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Isotopic U-Pb zircon age of volcanic rocks in the Tú Lệ depression

Journal of GEOLOGY, Series B, No.47-48/2018.

Unit 2: Isotopic U-Pb zircon age of volcanic rocks in the Tú Lệ depression

Phạm Đức Lương1, Đặng Trần Huyên2, Nguyễn Đình Hữu2,
Nguyễn Đức Phong2, Nguyễn Thị Bích Thủy3,

1 Vietnam Union of Geological Sciences, No. 6 Pham Ngu Lao, Hanoi
2
Vietnam2Vietnam Institute of Geosciences and Mineral Resources, Km9, Nguyen Trai, Thanh Xuan, Hanoi

3General Department of Geology and Minerals of Vietnam, No. 6 Pham Ngu Lao, Hanoi
Corresponding author: thuynguyendcks@yahoo.com

Received: 23/4/2018

Accepted: 27/7/2018

Abstract:  Based on U-Pb zircon (LA-ICP-MS) analysis zircon U-Pb ages of trachyrhyolite and rhyolite collected in the Tú Lệ Depression, it was determined that the ages range range mainly from 93 to 118 Ma, corresponding to the Early-Late Cretaceous. These results are consistent with almost all published ages. The rhyolite sample with the age of 256 Ma may have genetic relation with Permian felsic rocks in the Sông Đà intracontinental rift. This sample, perhaps, belongs to the basement of the Tú Lệ Depression. The Tú Lệ Depression is an independent structure and was filled mainly with alkaline-subalkaline felsic extrusive rocks, while mafic-ultramafic extrusive rocks are widespread in the Sông Đà intracontinental rift.

Keywords: U-Pb zircon, volcanic rocks, Tú Lệ Depression
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