北山地区照壁山南A型花岗岩地球化学特征及构造意义
Geochemical Characteristics and Tectonic Significance of A-type Granite in the South Margin of Zhaobishan, Beishan Area
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摘要: 侵入到红柳河蛇绿岩中的照壁山南黑云母二长花岗岩,其SiO2含量为68.86% ~ 73.27%,具高碱略富K贫Na,(K2O+Na2O=7.03 ~ 7.98,K2O/Na2O=1.16 ~ 1.36),AI含量中等(Al2O3=13.75%~14.1%)、弱过铝质(A/NKC=1.03 ~ 1.07)的特点,属高钾钙碱性系列弱过铝质花岗岩类.岩石具较高的Ga×104/Al(5.22 ~ 6.48)和Y/Nb (2.71 ~ 3.43) 值,在原始地幔标准化图解上显示出K、La、Nd、Zr、Hf、Sm富集, Nb、Ta、Sr、P、Ti强烈亏损,轻、重稀土分异明显,(La/Yb)N=7.19 ~13.15,负Eu异常(δEu=0.82 ~ 0.84),REE配分曲线呈略右倾"海鸥型"型的特点.研究结果表明黑云母二长花岗岩是在早泥盆世后碰撞伸展环境下,早期俯冲的与岛弧有关的物质受到底侵幔源玄武岩浆的加热部分熔融后,而形成的A(A2)花岗岩.红柳河-牛圈子-洗肠井蛇绿岩带西段所代表的古洋壳在晚奥陶世—早泥盆世间闭合(446.4~404.8Ma),之后出现一个以挤压结束伸展开始为特征的动力学演化阶段,其转化时间可能在415~404.8Ma.Abstract: The biotite monzogranite, located in the south margin of Zhaobishan, was intruded in Hongliuhe ophiolite, which are characterized by high-K and calc-alkaline composition with SiO2 68.86%~73.27%, high alkali (K2O+Na2O=7.03~7.98), coupled with midium aluminum (Al2O3=13.75%~14.1%) and weakly peraluminous (A/NKC=1.03~1.07). These rocks have high ratios of Ga×104/Al(5.22 ~ 6.48)and Y/Nb (2.71 ~ 3.43) in trace elements, which also show evidently loss in Nb, Ta, Sr, P, Ti as well as the enrichments of K, La, Nd, Zr, Hf and Sm. They are also rich in LREE with (La/Yb)N=7.19 ~ 13.15, and negative Eu anomalies(δEu=0.82 ~ 0.84). The results indicate that this biotite monzogranite belongs to A(A2) granite, which was formed by partial melting of young oceanic crust and island arc after had being used to be heated by basaltic magma in the extensional environment of early Devonian. Represented by the west part of Hongliuhe-Niujuanzi-Xichangjing ophiolitic belts, the paleo-ocean was closed between the late Ordovician and early Devonian(446.4~404.8Ma). After that, there was a dynamical evolution which was characterized by the end of the squeeze and the beginning of stretch, with the conversion time may be around 415~404.8 Ma.
