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The lower Lesser Himalayan sequence: A Paleoproterozoic arc on the northern margin of the Indian plate

2009; Geological Society of America; Volume: 122; Issue: 3-4 Linguagem: Inglês

10.1130/b26587.1

1943-2674

Matthew J. Kohn, Sanjoy Kumar Paul, S. L. Corrie,

earthquake and tectonic studies

Research Article| March 01, 2010 The lower Lesser Himalayan sequence: A Paleoproterozoic arc on the northern margin of the Indian plate Matthew J. Kohn; Matthew J. Kohn 1Department of Geosciences, Boise State University, Boise, Idaho 83725, USA Search for other works by this author on: GSW Google Scholar Sudip K. Paul; Sudip K. Paul 2Wadia Institute of Himalayan Geology, Dehra Dun, India Search for other works by this author on: GSW Google Scholar Stacey L. Corrie Stacey L. Corrie 1Department of Geosciences, Boise State University, Boise, Idaho 83725, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Matthew J. Kohn 1Department of Geosciences, Boise State University, Boise, Idaho 83725, USA Sudip K. Paul 2Wadia Institute of Himalayan Geology, Dehra Dun, India Stacey L. Corrie 1Department of Geosciences, Boise State University, Boise, Idaho 83725, USA †E-mail: mattkohn@boisestate.edu Publisher: Geological Society of America Received: 28 Nov 2008 Revision Received: 07 Apr 2009 Accepted: 23 Apr 2009 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2010 Geological Society of America GSA Bulletin (2010) 122 (3-4): 323–335. https://doi.org/10.1130/B26587.1 Article history Received: 28 Nov 2008 Revision Received: 07 Apr 2009 Accepted: 23 Apr 2009 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Matthew J. Kohn, Sudip K. Paul, Stacey L. Corrie; The lower Lesser Himalayan sequence: A Paleoproterozoic arc on the northern margin of the Indian plate. GSA Bulletin 2010;; 122 (3-4): 323–335. doi: https://doi.org/10.1130/B26587.1 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 lower Lesser Himalayan sequence marks the northern extremity of the exposed Indian plate, and is generally interpreted as a passive margin. Five lines of evidence, however, collectively suggest a continental arc setting: (1) igneous intrusions and volcanic rocks occur at this stratigraphic level across the length of the Himalaya, (2) ages of intrusive and metavolcanic (?) rocks cluster at 1780–1880 Ma but also indicate a long-lived igneous process, (3) detrital zircon ages in clastic rocks cluster at 1800–1900 Ma, with a unimodal age distribution in some rocks, (4) the mineralogy and chemistry of metasedimentary rocks differ from typical shales and suggest a volcanogenic source, (5) trace-element chemistries of orthogneisses and metabasalts are more consistent with either an arc or a collisional setting. Intercalation of volcanic rocks with clastic sediments and a general absence of Proterozoic metamorphic ages do not support a collisional origin. An arc model further underscores the profound unconformity separating lower-upper Lesser Himalayan rocks, indicating that a Paleoproterozoic arc may have formed the stratigraphic base of the northern Indian margin. This, in turn, may indicate disposition of the Indian plate adjacent to North America in the ca. 1800 Ma supercontinent Columbia. Felsic orthogneisses (“Ulleri”) likely represent shallow intrusions, not Indian basement. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.