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The Intrinsic Factors Causing the Significant Differences in Mesozoic Mineralization Between Jiaodong anf Luxi Areas

【摘要】:正Jiaodong and Luxi areas are separated by Yishu fault.These two areas were put together at the end of Middle Jurassic owing to the Large-scale sinistral translative motion of Tan-Lu fault.The mineralization of gold -polymetallic ore deposits in the above two areas took place in the Early Cretaceous.But there are the significant differences in mitallogenic scale,the ore deposit types and metallogenic mechnisin between Jiaodong and Luxi areas.A comparative study shows that Luxi area is located within the North China Plate and Jiaodong area in the margin of the North China Plate for a long time.It should be pointed out that Jiaodong area had undergone following complex tectonic environments and geological prosess:the Precambrian complex geological process,The Early Palaeozoic oceanic-continental crustal subduction anf collision orogeny,the Late Palaeozoic slow uplift,the continental-continental crustal subduction and intensive compression from Late Indosinian to early Yanshan periods,as well as the Late Yanshan lithosphyre thinning and large-scale tectonic magmatic activities.It is proposed that the subduction of the Kula-Pacific Plate beneath the Euro-Asia Plate and the intensive activities of Tan-Lu fault zone are the important dynamic conditions resulted directly in sudden occurrence of large-scale mineralization in the Early Cretaceous in Jiaodong area besides the above comprehensive geological structural factors.

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