Geology and Metallogenic Geodynamic Setting of the Interlayer-sliding Tectonic Breccia type Gold Deposit in the Margin of the Jiaolai Baisin, Shandong Province
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    Abstract:

    In recent years, a new type gold deposit, Interlayer-sliding breccia type gold deposit, Such as Pengjiakuang, Dazhuangzi and Fayunkuang gold deposits had been discovered along the north margin of the Mesozoic Jiaolai Basin. The gold deposits locate in the margin of pull-apart basin, which controlled by the interlayer-sliding fault, a low- angle fault between conglomerate of Early Cretaceous Laiyang Formation and metamorphic rocks of Lower Proterozoic Jingshan Group. The fault occurs along the brittle rock stratum as marble in the extension tectonic dynamic setting of the eastern North China . The studies indicate that the fault is a tectonic breccia fault zone with lots of siliceous-marble tectonic breccias and cataclastic rocks. The interlayer gliding fault possesses the characteristics of low- angle, dip- slip, bed- zoned structure. The gold ore-body is controlled by main fault zone-tectonic breccia rock zone. The gold mineralization occurs in the cements of the siliceous-marble tectonic breccias and cataclastic rocks. The geology and S、C-O、H-O isotopes show hat the ore-forming material and fluid mainly origin the upper mantle and the lower crust, which exhibit feature of multiple sources for the meteoric water and the basin fluid. There exist strong fluid-wall rock interaction during the mineralization. The deep fluid extracted partial materials from the wall rocks to involve the mineral fluids circulating. The meteoric water and the basin fluid are important for the gold mineralization. The fault and gold mineralization are closely related to the tectonic-magma activities in the eastern China and the evolvement of the Jiaolai Basin in Mesozoic. The interlayer-slide fault is resulted from a secular evolution experiencing compression- extension- compression with the basin. The strong lithospheric thinning and strong extensional tectonic process of the Tanlu Fault create the large-scale fluid during Mesozoic, and the gold mineralization during Earlier Cretaceous is caused by the strong magmatic activity (particularly magmas of mantle sources), strong extensional tectonic process.

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zouweilei, yangjinzhong, zengqingdong, liguangming, zhanglianchang.2010. Geology and Metallogenic Geodynamic Setting of the Interlayer-sliding Tectonic Breccia type Gold Deposit in the Margin of the Jiaolai Baisin, Shandong Province[J]. Acta Geologica Sinica,84(4):508-517

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History
  • Received:November 09,2009
  • Revised:December 14,2009
  • Adopted:January 05,2010
  • Online: March 30,2010
  • Published: