Nyainqentanglha shear zone: A late Miocene extensional detachment in the southern Tibetan Plateau
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Research Article| September 01, 1992 Nyainqentanglha shear zone: A late Miocene extensional detachment in the southern Tibetan Plateau Y. Pan; Y. Pan 1Department of Geological Sciences, State University of New York, Albany, New York 12222 Search for other works by this author on: GSW Google Scholar W.S.F. Kidd W.S.F. Kidd 1Department of Geological Sciences, State University of New York, Albany, New York 12222 Search for other works by this author on: GSW Google Scholar Author and Article Information Y. Pan 1Department of Geological Sciences, State University of New York, Albany, New York 12222 W.S.F. Kidd 1Department of Geological Sciences, State University of New York, Albany, New York 12222 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1992) 20 (9): 775–778. https://doi.org/10.1130/0091-7613(1992)020<0775:NSZALM>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 Email Permissions Search Site Citation Y. Pan, W.S.F. Kidd; Nyainqentanglha shear zone: A late Miocene extensional detachment in the southern Tibetan Plateau. Geology 1992;; 20 (9): 775–778. doi: https://doi.org/10.1130/0091-7613(1992)020<0775:NSZALM>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 A major low-angle ductile shear zone containing S-C mylonites involves metamorphosed granitic rocks at the southeastern edge of the Nyainqentanglha mountain range, southern Tibet. Prominent triangular facet geomorphology is developed by valley erosion of the detachment surface, defined by the top of the southeast-dipping mylonitec shear zone. Kinematic criteria consistently indicate a top-to-southeast sense of shear. The ductile shearing deformation is inferred, from isotopic cooling ages, to have occurred during the interval 11-5 Ma (late Miocene). We interpret the shear zone as a regional extensional detachment; its development indicates when the extensional tectonics in this area started, which in turn may mark the time when the maximum sustainable surface elevation, and perhaps crustal thickness, was reached in southern Tibet. 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.The immense and towering Tibetan Plateau acts as a heating source and, thus, deeply shapes the climate of the Eurasian continent and even the whole world. However, due to the scarcity of meteorological observation stations and very limited climatic data, little is quantitatively known about the heating effect of the plateau and its implications. This paper firstly collects climate data (2001–2007) from 109 observation stations and MODIS-based estimated monthly mean temperature data in the plateau and the neighboring Sichuan Basin, and conducts correlation and simple linear regression to reveal the altitudinal pattern of temperature. Then, according to the linear relationships of temperature and altitude for each month, it compares air temperature differences on the same elevation between the main plateau and surrounding mountains and the Sichuan Basin so as to quantify the heating effect and discuss its implication on timberline of the plateau. The results show that: 1) the heating effect of the plateau is significant. The temperature of the main plateau area was higher than that of free air on the same elevation above the neighboring areas; on the elevation of 4500 m (the main plateau), temperature is 1–6°C higher in the main Plateau than over the Sichuan Basin for different months and 5.9–10.7°C higher than in the Qilian Mountains in the northeastern corner of the plateau. 2) Even at altitudes of 5000–6000 m in the main Plateau, there are 4 months with a mean temperature above 0°C. The mean temperature of the warmest month (July) can reach 10°C at about 4600–4700 m. This may help explain why the highest timberline in the northern hemisphere is on the southeastern Tibetan Plateau.
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It is known that there are sparse weather stations on the Tibetan Plateau,and the lack of real soil temperature data affects the understanding of surface thermodynamic structure over the Plateau.Clear sky T BB data are employed,and the verified clear sky T BB data in 1998 from May to August through variational techniques by real soil temperature can capture the distribution features of mean soil temperature of the Plateau.It turns out to be a kind of important data source to the central and western Plateau,and plays an important role in the Plateau underlying thermodynamic structure study.
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Research Article| February 01, 1988 Hercynian crustal-scale extensional shear zone in the Pyrenees Bas van den Eeckhout; Bas van den Eeckhout 1Institute for Earth Sciences, State University of Utrecht, Budapestlaan 4, 3584 CD Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar Hendrik J. Zwart Hendrik J. Zwart 1Institute for Earth Sciences, State University of Utrecht, Budapestlaan 4, 3584 CD Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar Author and Article Information Bas van den Eeckhout 1Institute for Earth Sciences, State University of Utrecht, Budapestlaan 4, 3584 CD Utrecht, Netherlands Hendrik J. Zwart 1Institute for Earth Sciences, State University of Utrecht, Budapestlaan 4, 3584 CD Utrecht, Netherlands Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1988) 16 (2): 135–138. https://doi.org/10.1130/0091-7613(1988)016<0135:HCSESZ>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 Email Permissions Search Site Citation Bas van den Eeckhout, Hendrik J. Zwart; Hercynian crustal-scale extensional shear zone in the Pyrenees. Geology 1988;; 16 (2): 135–138. doi: https://doi.org/10.1130/0091-7613(1988)016<0135:HCSESZ>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 Detailed structural analysis of metasedimentary rocks and gneisses in the Hospitalet massif (Pyrenees) has revealed that upright structures in low-grade rocks are in a structurally higher position and older than gently inclined to flat-lying structures in higher grade rocks. The steep structures were (sub)vertically flattened during formation of the flat-lying structures, indicating that the higher grade rocks formed as part of a shear-zone system. A similar conclusion can be drawn from the relation between deformation and metamorphism in the higher grade rocks. We suggest that the shear zone may have accommodated crustal extension. 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.
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