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Precise temperature estimation in the Tibetan crust from seismic detection of the α-β quartz transition

2004; Geological Society of America; Volume: 32; Issue: 7 Linguagem: Inglês

10.1130/g20367.1

1943-2682

J. Mechie, S. V. Sobolev, Lothar Ratschbacher, Andrey Babeyko, G. Bock, Alan G. Jones, K. D. Nelson, K. D. Solon, L. D. Brown, Wei Zhao,

High-pressure geophysics and materials

Research Article| July 01, 2004 Precise temperature estimation in the Tibetan crust from seismic detection of the α-β quartz transition J. Mechie; J. Mechie 1GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar S.V. Sobolev; S.V. Sobolev 2GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany, and Institute of Physics of the Earth, Moscow, Russia Search for other works by this author on: GSW Google Scholar L. Ratschbacher; L. Ratschbacher 3Institut für Geologie, Technische Universität Freiberg, 09599 Freiberg, Germany Search for other works by this author on: GSW Google Scholar A. Y. Babeyko; A. Y. Babeyko 4GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar G. Bock; G. Bock 4GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar A.G. Jones; A.G. Jones 5Geological Survey of Canada, Ottawa, Ontario, Canada, and Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Search for other works by this author on: GSW Google Scholar K.D. Nelson; K.D. Nelson 6Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Search for other works by this author on: GSW Google Scholar K.D. Solon; K.D. Solon 6Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Search for other works by this author on: GSW Google Scholar L.D. Brown; L.D. Brown 7Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853, USA Search for other works by this author on: GSW Google Scholar W. Zhao W. Zhao 8Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China Search for other works by this author on: GSW Google Scholar Author and Article Information J. Mechie 1GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany S.V. Sobolev 2GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany, and Institute of Physics of the Earth, Moscow, Russia L. Ratschbacher 3Institut für Geologie, Technische Universität Freiberg, 09599 Freiberg, Germany A. Y. Babeyko 4GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany G. Bock 4GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany A.G. Jones 5Geological Survey of Canada, Ottawa, Ontario, Canada, and Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA K.D. Nelson 6Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA K.D. Solon 6Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA L.D. Brown 7Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853, USA W. Zhao 8Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China Publisher: Geological Society of America Received: 02 Dec 2003 Revision Received: 29 Mar 2004 Accepted: 01 Apr 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (7): 601–604. https://doi.org/10.1130/G20367.1 Article history Received: 02 Dec 2003 Revision Received: 29 Mar 2004 Accepted: 01 Apr 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation J. Mechie, S.V. Sobolev, L. Ratschbacher, A. Y. Babeyko, G. Bock, A.G. Jones, K.D. Nelson, K.D. Solon, L.D. Brown, W. Zhao; Precise temperature estimation in the Tibetan crust from seismic detection of the α-β quartz transition. Geology 2004;; 32 (7): 601–604. doi: https://doi.org/10.1130/G20367.1 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 In the deep crust, temperature, which is among the key parameters controlling lithospheric dynamics, is inferred by extrapolation from the surface using several assumptions that may fail in regions of active tectonics and fluid migration. In the rare case that temperatures of 700 °C or higher are exceeded in the upper and middle continental crust composed of quartz-rich felsic rocks, the α-β quartz transition (ABQT) will occur, generating a measurable seismic signature and offering the possibility for precisely estimating temperature from the known ABQT phase diagram. Here it is shown that all expected seismic features of the ABQT are met by the boundary between the upper and middle crust below the INDEPTH III profile in central Tibet. This finding implies that a temperature of 700 °C is achieved at a depth of 18 km under the southern Qiangtang block, which agrees with the depth to the top of a high electrical conductivity anomaly, likely representing partially melted crust. To the south in the northern Lhasa block, the ABQT is at 32 km depth, corresponding to a temperature of 800 °C. It thus appears that this seismic boundary representing the ABQT is the result of recent geologic processes rather than being a lithologic boundary. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.