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The Dongchuan due to China copper deposit, Kunyang Group characteristics people breccia and his relationship with mineralization

Author: YaoFei
Tutor: HuangHao
School: Kunming University of Science and Technology
Course: Mineral prospecting and exploration
Keywords: Yinmin breccia Kunyang Group "Xikuangshan Type" iron-copper
CLC: P618.41
Type: Master's thesis
Year: 2010
Downloads: 61
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Abstract

Dongchuan copper deposit,which is a rift-type copper located in the "Kang-Dian axis" in the north of Yunnan section.In Kunyang Yinmin Group of Dongchuan Copper,hosts "Xikuangshan Type"iron-copper shaped by Volcanic-Sedimentary,beneath which often there is a layer of breccias；via the researching for the layer of breccia,we can interpret that the breccias was shaped by volcanic-sedimentary mineralization and we can also analyze the causes of breccias by the classification,which can play a supporting role in the formation of the stratigraphic division and also can provide an guidance for the seeking to "thin Mine Type" iron-copper.The"thin Mine Type"/The "rare mine-type" iron-copper found in Yinmin Copper mine of Dongchuan along with under the V section of breccia in Yinmin is a result of the focus of this paper.1.Via drawing the breccias spatial distribution of the project researched in which are found, it can simulate the paleotopography which was formed when ancient volcanic erupted and we can also infer the form of ore body.2.The iron patterns and the distribution of the thin copper mines is as same as the reccia in the section of Yinmin,on the top of which is covered tightly by the thin copper mines.The "rare mine-type" iron-copper distribution pattern is depended on the form of breccias.The distribution of the"rare mine-type" iron-copper breccias as well as the reccia in the section of Yinmin is the similar to a dome shape.The reccia in the section of Yinmin is wrapped by the "rare mine-type" iron-copper breccias.We can infer there will be a great exploration of space in the east of section of Yinmin.3.Through a systematic classification and an analysis of its causes of breccia in section of Yinmin,it can be divide into three types breccias which are the breccia formed by volcanism,deposition and tectonization.Based on researching the cause of Hydraulic Pressure Fracturing Breccia and after discussing the stratigraphic classification of Kunyang Group,which has been argued controversially for long time,we find that the breccia at the bottom of Yinmin Group is not was not due to a Large-scale Overthrust Structure；Yinmin Group together with its upper layers-Luoxue Fm,Heishan Fm and Qinglongshan Fm -and its underlayer-Pingdingshan Fm,Caiyuanwan Fm,Sahaigou Fm,Meidang Fm (called Four Underlayer Formations.)called Four Upper Layer Formations)is the nature stratum stromatolite relations.4.After the interval of the first volcanic eruption,because of a certrain degree of pressure from the fluid or gas to the underlying breccias,the rock strength around is weaken while brittleness will increase.When the pressure reaches a certain level,the rock will be broken into and form a breccias or rock fragments.Mineral fluid(Cu,Ag etc.)will also ascend along with the rock breaking gap,which offers the ore sources and channels for the formation of "rare mine-type"Iron-Copper mineralization and provides the essential conditions for mineralization.

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