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Tonian and Cryogenian - Early Cambrian sedimentation in NW India: Implications on the transition from Rodinia to Gondwana TEXT SIZE: A A A

The Tonian Punagarh-Sindreth and Cryogenian - early Cambrian Marwar sequences in NW India encompass a geological record that could provide vital information for working out the tectonic evolution of this region and a better understanding of the Rodinia to Gondwana transition. The Tonian Punagarh and Sindreth sub-basins received a dominantly felsic detritus with negligible sorting of heavy minerals and mild to weak chemical weathering conditions. The clastic compositions and geochemical characteristics of the Punagarh and Sindreth groups suggest a back-arc basin setting and the detritus sourced from a volcanic arc and cratonic interior region. The Punagarh basin was proximal to the craton while the Sindreth basin was close to an arc system. In contrast, the Cryogenian - early Cambrian Marwar Supergroup clastic sequence contains mature quartz arenite whose high CIA (77.8-94.8) and low ICV (0.18-1.00) values suggest a strong chemical weathering in the source region and noteworthy physical sorting during transportation and sedimentation. An abundance of quartz grains (87-94%), enrichment of Zr, and detritus predominantly derived from the cratonic basement indicate deposition of Marwar sediments in a tectonically stable basin, temporally coinciding with the Gondwana assembly. Collectively, the similar to 760 Ma active continental margin in NW India, documented by the provenance and tectonic setting of the Punagarh and Sindreth basins, is in agreement with the subduction of the peripherical Rodinia supercontinent during its breakup. On the other hand, the passive continental margin sedimentation in Marwar Supergroup points toward an open sea between NW India and western Gondwana during the Gondwana assembly.

Publication name

 JOURNAL OF ASIAN EARTH SCIENCES, Volume 229, Article Number 105171, DOI 10.1016/j.jseaes.2022.105171, Published MAY 15 2022, Early Access MAR 2022

Author(s)

 Zhang, Jun; Pandit, Manoj K.; Chen, Wei Terry; Wang, Wei

Corresponding author(s) 

 Wang, Wei
 wwz@cug.edu.cn
 China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China

Author(s) from IGCAS   Chen, Wei Terry

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