文档介绍：1000-0569/2007/023(07)一1721-29 ActaPetrologicaSinica岩石学报新疆北部阿尔泰南缘晚古生代高钾高硅熔结凝灰岩的地球化学、岩浆成因及构造背景单强牛贺才于学元曾乔松 SHANQiang,NIUHeCai,YUXueYuanandZENGQia0Song 中国科学院广州地球化学研究所成矿动力学重点实验室,广州 510640 KeyLaboratoryformetallogenicdynamics,GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Guangzhou510640,China 2007-03--. ShahQ,NiuHC,。magmticgenesisandtect0IIicbackgroundofthe latepaleozoichighpotassiumandhifghsiliconignimbriteonthesouthernmarginofAltaid, Sin~a,23(7):1721—1729 Abstract Asuiteofhiigh-Kandhigh-SiignimbritehasbeenidentifiedintheLatePaleozoicvolcanicrockbeltonthesouthern KangbutiebaoFormationintheKelangandMaizivolcanic-. TheseHigh-Kandhigh—posedofK-feldspar(microcline),quartz,biotite, arecharacterizedbyperaluminous(K=~),highSiO2(69%~80%),highK20(5%~11%),andhighK2O/N% 0ratios;aswellasenrichedinLILEs(Rb,BaandK),anddepletedinHFSEs(Nb,TaandTi)withlowNb/ -mentionedfeaturesimplythattheyinheritedthecharacteristicsof continentalcrust,