摘要
通过对黑龙江省金厂金矿区J0号矿体中闪长岩角砾的单颗粒锆石LA-ICP-MS U-Pb形成年龄测定,获得205～207 Ma、116～130 Ma和104～114 Ma(加权平均年龄为110.6±1.1 Ma)三组年龄。结合锆石的晶形和Cl图像特征,进一步确定205～207 Ma是捕获印支晚期岩浆热事件形成的锆石;116～130 Ma远离谐和线,有明显的放射成因Pb丢失;而104～114 Ma(加权平均年龄为110.6±1.1Ma)具有代表闪长岩岩浆作用过程形成的锆石年龄。此项成果揭示在早白垩世孙家湾期(113～108Ma)曾发生过一期重要的中性岩浆热事件,而金厂金矿成矿作用应在110 Ma之后。
Single-zircon LA-ICP-MS U-Pb ages from diorite breccias of J0 ore body in Jinchang gold deposit, Heilongjiang are dated. The dating age contains three groups： 205 -207 Ma, 116 -130 Ma and 104 -114 Ma （the weighted average age as 110. 6 ± 1.1 Ma）. According to the crystalline shape of zircons and CL image char- acters, the zircon from first group formed during late Indosinian epoch magmatic event; the second are far from the concordant line with obvious radiogenic lead （Pb） loss ; the third can represent the zircon ages which formed during the process of diorite magmatism. It indicates that there had been a neutral magmatic events during the Sunjiawa- nian stage of Early Cretaceous （113 -108 Ma） , that the mineralization happened later than 110 Ma in Jinchang gold deposit.
出处
《世界地质》
CAS
CSCD
2013年第3期515-521,共7页
World Geology
关键词
闪长岩
锆石U-Pb年龄
成岩成矿时代
金厂金矿
黑龙江省
diorite-porphyrite
zircon U-Pb dating
ages of diagenesis and mineralization
Jinchang golddeposit
Heilongjiang Province
