Implication of the Trace Element of Multi‐stage Minerals and Titanite U‐Pb Dating for the Gneisses from Liansan Island, Sulu UHPM belt

IF 3.5 3区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Acta Geologica Sinica ‐ English Edition Pub Date : 2023-08-10 DOI:10.1111/1755-6724.15100

Lihao Song, Yuting Cao, Tian Xie, Yuyao Chen, Yuan Gao, Songjie Wang, Xu-Ping Li

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Abstract

Gneisses with anatectic characteristics from the Liansan Island in Sulu UHPM belt were studied for petrography, titanite U‐Pb dating and mineral geochemistry. Three origins of garnets are distinguished: metamorphic garnet, peritectic garnet and anatectic garnet, which are formed in the stages of the peak metamorphism, retrograded anatexis and melt crystallization, respectively. The euhedral titanite has high content of REE and high Th/U ratios, which is interpreted to be newly formed from an anatectic melt. The LA‐ICP‐MS titanite U‐Pb dating yields 214∼217 Ma ages for the titanite (melt) crystallization. The distribution of trace elements varies in response to the different host minerals at different stages. At the peak metamorphic stage, Y and HREE are mainly hosted by garnet, Ba and Rb are by phengite, Sr, Nb, Ta, Pb, Th, U and LREE are by allanite, and Y, U and HREE are by zircon. During the partial melting, Y, Pb, Th, U and REE are released into melt, which caused dramatic decline of these element content in the retrograded minerals. At last, titanite absorbs mostly of Nb, U, LREE and HREE from the melt. Therefore, different stages of metamorphism have different mineral assemblages which host different trace elements.

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苏鲁UHPM带连三岛片麻岩多阶段矿物微量元素及钛矿U - Pb定年意义

本文对苏鲁UHPM带连三岛的片麻岩进行了岩石学、钛矿U - Pb定年和矿物地球化学研究。石榴石的成因分为变质石榴石、包晶石榴石和隐晶石榴石三种，分别形成于变质峰期、退熔期和熔融结晶期。自面体钛矿具有高REE含量和高Th/U比值的特征，说明该钛矿为渐溶熔体新形成。LA‐ICP‐MS钛矿U‐Pb测年得到214 ~ 217 Ma的钛矿(熔融)结晶。不同寄主矿物在不同阶段对微量元素的分布有不同的响应。在变质峰期，Y、HREE主要由石榴石赋存，Ba、Rb主要由白云石赋存，Sr、Nb、Ta、Pb、Th、U、LREE主要由allanite赋存，Y、U、HREE主要由锆石赋存。在部分熔融过程中，Y、Pb、Th、U和REE被释放到熔体中，导致这些元素的含量急剧下降。最后，钛矿主要从熔体中吸收Nb、U、LREE和HREE。因此，不同阶段的变质作用具有不同的矿物组合，含有不同的微量元素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.