辽宁凤城白云金矿硅钾蚀变岩型金矿的发现及其意义
Discovery and Significance of Si-K Altered Rock Type Gold Deposit in Baiyun Gold Deposit
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摘要: 辽宁凤城白云金矿位于辽东裂谷金成矿域,经近期地质勘查工作,取得地质找矿重大突破。新发现矿体呈似层状、脉状、扁豆体状赋存于东西向展布的硅钾蚀变岩带及盖县组层间破碎带之中。矿石结构主要为他形粒状、自形-半自形粒状、乳滴状、球粒状和胶状等,构造主要有团块状、浸染状、细脉-细网脉状、条带状-条纹状、斑点状和角砾状等。金矿物赋存状态主要以包裹金、间隙金、裂隙金形式呈不规则粒状、细脉状、树枝状等分布。成因类型系沉积变质高-中温热液改造型金矿床。探获122b+333金资源量33 849 kg、伴生银85 834 kg。不仅探明大型可供详查矿产地一处,而且发现了该区新的金矿成因类型,即硅钾蚀变岩型。这种新类型金矿的重大发现为寻找硅钾蚀变岩型金矿、实现地质找矿的新突破指明方向。Abstract: By recent geology exploration, a significant breakthrough in geological prospecting has been achieved in Baiyun gold deposit located in gold metallogenetic domain of Liaodong rift. The newly discovered gold orebodies occurred in both east-west Si-K altered rock belt and interlaminar fracture zone, assuming stratoid forms, veins, and lentils hosts. Ore textures are anhedral granular, euhedral-subhedral granular, droplet-shaped, sphaerolitic, and gelatineous, etc. Ore structures are lumpy, disseminated, veinlet-stockwork, banded-striped, speckled, and brecciated, etc. Gold mineral occurrence are mainly inclusion gold, gap gold, fissure gold in the form of irregular granular, veinlet, dendritic distributions. The genetic type is of sedimentary metamorphic high -mesothermal transformation gold deposit. We not only found one large gold deposit, but also discovered new gold genetic type (Si-K altered rock type gold deposit). Discovery of the new type gold deposit shows the direction for searching Si-K altered rock type gold deposit and seeking breakthrough in new geological prospecting.
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Key words:
- Si-K altered rock type /
- prospect analysis /
- Baiyun gold deposit /
- Fengcheng
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