摘要
通过冀西北黄土梁金矿区成矿控矿构造的详细分析解剖,发现矿区成矿控矿构造为一铲状韧脆性剪切带。在该韧脆性剪切带上盘发育一系列与韧脆性剪切带呈入字型相交的近直立次级断裂。在一定的温度、压力等条件控制下,含矿流体沿韧性剪切带向上运移,并沿途萃取部分围岩中的成矿元素,在上盘断裂中沉淀、聚集成矿。因此,沿铲状韧脆性剪切带倾向方向深部仍有隐伏矿体,从深部布置的穿脉已打到新的盲矿体,且矿体厚大,前景可观。
Huangtuling gold deposit is celebrated for its wide, long mineralized zones, and closely spaced ore bodies. Deep-seated ore bodies were not drilled in this field, so deep-seated exploration land in a predicament. After analyses of ore-forming and ore-controlling structures, listric ductile shear zones with E-W strike, toward north with high-angle (80°～90°/ND85°) were found, The zones are main ore-forming and controlling structures in Huangtuliang field. A series of sub-first faults form on the hanging mall of the listric ductile shear zones, moreover the both intersect as small angle. The deep dissected ductile shearing zones link up deep ore-bearing fluids derived from mantle plume. Together with the magma, the fluids moved up along the ductile shear zone, and extracted some ore-forming elements in wallrocks. When oxidized precipitation met with reduced upwelling hydrothermal fluid in structural expending zone, the variation of the physicochemical state made Au, Ag precipitated and concentrated in favorable structures on hanging walls. The studies have shown the reasons for early exploration failure is that drill hole of toward N dip in south ore belts drilled under ductile shear zone. Because orebodies are deeply buried in the north ore zone, toward S dip drill hole merely drilling to shallow ore bodies, and drill hole drilling across the ductile shear zone do not find ore bodies too. Owing to understanding structures of ore-forming and ore-hosting, new blind and thicker ore bodies have been found in deep of the field. Thus, the field is imbued with good exploration prospects.
出处
《地质与勘探》
CAS
CSCD
北大核心
2003年第4期17-20,共4页
Geology and Exploration
基金
国家自然科学基金项目(编号:40272088)
教育部高等学校骨干教师资助计划(编号:J-2000-25)
中国科学院知识创新项目(编号:KZCX1-07)共同资助。
关键词
冀西北地区
黄土梁金矿
矿体预测
成矿控矿构造
ore-controlling faults, exploration prediction,Huangtuliang gold deposit,Northwest Hebei
