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Zanskar shear zone: Northeast-southwest extension within the Higher Himalayas (Ladakh, India)

1987; Geological Society of America; Volume: 15; Issue: 5 Linguagem: Inglês

10.1130/0091-7613(1987)15 2.0.co;2

1943-2682

Eveline Herren,

Geological and Geophysical Studies Worldwide

Research Article| May 01, 1987 Zanskar shear zone: Northeast-southwest extension within the Higher Himalayas (Ladakh, India) Eveline Herren Eveline Herren 1Geologisches Institut, ETH Zentrum, CH-8092 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information Eveline Herren 1Geologisches Institut, ETH Zentrum, CH-8092 Zürich, Switzerland Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1987) 15 (5): 409–413. https://doi.org/10.1130/0091-7613(1987)15 2.0.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Eveline Herren; Zanskar shear zone: Northeast-southwest extension within the Higher Himalayas (Ladakh, India). Geology 1987;; 15 (5): 409–413. doi: https://doi.org/10.1130/0091-7613(1987)15 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 SocietyGeology Search Advanced Search Abstract A complete geologic section through the northwestern Himalayas is well exposed in Ladakh, India. The collision between the Indian shield and the Tibetan platform caused large-scale intracrustal thrusting and piling up of the Himalayan nappes. This compressional event was accompanied by prograde regional metamorphism. The metamorphism ranges from low-grade (anchimetamorphism) in the Indus suture zone in the northeast to upper amphibolite grade in the Higher Himalaya tectonic unit in the southwest.In the Zanskar area a well-exposed and morphologically prominent shear zone, 2.25 to 6.75 km wide, can be followed from the northwest to the southeast for at least 80 km. In contrast to the main compressional tectonics, this shear zone indicates an extensional event within the Higher Himalaya tectonic unit. The Zanskar shear zone involves granitic rocks, leucogranites of Miocene age, and various metasediments and, in general, separates the late Precambrian–Early Cambrian sedimentary sequence (Phe Formation) from the underlying crystalline basement (Zanskar Crystalline unit). A normal sense of shear has been determined by using asymmetric macroscopic and microscopic structures such as pegmatite boudins, feldspar augen, and crystallographic fabrics. The metamorphic isograds are very close within this shear zone as a result of shear deformation; a gradual transition from upper amphibolite to lower greenschist facies occurs within 200 m. Movement in this zone occurred late in the metamorphic history under greenschist or lower metamorphic conditions. The minimum horizontal extension and vertical displacement are on the order of 16 and 19 km, respectively. 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.