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《Journal of Guilin Institute of Technology》 2001-01
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Two kinds of large-scale fault structures and gold ore mineralization—An example from Pingxiang region

LIANG Jin cheng 1,CHEN Mao hong 2,FENG Zuo hai 1 (1.Guillin Institute of Technology, Guilin 541004,China;2.Guangxi No. 1 Geological Team,Guilin 541100,China)  
There are two kinds of large-scale fault structures in the southwestern Guangxi, one is the onward outspreaded imbricate Pingxiang thrust-nappe tectonics,with strike between 25°~40°, dip to SE, dip angle between 20°~30°, thrust direction towards 310±. It has an obvious zoning system with e =-33 3%. ε γ=66 7%, S 5 600 m, and it was formed as a result of the fault-thrust movement of the Indo-Chinese-Yanshan epoch. The other is Pingxiang-Dongmen fault.It stikes at 45°~80°and dips generally southward with dip angles between 50°~80°, it was a tension fault during the Hercynian epoch, and was transformed into a dextral strike-slip one during the Indo-Chinese-Yanshan epoch with a mixed product of mylonite-cataclasite. The results of the finite strain measurements show that k =1 5, γ =3~4, X∶Z =10∶1~20∶1, paleostress Δ σ is between 100~120 MPa. Gold ore is related to the stike-slip faults, with main faults directing the ore-forming flow while the secondary NE faults control the ore bodies. Gold ore mineralization is usually existed in the altered lava cataclasite, and T 1 medium-acidic volcanic lava is an important layer to look for gold ore deposits. Supergene oxidation helps secondary ore enrichment.The gold enrichment variation in the thrust-nappe tectonics is as follows:front zone 1 0×10 -9 ,middle zone 1 94×10 -9 ,root zone 2 18×10 -9 ,the value increases from the front zone to the root zone,and this will have to be paid attention to in our geological exploration around the root zones.
【Fund】: 广西自然科学基金!资助项目 (编号 :97170 0 1)
【CateGory Index】: P542;P618.51
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