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Modal data-based simple statistical analysis as an effective petrogenetic indicator: a study from Kadavur gabbro-anorthosite complex, Tamil Nadu, southern India


Affiliations
1 Department of Geology, University of Calcutta, 35, B.C. Road, Kolkata 700 019, India
 

Field and petrographic studies on the Neoproterozoic Kadavur intrusive complex (10°35¢N, 78°11¢E) (located in the Southern Granulite Terrane of the Indian shield) reveal three distinct types: (i) earliest phase of deformed schistose gabbro-anorthosite; (ii) most dominant laye­red gabbro-anorthosite, and (iii) locally developed pegmatoidal gabbro-anorthosite. A simple modal data-based statistical analysis of layered gabbro-anorthosite type yields highly significant or significant correlation coefficients for different mineralogical parameters and strongly supports differentiation from a common magma. Typical dispositions of the mineralogical parameters (as depicted by isopleths patterns) suggest maintenance of a magmatic lineage in varying hydration ambience that developed several petrographic variants within the layered type
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  • Modal data-based simple statistical analysis as an effective petrogenetic indicator: a study from Kadavur gabbro-anorthosite complex, Tamil Nadu, southern India

Abstract Views: 278  |  PDF Views: 129

Authors

Debaleena Sarkar
Department of Geology, University of Calcutta, 35, B.C. Road, Kolkata 700 019, India
Jyotisankar Ray
Department of Geology, University of Calcutta, 35, B.C. Road, Kolkata 700 019, India
Papiya Banerjee
Department of Geology, University of Calcutta, 35, B.C. Road, Kolkata 700 019, India
Suranjana Kayal
Department of Geology, University of Calcutta, 35, B.C. Road, Kolkata 700 019, India

Abstract


Field and petrographic studies on the Neoproterozoic Kadavur intrusive complex (10°35¢N, 78°11¢E) (located in the Southern Granulite Terrane of the Indian shield) reveal three distinct types: (i) earliest phase of deformed schistose gabbro-anorthosite; (ii) most dominant laye­red gabbro-anorthosite, and (iii) locally developed pegmatoidal gabbro-anorthosite. A simple modal data-based statistical analysis of layered gabbro-anorthosite type yields highly significant or significant correlation coefficients for different mineralogical parameters and strongly supports differentiation from a common magma. Typical dispositions of the mineralogical parameters (as depicted by isopleths patterns) suggest maintenance of a magmatic lineage in varying hydration ambience that developed several petrographic variants within the layered type

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DOI: https://doi.org/10.18520/cs%2Fv123%2Fi4%2F601-605