DOI: 10.1007/s00531-014-1021-x
Scopus记录号: 2-s2.0-84906306795
论文题名: Near N-S paleo-extension in the western Deccan region, India: Does it link strike-slip tectonics with India-Seychelles rifting?
作者: Misra A.A. ; Bhattacharya G. ; Mukherjee S. ; Bose N.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 6 起始页码: 1645
结束页码: 1680
语种: 英语
英文关键词: Brittle shear
; Deccan large igneous province
; India-Seychelles rifting
; Paleostress
; Strike-slip fault
Scopus关键词: brittle deformation
; Cretaceous
; Deccan Traps
; deformation mechanism
; large igneous province
; lineament
; Paleocene
; paleostress
; passive margin
; remote sensing
; rifting
; seafloor spreading
; shear zone
; tectonic setting
; India
; Maharashtra
; Seychelles
英文摘要: This is the first detailed report and analyses of deformation from the W part of the Deccan large igneous province (DLIP), Maharashtra, India. This deformation, related to the India-Seychelles rifting during Late Cretaceous-Early Paleocene, was studied, and the paleostress tensors were deduced. Near N-S trending shear zones, lineaments, and faults were already reported without significant detail. An E-W extension was envisaged by the previous workers to explain the India-Seychelles rift at ~64 Ma. The direction of extension, however, does not match with their N-S brittle shear zones and also those faults (sub-vertical, ~NE-SW/~NW-SE, and few ~N-S) we report and emphasize in this work. Slickenside-bearing fault planes, brittle shear zones, and extension fractures in meso-scale enabled us to estimate the paleostress tensors (directions and relative magnitudes). The field study was complemented by remote sensing lineament analyses to map dykes and shear zones. Dykes emplaced along pre-existing ~N-S to ~NE-SW/~NW-SE shears/fractures. This information was used to derive regional paleostress trends. A ~NW-SE/NE-SW minimum compressive stress in the oldest Kalsubai Subgroup and a ~N-S direction for the younger Lonavala, Wai, and Salsette Subgroups were deciphered. Thus, a ~NW/NE to ~N-S extension is put forward that refutes the popular view of E-W India-Seychelles extension. Paleostress analyses indicate that this is an oblique rifted margin. Field criteria suggest only ~NE-SW and ~NW-SE, with some ~N-S strike-slip faults/brittle shear zones. We refer this deformation zone as the "Western Deccan Strike-slip Zone" (WDSZ). The observed deformation was matched with offshore tectonics deciphered mainly from faults interpreted on seismic profiles and from magnetic seafloor spreading anomalies. These geophysical findings too indicate oblique rifting in this part of the W Indian passive margin. We argue that the Seychelles microcontinent separated from India only after much of the DLIP erupted. Further studies of magma-rich passive margins with respect to timing and architecture of deformation and emplacement of volcanics are required. © 2014 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84906306795&doi=10.1007%2fs00531-014-1021-x&partnerID=40&md5=9e638a359d08e7069edefcdcfe868436
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70368
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai, 400 076 Maharashtra, India; Petroleum Exploration, Reliance Industries Limited, Reliance Corporate Park, Navi Mumbai, Mumbai, 400 071 Maharashtra, India
Recommended Citation:
Misra A.A.,Bhattacharya G.,Mukherjee S.,et al. Near N-S paleo-extension in the western Deccan region, India: Does it link strike-slip tectonics with India-Seychelles rifting?[J]. International Journal of Earth Sciences,2014-01-01,103(6)