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Key words:
- Hongliuhe ophiolite /
- post-collisional /
- geochemistry /
- A-type granite /
- Bashan
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YANG Hequn, LI Ying, ZHAO Guobin, et al. Character and structural attribute of the Beishan ophiolite[J].Northwestern Geology,2010?????攩琺′愶氭??丨慩瑮甠牃敨?慮湥摳?漠牷楩杴楨渠?潮晧???瑨礠灡敢?杴牲慡湣楴琩攮猼?睲椾璎梏?瀬憋爥瓱椬挆疶沏愬牉?爘新暤敌犢旳溳挰攺?瓗潙‖珇濿痷瑂梩斄憘玚瓊攧爰溄??畉獛瑊牝愮泿楩憩寳?崲??漰測琲爰椨戴甩琺椶漰渭猶?琮漼??椾湙敕爠慆汵潳杨祥?慧測搠?偁敎瑇爠潃汨潵杮祹????㈠?????????????ち??戠牔??????乲卩???????佮??佮坤?奴???副?慩湣搠?坭??呩??????删??传牴楨来椠湥?潲晬?愠湓???瑲祩灡敮?杯牰慨湩楯瑬敩??攠硭灥敬牡楮浧敥渠瑩慮氠?捯潮湧獬瑩牵慨楥渠瑡獲孥?嵛??洮敍物楮捥慲湡??楐湥整牲慯汬潯杧楹猬琲???????????????ㄨ???至???扥牳??剷??卨?剅?剧????倠剡????剡???愮渼摢?圾侎劏?????刬???“??璢秳炳攰?柇狿憩渠楕琭敐獢?爌敍瘠楴玄楛瑊敝搮??慦玥猬攲猰猰洶攬渲琷?漳昩?愲?爳攭猲椱搶甮愼汢?猾潙畕爠捆敵?浨潥摮敧氬嬠?嵉??敩潮汢潡杯礬?????????金???????????扳牯???奩???乧??呯桦攠???瑣祯灮攠?杲牯慭渠楈瑯潮楧摬獩????牏数癨楩敯睬?潴晥?琠桩敮椠牅?潳捴挠畔物牡敮湳捨敡?愠湍摯?据桴敡浩楮捳愬氠?捯桲慴牨慷捥瑳整爠楃獨瑩楮捡獛?慝渮摁?獴灡攠捇略汯慳瑣楩潥湮獴?潡渠?瑩桮敩楣牡?瀲攰琰父漬渲朷攨渳攩猺椲猱嬳?崲???楩瑮栠潃獨????づ?????????????ㄠ????扲牡???央???举???栬敕淽椦挬慎沢?猬畉戮搗楱癿楗玄椠濊渐?濄暋?瑍桝攮???琗禬瀧敦?杈爾愬渱椹琹漰椮搼獢?￣灚敕瑏爠潇杵敯湺敨瑡楯挬?慈湅搠?瑵敯捱瑩漬渠楌捉?楈浯灮汧楣捨慥瑮楧漬渠獥孴?嵡??攠潐汬潡杮祴????????ど??????????扡牬???乧????圠?乥?奵?卡?????乩?????敳瑨?慮氠???敩灯汮敛瑍敝搮?浥慩湪瑩汮敧?獂潥畩牪捩敮?映潕牮?瑶桥敲?啩汴畹渠材畵牢?剩楣癡整物???琱礹瀹攰?朠狑慣滽椬琴旰猶?映犇漬浉?丗潱爰琺栈?塱椭渗檠榕懇滿枩?‰?栖楦湹憁??朐斯澃捛桊敝洮椰猨瑦犥礬′愰渱搲?丸搶?匶爩?椹猶漱琭漹瀷椱挮?