辽东五龙金矿围岩片麻状花岗岩的侵位和变形时代:SHRIMP U-Pb年代学制约

为了确定五龙金矿围岩的侵位和变形时代，进一步探讨辽东地区晚中生代构造体制转折时限，采用岩相学观察和锆石SHRIMP U-Pb定年技术，对辽东五龙大型金矿的围岩五龙岩体、侵入五龙岩体中的花岗斑岩脉和三股流岩体进行了研究。结果表明，五龙岩体具弱片麻状、片麻状构造，花岗斑岩脉也发生了变形作用，三股流岩体未发生变形作用。五龙岩体SHRIMP U-Pb年龄为（159.2±1.9） Ma和（160.0±1.4） Ma，花岗斑岩SHRIMP U-Pb年龄为（132.14±0.85） Ma，三股流岩体SHRIMP U-Pb年龄为122~124 Ma。辽东五龙岩体经历的推覆、挤压事件止于132~124 Ma。辽东地区晚侏罗世的推覆、挤压事件与古太平洋板块向欧亚大陆俯冲作用关系密切，五龙金矿的成矿大地构造背景亦与此次俯冲有关。

EMPLACEMENT AND DEFORMATION AGE OF SURROUNDING GNEISSIC GRANITE IN WULONG GOLD DEPOSIT, EASTERN LIAONING PROVINCE: SHRIMP U-PB AGE

In order to determine the emplacement and deformation age of the surrounding rocks of the Wulong gold deposit and further explore the transition period of Late Mesozoic tectonic regime in eastern Liaoning, using petrographic observation and zircon SHRIMP U-Pb dating techniques, the Wulong rock mass around the Wulong gold deposit in eastern Liaoning, the intrusive granulite porphyry veins in the Wulong rock mass, and the Sanguliu rock mass were studied. The results show that the Wulong rock mass is a typical rock with a weak gneissic, gneissic structure, the granitic porphyry veins, which have been invaded, have also been deformed, and the Sanguliu rock mass is not deformed. The Wulong rock mass SHRIMP U-Pb age is 159.2±1.9 Ma and 160.0±1.4Ma, granite porphyry is 132.14±0.85 Ma and the Sanguliu rock mass is 122-124 Ma. The Liaodong Wulong rock mass experienced the push, the extrusion event ending at 132-124 Ma. The overburden and squeeze events of the Late Jurassic in Liaodong area are closely related to the subduction of the ancient Pacific plate to Eurasia. The metallogenic tectonic setting of the Wulong gold deposit is also related to this subduction.