Palaeoproterozoic U-PbSHRIMP zircon age from basement rocks in Bangladesh: A possible remnant of the Columbia supercontinent

Journal article

Authors/Editors

Rajesh, Hariharan

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Publication Details

Author list: Hossain I, Tsunogae T, Rajesh HM, Chen B, Arakawa Y

Publisher: French Academy of Sciences

Place: PARIS

Publication year: 2007

Journal: Comptes Rendus Géoscience (1631-0713)

Journal acronym: CR GEOSCI

Volume number: 339

Issue number: 16

Start page: 979

End page: 986

Number of pages: 8

ISSN: 1631-0713

Languages: English-Great Britain (EN-GB)

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Abstract

We present new U-Pb SHRIMP zircon geochronological data for basement rocks in Bangladesh, and discuss the relationship with the formation of the Columbia supercontinent. Euhedral zircons from a diorite sample yield a concordia age of 1730 +/- 11 Ma, which is interpreted as the crystallization age. The Palaeoproterozoic age of the examined basement rock and the common occurrences of similar similar to 1.7-Ga geologic units in the Central Indian Tectonic Zone and Meghalaya-Shillong Plateau in Indian Shield suggest their apparent continuation. This, together with the occurrence of similar similar to 1.7-Ga geologic units in the Albany-Fraser belt in Australia and East Antarctica, are used to suggest that the basement rocks in Bangladesh formed towards the final stages of the assembly of the Columbia supercontinent.

Keywords

Bangladesh, basement rock, Columbia supercontinent, Palaeoproterozoic, U-PbSHRIMP age

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