The Basement of the Deccan Traps and Its Madagascar Connection: Constraints from Xenoliths

Upadhyay, Dewashish; Kooijman, Ellen; Singh, Ajay K.; Mezger, Klaus; Berndt, Jasper (2015). The Basement of the Deccan Traps and Its Madagascar Connection: Constraints from Xenoliths. Journal of geology, 123(3), pp. 295-307. University of Chicago Press, Journals Division 10.1086/682009

[img]
Preview
Text
682009.pdf - Published Version
Available under License Publisher holds Copyright.

Download (2MB) | Preview

Paleogeographic reconstructions of India and Madagascar before their late Cretaceous rifting juxtapose the Antongil Block of Madagascar against the Deccan Traps of India, indicating that the Western Dharwar Craton extends below the Deccan lavas. Some recent studies have suggested that the South Maharashtra Shear Zone along the northern Konkan coast of India limits the northern extent of the Western Dharwar Craton, implying that the craton does not extend below the Deccan Traps, raising a question mark on paleogeographic reconstructions of India and Madagascar. The continuity of the Western Dharwar Craton north of the South Maharashtra Shear Zone below the Deccan Traps—or its lack thereof—is critical for validating tectonic models correlating Madagascar with India. In this study, zircons in tonalitic basement xenoliths hosted in Deccan Trap dykes were dated in situ, using the U-Pb isotope system. The data furnish U-Pb ages that define three populations at 2527 ± 6, 2456 ± 6, and 2379 ± 9 Ma. The 2527 ± 6 Ma ages correspond to the igneous crystallization of the tonalites, whereas the 2456 ± 6 and 2379 ± 9 Ma ages date metamorphic overprints. The results help to establish for the first time that the basement is a part of the Neoarchean granitoid suite of the Western Dharwar Craton, which extends northward up to at least Talvade in central and Kihim beach in the western Deccan. By implication, the South Maharashtra Shear Zone cannot be the northern limit of the Western Dharwar Craton. The granitoids are correlated with the Neoarchean felsic intrusions (2.57–2.49) of the Masaola suite in the Antongil Block of Madagascar, supporting the existence of a Neoarchean Greater Dharwar Craton comprising the Western Dharwar Craton and the Antongil-Masora Block.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Mezger, Klaus

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0022-1376

Publisher:

University of Chicago Press, Journals Division

Language:

English

Submitter:

Klaus Mezger

Date Deposited:

30 Jul 2015 13:01

Last Modified:

01 Jun 2016 02:30

Publisher DOI:

10.1086/682009

BORIS DOI:

10.7892/boris.70604

URI:

https://boris.unibe.ch/id/eprint/70604

Actions (login required)

Edit item Edit item
Provide Feedback