Middle-late Miocene (>10 Ma) formation of the Main Boundary thrust in the western Himalaya

Abstract

Research Article| May 01, 1995 Middle-late Miocene (>10 Ma) formation of the Main Boundary thrust in the western Himalaya Andrew J. Meigs; Andrew J. Meigs 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740 Search for other works by this author on: GSW Google Scholar Douglas W. Burbank; Douglas W. Burbank 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740 Search for other works by this author on: GSW Google Scholar Richard A. Beck Richard A. Beck 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740 Search for other works by this author on: GSW Google Scholar Author and Article Information Andrew J. Meigs 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740 Douglas W. Burbank 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740 Richard A. Beck 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1995) 23 (5): 423–426. https://doi.org/10.1130/0091-7613(1995)023<0423:MLMMFO>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Andrew J. Meigs, Douglas W. Burbank, Richard A. Beck; Middle-late Miocene (>10 Ma) formation of the Main Boundary thrust in the western Himalaya. Geology 1995;; 23 (5): 423–426. doi: https://doi.org/10.1130/0091-7613(1995)023<0423:MLMMFO>2.3.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 Three independent data sets from northwestern India and Pakistan suggest initial displacement along >1000 km of the Main Boundary thrust prior to 10 Ma, at least 5 m.y. earlier than previously reported. Regionally extensive changes in the depositional characteristics and rates of the foreland-basin fill between 11 and 9.5 Ma are interpreted to reflect new hinterland loading due to the formation of the Main Boundary thrust. Sediment-accumulation rates, sandstone-siltstone ratios, and thickness and amalgamation of individual sandstone bodies all substantially increase after 11 Ma in well-dated stratigraphic sections from Pakistan to Nepal across the Indo-Gangetic foreland basin. In the Himachal Pradesh reentrant of northwestern India, a newly discovered 8.7 Ma conglomerate derived from the hanging wall of the Main Boundary thrust indicates that source-area uplift and denudation must have occurred prior to 9 Ma and probably prior to 10 Ma, assuming a gravel progradation rate of 3 cm/yr. Three apatite fission-track ages from structures at the leading edge of the Main Boundary thrust in the Kohat region of northwest Pakistan indicate that rapid cooling below ∼105° C between 8 and 10 Ma followed bedrock uplift and erosion that began ∼1–2 m.y. earlier. These data indicate that the Main Boundary thrust in the western Himalaya formed synchronously along strike in the middle-late Miocene, has a displacement rate of ∼10 mm/yr, and has a displacement history that is coeval with late displacement on the Main Central thrust. 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.