LA-ICP-MS U-Pb dating and Hf isotopes of detrital zircon grains from siltstone of Danzhou Group in northern Guangxi and their geological significance

KOU Caihua; LIU Yanxue; LI Tingdong; HUANG He; ZHANG Heng

2017 Vol. 36, No. 8

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KOU Caihua, LIU Yanxue, LI Tingdong, HUANG He, ZHANG Heng. LA-ICP-MS U-Pb dating and Hf isotopes of detrital zircon grains from siltstone of Danzhou Group in northern Guangxi and their geological significance[J]. Geological Bulletin of China, 2017, 36(8): 1393-1406.

Citation:

KOU Caihua, LIU Yanxue, LI Tingdong, HUANG He, ZHANG Heng. LA-ICP-MS U-Pb dating and Hf isotopes of detrital zircon grains from siltstone of Danzhou Group in northern Guangxi and their geological significance[J]. Geological Bulletin of China, 2017, 36(8): 1393-1406.

LA-ICP-MS U-Pb dating and Hf isotopes of detrital zircon grains from siltstone of Danzhou Group in northern Guangxi and their geological significance

Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 02 November 2016

Revised Date: 03 February 2017

Publish Date: 25 August 2017

Abstract

Abstract

This paper reports LA-ICP-MS U-Pb dating and Hf isotopes for detrital zircon grains of siltstone from Gongdong For-mation at the top of the Danzhou Group. The majority of zircon grains are transparent, euhedral and prismatic crystals with oscillato-ry zoning in CL images and have high Th/U ratios of 0.2~2.4, indicating an igneous origin for the zircon. The ²⁰⁶Pb/²³⁸Pb age distri-butions for the detrital zircon grains mainly range from 730Ma to 769Ma and 771Ma to 850Ma, and ε_Hf(t)and two-stage Hf model ages (T_DM2) range from -18.4 to 11.4 and from 1020Ma to 2812Ma, respectively. Moreover, there are some detrital zircon grains with relatively older ages with ²⁰⁶Pb/²³⁸Pb ages from 1910Ma to 3140Ma, and ε_Hf(t)and T_DM2 from -13.6~3.4 and 2740~3635Ma, respec-tively. Combined with previous researches, the authors infer that the maximum depositional age of the Gongdong Formation from Danzhou Group is 706±10Ma. The source region was predominated by Neoproterozoic magmatic rocks from Yangtze Block (ca. 750~830Ma) with the mixture of minor Archean magmatic rocks. There was developed the Greenville movement in South China re-sulting from the assembly of Rodinia supercontinent. In addition, on the basis of the ε_Hf(t)and T_DM2 data of the detrital zircon grains, the authors hold the existence of three stages for the crust growth in the study area:① 3.64Ga to 3.25Ga, with the juvenile crust at 3.64Ga; ② 2.98Ga to 2.37Ga; ③ 2.19Ga to 1.28Ga.
- Danzhou Group in northern Guangxi /
- detrital zircon LA-ICP-MS U-Pb dating /
- Hf isotope /
- Rodinia supercontinent /
- crust growth

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