A Preliminary Framework For The Sequence Of Volcanic-intrusive Magma Of Relation To Mineralization In The North Wuyi Yanshanian Area

The magmatic rocks activity of Yanshanian period in North Wuyi Region isintensive and frequent,which have variety diagenesis mode,including intrusive andejection.Many metal minerals and important deposit type are related to the magmaticrocks activity.The magmatism in Early Yanshanian period was mainly intrusive rock，and this region devloped a series of volcanic basin of NNE by the end of the basein Wuyi Mountain uplift. And there are Tianhuashan volcanic basin,Huanggangshanvolcanic basin,Lizikeng volcanic basin and Xianxialing volcanic basin.This papertakes the volcanic-intursive rocks of Yanshanian period as the study subject to discusson the magma properties and genesis of volcanic-intrusive rocks in tihis regionwhich is closely related to mineralization.,and obtains following understangdings.(1) The magnism of Yanshanian period related to mineralization in North WuyiRegion can be mainly divided into three stages: magnism in170Ma was closelyrelated to skarn and porphyry copper deposit. Crustal magnism which was during165Ma to150Ma was related to Ag-Pb-Zn deposit and molybdenum mineralization.The magnism that was during145Ma to130Ma was in connection with molybdenummineralization and Sn-Pb-Zn-Ag mineralization.(2) The magmatic rocks of170Ma sre mainly intrusive rocks.It is beschtauite distributed in Tongshan-Chuankeng that is high-alkali，potash-rich，metaluminous-metaluminous.The SHRIMP U-Pb age of Zircon in beschtauite are170±1Ma, and171±1Ma.Then this paper conclude that the intrusive raok which is170Ma can be formed by sinking lower crustal material or melting of the mantle lithosphere of delamination continent.(3) The magnism of165Ma to150Ma were intrusive and ejection.Theintrusive rocks are biotite granite located in copper mine of Yongping, granite inZhoujia mine, granite in Lengshuikeng mine.And the granitic porphyries are belong tocalc-alkaline series,whose contents of SiO2are high.The characteristics of traceelements showthe formation of granite is the result of the partial melting of the earth’s crust. The extrusive rocks are mainly the volcanic rocks in the Daguding Group (J3d)of Tianhuashan volcanic basin, whose contents of SiO2change greatly, Al-rich. Theextrusive rocks are quasi-aluminous to strongly peraluminous, belonging to potassiummysterious quality to high-K calc-alkaline series.(4)The volcanic rocks of140-135Ma, whose contents of SiO2are high,belonging to acidic rocks,Al-rich, are metaluminous-metaluminous series.(5)The age of Daguding Group in Tianhuashan volcanic basin in North WuyiRegion is between158Ma with144Ma,and the age of volcanic rocks in E’hulingGroup is between144Ma with142Ma.The age of volcanic rocks in E’huling Groupin Huanggangshan volcanic basin is between131Ma wth138Ma.The age of volcanicrocks in E’huling Group of Lizikeng volcanic basin. The age of volcanic rocks inE’huling Group of Xianxialing volcanic basin ios138Ma。In total, the age ofvolcanism has the tendence to be new from west to east.