中国东部胶东半岛潘子建金矿床的成因:流体包裹体和同位素的启示

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Mingzhen Li , Guangzhou Mao , Zhengjiang Ding , Qinglin Xu , Huiji Zhao , Yanchao Han , Tieliang He
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引用次数: 0

摘要

攀枝花金矿床位于华北克拉通东缘的胶北隆起带。它是栖霞-蓬莱矿带南端的一个石英脉型金矿床。为探明潘子涧金矿床成矿流体和物质的来源与性质,探索成矿过程,揭示矿床成因,本研究对含金石英流体包裹体进行了岩相观察和温度测量、激光拉曼实验、含金石英H-O同位素研究和含金黄铁矿Pb同位素研究。潘集金矿床分为四个成矿期,其中Ⅲ成矿期为主要成矿期。流体包裹体显示,攀枝花金矿床的成矿流体属于CO2-H2O-NaCl体系,温度低(172-341 ℃)、盐度低(1.57-10.49 wt% NaCl)、密度低(0.79-0.96 g/cm3)。含金石英 H-O 同位素数据(δD = -79.8 至 -65.1‰,δ18OH2O = 1.33-2.63‰)显示,成矿流体来自岩浆水和陨石水的混合。具有地壳特征的含金黄铁矿铅同位素(206Pb/204Pb = 16.06-16.943,207Pb/204Pb = 15.337-15.858,208Pb/204Pb = 37.143-38.081,206Pb/207Pb = 1.025-1.105)支持部分成矿物质来源于地壳。我们提出了攀枝花金矿床的成矿模式:胶北隆起构造体系的应力转换诱发了星体隆起。岩浆压力下降,岩浆流体喷出。成矿流体沿局部断层上升,压力进一步下降,导致流体不溶,金沿着构造陷落(如断层)沉积。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Genesis of the Panzijian gold deposit in Jiaodong Peninsula, Eastern China: Insights from fluid inclusion and isotopes

The Panzijian gold deposit is located in the Jiaobei uplift on the eastern margin of North China Craton. It is a quartz vein-type gold deposit in the southern end of the Qixia-Penglai ore belt. In order to explore the source and properties of ore-forming fluids and materials in the Panzijian gold deposit, explore the ore-forming process and reveal the genesis of the deposit, this work has carried out petrographic observation and temperature measurement of gold-bearing quartz fluid inclusions, laser Raman experiment, gold-bearing quartz H–O isotope study, and gold-bearing pyrite Pb isotope study. The Panjian gold deposit is divided into four metallogenic stages and the metallogenic stage Ⅲ is the main gold mineralization stage. Fluid inclusions show that the ore-forming fluids at the Panzijian gold deposit belong to a CO2–H2O–NaCl system with low temperature (172–341 °C), salinity (1.57–10.49 wt% NaCl), and density (0.79–0.96 g/cm3). Gold-bearing Quartz H–O isotopic data (δD = −79.8 to −65.1‰, δ18OH2O = 1.33–2.63‰) show that the ore-forming fluid was derived from the mixing of magmatic water and meteoric water. Gold-bearing Pyrite Pb isotopes with crustal signature (206Pb/204Pb = 16.06–16.943, 207Pb/204Pb = 15.337–15.858, 208Pb/204Pb = 37.143–38.081, and 206Pb/207Pb = 1.025–1.105) support that some ore-forming materials were crust-derived. We proposed a metallogenic model for the Panzijian gold deposit: Stress transition of Jiaobei uplift tectonic system inducing asthenospheric upwelling. The lithostatic pressure dropped and fluids were exsolved from the magma. The ore-forming fluid ascended along local faults and the pressure further dropped, resulting in fluid immiscibility and gold deposition along structural traps (e.g., faults).

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来源期刊
Solid Earth Sciences
Solid Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
5.00%
发文量
20
审稿时长
103 days
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