The Mesozoic Magmaticactivities Framework in Jiaodong Area:SHRIMP Chronology Recording of Single Particle Zircon
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Shandong Institute and Laboratory of Geological Sciences

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    Abstract:

    The Mesozoic tectonic magmatic events are closely related to the mineralization of gold deposits in Jiaodong area(JA for short), Shandong Province. And the major tectonic magmatic events are including: ①the Sulu highultrahigh pressure metamorphic belt, the same orogenic granite and the post orogenic high alkali belongs to the typical mantle source type granite series, which formed in tectonic setting of the North South trending collision between the Yangtze plate and the North China plate during the age of 220~200 Ma; ②The gneissic granite combination of early Linglong (Kunyushan) orogenic related to gold deposit were formed in late Jurassic period about 165~150Ma, which were peraluminous granitoid and the partial remelting products of Jiaodong basement rocks; ③The crustmantle mixed magmatic were crystallised and differentiation and formed the Guojialing granite mountain Victorchandler granodiorite at 135~110Ma. The Yanshan period is the peak period of magmatic activity in Jiaodong area. It is shown as the four strong tectonic magmatic event, which represents the four tectonic episode of the Yanshan orogenic event, and is characterized by the transformation from compression to extension. The research shows that the Mesozoic granites in Jiaodong area are characterized by inheritance and regeneration. Our SHRIMP UPb dating of the zircon collected from Guojialing superunit granites show that: Zircons age values from core to edges were 2573~2194Ma, 164.8~147.8 Ma and 126.6~126.2Ma, which shows the crystalline basement of Jiaodong, the formation dating information of Linglong granite and guojialing granite. Also, they reveal the complex inheritance and regeneration, that to say, the Jiaodong basement rock such as Neoarchaean Jiaodong rock group, TTG rocks and Paleoproterozoic Jingshan Fenzishan group, are metasomating and remelting and formed the S type Linglong granite; the Guojialing granite composed of crust mantle mixed magma during in the process of formation and emplacement are remelting explain the part material Linglong granite and intruded in the Linglong granite. The author believes that the 2573.4~2194.4 Ma is Jiaodong crystalline basement age information, 164.8~147.8Ma on behalf of the Linglong granite formation age, and 126.2~126.6Ma represents the Guojialing granite formation age information. This age combination information also reflects the geochronology records from the formation of Archean continental block, Paleoproterozoic cratonization to collision of North China block and the Yangtze block during Triassic to the exquisite S type granite formation, Guojialing crust mantle mixed type granites in Jiaodong area. Also, it concentrates the evolution process of the origin and evolution during the Mesozoic Magmatic in the Jiaodong area, and provides new data for the deep magmatic processes. Besides, this would improve our understanding of processes of Au deposits with several metallogenic stages.

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LI Hongkui, LI Dapeng, GENG Ke,, GUO Baokui, ZHUO Chuanyuan, LIANG Taitao.2017. The Mesozoic Magmaticactivities Framework in Jiaodong Area:SHRIMP Chronology Recording of Single Particle Zircon[J]. Acta Geologica Sinica,91(1):163-179

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History
  • Received:June 01,2016
  • Revised:December 12,2016
  • Adopted:January 12,2017
  • Online: January 16,2017
  • Published: