秦岭造山带小南沟金矿床原位独居石定年及矿物化学意义

IF 3.2 2区地球科学 Q1 GEOLOGY

Ore Geology Reviews Pub Date : 2025-07-03 DOI:10.1016/j.oregeorev.2025.106750

Dexian Zhang , Shaowei Chen , Shuishi Zen , Ziqi Hu , Richard C.Bayless

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引用次数: 0

摘要

本文对秦岭造山带小南沟金矿床进行了研究，为研究与中生代伸展构造有关的成矿过程提供了重要线索。主要的科学问题集中在金矿化的时间、成矿流体的演化以及控制金矿沉积的机制上。地质背景表明，小南沟矿床形成于晚三叠世碰撞后伸展构造时期，是造山带金矿形成的关键时期。受构造活化和岩浆-热液活动的影响，矿床具有多期成矿作用。矿床中黄铁矿、云母、铁云母等矿物组合显示出独特的地球化学特征，揭示了成矿流体的演化过程。这些流体由早期富铁、富锶的氧化流体演变为后期富镁、富铝的还原流体，反映了流体化学和成矿条件的显著变化。矿物化学数据，包括黄铁矿、云母和铁白云石的微量元素地球化学数据，突出了岩浆和地壳来源的参与，砷（As）、碲（Te）和稀土元素（REEs）的浓度显著。这些元素的存在表明成矿过程中存在明显的流体-岩石相互作用，其中砷和碲在金的搬运和沉积中起关键作用。在流体冷却和还原过程中，不可见的金被纳入黄铁矿中，并以碲化金络合物的形式稳定下来。单独居石U-Pb年代学数据显示，其成矿年龄为213.7±0.8 Ma，对应晚三叠世，与构造活化期和岩浆侵位期一致。小南沟矿床的地质意义在于它是晚三叠世造山后伸展期形成的造山带金系统。研究突出了伸展构造、岩浆流体和热液流体演化之间的成因联系，为认识秦岭造山带金矿成矿提供了一个全面的框架，并为今后在该地区寻找类似矿床提供了指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

In-situ monazite dating and mineral chemistry of Xiaonangou Au deposit, Qinling orogenic belt: Implications for Au mineralization

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In-situ monazite dating and mineral chemistry of Xiaonangou Au deposit, Qinling orogenic belt: Implications for Au mineralization

This study investigates the Xiaonangou gold deposit, located in the Qinling orogenic belt, providing key insights into metallogenic processes linked to Mesozoic extensional tectonics. The main scientific questions focus on the timing of gold mineralization, the evolution of ore-forming fluids, and the mechanisms controlling gold deposition.

The geological background indicates that the Xiaonangou deposit formed during the Late Triassic post-collisional extensional tectonic regime, which is a critical period for the formation of orogenic gold deposits. The deposit is characterized by a multi-stage mineralization process, influenced by tectonic reactivation and magmatic-hydrothermal activity.

Mineral assemblages in the deposit, including pyrite, mica, and ankerite, display distinct geochemical signatures that reveal the evolution of ore-forming fluids. These fluids evolved from oxidized, Fe- and Sr-rich compositions in the early stages to reduced, Mg- and Al-enriched fluids in the later stages, reflecting significant changes in fluid chemistry and mineralization conditions.

Mineral chemistry data, including the trace element geochemistry of pyrite, mica, and ankerite, highlight the involvement of both magmatic and crustal sources, with notable concentrations of arsenic (As), tellurium (Te), and rare earth elements (REEs). The presence of these elements suggest significant fluid-rock interactions during the mineralization process, with arsenic and tellurium playing key roles in gold transport and deposition. Invisible gold was incorporated into pyrite and stabilized as gold-telluride complexes during fluid cooling and reduction.

Chronological data from U-Pb dating of monazite reveal a precise mineralization age of 213.7 ± 0.8 Ma, which corresponds to the Late Triassic, aligning with the period of tectonic reactivation and magmatic fluid emplacement.

The geological significance of the Xiaonangou deposit lies in its role as an orogenic gold system that formed during Late Triassic post-orogenic extension. The study highlights the genetic link between extensional tectonics, magmatic fluids, and hydrothermal fluid evolution, providing a comprehensive framework for understanding gold metallogenesis in the Qinling orogen and guiding future exploration for similar deposits in the region.

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来源期刊

Ore Geology Reviews 地学-地质学

CiteScore

6.50

自引率

27.30%

发文量

546

审稿时长

22.9 weeks

期刊介绍： Ore Geology Reviews aims to familiarize all earth scientists with recent advances in a number of interconnected disciplines related to the study of, and search for, ore deposits. The reviews range from brief to longer contributions, but the journal preferentially publishes manuscripts that fill the niche between the commonly shorter journal articles and the comprehensive book coverages, and thus has a special appeal to many authors and readers.