2007 GSA Denver Annual Meeting (28–31 October 2007)

Paper No. 9
Presentation Time: 4:00 PM

INDIA'S PLACE IN THE PROTEROZOIC WORLD: CONSTRAINTS FROM THE LARGE IGNEOUS PROVINCE [LIP] RECORD


ERNST, Richard E., Ernst Geosciences (and Dept. Earth Sci., Carleton Univ., Ottawa), 43 Margrave Ave, Ottawa, ON K1T 3Y2, Canada and SRIVASTAVA, Rajesh K., Banaras Hindu University, Varanasi, 221 005, India, Richard.Ernst@ErnstGeosciences.com

The Large Igneous Province (LIP) record is a key tool for paleocontinental reconstruction {2, 6}. We herein consider the record of LIPs & LIP-fragments from India (based mainly on dykes & from the Dharwar craton, except where noted): 2367 Ma (U-Pb) {10, 8}; 2180 Ma (U-Pb) {15, 8} & also possibly in Bundelkhand craton {18}; 1880 Ma {4, 1} & also in Bastar craton {9}; ca. 1600 Ma volcanics in Singhbhum craton (e.g. {16}); ca. 1490 Ma {4}; ca. 1350 Ma in E. Ghats {13}; ca. 1370 & 1330 Ma {4}; ca. 1200 Ma {4, 17}; ca. 1100 Ma kimberlites {12}; 930 & 790 Ma (U-Pb) anorthosites in E. Ghats {11}; and 770-755 Ma (U-Pb) volcanics in Aravalli craton {19}. Comparison with Other Blocks {6, 5, 7, 20}: The 2367 Ma event is so-far unique, and any other block found with this age must have been a nearest neighbor. The major 2180 Ma event can potentially be matched with events on Superior {3}, Slave {3}, or West Africa cratons {5}. 1880 Ma magmatism is found on many other blocks (e.g. Superior, Slave, Wyoming & Kalahari) and perhaps more than one 1880 Ma centre is implied. Mesoproterozoic events at ca. 1600, 1490, 1350, 1200 & 1100 Ma show most similarities to Australia, but there are matches with Laurentia & Kalahari. The Neoproterozoic events can be linked to Rodinia breakup {14, 7}. Additional precise U-Pb & Ar-Ar dating (& coordinated paleomagnetism) are needed to definitively determine India's place in the Proterozoic world. REFS.: {1} Anand et al. 2003 J. Petrol 44: 2139. {2} Bleeker & Ernst 2006 in: Hanski et al. (eds.) Taylor & Francis, London. {3} Buchan & Ernst 2004 Geol. Surv. Can. Map 2022A. {4} Chatterjee & Bhattacharji 2001, Proc. Indian Acad Sci (EPS) 110: 433. {5} Ernst & Buchan 2001 In: GSA SP 352: 483. {6} Ernst & Bleeker 2007 {abstr} www.NUNA2007.ca. {7} Ernst et al. 2007 Prec. Res (in press). {8} French et al. 2004 GSA Abstr 36: 340. {9} French et al. 2004 GCA, 68 Supl 1: A586. {10} Halls et al. 2007 Pre. Res 155: 47. {11} Krause et al. 2001 Prec. Res 109: 25. {12} Kumar et al 2007 Prec. Res 154: 192. {13} Kumar et al 2007 Lithos (in press). {14} Li et al. 2007 Prec. Res (in press). {15} Pandey et al. 1997 Prec. Res 84: 181. {16} Patranabis-Deb et al. 2007 J. Geol. 115: 407. {17} Pradhan et al. 2007 {abstr} GSA ann mtg. {18} Rao 2004 Gond. Res. 7: 1219. {19} Torsvik et al. 2001 Prec. Res 108: 319. {20} www.largeigneousprovinces.org.