中国天山锦石地区石炭纪-二叠纪花岗岩的岩石成因:南天山洋的俯冲和闭合引发的地球动力演化的启示

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Minerals Pub Date : 2024-08-11 DOI:10.3390/min14080811
Wenbin Kang, Kai Weng, Kai Cao, Xiaojian Zhao, Yongwei Gao
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引用次数: 0

摘要

晚石炭世-早二叠世花岗岩广泛分布于天山地区,关于它们的构造背景一直存在争议。我们的研究提供了库米石地区具有代表性的单斜侵入体和花岗岩侵入体的全新全岩地球化学和铅同位素数据,以及锆石U-Pb年龄和Hf同位素数据。目的是破译它们的岩浆来源,并阐明其地球动力演化过程。锆石U-Pb定年结果显示,中天山带的黑云母单斜岩形成于312.7±2.9Ma,而南天山带的石英单斜岩和花岗岩则分别形成于284.5±2.4Ma和283.4±3.9Ma。生物橄榄岩一般具有金属铝质和高K钙碱性特征。它们具有正的εHf(t)值(+4.9-+14.1),富含 LREEs 和 LILEs,但贫乏 HREEs 和 HFSEs。这些特征表明,它们来自下地壳的混合岩浆源和俯冲带上方地幔楔的输入成分。石英闪长岩和正长花岗岩为高K钙碱性至霰石质I型花岗岩,εHf(t)值分别为+14.9-+15.5和+6.6-+14.9。它们富含 LREEs,但贫乏 HFSEs(如 Nb、Ta 和 Ti),显示出相对平缓的 HREE 模式和负 Eu 异常。这些岩石的成因可归结为地幔岩浆参与了下地壳的部分熔融,而在碰撞后延伸的地球动力环境中,上涌的星体层引发了这一熔融。这些花岗岩以及对研究区域内其他岩浆活动的区域分析表明,熊石地区经历了从晚石炭世到早二叠世的从俯冲到后碰撞的演变过程,这制约了古亚洲洋在当地的闭合。
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Petrogenesis of Carboniferous-Permian Granitoids in the Kumishi Area of Tianshan, China: Insights into the Geodynamic Evolution Triggered by Subduction and Closure of the South Tianshan Ocean
Late Carboniferous–Early Permian granitoids are widespread in the Tianshan area and their tectonic setting is controversially discussed. Our research presents fresh whole-rock geochemical and Pb isotopic data, along with zircon U-Pb ages and Hf isotopic data for representative monzonitic and granitic intrusions in the Kumishi area. The aim is to decipher their magma sources and illuminate their geodynamic evolution. Zircon U-Pb dating results reveal that biotite monzonites in the Central Tianshan Belt were emplaced at 312.7 ± 2.9 Ma, while the quartz-monzonites and syenogranites in the South Tianshan Belt were formed at 284.5 ± 2.4 Ma and 283.4 ± 3.9 Ma, respectively. The biotite monzonites generally exhibit metaluminous and high-K calc-alkaline characteristics. They have a positive εHf(t) value (+4.9–+14.1), and are enriched in LREEs and LILEs but depleted in HREEs and HFSEs. These characteristics indicate that they were derived from a mixed magma source of the lower crust and the input of components derived from the mantle wedge above the subduction zone. The quartz-monzonites and syenogranites are high-K calc-alkaline to shoshonitic I-type granites, with εHf(t) values of +14.9–+15.5 and +6.6–+14.9, respectively. They are enriched in LREEs but depleted in HFSEs (e.g., Nb, Ta, and Ti), displaying relatively flat HREE patterns and negative Eu anomalies. The genesis of these rocks is attributed to a partial melting of the lower crust in which mantle-derived magmas participated, which was triggered by an upwelling asthenosphere in a post-collisional extensional geodynamic setting. These granitoids, together with regional analysis of other magmatism in the study area, suggest that the Kumishi area has experienced an evolution from subduction to post-collision from the Late Carboniferous to the Early Permian, which constrains the local closure of the Paleo-Asian Ocean.
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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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