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Structural evolution of the frontal fold–thrust belt, NW Himalayas from sequential restoration of balanced cross-sections and its hydrocarbon potential

By
Premanand Mishra
Premanand Mishra
Present address: Jubilant Energy, Noida, India
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Dilip K. Mukhopadhyay
Dilip K. Mukhopadhyay
Department of Earth Sciences, Indian Institute of Technology, Roorkee 247667, India
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Published:
January 01, 2012

Abstract

Two sedimentary lithotectonic zones are traditionally recognized in the northwestern Himalayan frontal fold–thrust belt in the Nahan salient: the Lesser Himalaya Zone (LHZ) and the Sub-Himalaya Zone (SHZ). The LHZ is made up of a sequence of Proterozoic to Early Cambrian rocks and the SHZ is made up of Cenozoic rock sequences, which were deposited subsequent to the India–Asia collision. Serial balanced cross-sections show that the structural geometries become increasingly complex from independent ramp anticlines near the foreland through imbricate fan/duplex to stacked-up horses towards the hinterland. Sequential restoration suggests a structural evolution in which a foreland propagating, in-sequence thrusting event was followed by out-of-sequence thrusting in an approximately break-back style. During the out-of-sequence movement, some of the ramps formed during in-sequence thrusting were repeatedly reactivated, leading to very complex structural geometries, particularly in the LHZ. In such a complexly deformed terrain, a rigorous structural modelling approach, combined with a robust geochemical and geochronological database, should be used to carry out calibrated petroleum system modelling, and thus reduce exploration risk.

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Geological Society, London, Special Publications

Geology and Hydrocarbon Potential of Neoproterozoic–Cambrian Basins in Asia

G. M. Bhat
G. M. Bhat
University of Jammu, India
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J. Craig
J. Craig
eni exploration & production, Italy
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J. W. Thurow
J. W. Thurow
University College London, UK
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B. Thusu
B. Thusu
University College London, UK
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A. Cozzi
A. Cozzi
Ieoc, Egypt
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Geological Society of London
Volume
366
ISBN electronic:
9781862396142
Publication date:
January 01, 2012

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