Title: Synchronous Oligocene-Miocene metamorphism of the Pamir and the north Himalaya driven by plate-scale dynamics
Abstract: Research Article| October 01, 2013 Synchronous Oligocene–Miocene metamorphism of the Pamir and the north Himalaya driven by plate-scale dynamics Michael A. Stearns; Michael A. Stearns 1Earth Science Department, University of California–Santa Barbara, Santa Barbara, California 93106, USA Search for other works by this author on: GSW Google Scholar Bradley R. Hacker; Bradley R. Hacker 1Earth Science Department, University of California–Santa Barbara, Santa Barbara, California 93106, USA Search for other works by this author on: GSW Google Scholar Lothar Ratschbacher; Lothar Ratschbacher 2Geologie, Technische Universität Bergakademie Freiberg, 09599 Freiberg, Germany Search for other works by this author on: GSW Google Scholar Jeffrey Lee; Jeffrey Lee 3Geological Sciences, Central Washington University, Ellensburg, Washington 98926, USA Search for other works by this author on: GSW Google Scholar John M. Cottle; John M. Cottle 1Earth Science Department, University of California–Santa Barbara, Santa Barbara, California 93106, USA Search for other works by this author on: GSW Google Scholar Andrew Kylander-Clark Andrew Kylander-Clark 1Earth Science Department, University of California–Santa Barbara, Santa Barbara, California 93106, USA Search for other works by this author on: GSW Google Scholar Geology (2013) 41 (10): 1071–1074. https://doi.org/10.1130/G34451.1 Article history received: 04 Feb 2013 rev-recd: 27 May 2013 accepted: 30 May 2013 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Michael A. Stearns, Bradley R. Hacker, Lothar Ratschbacher, Jeffrey Lee, John M. Cottle, Andrew Kylander-Clark; Synchronous Oligocene–Miocene metamorphism of the Pamir and the north Himalaya driven by plate-scale dynamics. Geology 2013;; 41 (10): 1071–1074. doi: https://doi.org/10.1130/G34451.1 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 SocietyGeology Search Advanced Search Abstract Gneiss domes in the Pamir (Central Asia) and the Himalaya provide key data on mid- to deep-crustal processes operating during the India-Asia collision. Laser ablation split-stream inductively coupled plasma–mass spectrometry (LASS-ICP-MS) data from monazite in these domes yield a time record from U/Th-Pb dates and a petrologic record from rare earth element (REE) abundances. Seven samples from the Pamir and six samples from the north Himalayan gneiss domes yield almost identical monazite dates of ca. 28–15 Ma. Most monazite has invariant heavy REE (HREE) abundances; two samples, however, have older monazite that records progressive HREE depletion and two samples have younger monazite that records progressive HREE enrichment. These variations in HREE are compatible with increasing garnet abundance—prograde metamorphism—until ca. 20 Ma, and decreasing garnet abundance thereafter. The change from HREE depletion to enrichment may record a transition from crustal thickening and heating to dome exhumation and cooling. This documentation of synchronous Barrovian metamorphism within domes of Indian crust along the margin of the orogen (Himalaya) and within domes of Asian crust within the core of the orogen (Pamir) is best explained by a plate-scale driving force rather than by local events. We propose that widespread, synchronous thickening was initiated by the resumption of Indian subduction following slab breakoff and then terminated by a second slab-tearing event—both plate-scale events inferred from tomography. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 2013
Publication Date: 2013-07-30
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 84
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