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《河北阜平雜巖長(zhǎng)英質(zhì)片麻巖中一些淺色體的地球化學(xué)性質(zhì)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、第28卷第7期地質(zhì)通報(bào)Vo1．28．No．72009年7月GE0L0GICALBULL1TINOFCHINAju1．，2009河北阜平雜巖長(zhǎng)英質(zhì)片麻巖中一些淺色體的地球化學(xué)性質(zhì)及其地質(zhì)意義任留東，楊崇輝，杜利林RENLiu—dong，YANGChong—hui，DULi—lin中國(guó)地質(zhì)科學(xué)院地質(zhì)研究所．北京100037InstituteofGeology,ChineseAcademyofGeologicalSciences，Bering100037，China摘要：阜平雜巖中的淺色體主要分為2種類型，早期淺色體基本沿片麻理分布，較富鉀長(zhǎng)石(微斜長(zhǎng)石)、石英，貧斜長(zhǎng)石．形成于低
2、水深熔或壓溶條件下，水含量較低，局部脫水但尚未達(dá)到整體脫水的程度；晚期淺色體切割現(xiàn)有的片麻理，較富斜長(zhǎng)石、石英，貧鉀長(zhǎng)石，形成于有水熔融條件下，平陽(yáng)奧長(zhǎng)花崗巖的出現(xiàn)即與晚期淺色體相對(duì)應(yīng)。南營(yíng)片麻巖、南營(yíng)淺色花崗片麻巖的地球化學(xué)性質(zhì)與其他片麻巖具有明顯的不一致性。淺色體的稀土元素配分型式較復(fù)雜，根據(jù)對(duì)元素相對(duì)富集或虧損的分析得知，大多數(shù)淺色體的形成受圍巖成分的控制，從早期淺色體向晚期淺色體發(fā)展，稀土元素含量向LREE相對(duì)虧損、HR_EE相對(duì)富集的方向轉(zhuǎn)化，某些微量元素有明顯的繼承性。與地球化學(xué)特征相比，礦物組合的確定對(duì)淺色體階段的歸屬判定更為重要。阜平雜巖變質(zhì)演化不是簡(jiǎn)單的進(jìn)變
3、質(zhì)脫水反應(yīng)，其水分含量的變化十分復(fù)雜，對(duì)其深入研究有助于更好地了解該區(qū)地質(zhì)和構(gòu)造的演化過(guò)程關(guān)鍵詞：淺色體；稀土、微量元素；地球化學(xué)；元素相對(duì)富集或虧損；阜平雜巖中圖分類號(hào)：P588．345；P595文獻(xiàn)標(biāo)志碼：A文章編號(hào)：1671-2552(2009)07-0857—10RenLD，YangCH，DuLL．GeochemicalfeaturesandgeologicalsignificanceoftheleucosomesinthequartzofeldspathicgneissesofFupingComplex，Hebei，China．GeologicalBulletino
4、fChina,2009，28(7)：857—866Abstract：TheleucosomesinthequartzofeldspathicgneissesofFupingComplexcanbediscernedtOtWOtypes．Theearliertypeisrichinmicrochne，quartz，butpoorinplagioclaseandessentiallyalignedalongthefohadon．Thisleucosomeisformedunderlow—wateranatexisorpressuresolution，locallydehydrat
5、edbuthasnotbeenuptOthedegreeoftotaldehydrationasawhole．Cuttingthefolition，thelatetypeisrichinplagioclase，quartz，butpoorinK—feldspar，andisderivedfromwater—presentpartialmelting．ThePingyangtrondhjemitemaycorrespondwichthisstage．ButtheNanyinggneissandleucograniteareinconsistentwithothergneisse
6、softheregioningeochemistry．TheREEpatternsoftheleucosomesareverycomplicated．Accordingtotherelativeenrichmentordeple—tionofelements，wecandeducethatmostleucosomesarecontrolledbythehostbulkchemistry．FromtheearlierleucosometOthelaterone，theREEtendtOberelativelydepletedinL1LEEandenrichedinHREE，an
7、dsometraceelementsmayinheritthefeaturesofthehost．RelativetOthegeochemicalfeatures，itseemsthatthemineralassemblagesoftheleucosomesaremoreimportantforthestageascription．ThemetamorphismevolutionoftheFupingComplexisnotsimpleprogressivedehydrationandthewaterc
