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《阿拉善右旗庫(kù)和烏拉石英閃長(zhǎng)巖體地球化學(xué)特征及其地質(zhì)意義.pdf》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、礦物巖石地球化學(xué)通報(bào)BulletinofMineralogy，PetrologyandGeochemistry·研究成果·Vo1．31NO．2，Mmr．2012阿拉善右旗庫(kù)和烏拉石英閃長(zhǎng)巖體地球化學(xué)特征及其地質(zhì)意義蘇巧云，端木合順1．蘭州資源環(huán)境職業(yè)技術(shù)學(xué)院，蘭州730021；2．西安科技大學(xué)地質(zhì)與環(huán)境學(xué)院，西安710054摘要：阿拉善右旗庫(kù)和烏拉石英閃長(zhǎng)巖體位于塔里木一華北古陸塊與西伯利亞古陸塊之間的古生代褶皺帶，為探討其獨(dú)特的地質(zhì)意義，本文通過(guò)對(duì)庫(kù)和烏拉石英閃長(zhǎng)巖體的常量、微量和稀土元素成分分析和綜合研究
2、，系統(tǒng)討論了巖體的巖石地球化學(xué)特征、巖體的形成時(shí)代及大地構(gòu)造環(huán)境等地質(zhì)問(wèn)題。研究表明庫(kù)和烏拉石英閃長(zhǎng)巖屬于鈣堿性巖，巖體。Ar-Ar同位素測(cè)年結(jié)果為278．0士2．0Ma，形成時(shí)代為早二疊世。稀土元素球粒隕石標(biāo)準(zhǔn)化配分曲線為輕稀土略富集型，LREE／HREE為6．83～6．92，(La／Yb)N為7．23～7．29，3Eu=0．93～0．98，3Ce=0．90～0．91；大離子親石元素(Ba、Sr)和不相容元素(Zr、Hf)明顯的富集，與碰撞造山環(huán)境有關(guān)的鈣堿性巖石相似。研究認(rèn)為庫(kù)和烏拉石英閃長(zhǎng)巖體是在板塊碰
3、撞條件下形成干造山帶的深源巖漿演化產(chǎn)物，具備形成漿控型銅金礦的地質(zhì)地球化學(xué)條件。關(guān)鍵詞：庫(kù)和烏拉；石英閃長(zhǎng)巖；地球化學(xué)特征中圖分類(lèi)號(hào)：P588．122文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1007—2802(2012)02—0146—06GeochemicalCharacteristicsofQuartz-DioriteinKuhewulaRight—BannerAlxaanditsGeologicalSignificanceSUQiao—yun～．DUANMUHe—shun1．LanzhouResources&Envir
4、onmentEngineeringVoc—TechCollege，Lanzhou730021，China；2．GeologyandEnvironmentalEngineeringCollegeofXi'anUniversityofScience＆Technology，Xihn710054，ChinaAbstract：TheAlxaRight—bannerKuhewulaquartz—dioritelocatesinthePalaeozoicfoldbeltbetweenTarim—northernChinaa
5、ndSiberiaancientlands．Inordertoinvestigatethegeologicalsignificance，thispaperstudiedtherockgeo—chemicalcharacteristics，formationage，tectonicsettingfromtheanalysisofmajor，traceelement，REEcontentofKuhewulaquartz—diorite．Theresultsshowedthatthequartz—dioritebe
6、ingthetalc—alkalineseriesandtheagesofthequartz—dioritebeing278．0-_4-2．0MaformedinearlyPermianperiod，accordingto。Ar一Arisotopicdating．Chondrite—normalizedREEpatternsbeingLREEslightlyricher，LREE／HREE6．83～6．92，(La／Yb)N7．23～7．29，3Eu0．93～O．98，andc3Ce0．90～0．91．1ar
7、ge—ionlithophileelements(Ba、Sr)andincompatibleelements(Zr、Hf)beingenrichedandsimilartothecalc—alkalineseriesofactivecontinentalmargins．ThereseachresultsintheconclusionofKuhewulaquartzdioritebodyistheproductofmagmaevolutionwithindeep—sourceoforogenicbeltform
8、edintheconditionofplate—collisionwiththegeologicalandgeochemicalconditionsformingmagmacontrolledcopper—golddeposit．Keywords：Kuhewula；quartz—diorite；geochemicalcharacteristics阿拉善右旗庫(kù)和烏拉石英閃長(zhǎng)巖體位于阿拉善帶。(圖1)。
