中文摘要:文章在总结前人研究成果的基础上,综合论述了西南天山金矿的成矿地质背景、金矿床的时空分布和基本特征。根据矿床地质特征和控矿因素,将西南天山的金矿划分为与剪切带有关的金矿床、与侵入岩有关的金矿床(包括斑岩型)、石英_重晶石脉型金矿床、与火山岩有关的金矿床和矽卡岩型金矿床5类,其中与剪切带有关的金矿床是最重要的矿床类型。探讨了西南天山金矿的成矿时代、成矿物质和成矿流体来源,以及成矿地球动力学机制。提出与剪切带有关的金矿床成矿物质主要来源于岩浆和海相碳酸盐岩,成矿流体主要来源于岩浆水或主要来自大气降水,混合少量岩浆水。石英_重晶石脉型金矿床成矿物质来自容矿地层,成矿流体主要来源于沉积建造水。与剪切带有关的金矿、与侵入岩有关的金矿、石英重晶石脉型金矿和矽卡岩型金矿成矿时代主要集中在二叠纪—三叠纪,形成于后碰撞构造演化阶段。斑岩型和浅成低温热液型金矿床形成于岛弧挤压环境。
Abstract:The metallogenic setting, time_space distribution and basic characteristics of gold deposits in southwest Tianshan Mountains are described briefly in this paper. According to geological characteristics and ore_controlling factors, the gold deposits in southwest Tianshan Mountains can be classified into five principal types, namely, (1) shear zone_related gold deposits, (2) intrusion_related gold deposits, including porphyry deposits, (3) quartz_barite vein_type gold deposits, (4) volcanics_related gold deposits, and (5) skarn_type gold deposits. Among them, the shear zone_related gold deposits constitute the main type of gold deposits in this region. The shear zone_related gold deposits occur in Late Silurian, Early Devonian and Carboniferous carbonaceous clastic rocks and pyroclastic rocks, with the ore_hosting rocks assuming characteristics of turbidites. Gold mineralized zones are controlled by shear zones and gold ore bodies are governed by dilational fracture zones within these shear zones. Gold mineralization is related to the deformation caused by ductile shearing and magmatic activity. The intrusion_related gold deposits occur in internal contact zones, exo_contact zones and fractured zones in the nearby pluton. These plutons are mainly granodiorite, granite and quartz porphyry, with minor alkali feldspar granite and mafic dykes. Gold mineralization can be divided into quartz vein type, porphyry type and altered rock type. The quartz_barite vein_type gold deposits occur in Upper Devonian fine_grained clastic rocks. Gold mineralization is controlled by a series of gently tilted fractured zones. The volcanics_related gold deposits are related to Silurian and Carboniferous volcanic hydrothermal activity, with most deposits commonly associated with Cu deposits. The skarn gold deposits occur in the garnet_diopside skarn in the exo_contact zones of the pluton and are commonly associated with Cu, Sn and Fe polymetallic deposits.The ore_forming materials of the shear zone_related gold deposits were mainly derived from magmatic and carbonate carbon, and ore_forming fluids came chiefly from magmatic fluids or meteoric water, with a minor part from magmatic fluids. The ore_forming fluids of the quartz_barite vein_type gold deposits were mainly derived from basinal fluids, and the ore_forming substances came predominantly from the sedimentary host rocks. The shear zone_related gold deposits, intrusion_related gold deposits, quartz_barite vein_type gold deposits and skarn gold deposits occur in Permian_Triassic strata and were formed in the post_collision period. The porphyry gold deposits and epithermal gold deposits were formed in an arc compressional environment.
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基金项目:国家重点基础研究发展计划项目(编号2007CB411302,2001CB 409807)、国土资源大调查项目(1212010561506)和国家自然科学基金项目(编号40672065)
引用文本:
杨富全,毛景文,王义天,赵财胜,张 岩,刘亚玲.2007.新疆西南天山金矿床主要类型、特征及成矿作用[J].矿床地质,26(4):.2007.Major types, characteristics and metallogeneses of gold deposits in southwest Tianshan Mountains, Xinjiang[J].Mineral Deposits26(4):
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