DOI: 10.1007/s00531-013-0915-3
Scopus记录号: 2-s2.0-84884413672
论文题名: Bimodal stable isotope signatures of Zildat Ophiolitic Mélange, Indus Suture Zone, Himalaya: Implications for emplacement of an ophiolitic mélange in a convergent setup
作者: Sen K. ; Das S. ; Mukherjee B.K. ; Sen K.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2013
卷: 102, 期: 7 起始页码: 2033
结束页码: 2042
语种: 英语
英文关键词: Carbonate
; Fluid inclusion
; Himalaya
; Mélange
; Stable isotope
Scopus关键词: carbon isotope
; convergent margin
; deformation mechanism
; emplacement
; fluid inclusion
; igneous geochemistry
; lithology
; melange
; metasedimentary rock
; microstructure
; ophiolite
; oxygen isotope
; petrography
; stable isotope
; suture zone
; Indus-Yarlung Suture Zone
英文摘要: Zildat Ophiolitic Mélange (ZOM) of the Indus Suture Zone, Himalaya, represents tectonic blocks of the fragmented oceanic metasediments and ophiolite remnants. The ZOM is sandwiched between the Zildat fault adjacent to a gneissic dome known as Tso Morari Crystalline (TMC) and thin sliver of an ophiolite called as the Nidar Ophiolitic Complex. The ZOM contain chaotic low-density lithologies of metamorphosed oceanic sediments and hydrated mantle rocks, in which carbonates are present as mega-clasts ranging from 100 meters to few centimeters in size. In this work, calcite microstructures, fluid inclusion petrography and stable isotope analyses of carbonates were carried out to envisage the emplacement history of the ZOM. Calcite microstructure varies with decreasing temperature and increasing intensity of deformation. Intense shearing is seen at the marginal part of the mélange near Zildat fault. These observations are consistent with the mélange as a tectonically dismembered block, formed at a plate boundary in convergent setup. The δ18O and δ13C isotope values of carbonates show bimodal nature from deeper (interior) to the shallower (marginal, near the Zildat fault) part of the mélange. Carbonate blocks from deeper part of the mélange reflect marine isotopic signature with limited fluid-rock interaction, which later on provide a mixing zone of oceanic metasediments and/or hydrated ultramafic rocks. Carbonates at shallower depths of the mélange show dominance of syn-deformation hydrous fluids, and this has later been modified by metamorphism of the adjacent TMC gneisses. Above observations reveal that the mélange was emplaced over the subducting Indian plate and later on synchronously deformed with the TMC gneissic dome. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884413672&doi=10.1007%2fs00531-013-0915-3&partnerID=40&md5=87628a305993ceb605739a40d9a6b2aa
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70519
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: Wadia Institute of Himalayan Geology, 33 GMS Road, Dehra Dun, 248 001, India
Recommended Citation:
Sen K.,Das S.,Mukherjee B.K.,et al. Bimodal stable isotope signatures of Zildat Ophiolitic Mélange, Indus Suture Zone, Himalaya: Implications for emplacement of an ophiolitic mélange in a convergent setup[J]. International Journal of Earth Sciences,2013-01-01,102(7)