1996/07/01 by Randall R. Parrish, V. Hodges, K. V. Hodges · 8 citations
Earth and Planetary Sciences · #Geology and Paleoclimatology Research #Geological and Geochemical Analysis #earthquake and tectonic studies
paper · doi:10.1130/0016-7606(1996)108<0904:icotaa>2.3.co;2
Research Article| July 01, 1996 Isotopic constraints on the age and provenance of the Lesser and Greater Himalayan sequences, Nepalese Himalaya Randall R. Parrish; Randall R. Parrish 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada, K1A 0E8 Search for other works by this author on: GSW Google Scholar V. Hodges V. Hodges 2Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Search for other works by this author on: GSW Google Scholar Author and Article Information Randall R. Parrish 1Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada, K1A 0E8 V. Hodges 2Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1996) 108 (7): 904–911. https://doi.org/10.1130/0016-7606(1996)108<0904:ICOTAA>2.3.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 Randall R. Parrish, V. Hodges; Isotopic constraints on the age and provenance of the Lesser and Greater Himalayan sequences, Nepalese Himalaya. GSA Bulletin 1996;; 108 (7): 904–911. doi: https://doi.org/10.1130/0016-7606(1996)108<0904:ICOTAA>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 SocietyGSA Bulletin Search Advanced Search Abstract The Main Central thrust of the central Himalaya juxtaposes the Lesser Himalayan sequence (footwall) with the Greater Himalayan sequence (hanging wall), both of which are regarded as components of the northern passive margin of India. Considerable uncertainty surrounds their respective ages and sedimentary derivation.U-Pb and Sm-Nd isotopic studies of samples from the Langtang area, central Nepal, demonstrate important distinctions between the two rock packages. The Greater Himalayan sequence had a sedimentary provenance that included a major source of 0.8–1.0 Ga zircons, implying a Late Proterozoic age. The source of the Precambrian part of the Lesser Himalayan sequence contained 1.87–2.60 Ga zircons, and its depositional age is probably Middle Proterozoic. Nd isotopic characteristics of the two sequences are different: at 21 Ma, the Greater Himalayan rocks had eNd values between −14.6 and −18.5 while their Lesser Himalayan counterparts had values between −21.4 and −25.9, giving rise to major differences in their model ages.The Lesser and Greater Himalayan sequences at Langtang are interpreted as correlative to the lower and upper parts of the Vindhyan Supergroup, currently exposed south of the Gangetic plain in northern India. On the basis of available age data, the exposed hanging wall of the Main Central thrust in central and eastern Nepal contains no Archean-Early Proterozoic basement. If the fault does root into the basement at depth, it must do so farther north than recently published cross sections indicate. This implies a total displacement on the fault that is substantially greater than the 140–210 km required by tectonic overlap in the eastern Himalayas. 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.