Deformation in the Aravalli Supergroup, Aravalli-Delhi Mobile Belt, NW India and Tectonic Significance

Hahn G, Kodl G, de Wall H, Schulz B, Bestmann M, Chauhan NK (2020)

Publication Type: Book chapter / Article in edited volumes

Publication year: 2020

Publisher: Springer

Edited Volumes: Structural Geometry of Mobile Belts of the Indian Subcontinent

Series: Society of Earth Scientists Series

City/Town: Cham

Pages Range: 23-55

ISBN: 978-3-030-40593-9

DOI: 10.1007/978-3-030-40593-9_2

Abstract

Sediments of the Aravalli Supergroup have acquired a complex superposed fold pattern during Neoproterozoic amalgamation (Grenvillian Orogeny) of north Indian blocks (Marwar block, Bundelkhand craton, North Delhi crustal block) and collision with the Central Indian Craton. The Upper Aravalli metasediments reveal a prograde mono-metamorphic history with continuous increase in metamorphic conditions towards the Delhi Supergroup contact. The transition from phyllites to garnet-bearing mica schist is accompanied by strain increase seen in tightening of F2 folds. Microstructures and deformationmechanism in quartz document an increasing temperature gradient from similar to 280 to 500 degrees C towards the Aravalli-Delhi contact. Garnets, grown prior to the contact-parallel, pervasive second cleavage indicate crystallisation along a prograde P-T-path from 400 degrees C/4 kbar to 500 degrees C/7 kbar. Older metamorphic records in the northern Aravalli-Delhi mobile belt sector (e.g. Sandmata Complex, Mangalwar Complex, and North Delhi Terrane) cannot be related with deformation and metamorphism in the Aravalli Supergroup. Considering the pattern of bivergent thrusts with the Neoproterozoic active continental margin along the western side of the Delhi Fold Belt, the lack of any magmatic signature and the inferred contractional fold and thrust deformation along the eastern proximity can be interpreted as a retro-wedge setting.

Authors with CRIS profile

Georg Kodl Lehrstuhl für Mineralogie Helga de Wall Professur für Tektonik Michael Bestmann Professur für Tektonik

Involved external institutions

Mohanlal Sukhadia University / University of Udaipur IN India (IN) Technische Universität Bergakademie Freiberg DE Germany (DE)

How to cite

APA:

Hahn, G., Kodl, G., de Wall, H., Schulz, B., Bestmann, M., & Chauhan, N.K. (2020). Deformation in the Aravalli Supergroup, Aravalli-Delhi Mobile Belt, NW India and Tectonic Significance. In Tapas Kumar Biswal, Sumit Kumar Ray, Bernhard Grasemann (Eds.), Structural Geometry of Mobile Belts of the Indian Subcontinent. (pp. 23-55). Cham: Springer.

MLA:

Hahn, Gregor, et al. "Deformation in the Aravalli Supergroup, Aravalli-Delhi Mobile Belt, NW India and Tectonic Significance." Structural Geometry of Mobile Belts of the Indian Subcontinent. Ed. Tapas Kumar Biswal, Sumit Kumar Ray, Bernhard Grasemann, Cham: Springer, 2020. 23-55.

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