globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-016-1385-1
Scopus记录号: 2-s2.0-84982315614
论文题名:
Structural analysis of Nalagarh lobe, NW Himalaya: implication of thrusting across tectonic edge of NW limb of Nahan salient, Himachal Pradesh, India
作者: Bhakuni S.S.; Philip G.; Suresh N.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2017
卷: 106, 期:5
起始页码: 1773
结束页码: 1795
语种: 英语
英文关键词: Nahan salient ; Nalagarh lobe ; Northwest Himalaya ; Oblique ramp ; Transverse fault
Scopus关键词: deformation ; displacement ; fault propagation ; fault slip ; fold ; Pleistocene ; structural analysis ; tectonic setting ; thrust fault ; Himachal Pradesh ; Himalayas ; India
英文摘要:

The Main Boundary Fault (MBF), convex towards southwest, forms the leading edge of the Nahan salient. Near the southern end of an oblique ramp, a lobe-shaped physiographic front, named in this work as Nalagarh lobe, has developed across NW limb of salient. The lobe has formed across the MBF that separates the hanging wall Lower Tertiary Dharmsala rocks from the footwall Upper Tertiary Siwalik rocks and overlying Quaternaries. In front of lobe, thrust fault splays (Splay-1 and Splay-2) and associated tectonic fabrics have developed within the Late Pleistocene fan deposit. Structural elements developed across the front of Nalagarh lobe are analysed with reference to evolution of lobe. An unweathered ~15-m-high hanging wall or wedge top forms the uplifted and rejuvenated bedrock fault scarp of the MBF. Below the MBF, the fan deposit has underthrust along Splay-1. Later the Splay-2 formed within fan deposit near south of Splay-1. Geometry of the overturned limb of tight to isoclinal fault propagation fold, formed on Splay-2 plane, suggests that the fold formed by normal drag, produced by intermittent fault-slips along Splay-2. The displacement along Splay-2 offset the marker bed to ~1 m by which some clasts rotated parallel to the traces of brittle axial planes of fold. The variable fold geometry and style of deformation are analysed along length of thrust splays for 5 km. It is revealed that the lobe is bounded by transverse thrust faults along its NW and SE margins. The geometry of salient and oblique ramp suggests that the transverse thrust faults and associated transverse folds formed by right-lateral displacement along the NW limb of the salient. Marking the northern margin of the intermontane piggyback basin of Pinjaur dun, the MBF is interpreted to be an out-of-sequence thrust that has brought up the Lower Tertiary Dharmsala rocks over the Late Pleistocene fan deposit. The geometry of lobe and its bounding transverse faults suggest that faults are intimately associated with the kinematics of the transition between the Nahan salient and Kangra recess. The transition is a transfer zone forming a long pre-Himalayan lineament across which the stratigraphic set of the Tethys and Lesser Himalaya is different. The study suggests that the lateral ramp on the Main Himalayan Thrust does not exist beneath the apex and also beneath the SE limb of the salient in the Sub-Himalayan region. This ramp should be present only beneath near end point of SW limb of the Nahan salient. © 2016, Springer-Verlag Berlin Heidelberg.

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84982315614&doi=10.1007%2fs00531-016-1385-1&partnerID=40&md5=185188a6da50687ba5db42dca931d313
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70014
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: Wadia Institute of Himalayan Geology, Dehradun, India

Recommended Citation:
Bhakuni S.S.,Philip G.,Suresh N.. Structural analysis of Nalagarh lobe, NW Himalaya: implication of thrusting across tectonic edge of NW limb of Nahan salient, Himachal Pradesh, India[J]. International Journal of Earth Sciences,2017-01-01,106(5)
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