大别山燕山期亏损重稀土元素花岗岩类的成因及动力学意义.pdf

Acta Sinica岩石学报 1000—0569／200I／017(04)一0551—64 Petrologica 大别山燕山期亏损重稀土元素花岗岩类的成因 及动力学意义’ 王强“2许继锋1赵振华1王人镜2邱家骧2包志伟1 WANG ZhenHualWANG andBAOZhiWei Qian91～，XU JiFen91．ZHAO RenJin92，QIUJiaXian92 1．中国科学院广，}|地球化学研究所，广州510640 2．中国埴质大学．武汉430074 lnstitut 510640，China 1．G蜘*h o，C-一htmistryt c^一Academy。，Sciences·Guangzhou 430074，Chin 2．ChinUniversity—Geosciences．Wuhan 3001—06—12收蕾，2001—09—10改回． andBao The of XuJF·Zko RJ·QiuJX ZW．2001 and HREE WmlgQt ZH，Wang petrogenesisgeodymualcsignificsnces Ymhaainthe Mountains．Acta during period DIbie PetrologicaSit“．ca，17(4)：55l一$64 depletedgraniteidB AINtractThe and characteristicsofYanshanian intheDabie in petrologicalgeochemical granitoids Mountains(mainly thattherearetwokindsofrocks YanshanianintheDabieMountains．Onekindis Zhang讪zuiarea)suggest among granitoids in and HREE clearlydepleted theotherkindshowsD．OHREEand Rb／Ba≤0．08)，and some and addition．the withtheHREEandY are A—type1-type depletion Rb／Ba0．08)．including granites．In granitoids furtherdividedintotwo andK—rich former011eissimilartoadakiticrocksandthelatterOne groups：Na—richgranitoids·the resemblesBa—Sr HREEand intheDabieMountainsweremost high granites．The Y—depletedgranites probablyproducedby otlowermaficrocksinthethickenedcrust(40km)duetothe marie thelower