安徽石台地区中生代花岗岩类特征、成因与成矿专属性

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1、traceelementpatternsofthemareslightlytiltedtofightonthewhole，andshowRbenrichmentandBa,SrandTidepletion．ThesecharacteristicsaresimilartothoseofHuangshanandFulinggranitesinsouthAnhui．FortheKushanandWutangganggranodiorites，mostofthelithophileelementsarer

2、elativelydepleted，CuisenrichedbutWandSnarenot．TheK／Rbvaluesalehigh，butRb／Srvaluesalelow,Primitivemantle—normalizedelementpatternsofthemaretiltedtorightonthewhole，andallofthemshowthatNb，Ta,TiandYareobviousdepletedbutLaandTbareenriched．Thecharacteristic

3、softhemaresimilartothoseofthegranodioritesofTonglingarea,Anhuiprovince．5．Allofthesegranitoidshavetransitionalcharacteristicsof1-typeandS-type，butGuniujang(includingDongku)andTanshangranitesshowmainlythecharacteristicsofS-typegranite，whereas，KushanandW

4、utangganggranodioritesshowthecharacteristicsofI-typegranite；Theyaresyn-collisionalandpost-collisionalgraniteswhichmayformincompressionalandthetransitionalfromthecompressionaltostretchgeodynamicbackground；TheGurdujang(includingDongku)andTanshangrianite

5、sareproductsofearlyCretaceousmagmaticactivity,whereastheKushanandWutangganggranodioritesareproductsoflateJurassic--earlyCretaceousperiod；ThemagmasofGuniujang(includingDongku)andTanshangranitesareproductsofcrustpartialmelting，whereas，magmasofKushanandW

6、utangganggranodioritesmaycomefrommantleandmixcrustalmaterial；Thepartialmeltingtemperaturesofsourcerocksare>875"CfortheGuniujang(includingDongku)andTanshangrianites，whereas，thosefortheKushanandWutangganggranodioritesarehigherrelatively．Thedepthofmagmas

7、ourcesofGuniujang(includingDongku)andTanshangranitesare<40km,withpressure<1．2GPa；TheGuniujang(includingDongku)andTanshangranitesshowore-formingpotentialofWandSn，whereas，KushanandWutangganggranodioritesshowore—formingpotentialofAuandCu．Keywords：Mesozoi

8、cgranitoid；petrological，petrochemicalandlithogeochemicalcharacteristics；petrogenesisandminerogenicspecialization；ShitaiareaofAnhuiProvince插图清单图2．1研究区交通地理位置图⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯7图2．2下扬子地区构造单元划分及研究区位置图⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．8图2．3安徽晚元古代前基底结构图⋯⋯⋯⋯⋯⋯⋯⋯