Reassembly of the Dharwar and Bastar cratons at ca. 1 Ga: Evidence from multiple tectonothermal events along the Karimnagar granulite belt and Khammam schist belt, southern India

Journal of earth system science

Sojen Joy^1¹  Asru K Choudhury^2²  Gautam K Deb^3³  Gert Van Der Linde^1⁴ 

[1] De Beers Group Services, Exploration, Southdale, P/Bag X01, Johannesburg 2135, South Africa.^1;Department of Geology, Presidency University, Calcutta 700 073, India.^3;Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa.^4;Indian Statistical Institute, Calcutta, India.^2

关键词: U–Pb Zircon geochronology;    Indian craton assembly and rifting;    Rodinia;    Columbia;    P–G valley;    Eastern Ghats Mobile Belt;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The northern part of the Nellore–Khammam schist belt and the Karimnagar granulite belt, which are juxtaposed at high angle to each other have unique U–Pb zircon age records suggesting distinctive tectonothermal histories. Plate accretion and rifting in the eastern part of the Dharwar craton and between the Dharwar and Bastar craton indicate multiple and complex events from 2600 to 500 Ma. The Khammam schist belt, the Dharwar and the Bastar craton were joined together by the end of the Archaean. The Khammam schist belt had experienced additional tectonic events at ∼1900 and ∼1600 Ma. The Dharwar and Bastar cratons separated during development of the Pranhita–Godavari (P–G) valley basin at ∼1600 Ma, potentially linked to the breakup of the Columbia supercontinentand were reassembled during the Mesoproterozoic at about 1000 Ma. This amalgamation process in southern India could be associated with the formation of the Rodinia supercontinent. The Khammam schist belt and the Eastern Ghats mobile belt also show evidence for accretionary processes at around 500 Ma, which is interpreted as a record of Pan-African collisions during the Gondwanaassembly. From then on, southern India, as is known today, formed an integral part of the Indian continent.

【 授权许可】

CC BY