Paleoproterozoic magmatic and metamorphic events in southwestern Yangtze Block: The position and evolution of the Yangtze Block within the Nuna supercontinent

ZHANG Heng; GAO Linzhi; ZHANG Chuanheng; DING Xiaozhong; LI Tingdong; SONG Biao; LIU Haogang; GONG Chengqiang; ZHANG Jibiao

2019 Vol. 38, No. 11

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ZHANG Heng, GAO Linzhi, ZHANG Chuanheng, DING Xiaozhong, LI Tingdong, SONG Biao, LIU Haogang, GONG Chengqiang, ZHANG Jibiao. Paleoproterozoic magmatic and metamorphic events in southwestern Yangtze Block: The position and evolution of the Yangtze Block within the Nuna supercontinent[J]. Geological Bulletin of China, 2019, 38(11): 1777-1789.

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ZHANG Heng, GAO Linzhi, ZHANG Chuanheng, DING Xiaozhong, LI Tingdong, SONG Biao, LIU Haogang, GONG Chengqiang, ZHANG Jibiao. Paleoproterozoic magmatic and metamorphic events in southwestern Yangtze Block: The position and evolution of the Yangtze Block within the Nuna supercontinent[J]. Geological Bulletin of China, 2019, 38(11): 1777-1789.

Paleoproterozoic magmatic and metamorphic events in southwestern Yangtze Block: The position and evolution of the Yangtze Block within the Nuna supercontinent

1.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
China University of Geosciences, Beijing 100083, China

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Corresponding author: GAO Linzhi, gaolzh@cags.ac.cn

Received Date: 10 January 2019

Revised Date: 13 August 2019

Publish Date: 15 November 2019

Abstract

Abstract

The search for crystalline basement outcrops in the southwestern portion of the Yangtze Block has been the study object of many geologists, and the position and the evolution of the Yangtze Block within the Precambrian supercontinent of Nuna have also been an important research subject. In this study, SHRIMP zircon U-Pb dating was conducted for three granite samples underlying the Kunyang Group and, as a result, the weighted mean ²⁰⁷Pb/²⁰⁶Pb ages of 2347.3±4.9Ma, 2324.3±8.6Ma, and 2329.4±5.9Ma were obtained respectively. These data further confirm that there were 2.32~2.35Ga magmatic events in the southwest Yangtze plate, which were the response of the Yangtze Block to the Arrowsmith orogenic event with the assembly of the Nuna supercontinent. Especially a sample yielded weighted mean ²⁰⁷Pb/²⁰⁶Pb ages of 1909.8±5.7Ma and 1843.1±7.6Ma, which indicate for the first time the existence of two periods of metamorphism respectively at 1.90Ga and 1.84Ga in the southwestern portion of the Yangtze Block. Along with previous researches, the authors have reached the conclusion that there were 2.91~2.84Ga, 2.36~2.32Ga and 2.28~2.19Ga magmatic events and 1.97~1.95Ga, 1.90Ga and 1.84~1.83Ga metamorphic events in the southwest Yangtze Block. These data provide important evidence for ascertaining the position and the evolution of the Yangtze Block within the supercontinent of Nuna.
- Yangtze Block /
- Nuna supercontinent /
- central Yunnan Province /
- crystalline basement

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