| 东昆仑地区矽卡岩型矿床地质特征、成矿时代及成矿环境 |
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| 引用本文：.2004.Geological Characteristics, Metallogenic Epochs and Metallogenic Settings of Skarn-Type Ore Deposits in East Kunlun Area[J].Mineral Deposits,23(Z):124~130 |
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| 基金项目:地质大调查综合研究项目（K1.4-3-2和200110200058） |
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| 中文摘要:在东昆仑地区已发现的内生金属矿床主要有矽卡岩型、玢岩型、蚀变岩型、脉型和岩浆（镁铁-超镁铁）型等5类，其中以分布于昆北带和昆中带的矽卡岩型铁多金属矿床占主要地位。对该类矿床成矿地质特征、成矿条件、成矿时代以及成矿构造环境的研究表明，成矿发生于华力西晚期到印支早期。经测试得出，矿化花岗闪长斑岩中锆石U-Pb年龄为（264±12）Ma，矽卡岩化花岗闪长斑岩为（278.2±3.6）Ma和（246±3.9）Ma。成矿背景和区域矿产分布显示，该区域华力西-印支期成矿与其独特的古特提斯陆缘构造环境密切相关。 |
| 中文关键词:东昆仑 矽卡岩型矿床 地质特征 成矿时代 |
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| Geological Characteristics, Metallogenic Epochs and Metallogenic Settings of Skarn-Type Ore Deposits in East Kunlun Area |
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| Abstract:The endogenetic metallic deposits already discovered in East Kunlun area mainly consist of five types, namely, skarn type, porphyrite type, altered rock type, vein type and magmatic (mafic-ultramafic) type. The skarn-type iron polymetallic deposits distributed in North Kunlun and Central Kunlun occupy the most important position. A study of geological characteristics, formation conditions, ore-forming backgrounds and metallogenic epochs of this type of deposits indicates that the ore-forming process lasted from Late Variscan orogeny to Early Indosinian period. Tests show that the single zircon U-Pb isotope age of mineralized granodiorite porphyry is (264±12) Ma, and that of skarnized granodiorite porphyry is (278.2±3.6) Ma and (246±3.9) Ma. Metallogenic setting and regional distribution of mineral resources reveal that the regional metallogenic process from Variscan orogeny to Indosinian period is related to the special tectonic setting of Paleo-Tethyan continental margin. |
| keywords:East Kunlun Mountains, skarn-type ore deposit, geological characteristics, metallogenic epoch |
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