沂水地区麻粒岩变质P-T-t演化:华北克拉通东部地块构造演化新认识

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Ziyuan CHEN, Mingkao YUAN, Zhenyu ZHONG, Tianqi LI, Guodong WANG, Lingling XIAO
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引用次数: 0

摘要

沂水杂岩位于华北克拉通鲁西地区,是华北克拉通太古宙结晶基底的代表,对探索地球早期构造-热演化史具有重要意义。本文详细介绍了宜水杂岩长英质麻粒岩和二辉石麻粒岩的岩石学、矿物化学、变质演化和锆石U-Pb定年,以期对华北克拉通新太古代构造演化有新的认识。麻粒岩样品可识别出顺行(M1)、峰状(M2)和逆行(M3) 3种矿物组合。常规的地温测量和相平衡模拟结果表明,变质峰的P-T条件为6.5 ~ 10.9 kbar/718 ~ 839℃,为中下地壳中压麻粒岩相变质作用。重建了具有近等压冷却(IBC)逆行段的逆时针P-T路径。锆石LA-ICP-MS U-Pb定年表明,长英质麻粒岩原岩位置时间为2541±7 Ma,随后的中压麻粒岩相变质作用发生在2518-2494 Ma。提出了新太古代鲁西地体与地幔柱相关的两期地壳尺度凹陷地球动力学体系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Metamorphic P-T-t Evolution of Granulite in the Yishui Area: New Insights into the Tectonic Evolution of the Eastern Block, North China Craton

Metamorphic P-T-t Evolution of Granulite in the Yishui Area: New Insights into the Tectonic Evolution of the Eastern Block, North China Craton

The Yishui complex, located in the western Shandong area of the North China Craton, is representative of the Archean crystalline basement of the North China Craton to explore the early tectonic-thermal evolution history of the Earth. Detailed petrography, mineral chemistry, metamorphic evolution and zircon U-Pb dating are presented for felsic granulite and two-pyroxene granulite from the Yishui complex to contribute to new insights into the Neoarchean tectonic evolution of the North China Craton. Three mineral assemblages are recognized for these granulite samples, including the prograde (M1), peak (M2) and retrograde (M3) mineral assemblages. Conventional geothermobarometry and phase equilibrium modeling yield P-T conditions of 6.5–10.9 kbar/718–839°C for the peak metamorphism, which define a medium-pressure granulite-facies metamorphism occurred at middle to lower crust. Anticlockwise P-T paths with near-isobaric cooling (IBC) retrograde segments were reconstructed. Zircon LA-ICP-MS U-Pb dating suggests that the protolith of the felsic granulite was emplaced at 2541 ± 7 Ma and the subsequent medium-pressure granulite-facies metamorphism occurred at 2518–2494 Ma. A two-stage mantle plume related crustal-scale sagduction geodynamic regime is proposed in the western Shandong terrane in the Neoarchean.

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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
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