东特提安喜马拉雅含电气石褐晶岩的地质年代、地球化学和原位 Sr-Nd-Hf 同位素组成:构造背景和稀有金属成矿的影响

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Minerals Pub Date : 2024-07-26 DOI:10.3390/min14080755
Yangchen Drolma, Kaijun Li, Yubin Li, Jinshu Zhang, Chengye Yang, Gen Zhang, Ruoming Li, Duo Liu
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引用次数: 0

摘要

喜马拉雅白云岩是了解印度-亚洲碰撞造山过程的绝佳目标,但其成因和构造意义仍存在争议。研究人员分别利用 LA-ICP-MS、X 射线荧光光谱、ICP-MS 和 LA-MC-ICP-MS 对东德喜马拉雅地区的一块含电气石的白花岗岩进行了地球时学、地球化学和原位 Sr-Nd-Hf 同位素的综合研究。对锆石和独居石进行的 LA-ICP-MS U-Pb 定年显示,该白云母成岩时间约为 19 Ma。白榴石的SiO2和Al2O3含量较高,分别为73.16-73.99 wt.%和15.05-15.24 wt.%。铝饱和指数(1.14-1.19)和铷/锶比率(3.58-6.35)较高,这是 S 型花岗岩的特征。白花岗岩富含轻稀土元素(LREEs,如 La 和 Ce)和大离子亲岩元素(LILEs,如 Rb、K 和 Pb),而贫含重稀土元素(如 Tm、Yb 和 Lu)和高场强元素(HFSEs,如 Nb、Zr 和 Ti)。其特征是I Sr (t) 高(0.7268-0.7281),ε Nd (t) (-14.6--13.2)和ε Hf (t)(-12.6--9.47)低,这与喜马拉雅山系的同位素特征一致。从岩石学角度来看,白云母的成因最好的解释是,在区域延伸过程中,由于藏南脱落系(STDS)的运动,高喜马拉雅层序内的古元古代岩源发生了减压诱发的蕈云母脱水熔融。该白榴石和相关伟晶岩的锂和铍含量极高,表明喜马拉雅白榴石具有巨大的锂和铍勘探潜力。
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Geochronology, Geochemistry, and In Situ Sr-Nd-Hf Isotopic Compositions of a Tourmaline-Bearing Leucogranite in Eastern Tethyan Himalaya: Implications for Tectonic Setting and Rare Metal Mineralization
Himalayan leucogranite is an excellent target for understanding the orogenic process of the India–Asia collision, but its origin and tectonic significance are still under debate. An integrated study of geochronology, geochemistry, and in situ Sr-Nd-Hf isotopes was conducted for a tourmaline-bearing leucogranite in the eastern Tethyan Himalaya using LA-ICP-MS, X-ray fluorescence spectroscopy, and ICP-MS and LA-MC-ICP-MS, respectively. LA-ICP-MS U-Pb dating of zircon and monazite showed that it was emplaced at ~19 Ma. The leucogranite had high SiO2 and Al2O3 contents ranging from 73.16 to 73.99 wt.% and 15.05 to 15.24 wt.%, respectively. It was characterized by a high aluminum saturation index (1.14–1.19) and Rb/Sr ratio (3.58–6.35), which is characteristic of S-type granite. The leucogranite was enriched in light rare-earth elements (LREEs; e.g., La and Ce) and large ion lithophile elements (LILEs; e.g., Rb, K, and Pb) and depleted in heavy rare-earth elements (e.g., Tm, Yb, and Lu) and high field strength elements (HFSEs; e.g., Nb, Zr, and Ti). It was characterized by high I Sr (t) (0.7268–0.7281) and low ε Nd (t) (−14.6 to −13.2) and ε Hf (t) (−12.6 to −9.47), which was consistent with the isotopic characteristics of the Higher Himalayan Sequence. Petrogenetically, the origin of the leucogranite is best explained by the decompression-induced muscovite dehydration melting of an ancient metapelitic source within the Higher Himalayan Sequence during regional extension due to the movement of the South Tibetan Detachment System (STDS). The significantly high lithium and beryllium contents of the leucogranite and associated pegmatite suggest that Himalayan leucogranites possess huge potential for lithium and beryllium exploration.
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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