岩石圈对东昆仑造山带金属生成的影响:同位素和地球化学绘图的启示

IF 3.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Miao Yu , Qinghong Zeng , Hui Wang , Jiandong Zhang , Jingwen Mao , Chengyou Feng
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引用次数: 0

摘要

本研究利用东昆仑造山带(EKO)的地质和地球化学数据,探讨岩石圈结构对区域成矿作用的影响。我们探讨了特定岩石圈成分和结构如何影响成矿金和各种多金属矿床的形成。研究揭示了东昆仑造山带的成矿过程最初是针对大陆下岩石圈地幔(SCLM)中的变质富集源,并在古生代重新激活了下地壳。早中生代地壳与地幔相互作用形成的岩石圈结构导致了东昆仑造山带东部和西部成因金矿床规模的变化。在西部,较小的金矿床与中度地幔下沉和轻微富集的SCLM有关。地幔蜕变释放的含金流体与碰撞阶段的变质流体混合,促成了这些矿床的形成。相比之下,EKO 东部拥有较大的金矿床,这是由明显富集的SCLM形成的。碰撞后阶段广泛的岩石圈减薄过程导致含金地幔衍生流体和岩浆热液混合。此外,三叠纪时期的下地壳熔融导致斑岩-矽卡岩-热液矿床系统的矿化类型多样化。主要发现包括幼嫩肥沃的下地壳物质在形成铜多金属矿床中的作用、变质基底再加工对钼和钨矿床的重要性,以及旧沉积岩中的铅和锌沥滤对银铅锌矿床形成的影响。这项研究拓宽了我们对影响金属生成的地质因素的认识,并为今后在具有类似岩石圈结构的地区进行勘探和研究提供了一个框架。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Lithospheric influence on metallogenesis in the East Kunlun Orogen: Insights from isotopic and geochemical mapping

This study examines the influence of lithospheric architecture on regional metallogenesis, using geological and geochemical data from the East Kunlun Orogen (EKO). We explore how specific lithospheric components and structures affect the formation of orogenic gold and various polymetallic mineral deposits. The study reveals that metallogenic processes in the EKO initially targeted sources within the metasomatized-enriched subcontinental lithospheric mantle (SCLM) and reactivated lower crust during the Paleozoic era.

Lithospheric architecture, shaped by crust-mantle interactions occurred in the Early Mesozoic led to variations in the sizes of orogenic gold deposits between the eastern and western EKO. In the west, smaller gold deposits are linked to moderate mantle underplating and slightly enriched SCLM. Gold-bearing fluids released by mantle devolatilization mixed with metamorphism fluid in collision stage, contributing to the formation of these deposits. In contrast, the eastern EKO hosts larger gold deposits, resulting from significantly enriched SCLM. Extensive lithospheric thinning process in post-collision stage lead to the mixing of gold-bearing mantle-derived and magmatic-hydrothermal fluids. Fertilized magma differentiation potentially increases gold concentrations in this region.

Additionally, Triassic-era melting of the lower crust led to diverse mineralization types in porphyry-skarn-epithermal deposit systems. Key findings include the role of juvenile fertile lower crustal materials in forming copper polymetallic deposits, the importance of metamorphic basement reworking for molybdenum and tungsten deposits, and the influence of lead and zinc leaching from old sedimentary rocks on the formation of silver‑lead‑zinc deposits. This study broadens our understanding of the geological factors influencing metallogenesis and provides a framework for future exploration and research in regions with similar lithospheric architectures.

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来源期刊
Journal of Geochemical Exploration
Journal of Geochemical Exploration 地学-地球化学与地球物理
CiteScore
7.40
自引率
7.70%
发文量
148
审稿时长
8.1 months
期刊介绍: Journal of Geochemical Exploration is mostly dedicated to publication of original studies in exploration and environmental geochemistry and related topics. Contributions considered of prevalent interest for the journal include researches based on the application of innovative methods to: define the genesis and the evolution of mineral deposits including transfer of elements in large-scale mineralized areas. analyze complex systems at the boundaries between bio-geochemistry, metal transport and mineral accumulation. evaluate effects of historical mining activities on the surface environment. trace pollutant sources and define their fate and transport models in the near-surface and surface environments involving solid, fluid and aerial matrices. assess and quantify natural and technogenic radioactivity in the environment. determine geochemical anomalies and set baseline reference values using compositional data analysis, multivariate statistics and geo-spatial analysis. assess the impacts of anthropogenic contamination on ecosystems and human health at local and regional scale to prioritize and classify risks through deterministic and stochastic approaches. Papers dedicated to the presentation of newly developed methods in analytical geochemistry to be applied in the field or in laboratory are also within the topics of interest for the journal.
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