTER ALVAREZ 2Department of Geology and Geophysics, University of California, Berkeley, California 94720 Search for other works by this author on: GSW Google Scholar Author and Article Information WILLIAM LEITH 1Lamont-Doherty Geological Observatory, Palisades, New York 10964 WALTER ALVAREZ 2Department of Geology and Geophysics, University of California, Berkeley, California 94720 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1985) 96 (7): 875–885. https://doi.org/10.1130/0016-7606(1985)96<875:SOTVFB>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation WILLIAM LEITH, WALTER ALVAREZ; Structure of the Vakhsh fold-and-thrust belt, Tadjik SSR: Geologic mapping on a Landsat image base. GSA Bulletin 1985;; 96 (7): 875–885. doi: https://doi.org/10.1130/0016-7606(1985)96<875:SOTVFB>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract An enhanced Landsat image of the northeastern Tadjik Depression in the Soviet Union was combined with field data to produce a 1:250,000 geologic map of the Vakhsh fold-and-thrust belt and adjacent autochthon. Mapping of the relatively continuous geologic structure in this region first required recognizing marker beds and contacts at or near the resolution of the Landsat sensor and then defining mappable units. Satellite image mapping was complemented by field study, which was necessary in this recently deformed area, both to verify the image mapping and to obtain more accurate structural dips. Deformation of the Cretaceous and Tertiary strata of the fold-and-thrust belt is, in the western half of the mapped area, conspicuously absent north of a buried basement fault that marks the hinge zone of the late Mesozoic passive margin. In the eastern half of the mapped area, however, the major thrusts (displacing rocks northward) have moved coherent sheets over the block fault. These sheets now lie flat atop the autochthon to the north. Tectonically, these observations indicate that (1) the crustal structure inherited from the Mesozoic extensional phase has strongly influenced the late Cenozoic pattern of deformation, (2) the thrust sheets that are displaced over the paleo-hinge zone actively load the basement rocks to the north, and (3) the development of the fold-and-thrust belt (which is markedly asymmetric) has included the progressive overlapping of thrusts. The later thrusts apparently formed internal to the older thrusts and subsequently overrode them. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Перевод пока недоступен