中生代a型花岗岩的时空分布和数值模拟揭示了中国东南中生代a型花岗岩的幕式递进式岩石圈伸展

IF 2.5 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Sheng-Di Zhou , Xiao-Lei Wang , De-Hong Du , Benjun Wu , Xisheng Xu , Zeng-Qian Hou
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引用次数: 0

摘要

中国东南太平洋西侧晚中生代构造演化是一个谜,与北美东侧的岩浆作用和成矿作用具有重要的对比意义。然而,在中国东南广阔(>1000 km)的内陆地区,是否存在大规模的长英质岩浆活动及与之相关的WSn多金属成矿作用,一直争论不休。为避免中国东南部高硅花岗岩形成的复杂性,本文重点研究了a型花岗岩,这类花岗岩在岩石成因上普遍没有争议,缺乏全面的研究。本文在综合地球化学和年代学资料的基础上,提出了中国东南部中生代a型花岗岩的时空分布特征。地球动力学数值模拟进一步揭示了中国东南部侏罗系-白垩系a型花岗岩精细的时空分布特征,表明古太平洋板块长期俯冲和幕式回滚导致岩石圈伸展幕式递进。本研究建立了古太平洋板块西部广大内陆地区花岗岩形成与深部地球动力学过程的强相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatiotemporal distribution of Mesozoic A-type granites and numerical modeling reveal episodic and progressive lithospheric extension in SE China
The Late Mesozoic tectonic evolution to the west side of Pacific Ocean in SE China is an enigmatic issue and important to compare with the magmatism and mineralization to the east side in North America. However, it is hotly debated on the distribution of a large scale of felsic magmatism and associated WSn polymetallic mineralization in the wide (>1000 km) inland area of SE China. To avoid the complexity in shaping the high-silica granites in SE China, here we focus on A-type granites that are commonly free of debate in petrogenesis and lack comprehensive research. We present the spatiotemporal distribution of Mesozoic A-type granites in SE China based on a geological map-based compilation of available geochemical and geochronological data. The refined spatiotemporal distribution of the Jurassic-Cretaceous A-type granites in SE China can be further illustrated by numerical modeling of geodynamics, indicating an episodic and progressive lithospheric extension by a long-term subduction and episodic rollback of the Paleo-Pacific Plate. This study builds the strong correlation of granite formation and deep geodynamic processes in the wide inland area to the west of the Paleo-Pacific Plate.
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来源期刊
Lithos
Lithos 地学-地球化学与地球物理
CiteScore
6.80
自引率
11.40%
发文量
286
审稿时长
3.5 months
期刊介绍: Lithos publishes original research papers on the petrology, geochemistry and petrogenesis of igneous and metamorphic rocks. Papers on mineralogy/mineral physics related to petrology and petrogenetic problems are also welcomed.
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