Research On Sedimention-Tectonic Alteration Mineralization Features Of The Polymetallic Mineralization Belt In Ankang Area, Southern Qinling

Basing on minernal surveying (scale at 1:50000) of Xunyang-Baihe area (2006-2008) and gold field struct project,rapid evaluation of TieFo in Hanyin-Liufang in Hanbin area (2010) of Ankang in ShaanXi provience. The Author study on deposition-tectonic dynamic alteration mineralization features of the polymetallic mineralization belt in this area. Through reaearching,measureing,sketching and photographing in this are,discussed sedimentary strata and environment, important deposition and tectonic event, hydrothermal sedimentary mineralization, major deformation style as well as deposition characters in this area, the author acquires some viewpoint, as follows:1. According to three years of resrarch of the project above,original Cambrian-Ordovician Donghe Group is divided into the lower Cambrian Lujiaping Formation, Cambrian Jianzhuba Formation, Ordovician Donghe Formation and the upper Ordovician-lower Silurian Banjiuguan Formation by making use of basin analysis theory,strata ording of Shan'xi province and former investigation.2. The deformation in HanYin is stronger than XunYang-BaiHe area. Some area is even more complicated, showing multi-phase deformation. The region has experienced three ductile deformations. The first phase of deformation is plastic solid-state deformation under the system extension. This deformation as So for fold foliation, forming S1 foliation. The second phase of deformation is toughened crust deformation under compression, as S1 for fold foliation, forming S2 foliation and ductile shear zone. The last deformation is as S2 for fold foliation, forming wide fold and S3 foliation;3. In strata and lithology, the place of tectonic deformation stronger of Silurian Meiziya formation, particularly near the DSZ, where is ore-forming hydrothermal fluid transporting and enriching. Therefore, RF5 is an important ore-controlling structure of for gold in this region;4. In addition, layered,lumped albitite, chert, also have some indicative,which is associated with lead-zinc deposit instudy area. They are signs of hydrothermal sediments, which is the major mineralization way of lead-zinc deposit. Therefore, hydrothermal sedmention rock is also a direction of looking for lead-zinc deposit; 5. Huanglong gold deposit and Luming gold deposit exist lower Silurian MeiziYa Formation and controlled by DSZ(RF5),which belong to the deposit of ductile shear zone;6. Most deposits of Xunyang lead-zinc deposit exist in lower Silurian MeiziYa Formation associated with hydrothermal sedimention of layered,lumped albitite and chert. At the same time, they located in fault,controlled by wings of fold and shear fault.Its structure overlap is parent and belong to hydrothermal deposition-tectonic alteration. Zhanghe magnetite exist in middle Devonian Shijiagou Formation,related to hydrothermal deposition wall rock,and controlled by Lvhe-Maoping and Shenhe fault,which is belong to hydrothermal deposition-tectonic alteration.