敢癲椾摚效湅捎敇??慯湮摧?極浯瀬氠楗捕愠瑔楡潩湲獡?昬漠牚?瑁桎敇?偗桥慮測攠牥潴稠潡楬挮挠片略獯瑣慨汥?杩牣潡睬琠桃孨?嵲???桥敲浩楳捴慩汣??敡潮汤漠杔祥??????ㄠ???????ㄠ????扯牦??佨乥传偙???佡??????卩??????卩??吠??乨乩?剬?整瑥?慩汮???敥爠捂祥湩楳慨湡?瀠潁獲瑥?捛潊汝氮楁獣楴潡渠慇汥???瑧祩灣敡?杓物慮湩楣瑡攬猠′漰昱′琬栠攸??漨欶猩栺愠愹氶?刭愹渷朱攨??匠潃畨瑩桮敥牳湥?呷楩整湨?卅桮慧湬???礠牡杢祳穴獲瑡慣湴嬩?崼??椾琠桃潃猬??ば?????????????れ???や??扮牐???丰??倏????圮??呦???‰??刬?????债倸??????圮??敲琾?慈汁???桙慵牡慮捹瑵敡牮椬稠慇瑕楏漠湚?慡湯摪?潥爮椠杁楣湣?潲晡?慥氠畃浯楮湳潴畲獡???瑯祮瀠敆?杲牭慡湴楩瑯敮猠?普牤漠浅?瑰桬敡??慭捥桮汴愠湁??漠汯摦??敯汮瑧??卵潨略琠桏数慩獯瑬敩牴湥??畂獯瑵牮慤污楲慹嬠?嵥??潯畮爠湂慥汴?潥晥?倠敘瑩牮潪汩潡杮祧?????????????????????扡牮???啴?堠???????乣????????乴?乯??????敁瑣?慡氠???慲牯汬祯?偩慣污攠潓穩潮楩捣??挲愰??????愴??攸挰氳漭朸椰琹攨獩?映牃潨浩??敳楥猠桷慩湴?丠坅??桬楩湳慨??慢湳摴?瑡档整椩爮?扢敲愾牨槽溆本?潵滺?琬桎攮?琮斅掙瓤漈湙楱揇?斩癹澁泊畢琐榄澄渠?潯昺‰球栖敦?獓潲甭瑎桤攠爌湍??斦湛瑊牝愮氰??獦椬愲渰‰估爬漠朲改渠椨挲??攱氰琸嬭?崱??漼畢牲渾慚汈?潕映??獯楱慩湮??愠牚瑈桁?匠捊楩敡湮捸敩獮?㈠が?ㄠ????????ㄠ???????扥牲??啴卩???乯????乥?噙併乹?佳???????婩???整瑥?慦汲??吠桗敥?灴敥瑲牮漠李敥湩攠獍楯獮?潯晬???瑤礠灉整?洠慔来浣慴獯?晩牣漠浓?瑴桴敩??洺爠慇浥??慨獥獭楩晳??卹漠畡瑮栠敓牭渭??猠牉慳敯汴孯?嵩???潯畮牳湴慲污?潮晴?偛敊瑝爮漠汇潥杯祣??ねど?????????ㄠ????有??戠爱???丱?刹??????呩剮啥???啷???删??????周吠??乳?卲?散瑴?愮氼????灅教瑔版漠杍攬渠敓瑔楅捒?猠瑒甠摊礬?潁晌?慈湅潒牒漠杒攬湥楴挠?晬攮氠獔楨捥?浌慡杴浥愠瑐楲獥浣?業湢?瑩桡敮??物敭瑮慡挠敩潧畮獥?偵慳爠散獯業獰?牥楸測朠?捯潵浴灨汥敲确??乳慲浡楥扬椺愠??敩癤楥摮散湥挠敦?晲漠牣?浭楡硧業湡杴?潣昭?捹牰略猠瑳?慮湵摫?浴慯湩瑤氠敭?摮敺牯楤癩敯摲?捴潥洠灡潮湤攠湡瑬獫孡?嵩???楡瑮桩潴獥???でねち????????????代代??戳爱?倨?吭?伩??漰申挭攱′??????敃湏敌牌慉瑎楓漠湗?漠時?流敍瑓愠汓甬洠楗湈潉畔猀???琀礀瀀攀?最爀愀渀椀琀攀猀?戀礀?氀漀眀?瀀爀攀猀猀甀爀攀?洀攀氀琀椀渀最?漀昀?挀愀氀挀?愀氀欀愀氀椀渀攀?最爀愀渀椀琀漀椀搀猀嬀?崀??