| 山西省堡子湾金矿地质特征 |
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| 引用本文：.1996.Geological characteristics fo the Baoziwan gold deposit, Shanxi Province[J].Mineral Deposits,15(3):216~228 |
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| 基金项目:国家黄金基金《山两省阳高县堡子湾金矿床成矿规律研究》 |
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| 中文摘要:目前在晋北及晋蒙交界地区已发现数十个规模不等的类似角砾岩筒，均含金、银多金属矿化，已探明的有大型银矿、中型金或金银矿。研究表明，堡子湾金矿是一个与海西晚期中酸性次火山岩有成因联系的隐爆角砾岩简型热液金矿，成矿母岩为二长花岗斑岩。 |
| 中文关键词:金矿 地质特征 山西省堡子湾 |
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| Geological characteristics fo the Baoziwan gold deposit, Shanxi Province |
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| Abstract:The Baoziwan gold deposit is a crypoexplosion breccia pipe type hydrothermal gold deposit genetically related to Late Hercynian intermediate-acid subvolcanic rocks, with the parent rock being adamellite porphyry. During the activity of adamellite magma, intense cryptoexplosion took place, forming a steeply southward dipping breccia pipe l 000 m in length, l00 m in width, and over 400 m in downward extension. Gold orebodies occur in the contact zone between the breccia pipe and its wall rocks. Metallogenic temperatures are mainly 320~230℃, salinities of ore-forming fluids are 9.2～13.2 wt% NaCl, pH values of ore fluids are 4.25～4.91, Eh values are -0.459～ -0.598, and R (reduction parameters) are 0.045 ～0.132. Gas components of inclusions consist mainly of H2O and CO2, and also contain H2O, N2, CH4, and CO, with CO2/H2O ratios averaging 0.039; in liquid phase, cations are mainly Na+ and K+, whereas anions are mainly SO42- and Cl-. As for hydrogen and oxygen isotopic compositions, δ18O and δD are 10.0‰~14.9‰ and -64‰~ -90‰ respectively. δ34S values of sulfide minerals are -3.2‰～+l.2‰, with the maximum difference being 4.4‰. Up till now, scores of similar breccia pipes have been discovered in northern Shanxi as well as along the border area between Shanxi and Inner Mongolia. These pipes almost unexceptionally contain gold-silver mineralization, among which some have proved to be large-sized silver deposits, and some have turned out to be medium-sized gold or gold-silver deposits. It is worth noticing that breccia pipes along the Shanxi-Inner Mongolia border area and north of this area are mainly related to Hercynia n intermediate-acid subvolcanic rocks, whereas those in northern Shanxi to the south of this area are merely associated with intermediate-acid subvolcanic rocks. |
| keywords:gold deposit , gcological charactcristics, Baoziwan, Shanxi Province |
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