Neoproterozoic tectonic evolution of the northern margin of the Yangtze plate: Constraints from magmatic events

被引：0
作者：
Hui B. [1 ]
Dong Y. [1 ]
Sun S. [1 ]
Sun J. [1 ]
Zhang F. [1 ]
He D. [1 ]
Li Y. [1 ]
机构：
[1] Department of Geology, State Key Laboratory of Continental Dynamics, Northwest University, Shaanxi, Xi'an
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2022年 / 96卷 / 09期
关键词：
Huangling complex; magmatism; Neoproterozoic; tectonic evolution; Yangtze plate;
D O I：
10.19762/j.cnki.dizhixuebao.2022250
中图分类号：
学科分类号：
摘要：
The Neoproterozoic intrusive complex in the Huangling area can provide key information for the study of the Neoproterozoic tectonic evolution process and its deep dynamic mechanism in the northern margin of the Yangtze plate. According to the rock assemblage and distribution characteristics, the Huangling complex can be divided into four rock suites as the Huanglingmiao suite, Sandouping suite, Dalaoling suite, and Xiaofeng suite. Based on an integrated study of field geology and petrology, this paper presents new LA- ICP- MS zircon U- Pb geochronological data for the granite gneiss of the Kongling Complex, Huanglingmiao biotite granite, and Sandouping diorite. The results show that the granite gneiss in the Kongling Complex, the surrounding rocks, was formed at 1978±13 Ma, and it also records an earlier tectonic- thermal event at 2.5 Ga. The Huanglingmiao biotite granite and the Sandouping diorite were formed at 815±9 Ma and 813±6 Ma, respectively, which are basically consistent with the emplacement time of the Huanglingmiao and Sandouping suites. These new results, combined with previous published data, suggest that the Huangling complex was mainly formed between 863 Ma and 794 Ma, and was the product of magmatic activity in the early Neoproterozoic. By reviewing regional geological and geochemical research data, it is inferred that the Huangling complex was likely formed in the tectonic setting of an early Neoproterozoic active continental margin. The northern margin of the Yangtze plate might have experienced a long- term subduction- accretionary orogenic process during the early Neoproterozoic. © 2022 Geological Society of China. All rights reserved.
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页码：3034 / 3050
页数：16
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