豫西马超营断裂带的控岩控矿作用研究

A STUDY OF ROCK CONTROLLING AND ORE CONTROLLING ROLE OF THE MACHAOYING FAULT IN WESTERN HENAN

马超营断裂带是熊耳山南坡自中岳期形成后长期活动的ＮＷＷ向区域性深大断裂，是中元古熊耳群火山岩浆向上运移的通道和火山活动的中心。以及火山弧和弧前盆地的分界，并在中生代发展为大型陆内挤压俯冲带。表现为由南向北的Ａ型俯冲。它控制了熊耳群的形成和分布以及官道口群和栾川群的北界；造成了断裂带及其南北两侧岩石变形变质的差异；控制了熊耳山地区的岩浆和热液活动，使岩脉和热液蚀变沿断裂带发育，并使改造型花山－五丈山等花岗岩和同熔型斑岩－角砾岩在断裂带上盘或北侧由近到远分布，矿床分布显东西成带。

The Machaoying fault zone is the largest NWW trending regional deep fault on the southern slope of Xionger Mountain.Formed during the Zhongyueian cycle,it was long active and eventually turned into a large intracontinental compressional (Type A) subduction zone in Mesozoic.It played an important controlling role in rock forming and ore forming activity of Xionger Mountain area. In the course of the subduction of Qinling paleooceanic plate to northern North China paleocontinental plate in Middle Proterozoic,the fault zone became a passage where the magma formed by syntexis of oceanic crust subducted into the mantle migrated upward and finally grew to be the center of the volcanic activity.The fault zone controlled the regional metamorphism and dynamic metamorphism of Xionger Group within it and on its southern and northern sides.There are tight linear folds,greenschists and various dynamic metamorphic rocks within the zone.The fault zone,as the boundary between the Middle Proterozoic arc and the forearc basin,was located in the transitional belt between the uplift and the depession,controlled the northern boundary of Guandaokou Group and Luanchuan Group,and caused the formation of a series of tight linear NWW trending,northward dipping overturned folds and NWW striking thrust faults. Within the fault zone were formed multiperiodic and multi type dikes and hydrothermal alterations.The rock forming and ore forming substances derived from the Yanshanian northward Type A subduction,in particular,provided sufficient materials for the formation of different types of granite bodies,rock belts as well as related ore deposits and ore belts,and controlled their spatial distribution.In the study area,all this finds expression in the proximal→distal distribution of transformation series granites such as Huashan Wuzhangshan plutons and syntexis series granites such as porphyry breccias on the hanging wall or the northern side of the fault zone.The role of the fault zone and its derivative NE trending faults as the passageway of ore materials and in the distribution and storage of ores caused the spreading of ore deposits in zones in east west direction and in rows in northeast direction.