马来西亚Penjom金矿矿脉结构、形态及其与金矿化的关系

IF 1.1 4区 地球科学 Q3 GEOLOGY Resource Geology Pub Date : 2022-01-01 DOI:10.1111/rge.12288
Zakaria Endut, T. Ng, Jasmi Hafiz Abdul Aziz, C. Makoundi, Haslikhalijah Dauad, K. Ariffin
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摘要

Penjom金矿床是位于马来西亚半岛中部地带的造山带金矿床。金矿化与变质沉积岩中以石英-碳酸盐脉体为主要寄主岩和长英质火成岩(包括少量火山岩)的各种样式和结构有关。从宏观和微观特征出发,研究了矿脉的结构特征和形态特征,以了解矿脉的形成过程及其与金矿化的关系。在手部标本尺度上,静脉显示出多种纹理,有的是原始的,有的是叠加的。主要结构为梳状、块状菱形buck石英脉和纹状脉或脉间隔,代表早期脉的引入,没有脉的修饰。通常与最大压应力方向一致的延伸脉在这些脉内显示出常见的梳状结构或在粗脉内显示出buck结构。次级织构为带状、柱头岩、角砾岩和覆盖在重复构造时期形成的早期脉上的晚期蜘蛛脉。后期变形事件叠加在现有脉体纹理上,导致脉体剧烈变形。构造、脉型和结构、金与硫化物矿物学的相互关系制约了奔奔金矿的成矿期次。脉状结构特征反映了围压静岩条件下流体通过裂缝和密封机制充填空间的物理环境。脉系和金矿化事件与D2D3(褶皱-断层)变形事件相关,并推断与影响马来西亚半岛的晚三叠世-早侏罗世晚期区域性造山事件在时间上相关。
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Texture and morphology of veins and their relationship to gold mineralization in the Penjom deposit, Malaysia
Penjom deposit is an orogenic gold deposit located in the Central Belt of Peninsular Malaysia. Gold mineralization is associated with various styles and textures of quartz‐carbonate veins hosted within the metasedimentary as the main host rock and felsic igneous rock including minor volcanic rock. Vein textural features and morphologies have been investigated based on macroscopic and microscopic characteristics to understand the process of veins formation, and the relationship with gold mineralization. At the hand specimen scale, veins show a variety of textures that are either primary or superimposed. Primary textures are comb, massive anhedral buck quartz veins, and laminae veins or vein septa representing early vein introduction without vein modification. Extension veins that are normally concordant to maximum compressive stress direction show either a common comb texture within these veins or buck texture inside thick veins. Secondary textures are ribbon, stylolites, breccias, and late spider veinlets that overprint early veins formed during repeated structural episodes. Later stage deformation events superimposed on the existing veins texture results in intensely deformed veins. The interrelationship of structure, vein‐type and texture, gold and sulfide mineralogy have been correlated to constrain the episodes of gold mineralization in the Penjom deposit. Characteristics of vein textures indicate physio‐environment under confining lithostatic pressure where fluids filled the space through crack and sealing mechanism. Vein systems and gold mineralization events that have been correlated with the D2D3 (fold‐fault) deformation events and inferred to be temporally related to the late‐stage regional orogenic event dated Late Triassic‐Early Jurassic that affected Peninsular Malaysia.
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来源期刊
Resource Geology
Resource Geology 地学-地质学
CiteScore
2.30
自引率
14.30%
发文量
18
审稿时长
12 months
期刊介绍: Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered. Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.
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