FIRST REPORT OF PAN-AFRICAN SM-ND AND RB-SR MINERAL ISOCHRON AGES FROM REGIONAL CHARNOCKITES OF SOUTHERN INDIA

被引：55
|
作者：
UNNIKRISHNANWARRIER, C [1 ]
SANTOSH, M [1 ]
YOSHIDA, M [1 ]
机构：
[1] CTR EARTH SCI STUDIES,TRIVANDRUM 695031,KERALA,INDIA
来源：
GEOLOGICAL MAGAZINE | 1995年 / 132卷 / 03期
关键词：
D O I：
10.1017/S0016756800013583
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Mineral and whole-rock isotope data for a massive charnockite from Kottaram in the Nagercoil Block at the southern tip of Peninsular India yield Sm-Nd and Rb-Sr ages of 517 +/- 26 Ma and 484 +/- 15 Ma respectively. The Nd model age calculated for the charnockite is c. 2100 Ma. Our study reports the first Pan-African mineral isochron ages from regional charnockites of Peninsular India, which are in good agreement with the recently obtained ages of incipient charnockites in the adjacent blocks, as well as alkaline plutons within the same block. Our results indicate that the Pan-African tectonothermal event in the granulite blocks south of the Palghat-Cauvery shear zone was regional, with terrain-wide rejuvenation. These results correlate with similar Pan-African tectonothermal events reported from Sri Lanka and East Antarctica, and have an important bearing on Gondwana reconstructions.
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页码：253 / 260
页数：8
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