黑龙江金厂铜金矿区晚三叠世—早侏罗世花岗杂岩锆石U—Pb定年和岩浆热演化史示踪

黑龙江金厂铜金矿床地处兴蒙造山带的北东端,兴凯—延边中生代岩浆构造带北部。对该矿区花岗岩杂岩体开展锆石CL图像、U--Pb定年和演化史示踪,结果表明它较好地记录了该区晚三叠世早期—早侏罗世岩浆连续作用的热演化史。岩浆演化大致经历了6个阶段:岩浆房冷却结晶、早期岩浆缓慢结晶、岩浆上涌过程中快速结晶、主体花岗岩浆降温结晶、晚期岩浆热液结晶和残余岩浆热液结晶过程。整个岩浆演化过程至少经历了23Ma,呈现相对连续的岩浆就位过程。

Zircon U-Pb dating and magmatic evolution history tracing of Late Triassic- Early Jurassic granitic complex in Jinchang Cu-Au deposit area，eastern Heilongjiang

The Jinchang Cu- Au deposit is located in the eastern edge of Xing- Meng orogenic belt，northern Xingkai- - Yanji tectonic- magmatic belt． We introduce the zircon CL images，U- Pb dating and tracing of the magma evolutionary history on the granitic complex in Jinchang Cu - Au deposit． The results show that it records the ther- mal evolution history of Late Triassic- Early Jurassic continuous magmatism well in this area． The magma evolution has undergone approximately six stages，including of the cooling crystallization of magma chamber，the slow crys- tallization of early stage magma，the fast crystallization during emplacement process of magma，the cooling crystal- lization of main granitic magma，the crystallization of late stage magma- hydrothermal fluid and the crystallization of the remainder magma- hydrothermal fluid． The whole process appeared relative continuous emplacement of magma， and lasted for 23 million years at least．