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Sharma, Kamal K.
- A Record of Ductile Syn-Intrusional Fabrics to Post Solidification Cataclasis: Magnetic Fabric Analysis of Neoproterozoic Mirpur and Mt. Abu Granitoids, NW India
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Authors
Affiliations
1 Geozentrum Nordbayern, Universitat Erlangen-Nuernberg, Schlossgarten 5, D-91054 Erlangen, DE
2 Department of Geology, University of Rajasthan, Jaipur - 302004, IN
3 Department of Geology, Government Postgraduate College, Sirohi - 307001, IN
1 Geozentrum Nordbayern, Universitat Erlangen-Nuernberg, Schlossgarten 5, D-91054 Erlangen, DE
2 Department of Geology, University of Rajasthan, Jaipur - 302004, IN
3 Department of Geology, Government Postgraduate College, Sirohi - 307001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No Spl Iss 1 (2010), Pagination: 239-253Abstract
The Mirpur granite body represents a relatively small (10 km2) pluton intruded along the northern margin of the adjacent Mt. Abu batholith (∼125 km2) in NW India. It is a visibly undeformed alkali feldspar rich pink granite; in contrast, the Mt. Abu is a composite granitoid body and variably deformed. Both are intruded by rhyolitic dykes and the terminal magmatic events in both the cases are mafic dykes. The AMS (Anisotropy of Magnetic Susceptibility) data identify the Mt. Abu with SE-dipping foliations and subvertical lineations as a single structural domain while the Mirpur granite body shows two domains characterized by predominantly E - W trend of magnetic foliation in the eastern part (domain I) and N - S orientations in the western part (domain II). The domain I shows magmatic fabrics, typical for the peraluminous granites of Malani Igneous Suite (MIS). Change in fabric orientation in the domain II has resulted from cataclasis wherein the samples show destruction of the original E - W fabric and complete transposition by N - S trends. The foliations in the Mt. Abu granites have been related to SE orientation of maximum horizontal stress. The same maximum stress direction can be inferred from dyke orientation in the Mirpur granite, which is interpreted as continuation of the tectonic imprint in this region during emplacement of both the granites. Age of the cataclastic overprint with a predominant N - S orientation is not yet constrained but corresponds with the trend of the nearby Sindreth basin within the Malani Igneous Suite. The Neoproterozoic tectonic scenario for the region has been interpreted in terms of an ongoing crustal convergence and granitic magma emplacement against the back stop offered by the rigid Delhi Fold Belt.Keywords
Anisotropy of Magnetic Susceptibility, Cataclasis, Mirpur Granite, Mt. Abu, NW India.
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