攀漀氀漀最礀?????????????????????戀爀?倀??刀??????????刀刀?匀?一???圀??吀?一?????????吀爀愀挀攀?攀氀攀洀攀渀琀?搀椀猀挀爀椀洀椀渀愀琀椀漀渀?搀椀愀最爀愀洀猀?昀漀爀?琀栀攀?琀攀挀琀漀渀椀挀?椀渀琀攀爀瀀爀攀琀愀琀椀漀渀?漀昀?最爀愀渀椀琀椀挀?爀漀挀欀猀嬀?崀??漀甀爀渀愀氀?漀昀?倀攀琀爀漀氀漀最礀??????????????????戀爀?儀唀????堀??伀?圀????圀?一???夀??????攀琀?愀氀??伀爀搀漀瘀椀挀椀愀渀?攀挀氀漀最椀琀攀猀?昀爀漀洀?琀栀攀??栀椀渀攀猀攀??攀椀猀栀愀渀???洀瀀氀椀挀愀琀椀漀渀猀?昀漀爀?琀栀攀?琀攀挀琀漀渀椀挀?攀瘀漀氀甀琀椀漀渀?漀昀?琀栀攀?猀漀甀琀栀攀爀渀??氀琀愀椀搀猀嬀?崀??攀琀愀洀漀爀瀀栀椀挀??攀漀氀漀最礀?? ?????????? ???? ??戀爀?匀伀一???????堀??伀?圀??????一??????攀琀?愀氀?倀爀漀瘀攀渀愀渀挀攀?漀昀?洀攀琀愀猀攀搀椀洀攀渀琀愀爀礀?爀漀挀欀猀?昀爀漀洀?琀栀攀??攀椀猀栀愀渀?漀爀漀最攀渀椀挀?挀漀氀氀愀最攀?猀漀甀琀栀攀爀渀??氀琀愀椀搀猀???漀渀猀琀爀愀椀渀琀猀?昀爀漀洀?搀攀琀爀椀琀愀氀?稀椀爀挀漀渀?唀?倀戀?愀渀搀??昀?椀猀漀琀漀瀀椀挀?搀愀琀愀嬀?崀??漀渀搀眀愀渀愀?刀猀攀愀爀挀栀?? ??愀?????????????????????戀爀?匀伀一???????堀??伀?圀??????一??????攀琀?愀氀??倀爀漀最爀攀猀猀椀瘀攀?愀挀挀爀攀琀椀漀渀愀爀礀?琀攀挀琀漀渀椀挀猀?漀昀?琀栀攀??攀椀猀栀愀渀?漀爀漀最攀渀椀挀?挀漀氀氀愀最攀??猀漀甀琀栀攀爀渀??氀琀愀椀搀猀???渀猀椀最栀琀猀?昀爀漀洀?稀椀爀挀漀渀?唀?倀戀?愀渀搀??昀?椀猀漀琀漀瀀椀挀?搀愀琀愀?漀昀?栀椀最栀?最爀愀搀攀?挀漀洀瀀氀攀砀攀猀嬀?崀?倀爀攀挀愀洀戀爀椀愀渀?刀攀猀攀愀爀挀栀?? ??戀??????????????戀爀?匀唀一?匀?匀?愀渀搀????伀一伀唀???圀?????栀攀洀椀挀愀氀?愀渀搀?椀猀漀琀漀瀀椀挀?猀礀猀琀攀洀愀琀椀挀猀?漀昀?漀挀攀愀渀椀挀?戀愀猀愀氀椀琀猀???洀瀀氀椀挀愀琀椀漀渀猀?昀漀爀?洀愀渀琀氀攀?挀漀洀瀀漀猀椀琀椀漀渀?愀渀搀?倀爀漀挀攀猀猀攀猀嬀?崀?匀愀甀渀搀攀爀猀?????愀渀搀?一漀爀爀礀???????愀洀最洀愀琀椀猀?椀渀?琀栀攀?伀挀攀愀渀??愀猀椀渀猀嬀?崀??攀漀氀?匀漀挀?匀瀀攀挀椀愀氀?倀戀氀椀挀愀琀椀漀渀猀??????????????????戀爀?吀??一?娀????堀??伀?圀????圀?一???夀??????攀琀?愀氀??匀琀爀甀挀琀甀爀攀??愀最攀??愀渀搀?琀攀挀琀漀渀椀挀?搀攀瘀攀氀漀瀀洀攀渀琀?漀昀?琀栀攀??甀漀猀栀椀猀栀愀渀?一椀甀樀甀愀渀稀椀?漀瀀栀椀漀氀椀琀椀挀?洀??????氀愀渀最攀???攀椀猀栀愀渀??