https://scholars.lib.ntu.edu.tw/handle/123456789/431837
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.author | Chiu Y.-P. | en_US |
dc.contributor.author | Yeh M.-W. | en_US |
dc.contributor.author | Wu K.-H. | en_US |
dc.contributor.author | Lee T.-Y. | en_US |
dc.contributor.author | Lo C.-H. | en_US |
dc.contributor.author | Chung S.-L. | en_US |
dc.contributor.author | SUN-LIN CHUNG | en_US |
dc.contributor.author | CHING-HUA LO | en_US |
dc.creator | Chiu Y.-P.;Yeh M.-W.;Wu K.-H.;Lee T.-Y.;Lo C.-H.;Chung S.-L.;Iizuka Y. | - |
dc.date.accessioned | 2019-11-20T08:40:17Z | - |
dc.date.available | 2019-11-20T08:40:17Z | - |
dc.date.issued | 2018 | - |
dc.identifier.issn | 00167606 | - |
dc.identifier.uri | https://scholars.lib.ntu.edu.tw/handle/123456789/431837 | - |
dc.description.abstract | Two contradictory plate-kinematic models, (1) collision extrusion and (2) mid- to lower-crustal-level flow, have been proposed for inducing crustal deformation surrounding the eastern Tibetan Plateau in response to the Cenozoic collision of India-Eurasia. A hybrid tectonic model indicating extrusion followed by crustal flow is established by new structural, petrological, and geochronological data obtained from the Gaoligong shear zone in western Yunnan, China. The 40Ar/39Ar ages for muscovite (34-31 Ma), biotite (23 Ma), and K-feldspar (33-21 Ma) mineral separates from the Gaoligong group, and a matrix crosscutting quartzofeldspathic dike produce a cooling path. By interlinking the synkinematic metamorphic conditions with the reconstructed cooling path, we find that the temperature dropped from 550 ¢XC around ca. 34 Ma to 350 ¢XC at ca. 32 Ma, and dropped again to 275 ¢XC around ca. 22 Ma. The timing and kinematic mechanism of four ductile deformation events, followed by brittle deformation, is deciphered. The earliest D1 event deformed the Early Cretaceous granite (zircon U-Pb ages of 118-78 Ma), forming WNW-ESE-striking upright folds during the closure of the Neo-Tethyan ocean. The D2 event was associated with large-scale eastward thrusting and folding with top-to-the- N/NE sense of shear under upper-amphibolite- facies conditions between 50 and 35 Ma due to India-Eurasia continent-continent collision. D3 formed moderate NE-dipping, NW-SE-striking, left-lateral shear zones that accommodated the southeastward extrusion of Indochina around 35-28 Ma. The sinistral sense of shear S/C fabrics defined by muscovite folia with foliation-bounded myrmekite indicates that deformation occurred under middle- to lower-amphibolite-facies metamorphic conditions. The 28 Ma to 15 Ma steep N-S-trending, right-lateral Gaoligong shear belt (D4) is the dominant structural feature in this region. Chloritization of biotite and boudinaged sillimanite along S/C2 fabrics indicate that the crystalline rocks retrograded from amphibolite-facies into greenschist- facies conditions. This coincided with clockwise cataclastic flow around the Eastern Himalaya syntaxis due to gravitational collapse after delamination of the thickened Tibetan Plateau. ? 2018 Geological Society of America. | - |
dc.language | English | - |
dc.relation.ispartof | Bulletin of the Geological Society of America | - |
dc.title | Transition from extrusion to flow tectonism around the Eastern Himalaya syntaxis | en_US |
dc.type | journal article | en |
dc.identifier.doi | 10.1130/B31811.1 | - |
dc.identifier.scopus | 2-s2.0-85055656101 | - |
dc.identifier.url | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85055656101&doi=10.1130%2fB31811.1&partnerID=40&md5=f651a7b0991663ca64da54020172073a | - |
dc.relation.pages | 1675-1696 | - |
dc.relation.journalvolume | 130 | - |
dc.relation.journalissue | 9-10 | - |
item.cerifentitytype | Publications | - |
item.fulltext | no fulltext | - |
item.openairecristype | http://purl.org/coar/resource_type/c_6501 | - |
item.openairetype | journal article | - |
item.grantfulltext | none | - |
crisitem.author.dept | Geosciences | - |
crisitem.author.dept | Geosciences | - |
crisitem.author.dept | Office of the Vice President | - |
crisitem.author.orcid | 0000-0002-5362-4496 | - |
crisitem.author.orcid | 0000-0001-8060-8654 | - |
crisitem.author.parentorg | College of Science | - |
crisitem.author.parentorg | College of Science | - |
crisitem.author.parentorg | Administrative Unit | - |
顯示於: | 地質科學系 |
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