A Study of Ore-Forming Characteristics, Ore-Forming Elements and Ore-Prospecting Criteria of Jiudian Gold Deposit in Huanglong Goldfield, South Qinling
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摘要: 黄龙金矿田酒店金矿床位于南秦岭印支褶皱带白水江-白河褶皱束东段，北邻留凤关-金鸡岭褶皱束，南接北大巴山加里东褶皱带紫阳-中峰褶皱束的牛山复背斜；金矿体严格受地层岩性、韧性剪切带、脉岩三重控制。矿石类型属于蚀变岩型金矿；蚀变主要有硅化、绢云母化、黄铁矿化等。通过综合分析，初步认为区域构造运动为金成矿提供了强大的动力及有利的富集部位和容矿空间，火山沉积及富金的陆源碎屑沉积带来本区最初的金矿来源，多期韧性剪切构造以及印支期侵入岩侵入带来的热源、热液及深部物质的叠加再造富集，最终形成金矿床；详述了控矿因素，总结出地层岩性、构造、脉岩、围岩蚀变和地形地貌、地球化学6个方面的找矿标志。Abstract: Huanglong Goldfield is located in the eastern part of Baishuijiang-baihe fold bundle，indosinian fold belt of South Qinling, with Liufengguan-Jinjiling fold bundle in the north and Ziyang-zhongfeng in the south. The gold orebodies are strictly controlled by stratigraphic lithology, ductile shear zone, and vein rock. The ore type is altered rock type of gold deposit, and the alteration is mainly silicification, sericitization, pyritization and so on. Based on the previous analysis, the authors hold that regional tectonic movement provided powerful motivation and favorable concentration area for mineralization. Volcanic sedimentary and clastic sediments were the original sources of gold deposit. The superposition and enrichment of the thermal sources, hydrothermal solution and deep substances brought by the intrusive rock in Indosinian period, and the ductile shear structure finally co-formed the gold deposits. In addition, this paper described in details the ore-controlling factors and summarized such six aspects of ore-prospecting criteria as stratigraphic lithology, structure, vein rock, wall-rock alteration, geomorphology and geochemistry.
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Key words:
- Jiudian gold deposit /
- Huanglong goldfield /
- sedimentary remodeling /
- south Qinling /
- Shaanxi Province
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