|Title:||Mesoscale fractures as palaeostress indicators: A case study from Cauvery basin|
Srivastava, Deepak C.
|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|
|Author Scopus IDs:||11840393900|
|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: firstname.lastname@example.org|
|Appears in Collections:||Journal Publications [ES]|
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