本文選題：LA-ICP-MS鋯石U-Pb年齡 + 巖石成因��； 參考：《礦物巖石地球化學(xué)通報(bào)》2017年02期

【摘要】：為探討青海都蘭縣溝里地區(qū)基性脈巖的成巖時(shí)代與構(gòu)造環(huán)境,理解早古生代東昆侖地區(qū)的地質(zhì)演化歷史,對(duì)溝里地區(qū)發(fā)育的色德日輝綠巖進(jìn)行了系統(tǒng)的巖石學(xué)、巖石地球化學(xué)和鋯石U-Pb年代學(xué)研究。巖石學(xué)觀察顯示,色德日輝綠巖蝕變強(qiáng)烈,但仍保留明顯的輝綠結(jié)構(gòu)。巖石地球化學(xué)分析表明,輝綠巖的SiO_2含量(45.70%~46.70%)與基性巖相當(dāng),屬亞堿性玄武巖系列;全巖的CaO含量較高(19.64%~21.50%),與碳酸鹽化、云母化等蝕變特征吻合;全巖稀土總量較低(64.53×l0-6~182.99×l0~(-6)),具有輕稀土元素富集特征,其δEu為0.80~0.96、δCe為0.84~0.92,均呈負(fù)異常;富集大離子親石元素(Rb、Th和U),而虧損高場(chǎng)強(qiáng)元素(Nb、Ta、Ti和Y)。全巖地球化學(xué)特征呈現(xiàn)島弧玄武巖特征。LA-ICP-MS鋯石U-Pb年齡為417.4±3.2Ma,形成于晚志留世。研究表明,色德日輝綠巖是俯沖板片的消減作用引發(fā)地幔物質(zhì)產(chǎn)生部分熔融的產(chǎn)物,其形成與晚志留世東昆侖地區(qū)古特提斯洋殼俯沖消減作用有關(guān)。
[Abstract]:In order to study the diagenetic age and tectonic environment of basic dikes in Guli area, Dulan County, Qinghai Province, and to understand the history of geological evolution in the East Kunlun area of early Paleozoic, a systematic petrology was carried out on the Sederi diabase developed in Goulan area, Qinghai Province.Geochemistry and U-Pb chronology of zircon.Petrological observations show that the diabase is strongly altered, but still retains a distinct phosphorescence structure.The petrogeochemical analysis shows that the SiO_2 content of diabase is similar to that of basic rock and belongs to the subalkaline basalt series, and the CaO content of the whole rock is higher (19.64% and 21.50%), which coincides with the alteration characteristics of carbonation and mica.The total amount of rare earth elements in the whole rock is relatively low (64.53 脳 l0-6n 182.99 脳 10 ~ (-1)), which is characterized by the enrichment of light rare earth elements (未 EU = 0.80 ~ 0.96, 未 ce = 0.840.92), and the enrichment of large ion lithophile elements RbTh and UB, while the depletion of high field strong elements NbTh and YU.The geochemical characteristics of the whole rock show that the island arc basalt features. LA-ICP-MS zircon U-Pb age is 417.4 鹵3.2 Ma.It was formed in the late Silurian.The results show that the diabase is the product of partial melting of mantle material caused by subduction plate subduction, and its formation is related to the subduction of paleoTethys oceanic crust in the late Silurian East Kunlun area.
【作者單位】： 中化地質(zhì)礦山總局云南地質(zhì)勘查院;中國(guó)科學(xué)院地球化學(xué)研究所礦床地球化學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;昆明理工大學(xué)國(guó)土資源工程學(xué)院;昆明理工大學(xué)資產(chǎn)管理處;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41272111) 山東黃金集團(tuán)基本科研業(yè)務(wù)費(fèi)專項(xiàng)基金項(xiàng)目(201122010100)
【分類號(hào)】：P588.124;P597.3

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