扬子西南缘中-新元古代两期岩浆活动年代学及地质意义

张继彪; 丁孝忠; 刘燕学; 张恒

doi:10.3799/dqkx.2020.034

Volume 45 Issue 7

Jul. 2020

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Article Navigation > Earth Science > 2020 > 45(7): 2452-2468

Zhang Jibiao, Ding Xiaozhong, Liu Yanxue, Zhang Heng, 2020. Geochronology and Geological Implication in Two Episodes of Meso-Neoproterozoic Magmatism in the Southwestern Yangtze Block. Earth Science, 45(7): 2452-2468. doi: 10.3799/dqkx.2020.034

Citation:

Zhang Jibiao, Ding Xiaozhong, Liu Yanxue, Zhang Heng, 2020. Geochronology and Geological Implication in Two Episodes of Meso-Neoproterozoic Magmatism in the Southwestern Yangtze Block. Earth Science, 45(7): 2452-2468. doi: 10.3799/dqkx.2020.034

Citation:

Zhang Jibiao, Ding Xiaozhong, Liu Yanxue, Zhang Heng, 2020. Geochronology and Geological Implication in Two Episodes of Meso-Neoproterozoic Magmatism in the Southwestern Yangtze Block. Earth Science, 45(7): 2452-2468. doi: 10.3799/dqkx.2020.034

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Geochronology and Geological Implication in Two Episodes of Meso-Neoproterozoic Magmatism in the Southwestern Yangtze Block

doi: 10.3799/dqkx.2020.034

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

Received Date: 2020-02-25
Publish Date: 2020-07-15

Abstract

Abstract

Late Mesoproterozoic to Early Neoproterozoic igneous rocks occur in the southwestern Yangtze block, which had a great bearing on the evolution history of the Yangtze block during the late Mesoproterozoic to early Neoproterozoic. This study reports SHRIMP zircon U-Pb ages and geochemistry data for gabbros that intruded in the Yanbian Group, and that of rhyolites from the upper Tianbaoshan Formation of the Huili Group in the southwestern Yangtze block.The rhyolites were dated at 1 011.9±8.9 Ma and the gabbros were formed at 910.6±4.7 Ma. The rhyolites in the Tianbaoshan Formation were characterized by high SiO₂ and K₂O contents and high FeO_t/MgO ratio. The contents of rare earth elements of rhyolites are high(∑REE=292×10^-6-401×10^-6), and characterized by LREE-enriched and HREE-depleted patterns[(La/Yb)_N=1.77-6.74] with typical depletion of Eu(δEu=0.43-0.56), consistent with the geochemical characteristics of A-type granites. The geochemistry indicates that the rhyolites were derived from the partial melting of previous crust and formed in a continental rift setting. The gabbro shave low rare earth elements(∑REE=54×10^-6-98×10^-6) and characterized by slightly LREE-enriched and HREE-depleted patterns with unconspicuous Eu anomaly[(La/Yb)_N=1.46-4.72, δEu=0.81-1.31] and the trace element patterns with typical depletion of Nb-Ta and Ti but no enrichment of Zr-Hf. The gabbros were derived from the subduction-modified lithospheric mantle wedge and formed in an arc setting. In view of the two episodes of magmatism in the study region, we propose that the tectonic properties changed from a continental rift setting to a compression setting in the southwestern Yangtze Block at 1 000-910 Ma.
- southwestern Yangtze block,
- meso–neoproterozoic,
- SHRIMP zircon U-Pb age,
- geochemistry,
- tectonic setting

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References(69)

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