Title: Establishment and Significance of Dextral Strike-slip Fault Ore-controlling System of the Laowan Gold Belt,Tongbai Mountains
Abstract: Focusing on the Shang Shanghe-Peng Jialaozhuang and Laowan-Sheng Laozhuang gold deposits of the Laowan gold metallogenic belt,Tongbai Mountains,the authors investigated the structural nature and assembly patterns of ore-controlling structural zone of the Laowan gold belt based on field investigation,mine channel observation,statistical analysis of fault attitude and assorting,and discussed the coupling between property of fault and mineralization type. The Shang Shanghe-Peng Jialaozhuang gold deposit has well-developed quartz vein type-mineralization,and its ore-controlling faults are characterized by R-type tension-shear fracture of Reidel shear structure,steep dipping northward,trending 290°~310° which strike at an angle of about +15° to the principal shear zone(286°),10 m of displacement by dextral strike-slip. The Laowan-Sheng Laozhuang gold deposit has altered rock type mineralization without quartz vein. Its ore-controlling faults are characterized by P-type compression-shear fracture of Reidel shear structure,gently dipping southward,trending about 92°,which strike at an angle of about 15° to the principal shear zone(286°),and dextral strike-slip is reflected by the right echelon arrangement of its three large fracture alteration belts. Integrating the information of faults and mineralization of the whole gold belt,we concluded that the ore-controlling fault system of gold belt is a braided dextral strike-slip shear zone by linkages between R and P shears of Reidel shear zone bounded by the Laowan and Songpa faults. Combined with the regional geological evolution of the Tongbai orogenic belt,it is proposed that the brittle shear zone of the Laowan gold belt was as a consequence of further development of early ductile shear zone,reflecting the dynamic mechanism of oblique collision between different tectonic blocks followed by uplift of the Tongbai orogenic belt. The coupling relationship between the dextral strike-slip fault ore-controlling system of the Laowan gold belt and gold mineralization provides important geological constraint on genesis of gold deposit.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 3
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