Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31811.1 |
Transition from extrusion to flow tectonism around the Eastern Himalaya syntaxis | |
Chiu, Yu-Ping1; Yeh, Meng-Wan1,2; Wu, Kuang-Hsuan1; Lee, Tung-Yi1; Lo, Ching-Hua3; Chung, Sun-Lin3; Iizuka, Yoshiyuki4 | |
2018-09-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2018 |
卷号 | 130页码:1675-1696 |
文章类型 | Article |
语种 | 英语 |
国家 | Taiwan |
英文摘要 | 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 Ar-40/Ar-39 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 degrees C around ca. 34 Ma to 350 degrees C at ca. 32 Ma, and dropped again to 275 degrees C around ca. 22 Ma. The timing and kinematic mechanism of four ductile deformation events, followed by brittle deformation, is deciphered. The earliest D-1 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 D-2 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. D-3 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 (D-4) is the dominant structural feature in this region. Chloritization of biotite and boudinaged sillimanite along S/C-2 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. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000443133000015 |
WOS关键词 | RIVER SHEAR ZONE ; ZIRCON U-PB ; FOLD-THRUST BELT ; TIBETAN PLATEAU ; WESTERN YUNNAN ; CRUSTAL DEFORMATION ; SOUTHERN TIBET ; FAULT ZONE ; AR-40/AR-39 GEOCHRONOLOGY ; EXTENSIONAL COLLAPSE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24684 |
专题 | 地球科学 |
作者单位 | 1.Natl Taiwan Normal Univ, Dept Earth Sci, Taipei, Taiwan; 2.Natl Taiwan Normal Univ, Ctr Gen Educ, Taipei, Taiwan; 3.Natl Taiwan Univ, Dept Geosci, Taipei, Taiwan; 4.Acad Sinica, Inst Earth Sci, Taipei, Taiwan |
推荐引用方式 GB/T 7714 | Chiu, Yu-Ping,Yeh, Meng-Wan,Wu, Kuang-Hsuan,et al. Transition from extrusion to flow tectonism around the Eastern Himalaya syntaxis[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2018,130:1675-1696. |
APA | Chiu, Yu-Ping.,Yeh, Meng-Wan.,Wu, Kuang-Hsuan.,Lee, Tung-Yi.,Lo, Ching-Hua.,...&Iizuka, Yoshiyuki.(2018).Transition from extrusion to flow tectonism around the Eastern Himalaya syntaxis.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130,1675-1696. |
MLA | Chiu, Yu-Ping,et al."Transition from extrusion to flow tectonism around the Eastern Himalaya syntaxis".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130(2018):1675-1696. |
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