| Sichuan province Huili country ChaHe tangjiawan tin ore is located in the the western margin of Yangzi platform and anning river fault zone on the east side,the layer is a set of shallow sea to littoral facies miogeosyncline volcanic sedimentary rock combination.Huili district has experienced jining-chenjiang period of large-scale,high frequency basic and acidic magmatism and mineralization,has brought the rich ore-forming materials such as tin,iron,copper,possessing good ore-forming geological conditions.Through the field geological mapping,the measured section,the recording drilling,the sampling analysis,the geological characteristics and the characteristics of the ore deposit are studied in detail,and getting the following conclusion:(1)The layer,having ore body,is the second segment of the tianbaoshan formation,and the contact zone of the metamorphic sandstone,the non-pure marble and the biotite granite is the favorable part of the deposit output.The ore body is deposited in the interfacial layer of different lithology layers,and it is produced in a similar layer and lens.The characteristics of biotite granite,such as rich alkali and potassium,lacking magnesium and calcium,indicating that the rocks belong to the overmuch aluminum and rich potassium calcium,alkalinity-basalt series.Main elements and rare earth elements characteristics of the biotite granite reveals rock material mainly comes from the mudstones on crustal remelting,granite formation environment for intraplate environment.(2)The chahe anticline and secondary near EN anticline,which controlling the stratum and ore body.The weak zone of sliding surface and fault fracture zone of different lithologic layers provide favorable conditions for the flow of liquid of containing ore and deposit of metallogenic materials.After the formation of the ore body,the fault can damage the ore body.(3)The structure of ore mineral is complex,ore mineral composition change is bigger,inner contact zone for simple skarn mineral assemblage,outside contact zone for complex skarn mineral assemblage.The analysis data shows that tin ore grade 0.3 ~ 0.8%,copper grade 0.2 ~ 1.0%,tin and copper grade change is larger.The ore mineral is associated with zinc,tungsten,silver and other beneficial components.Through the analysis of rare earth elements and sulfur isotopes,the metallogenetic material is derived from the biotite rock body,the second segment of the tianbaoshan formation,and the metamorphic diabase.According to the field geological survey,the distribution of the biotite granite is large,which is the main source of metallogenic materials for ore deposits.(4)At Xiaojiahuodi and Hejiawuji area has a large number of granite rock,The outer contact zone of granite and tianbaoshan layer is the main prospecting direction in the future.In the area of the Hejiawuji,the anticlinal structure is relatively developed,and a small amount of mineralization has been found,so selecting the area for target area. |
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