猀漀甀琀栀攀爀渀洀漀猀琀??氀琀愀椀搀猀嬀?崀??漀渀搀眀愀渀愀?刀攀猀攀愀爀挀栀?? ??????????? ??????戀爀?吀?夀?伀刀?匀?刀??刀唀?一????刀????????一一?一?匀????攀琀?愀氀??刀愀爀攀?攀愀爀琀栀?攀氀攀洀攀渀琀?瀀愀琀琀攀爀渀猀?椀渀??爀挀栀攀愀渀?栀椀最栀?最爀愀搀攀?洀攀琀愀猀攀搀椀洀攀渀琀猀?愀渀搀?琀栀攀椀爀?琀攀挀琀漀渀椀挀?猀椀最渀椀昀椀挀愀渀挀攀嬀?崀???攀漀挀栀椀洀椀挀愀?攀琀??漀猀洀漀挀栀椀洀椀挀愀??挀琀愀????????? ?? ??????????????戀爀?吀唀刀一?刀?匀?倀???伀??一?????愀渀搀??伀刀刀?匀伀刀?刀?匀???攀爀椀瘀愀琀椀漀渀?漀昀?猀漀洀攀???琀礀瀀攀?洀愀最洀愀猀?戀礀?昀爀愀挀琀椀漀渀愀琀椀漀渀?漀昀?戀愀猀愀氀琀椀挀?洀愀最洀愀???渀?攀砀愀洀瀀氀攀?昀爀漀洀?琀栀攀?倀愀搀琀栀愀眀愀礀?刀椀搀最攀??匀漀甀琀栀??甀猀琀爀愀氀椀愀嬀?崀??椀琀栀漀猀?????????????????????戀爀?圀????一???????唀刀刀???????愀渀搀????倀倀??????圀???开琀礀瀀攀?最爀愀渀椀琀攀猀??最攀漀挀栀攀洀椀挀愀氀?挀栀愀爀愀挀琀攀爀椀猀琀椀挀猀??搀椀猀挀爀椀洀椀渀愀琀椀漀渀?愀渀搀?瀀攀琀爀漀最攀渀攀猀椀猀嬀?崀???漀渀琀爀椀戀甀琀椀漀渀猀?琀漀??椀渀攀爀愀氀漀最礀?愀渀搀?倀攀琀爀漀氀漀最礀????????????? ???????戀爀?圀唀???夀??匀唀一???夀??????????攀琀?愀氀????琀礀瀀攀?最爀愀渀椀琀攀猀?椀渀?渀漀爀琀栀攀愀猀琀攀爀渀??栀椀渀愀???最攀?愀渀搀?最攀漀挀栀攀洀椀挀愀氀?挀漀渀猀琀爀愀椀渀琀猀?漀渀?琀栀攀椀爀?瀀攀琀爀漀最攀渀攀猀椀猀嬀?崀??栀攀洀椀挀愀氀??攀漀氀漀最礀?? ????????????????????戀爀?堀??伀?圀??????伀?儀????圀?一???夀??????攀琀?愀氀?倀愀氀攀漀稀漀椀挀?洀甀氀琀椀瀀氀攀?愀挀挀爀攀琀椀漀渀愀爀礀?愀渀搀?挀漀氀氀椀猀椀漀渀愀氀?瀀爀漀挀攀猀猀攀猀?漀昀?琀栀攀??攀椀猀栀愀渀?漀爀漀最攀渀椀挀?挀漀氀氀愀最攀嬀?崀???洀攀爀椀挀愀渀??漀甀爀渀愀氀?漀昀?匀挀椀攀渀挀攀?? ? ??? ?? ????????????戀爀?夀?一?夀??????圀唀???夀????唀一??匀???攀琀?愀氀????栀礀戀爀椀搀?漀爀椀最椀渀?昀漀爀?琀栀攀?儀椀愀渀猀栀愀渀???琀礀瀀攀?最爀愀渀椀琀攀??渀漀爀琀栀攀愀猀琀??栀椀渀愀???攀漀挀栀攀洀椀挀愀氀?愀渀搀?匀爀?一搀??昀?椀猀漀琀漀瀀椀挀?攀瘀椀搀攀渀挀攀嬀?崀??椀琀栀漀猀?? ?????????????? ??
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