豫西火神庙岩体锆石U-Pb年代学、 地球化学及Hf同位素组成
Zircon U-Pb Chronology, Geochemistry and Hf Isotopic Compositions of the Huoshenmiao Pluton, Western Henan

火神庙岩体位于华北陆块南缘栾川矿集区西部，为一杂岩体，该岩体与火神庙钼矿床密切相关.目前，人们对火神庙岩体的研究程度较低，严重制约了对火神庙钼矿床成因的认识.系统开展了年代学、地球化学和Hf同位素组成研究.结果表明，石英闪长岩、二长花岗岩和花岗斑岩的形成年龄分别为150.3±0.6Ma、146.0±0.6Ma和145.1±0.5Ma，为栾川矿集区晚侏罗世第2次大规模岩浆活动的产物.火神庙杂岩体属于I型花岗岩，是不同源区部分熔融形成的岩浆上升就位的结果.石英闪长岩是富集岩石圈地幔部分熔融的产物；二长花岗岩和花岗斑岩是富集岩石圈地幔部分熔融形成的镁铁质岩浆与太华群TTG岩系部分熔融形成的长英质岩浆混合后上升就位的结果.
The Huoshenmiao pluton located in the west of the Luanchuan ore district,southern margin of the North China Craton (NCC) is mainly composed of quartz diorite, monzo-granite and granite porphyry.The Huoshenmiao pluton is closely related to the Huoshenmiao Mo deposit.While the degree of research on the Huoshenmiao pluton is very low, which seriously restrict the understanding of the genesis of the Huoshenmiao Mo deposit.Three types of rock including quartz diorite,monzo-granite and granite porphyry has been researched by zircon U-Pb chronology,geochemistry and Hf isotope.The forming ages of quartz diorite,monzo-granite and granite porphyry are 150.3±0.6Ma, 146.0±0.6Ma and 145.1±0.5Ma respectively,and are products of the second magmatism of the Luanchuan ore district,Late Jurassic. Geochemistry and zircon Hf isotope show that the Huoshenmiao pluton belongs to I-type granite,and it results from ascending magma formed by partial melting of different source regions.The quartz diorite stems from remelting of the enriched mantle, while the monzo-granite and granite porphyry are the products of mafic magma derived from remelting of the enriched mantle mixed with felsic magma derived from remelting of the Taihua TTG