Zircon Senstive High Resolution Ion Microprobe (SHRIMP) study of granitoid intrusions in Zhaoye Gold Belt of Shandong Province and its implication |
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| Authors: | Laicheng Miao Zhenkuan Luo Jiazhan Huang Kang Guan G L Wang J N Mcnaughton I D Groves |
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| Institution: | (1) Tianjin Geological Academy, Ministry of Metallurgical Industry, 300061 Tianjin, China;(2) Key Centre for Strategic Mineral Deposits, Department of Geology & Geophysics, University of Western Australia, W.A. 6907 Nedlands, Australia |
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| Abstract: | The zircon Sensitive High Resolution Ion Microprobe (SHRIMP) results show that granitoid intrusions in Zhaoye 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 plutonic 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 place between 126 Ma and 120 Ma.
Project supported by the Sino-Australian Economic and Technical Fund. |
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| Keywords: | Zhaoye Gold Belt granitic intrusion SHRIMP magmatic zircon inherited zircon |
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