| 右江裂谷区三叠系岩石物性特征及其与金矿化的关系 |
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| 引用本文： | 张景荣,陆建军,张晓豪,盛雪芬.右江裂谷区三叠系岩石物性特征及其与金矿化的关系[J].矿床地质,1997,16(4):340-348. |
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| 作者姓名： | 张景荣 陆建军 张晓豪 盛雪芬 |
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| 作者单位： | 南京大学地球科学系 |
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| 基金项目： | 国家自然科学基金,高等学校博士学科点专项科研基金 |
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| 摘 要： | 本文阐述了右江裂谷区微细粒浸染型金矿床控矿层位三叠系百蓬组泥质粉砂岩及砂质泥岩的粒度，比表面、孔隙度及孔隙类型和渗透率等物性特征，讨论了与其成矿流体的循回、水岩反应及其有效浸取围岩矿物质的关系。在此基础邮成矿流体和矿矿物质主要来自于地层；由于热液躲避低势能方向迁移，造成断理解发的盆地边缘区和水下隆起周围的环状断裂带为金矿床沉淀的场所。并通过形成金矿所需热液量的估算得出，该区金矿床的形成，是由于热流
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| 关 键 词： | 岩石物性 成矿流体 热液循回 金矿床 矿化 |
Physical Characteristics of Triassic Sedimentary Rocks and Their Relations to Gold Mineralization in Youjiang Rift Zone |
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| Zhang Jingrong,Lu Jianjun,Zhang Xiaohao and Sheng Xuefeng.Physical Characteristics of Triassic Sedimentary Rocks and Their Relations to Gold Mineralization in Youjiang Rift Zone[J].Mineral Deposits,1997,16(4):340-348. |
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| Authors: | Zhang Jingrong Lu Jianjun Zhang Xiaohao and Sheng Xuefeng |
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| Abstract: | This paper studies grain size, specific surface, porosity, pore type and permeability of pelitic siltstones and sandy mudstones of Triassic Baipeng Group which control the distribution of fine grained disseminated type gold deposits in Youjiang rift zone, and also discusses their relations to the circulation of ore forming fluids, the interactions between the fluids and sedimentary rocks in the Baipeng Group, and the gold mineralization. The pelitic siltstones and sandy mudstones have bigger specific surface, porosity and permeability and better continuous interstice, which play a key role in the extensive circulation of the ore forming fluids, the interactions between the fluids and the sedimentary rocks, and the migration of gold. The ore forming fluids and gold came from the Triassic sedimentary rocks. The ore forming fluids derived from the pore water and the absorbed water liberated during the dehydration process of the sedimentary rocks and the formation water sealed in the strata circulate extensively owing to the action of pressure and thermal gradient. The gold in the strata is extracted through interactions between the fluids and the strata, migrates in the form of HS - Au complex or gold organic complex, and precipitates in the decompression zone. Therefore, the margin of a basin with well developed faults and the peripheral ring faults of the underwater uprift are favorable places for gold deposition. Calculation of fluid amounts for the formation of gold deposits in Jinya and Gaolong gold ore districts indicates that water quantities in the sedimentary rocks within the limits of gold districts are much lower than those required for transportation of gold in the deposits, suggesting that the ore forming fluids have probably undergone extensive circulation beyong the gold ore districts. |
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| Keywords: | physical characteristics of rocks gold mineralization ore forming fluids circulation of fluids amount of metallic extract |
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