中文摘要:华北陆块与其陆缘构造活动性的差异和两者相依演化的互动性,导致在古生代成矿环境的变化和重要成矿作用类型上的不同。在陆块内以沉积成因矿产为主:磷矿、石膏矿、石灰岩矿(?-O2)、金刚石矿(O3)。在陆缘活动带以岩浆活动有关的成矿类型为主:喷气-火山成因类黄铁矿型铜多金属矿(加里东期、华力西期);铁质基性-超基性岩岩浆熔离型铜、镍(PGE)硫化物矿(加里东期、华力西期);热液型金矿(加里东期、海西期)和喷气-沉积型铁铜矿床、铁铌稀土矿床(加里东期)。通过与华北陆块南北陆缘加里东期褶皱带的对比,发现镜铁山-柳沟峡铁铜矿、白鄂博铁铌稀土矿可能归属于加里东期成矿。与新疆华力西期造山带的对比,认为红旗岭等铜镍矿床应与加里东期构造背景相一致。由此可见,加里东构造成矿旋回不仅为承上启下的重要环节,特别受华力西旋回及更新构造旋回的叠加、改造,而且保留有一批大型、超大型矿床,因而华北陆块及其陆缘加里东期构造-成矿旋回的历史地位应予以充分肯定.
Abstract:The difference of tectonic movement between North China landmass and its margin and their interaction in evolution resulted in the change of ore-forming environment in Paleozoic and difference in the main ore-forming types. Therefore, in the landmass there are mainly sedimentary mineral deposits, such as apatite, gypsum, limestone (∈-O2), diamond (O3), whereas in the epicontinental active belt there are mainly ore deposits related to magmatic activity, such as pyrite-Cu-polymetallic deposits of exhalative volcanic type and magmatic liquation type Cu, Ni (Pt) sulfide deposits of ferruginous basic to ultrabasic rocks in Caledonian and Variscan, hydrothermal type Au deposits in Caledonian and Variscan, and exhalative sedimentary type Fe, Cu deposits, Fe, Nb, rare earth deposits in Caledonian. A comparison with the Caledonian folded belt along the northern and southern margins of North China Landmass shows that the Jingtieshan-Liugou Fe, Cu deposits and the Bayan Obo Fe, Nb, rare earth deposits should belong to Caledonian. A comparison with the Variscan orogenic belt in Xinjiang shows that the ore-forming tectonic background of the Hongqiling Cu,Ni deposit is identical with that of Caledonian. It can thus be concluded that the Caledonian tectono-metallogenic cycle served as a connecting link and was subjected to superposition and reformation of Variscan and renewed tectonic cycles. It made a great contribution to the post-Caledonian mineralization in that it preserved a lot of large and superlarge deposits. The historical position of Caledonian tectono-metallogenic cycle in North China landmass and its margin should be affirmed.
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基金项目:地质调查项目专题“古生代成矿作用”(编号:K1.4-3-2)
引用文本:
邬介人,任秉琛.2004.华北陆块及其陆缘古生代重要成矿作用类型和加里东构造成矿旋回的历史地位[J].矿床地质,23(Z):99~111.2004.Type of an Important Paleozoic Ore-forming Process in North China Landmass and Its margin and Historical Position of Caledonian Tectono-Metallogenic Cycle[J].Mineral Deposits23(Z):99~111
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