Diagenesis Mechanism And Metallogenic Potential Ofintermediate-acid Intrusive Rock In Tongshan-Chuankeng,Jiangxi

Tongshang-Chuankeng intermediate-acid intrusive rock output in Qinzhou-Hangzhou metallogenic belt,Huaxia plate in the north west,is located in Pingxiang Guangfeng-Jiangshan-Shaoxing super shell deep fault zone north west.Single wall rock strata in the study area,the main development in north east to fracture,Triassic strata fold movement before and after indo-chinese epoch,forming a series of reversal,syncline double fold back.The main type of Tongshang-Chuankeng intermediate-acid intrusive rock is quartz flash and the porphyry of granite.Quartz flash porphyrite: the porphyrite is mainly made of plagioclase,amphibolite and alkaline feldspar,as well as a very small amount of black mica or quartz.The matrix elements are composed of microcrystalline long English and cryptocrystalline substances.Porphyritic porphyry: the porphyry consists mainly of plagioclase,alkali feldspar and quartz,and contains a small amount of amphibolite and black mica.The matrix is all-crystalline,consisting mainly of quartz and feldspar microchips.Quartz diorite porphyrite before granite diorite porphyry emplacement diagenetic in magma crystallization separation: quartz diorite porphyrite diorite porphyry and granite has obvious facies differentiation boundary;Roasting silicon on one side of the quartz flash of porphyry,which is in contact with the granites of the granite.Seen in the vein of quartz flash,the dike is inserted into the veins of quartz flash.The tectonic action of the two contacts only makes the quartz flash long porthole a mineral metamorphosis.Tongshang-Chuankeng intermediate-acid intrusive rock have A kind of arc geochemical characteristics,belong to general calcium alkaline aluminium-peraluminous granite series,CaO,K₂O and high low Na₂O,A/CNK value is less than 1.1,the terman index???is less than 1.8;Rich collection Rb,Ba,Th,and U etc.Large ioneurophilic elements?LILF?,strongly loss-making elements?HFSE?,such as Ta,Nb,and Ti.Heavy rare earth and rare earth,heavy rare earth,red rare earth,red rare earth,no obvious Eu negative,rare earth elements are divided into the right and the right.Tongshang-Chuankeng intermediate-acid intrusive rockis adakiteI granite type.Primary magma for thickening of the crust material Angle ShanLiu pyroxenite remelting formation,the formation of the neoproterozoic "inherit" the arc of the geochemical characteristics of rocks,magma source area is located in the earth's crust below 50 km,mainly for the residual phase hornblende,followed by garnet,and have stable rutile residual phase.The MgO# is generally low?average 0.41?,and the MgO,Ni and Cr levels are generally low,and the FeO/MgO is high,indicating that the native magma is very little mixed with the mantle olivine.At the same time,slightly higher than the continental crust's Nb/Ta?average 13.8?indicates that the heavy lava has a mantle material added.In ancient oblique subduction of the Pacific plate tectonic system of extruding relaxation stage,adakite magma formed by part of the thickening of the under earth's crustremelting through the process of the upper mantle joined the tiny mantle material,after the crust-mantle mixed source magma along the Pingxiang–Guangfeng-Jiangshan-Shaoxing deep fault that super shell migration towards the surface,along the north-south west to east in the shallow surface fracture and fold structure system,and rock weak plane shunt emplacement,eventually formed theband ofTongshan-Chuankeng intermediate-acid intrusive rock.Tongshang-Chuankeng intermediate-acid intrusive rocks diagenetic age was 171±1.6 Ma?n=15,MSWD=0.16?,when was almost the same as Dexing copper metallogenic rock diagenetic age 171±3 Ma,both have similar primary magma source,for Mr Tak type I granite type,have a kind of arc rock geochemical characteristics.In addition,the contents of the acid invadable rock Cu,Mo,Zn and other elements are much higher than the background value,mainly derived from diagenetic magma,which is similar to the source material of dexing copper ore.It shows that the acid intrusion rock in the research area has good mineralization.Tongshang-Chuankeng area with the porphyry copper metallogenic material source and the magma migration channel ore,lead ore and the space and the conditions of surrounding rock,the metallogenic condition is superior,the metallogenic potential is tremendous.