Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31799.1 |
Reappraisal of emplacement models for Himalayan external crystalline nappes: The Jajarkot klippe, western Nepal | |
La Roche, Renaud Soucy1; Godin, Laurent1; Crowley, James L.2 | |
2018-05-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2018 |
卷号 | 130页码:1041-1056 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA |
英文摘要 | Recent mapping in the Jajarkot klippe highlights the presence of the South Tibetan detachment in an external crystalline nappe south of the main Himalayan range and provides structural constraints on the emplacement mechanism of such nappes. The top-to-the-northeast South Tibetan detachment in the Jajarkot klippe separates lower-greenschist-to lower-amphibolite-facies metasedimentary rocks of the Greater Himalayan sequence in the footwall from weakly to nonmetamorphosed siliciclastic and carbonate rocks of the Tethyan sedimentary sequence in the hanging wall. The maximum depositional age of an arenite unit at the base of the Tethyan sedimentary sequence is constrained to the late Cambrian. The temperature of deformation increases structurally upward from similar to 450 degrees C at the base of the klippe to similar to 600 degrees C in the South Tibetan detachment and decreases sharply to 250-300 degrees C in its hanging wall. The existence of the South Tibetan detachment between the Greater Himalayan sequence and the Tethyan sedimentary sequence is only compatible with the one-thrust tectonic model for the emplacement of Himalayan external crystalline nappes. The minimum dip-slip displacement along the South Tibetan detachment is constrained to 160-185 km in western Nepal based on the restoration of this folded structure. The lack of evidence for partial melting in the footwall of the South Tibetan detachment in the Jajarkot klippe implies that the melt-weakened middle crust did not flow as far south as the klippe or that it flowed obliquely or parallel to the orogen on both sides of the klippe. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000432588700018 |
WOS关键词 | ANNAPURNA-DHAULAGIRI HIMALAYA ; CRYSTALLOGRAPHIC PREFERRED ORIENTATIONS ; MAIN CENTRAL THRUST ; C-AXIS FABRICS ; TECTONIC EVOLUTION ; GEOCHRONOLOGICAL EVIDENCE ; DEFORMATION TEMPERATURES ; PLASTIC-DEFORMATION ; METAMORPHIC CORE ; SOUTHERN TIBET |
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/25084 |
专题 | 地球科学 |
作者单位 | 1.Queens Univ, Dept Geol Sci & Geol Engn, Kingston, ON K7L 3N6, Canada; 2.Boise State Univ, Dept Geosci, 1910 Univ Dr, Boise, ID 83725 USA |
推荐引用方式 GB/T 7714 | La Roche, Renaud Soucy,Godin, Laurent,Crowley, James L.. Reappraisal of emplacement models for Himalayan external crystalline nappes: The Jajarkot klippe, western Nepal[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2018,130:1041-1056. |
APA | La Roche, Renaud Soucy,Godin, Laurent,&Crowley, James L..(2018).Reappraisal of emplacement models for Himalayan external crystalline nappes: The Jajarkot klippe, western Nepal.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130,1041-1056. |
MLA | La Roche, Renaud Soucy,et al."Reappraisal of emplacement models for Himalayan external crystalline nappes: The Jajarkot klippe, western Nepal".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130(2018):1041-1056. |
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