Zircon Senstive High Resolution Ion Microprobe (SHRIMP) study of granitoid intrusions in Zhaoye Gold Belt of Shandong Province and its implication

查看全文 作　　者：[1]苗来成;[1]罗镇宽;[1]黄佳展;[1]关康;N.J. [2]McNaughton;D. I. [2]Groves 机构地区：[1]Tianjin Geological Academy, Ministry of Metallurgical Industry, Tianjin 300061, China;[2]Key Centre for Strategic Mineral Deposits, Department of Geology & Geophysics, University of Western Australia, Nedlands, W.A. 6907, Australia 出　　处：《Science China Earth Sciences》索引1997年第40卷第4期,共9页 基　　金：Project supported by the Sino-Australian Economic and Technical Fund 摘　　要：The zircon Sensitive High Resolution Ion Microprobe (SHRIMP) results show that granitoid intrusions in Zhaoyc Gold Belt were emplaced at two periods of Mesozoic: Linglong and Luanjiahe types of granitic intrusions were emplaced between 160 Ma and 150 Ma (late Jurassic); Guojialing type of granodioritic intrusions, 130 Ma and 126 Ma (early Cretaceous). All the three types contain at least two major generations of inherited zircons with Precambrian ( >650 Ma) and early Mesozoic ages (200-250 Ma), respectively. The former suggests that these plu-tonic rocks are of crustal origin and that Precambrian basement with component of sialic crust up to 3.4 Ga old ( Middle Archean) exists in the region. The presence of abundant inherited zircons with early Mesozoic age indicates that the Precambrian basement was affected by a major tectono-thermal event, that is the collision of the North and South China blocks, at 250 Ma to 200 Ma. SHRIMP results also indicate that the gold mineralization in the region took 关 键 词：Zhaoye Gold Belt GRANITIC intrusion. SHRIMP magmatic ZIRCON INHERITED ZIRCON