DOI: 10.1007/s00531-013-0920-6
Scopus记录号: 2-s2.0-84885930557
论文题名: The role of amphiboles in the metamorphic evolution of the UHP rocks: A case study from the Tso Morari Complex, northwest Himalayas
作者: Singh P. ; Pant N.C. ; Saikia A. ; Kundu A.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 8 起始页码: 2137
结束页码: 2152
语种: 英语
英文关键词: Amphiboles
; Tso Morari Crystalline Complex (TMC)
; Ultra-high-pressure (UHP)
Scopus关键词: amphibole
; crustal evolution
; crystallinity
; eclogite
; garnet
; metamorphism
; P-T conditions
; P-T-t path
; plagioclase
; pseudomorph
; ultrahigh pressure metamorphism
; Himalayas
英文摘要: Amphiboles represent a crucial phase of the ultra-high-pressure (UHP) metamorphic rocks as their solid solution behavior reflects both bulk compositional and P-T changes. Three different types of amphibole have been reported from the UHP metamafic rocks of the Tso Morari Crystalline Complex, NW Himalayas: Na-rich (glaucophane); Na-Ca-rich (barroisite, taramite, winchite) and Ca-rich (tremolite, magnesio-hornblende, pargasite). The Na-amphibole is presented as a core of the zoned amphibole with Na-Ca-rich rim; Na-Ca-amphibole is presented as inclusion in garnets as well as in matrix, and Ca-amphibole is generally found in the matrix. The Na-Ca-amphibole is observed at two different stages of metamorphism. The first is pre-UHP, and the second is post-garnet-omphacite assemblage though with a significant difference in composition. The pressure-temperature estimations of the formation of these two sets of Na-Ca-amphiboles corroborate their textural associations. Ca-rich amphiboles are generally present in the matrix either as symplectite with plagioclase or as a pseudomorph after garnet along with other secondary minerals like chlorite and biotite. Two different types of zoning have been observed in the amphibole grains: (1) core is Na-rich followed by Na-Ca rim and (2) core of Na-Ca-amphibole is followed by Ca-rich rim. The pre-UHP (or the prograde P-T path) and post-UHP stages (or the retrograde P-T path) of Tso Morari eclogites are defined by characteristic amphibole compositions, viz. Na/Na-Ca-amphibole, Na-Ca-amphibole and Ca-amphibole and thus indicate their utility in inferring crustal evolution of this UHP terrain. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885930557&doi=10.1007%2fs00531-013-0920-6&partnerID=40&md5=f5319dd2a9b1191ce3d1bfa44ed9d612
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70491
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Geology, University of Delhi, Delhi, India; Geological Survey of India, Faridabad, India
Recommended Citation:
Singh P.,Pant N.C.,Saikia A.,et al. The role of amphiboles in the metamorphic evolution of the UHP rocks: A case study from the Tso Morari Complex, northwest Himalayas[J]. International Journal of Earth Sciences,2013-01-01,102(8)