Geochronology And Geochemistry Of Granitoids And Dikes In Quanzhou-Jinjiang Area

South China plate with its large number of Mesozoic magmatic rocks by thegeological community development and widespread concern, for such large quantitiesof magmatic rocks genetic interpretation, structural model has been inconclusive. Thispaper selected Quanzhou-Jinjiang eastern region Tongan rock outcropping of graniteand diabase emplacement which-pyroxene diorite dykes as the research object, itspetrology, geochronology and geochemistry studies and discussion, try to geologicalproblems within the region to explore the core to provide clues and evidence.Quanzhou-Jinjiang District granite samples biotite granite, biotite granite, SiO2content of67.2-74.4%, Al2O3content of13.3-16.7%, K2O content of1.34-4.91%,belonging to high-K calc alkaline series; Mg#ranged from26.5to40.2between, A/CNK ranged from0.97to1.09are weakly peraluminous type; mafic rock sampleslithology is mainly diabase, pyroxene diorite rocks, SiO₂content is51.61%⁵7.78%,Al₂O₃content of14.55-16.48%, K₂O content of1.31-2.47%, belongs to-Kcalc-alkaline series; Mg#ranged from49to68.1between, A/CNK varies between0.81to0.92are metaluminous type.Granite sample between the ages of105Ma to110Ma, εHf （t） is-1.88-2.03, thevast majority of small positive value, TDMis689-890Ma, TDMC1029-1320Ma inbetween; mafic dyke samples age of90Ma, εHf （t） between1.3to5.03, TDMis584Ma⁷11Ma, TDMCat834-1073Ma between mafic samples to be younger than theage pattern of granite samples.Sample as a whole showed LREE enrichment, HREE, granite sample （La/Yb） nin between11.46-44.56, ΣREE43.74²66.9in between mafic samples （La/Yb） n5.17¹2.69between, ΣREE content of64.7to188, most mafic samples have ahigher ratio of total REE granite samples from one side indicates a granite sample isnot Chinese and mafic samples from magmatic differentiation; enriched in Rb, Thand other large LILE, loss of Nb, Ta, Ti nature of high field strength elementscharacteristic. Quanzhou-Jinjiang District Tongan granite pluton preliminary inferred easternPacific plate subduction to a certain depth by dehydration resulting in the mantlewedge and the occurrence of wet explain partially fused to produce basaltic magma inthe lower crust, causing melting of the lower crust. Underplating process in the regionwas the extensive interaction between mantle crust, mafic dyke swarms in thesubsequent increase in extensional tectonic activity among intruding granite.