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Structure-Alteration-Mineralization Network of Xincheng Gold Deposit, Jiaodong Peninsula

Author: MaXueDong
Tutor: YangLiQiang
School: Chinese Geology University (Beijing)
Course: Mineral prospecting and exploration
Keywords: Metro gold deposits Structural Control of Ore Wall-rock alteration Mineralization network structure
CLC: P618.51
Type: Master's thesis
Year: 2011
Downloads: 160
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Abstract


The paper based on detailed geological investigation, the gold deposit ore-controlling structure, alteration zonation and mineralization network structure. Jiaojia main fault and its secondary fault structure is the gold deposits of the most important ore-controlling factors directly control the formation and distribution of the ore body. Due to the long-term evolution of the regional tectonic stress field, fault structure has undergone: the mineralization front ductile shear activities, mineralization early pressure ductile - brittle shear activities, the mineralization of compression and shear tectonic activity of tectonic activity and Zhang shear tectonic activity, the tensile constitutive activity in the post-ore five periods. The wall rock alteration fault structure, the horizontal direction with a clear zonation, but not a simple linear zonation. Altered rocks in the the Jiaojia fault zone footwall, independent fracture oriented a certain gradient trend: gouge → pyrite phyllic → phyllic → phyllic granite → silicification - potassium granite → fresh granite (-630m aboveMass balance calculation methods have been studied to the surrounding rock during hydrothermal alteration elemental mass migration. From fresh granite to a variety of altered rock: Si, Na, Al element to move out, Fe elements are mainly moved into, Ca, K elements both moved to vacate; trace elements Ba, Pb, Zn,Ba, Sr and more to move out, Pb, Zn and Cu multi-immigration. Metro gold deposits pyrite phyllic mineralization (I orebody) and lode mineralization (V orebody) is homologous mineralizing solution in the same structure under different tectonic (fault zone) parts of the product, is due to the different parts of the ore-controlling structure, level sequence level, caused by the differences in the nature: the gently inclined the pressure shear master fracture in strong tectonic activity, rock crushing strong, fluid infiltration metasomatism, development of altered rock type ore ; the Jiaojia main fracture secondary structure of the disk away from the main fault tenso main ore-forming fluid to fill the main conducive to forming mineral deposits formed sulfide quartz vein ore body. The Jiaojia fault structure with alteration and mineralization of with a good fit and unity was horizontal zonation with the main space. From the vicinity of the main fracture surface extruded sheet processing with to away from the cross-section of the joints with altered rock also pyrite phyllic zone to potassic zone, away from the cross-section of the type of mineralization fractured altered rock type mineralization brought to the quartz vein type mineralization with change.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Precious metals > Gold
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