板岩出露过程中的多级岩浆作用驱动大陆地壳的地球化学演化:中国西部南阿尔金山古生代花岗岩的启示

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Long Tian, Liang Liu, Danling Chen, Yuting Cao, Yongsheng Gai, Tuo Ma, Qian Wang, Lei Kang
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引用次数: 0

摘要

目前大陆地壳的特点是上层地壳为熔岩地壳,下层地壳为岩浆岩地壳,这是地质年代地球化学分化的结果。虽然人们提出了各种过程来解释这种分异,但俯冲带仍然是了解大陆地壳成分演变的关键区域。本研究的重点是中国西部的南阿尔金山大陆俯冲碰撞带,这是一个经历了超深(>300 千米)大陆俯冲之后又经历了多级隆升的独特区域。我们对南澳大利亚塔特勒克布拉克(TTLK)地区的四个花岗岩套件进行了全面研究:生物花岗岩(BG)、单斜花岗岩(MG)、K长石花岗岩(KG)和白云母花岗岩(LG)。岩石学、地球化学和锆石U-Pb年代测定的综合研究显示,这些花岗岩分别形成于494、451、414和418Ma,源自与南澳俯冲大陆地壳有亲缘关系的原岩。相平衡模型表明,BG是在~800°C和0.6 GPa条件下形成的,而MG、KG和LG则是由BG岩浆在温度和压力逐渐降低的条件下(分别为750°C,0.5 GPa;740-700°C,0.2 GPa;700-640°C,0.1 GPa)分化结晶形成的。这些结果与之前的研究相结合,使我们能够重建南澳早古生代大陆掘起和随后造山运动塌陷的构造过程。重要的是,我们的研究结果表明,即使没有显著的地壳增生或地幔岩浆活动,俯冲大陆地壳部分熔融所产生的岩浆活动也能促进大陆地壳的地球化学演化,使其成分更趋向于长英岩。这项研究为了解深俯冲带大陆地壳的成分演变提供了一个有价值的案例,并对严重依赖弧岩浆作用进行地壳分异的传统模型提出了挑战。此外,我们的研究结果有助于更广泛地了解全球碰撞造山带的地壳演化过程,并突出了俯冲大陆物质的循环和分异在塑造地壳成分方面的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Multi-Stage Magmatism During Slab Exhumation Drives the Geochemical Evolution of Continental Crust: Insights From Paleozoic Granitoids in South Altyn, Western China

Multi-Stage Magmatism During Slab Exhumation Drives the Geochemical Evolution of Continental Crust: Insights From Paleozoic Granitoids in South Altyn, Western China

The present continental crust is characterized by a felsic upper crust and a mafic lower crust, resulting from significant geochemical differentiation over geological time. While various processes have been proposed to explain this differentiation, subduction zones remain pivotal regions for understanding the compositional evolution of continental crust. This study focuses on the South Altyn (SA) continental subduction-collision belt in western China, a unique setting that experienced ultra-deep (>300 km) continental subduction followed by multi-stage exhumation. We present a comprehensive study of four granitoid suites from Tatelekebulake (TTLK) area in SA: biotite granite (BG), monzogranite (MG), K-feldspar granite (KG), and leucogranite (LG). Comprehensive studies on petrology, geochemistry and zircon U-Pb dating show that these granitoids formed at 494, 451, 414, and 418 Ma, respectively, and originated from protoliths with affinity to the subducted continental crust in SA. Phase equilibrium modeling suggests that BG formed at ∼800°C and 0.6 GPa, while the MG, KG, and LG formed by differentiation crystallization of the BG magma under progressively decreasing temperature and pressure conditions (750°C, 0.5 GPa; 740–700°C, 0.2 GPa; and 700–640°C, 0.1 GPa, respectively). These results, combined with previous studies, allow us to reconstruct the tectonic processes of continental exhumation and subsequent orogenic collapse in SA during the Early Paleozoic. Importantly, our findings reveal that magmatism derived from partial melting of subducted continental crust can promote the geochemical evolution of continental crust toward more felsic compositions, even in the absence of significant crustal growth or mantle-derived magmatism. This study provides a valuable case for understanding the compositional evolution of continental crust in deep subduction zones and challenges conventional models that rely heavily on arc magmatism for crustal differentiation. Moreover, our results contribute to a broader understanding of crustal evolution processes in collisional orogens worldwide and highlight the importance of recycling and differentiation of subducted continental material in shaping crustal compositions.

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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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