东昆仑地区矽卡岩型矿床地质特征、成矿时代及成矿环境  

Geological Characteristics,Metallogenic Epochs and Metallogenic Settings of Skarn-Type Ore Deposits in East Kunlun Area

作　　者：钱壮志[1] 汤中立[1] 焦建刚[1] 唐冬梅[1] 

机构地区：[1]长安大学,陕西西安710054

出　　处：《矿床地质》2004年第S1期124-130,共7页Mineral Deposits

基　　金：地质大调查综合研究项目(K1.4-3-2和200110200058)的资助

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。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.

关 键 词：东昆仑 矽卡岩型矿床 地质特征 成矿时代 

分 类 号：P588.312[天文地球—岩石学]