Palaeoproterozoic U–Pb SHRIMP zircon age from basement rocks in Bangladesh: A possible remnant of the Columbia supercontinent |
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| Authors: | Ismail Hossain Toshiaki Tsunogae Hariharan M Rajesh Bin Chen Yoji Arakawa |
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| Institution: | aGraduate School of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba, Ibaraki 305-8572, Japan;bDepartment of Geology and Mining, University of Rajshahi, Rajshahi 6205, Bangladesh;cDepartment of Geology, University of Johannesburg, P.O. Box 524, Auckland Park 2006, Johannesburg, South Africa;dSchool of Earth and Space Sciences, Peking University, Beijing, 100871, China |
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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  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 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. |
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| Keywords: | U– Pb SHRIMP age Basement rock Palaeoproterozoic Bangladesh Columbia supercontinentMots clé s: Â ge U– Pb SHRIMP Socle Palé oproté rozoï que Bangladesh Supercontinent Columbia |
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