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ID:33503992
大小:1.63 MB
页数:11页
时间:2019-02-26
《氧逸度综述,赵博》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、万方数据第33卷第5期2014年9月岩石矿物学杂志v01.33,No.5:955--964ACTAPETROLOGICAETMINERALOGICASep.,2014·综述与进展·对与氧逸度有关的花岗岩类成矿专属性一含矿性问题的再思考赵博,张德会,石成龙,张荣臻(中国地质人学地球科学与资源学院,北京100083)摘要:花岗岩类的成矿专属性与氧逸度密切相关,但氧逸度只是矿床形成时的必要非充分条件之。本文从成矿专属性和含矿性两个方面讨论氧逸度的成矿学意义,得到两点主要认识:还原性斑岩型Cu—Au多金属矿床具有高氧逸度成因,不同元素的矿化分别对应于氧逸度对演化程度、岩石类型、硫逸度、pH协变图上的
2、不同分区,其中可能以氧逸度和岩石类型这两种因素的配合最具专属性意义;从专属性到成矿性分从岩浆到热液、从热液到矿石两个阶段完成,这期间氧逸度对元素地球化学行为的影响不容忽视,但其在矿质沉淀过程中的角色有时不宜夸大,因为有的沉淀与氧逸度关系不大。关键词:氧逸度(fo);地球化学参量;花岗岩类;成矿专属性;含矿性中图分类号:P588.12+1;P611文献标识码:A文章编号:1000—6524(2014)05—0955—10Rethinkingofthemetallogenicspecializationandore-bearingpotentialofredox-relatedgranitoid
3、ZHAO130,ZHANGDe—hui,SHICheng—longandZHANGRong—zhen(CollegeofEarthScienceandResource,ChinaUniversityofGeosciences,Beijing100083,China)Abstract:Theore—formingmetallogenicspecializationoffelsicrocksiscloselyrelatedtooxygenfugacity.Inthispaper,however,oxygenfugacityisconsideredtobeoneofthenecessarybutn
4、otsufficientconditionsfororefor—marion.andtheanalyticalthinkingconcernedispartlybasedontheauthors’geologicalfieldwork.Themetallo—genicsignificanceofoxygenfugacityisdividedintometallogenicspecializationandore-bearingpotential.TwOaspectsofunderstandinghavebeenotained:①PorphyryCu—Audepositsderivedfrom
5、thereducedI-typegrani—toidshouldhaveahighoxygen.-fugacityorigin;differentsub—.regionswithinthecovariogramofoxygenfugacityversusothergeochemicalparameters,suchasdegreeofmagrnaticevolution,temperature,pressure,pH,sulfurfugacityandrock—type,correspondtodifferentmetals’geochemicalbehaviorormineralizati
6、on,respectively,andoxygenfugacityversusrock—typeseemstobeofsignificantspecialization;②Theevolutionfrommetallo—genicspecializationtorealmetallogenesisistheevolutionfrommagmatohydrothermalsolutionandthenfromhydrothermalsolutiontoore;duringsuchaprocess,oxygenfugacityisalsoanessentialcontrollingfactorf
7、orel—ementalgeochemicalbehaviors,whoseinfluenceonmineralprecipitation,however,shouldnotbeoverempha—sized,becausesomekindsofprecipitationmighthavehadnothingtodowithoxygenfugacity.Keywords:oxygenfugadty(厂O^);
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