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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/6061
Title: Mesoscale fractures as palaeostress indicators: A case study from Cauvery basin
Authors: Shah J.
Srivastava D.C.
Pandian M.S.
Sarkar S.
Choudhari M.
Subramanian V.
Published in: Journal of the Geological Society of India
Abstract: This paper presents the results of field studies, and palaeostress analyses of the mesoscale fractures and veins in Cauvery basin. It shows that different sedimentary sequences (119-64 Ma) are cut by tensile structures that belong to two successive phases of post-Palaeocene brittle tectonics: (i) an early phase during which bedding parallel fractures and veins were developed due to horizontally directed maximum compression and vertical extension, and (ii) a late phase of hydraulic fracturing in a tectonic regime of vertically directed maximum compression. Dynamic analyses imply triaxial and axial compression deviatoric states of palaeostress during first and second phases of fracturing, respectively. Very high pore-fluid pressure and low differential stress, during the second phase of fracturing, resulted into hydraulic brecciation as a consequence of simultaneous extension in different orientations. We suggest that the development of the mesoscale extensional (mode 1) fractures in Cauvery basin is due to reactivation of large-scale normal faults in the basement rocks. © Geol. Soc. India.
Citation: Journal of the Geological Society of India (2007), 70(4): 571-583
URI: http://repository.iitr.ac.in/handle/123456789/6061
Issue Date: 2007
Keywords: Cauvery basin
Extensional fracturing
Hydraulic fracturing
Pore-fluid pressure
Tamil Nadu
ISSN: 167622
Author Scopus IDs: 11840393900
7203029419
7005914914
57212868412
23479435600
56251161400
Author Affiliations: Shah, J., Department of Earth Sciences, IIT Roorkee, Roorkee - 247 667, India
Srivastava, D.C., Department of Earth Sciences, IIT Roorkee, Roorkee - 247 667, India
Pandian, M.S., Department of Earth Sciences, Pondicherry University, Pondicherry - 605 014, India
Sarkar, S., Reliance Industries Ltd., Navi Mumbai - 470 110, India
Choudhari, M., Reliance Industries Ltd., Navi Mumbai - 470 110, India
Subramanian, V., Department of Geology, National College, Tiruchirapalli - 620 001, India
Corresponding Author: Shah, J.; Department of Earth Sciences, IIT Roorkee, Roorkee - 247 667, India; email: dpkesfes@iitr.ernet.in
Appears in Collections:Journal Publications [ES]

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