大兴安岭索伦地区安山岩与粗安岩的岩浆混合过程：矿物地球化学证据

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中图分类号：P588 文献标识码：A 文章编号：2097-5465（2025）03-0010-06

UniversityShijazhuang west

University，Xi'an 710069，China

Abstract：Thisstudyaimstoinvestigatethemagma mixingprocessanditsgenesis inandesitesanddacitesfromtheSuolunareain theGreatXing'anRange.Themineralogicalandgeochemicalcharacteristicsoftherockswereanalyzedtostudythemineral compositionoftheandesitesanddacites，andtheirreflectionofmagmaevolution.Theresearchmethodsincludechemical compostionanalysisofplagioclaseandpyroxeneminerals，focusingonthezonalcharacteristicsofplagioclasephenocrystsandthe compositionalvariations inpyroxene.Theresultsindicatethattheplagioclasephenocrystsintheandesitehaveacontentranging from38.71to59.7O，withsomeexhibitingclearoscilltoryzoning，sugesting magmamixing.Theandesitesanddacitesfromthe Suolunareaoriginatefromthemixingofintermediate toacidic magma withbasic magma.Asthetemperaturedecreases，plagioclase phenocrystsbegintocrystalie，andduringthesubsequentmagmaascent，thefllingofbasicmagmawithintermediate-felsic magmaresultsinmineralogical mixing.Thisstudyprovidesimportant mineralogical evidenceforunderstandingthemagma mixing processand itsgeological context in thisarea.

Keywords：volcanic rock；plagioclase；mineral chemistry；magma mixing；Great Xing'anRange

来稿日期：2024-12-02 DOI：10.13937/j.cnki.hbdzdxxb.2025.03.002

基金项目：河北地质大学博士科研启动基金项目（BQ2024040）；河北省战略性关键矿产资源重点实验室开放基金（HGU-SCMR2424，HGU-SCMR2425）；河北省自然科学基金资助项目（D2022403039）

作者简介：陈琛昌（2000—），男，浙江绍兴人，硕士研究生，主要从事岩石学与地球深部地球动力学研究。（剩余7800字）