| 山东文登金矿成矿条件及成矿过程——阴极发光技术在包裹体研究中的应用 |
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| 引用本文： | 赖勇.山东文登金矿成矿条件及成矿过程——阴极发光技术在包裹体研究中的应用[J].矿床地质,1995,14(3):281-289. |
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| 作者姓名： | 赖勇 |
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| 作者单位： | 北京大学地质系 |
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| 摘 要： | 使用阴极发光技术可取得一般岩石显微镜无法得到的地质信息,并可将包裹体的研究从原来的“群分析”统计规律研究水平提高到“单包体分析”水平,获得更小时间单位成矿流体的演化特征,因而能更准确地模拟和恢复地质作用过程。运用阴极发光对石英等矿物的研究,发现蚀变带中的石英按不同的形态特征和发光性可以分为三期,和成矿关系密切为第一、二期石英。根据阴极发光下显示的生长微形态,系统地测试三期石英不同生长时期的包裹体物相,从而获取了整个成矿过程流体的p-t-v-x参数,确定构造作用加热大气降水形成成矿流体,体系开放流体两次减压沸腾导致金矿沉淀的矿体定位机理和成矿动力学机制。
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| 关 键 词： | 金矿床 成矿条件 成矿过程 包裹体 |
Metallogenic conditions and processes of the wendeng gold deposit, Shandong Province: The application of cathode-luminescence to fluid inclusion study |
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| Abstract: | Cathodoluminescence is a kind of crystal luminescence caused by the bombardment of electron beams from cathode onto the crystal surface. Usually, trace elements in a crystal are activators that influence the formation of the luminescence center. The composition of ore-bearing fluid changes during the growth of a crystal, so the same minerals of different generations or the growth zones of the same mineral crystal exhibit different luminescences under the cathodolu-mmescence microscope. This is helpful to distinguish minerals of different generations and crystal microstructural markers in which fluid inclusions can be found. More detailed data can be obtained by means of studying fluid inclusions in different growth zones. The Wendeng gold deposit is located approximately 30 km northwest of Wendeng, to the east of Mu-Ru metallogenic belt and on the west of Muzhu River fault, Shandong Province. The wall rock is migmatized plagiogneiss of Proterozoic Jingshan Group. Orebodies occur within the shattered alteration zone in the footwall of the NNE-trending F1 fault, and are composed mainly of quartz, pyrite, specularite, K-feldspar, sericite, carbonate and chlorite, being of the "Lingshan" type. The luminescence of quartz shows that the alteration might be divided at least into three stages, with mineralization closely related to the first and the second stage. Detailed p-t-v-x parameters of ore-bearing fluid were obtained from fluid inclusions trapped in the growth zone of minerals. The orebody location mechanism and metallogenic dynamics were determined, suggesting that tectonism heated meteoric water to form ore-bearing fluid, and the two depressurization and boiling events of open-system fluid led to gold precipitation. |
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| Keywords: | cathodoluminescence Wendeng gold deposit Metallogenic conditions |
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