發(fā)布時(shí)間：2018-07-02 14:13

  本文選題：新生代玄武巖 + 捕擄晶　； 參考：《巖石學(xué)報(bào)》2017年08期

【摘要】：阿哲格爾火山湖玄武巖是位于卡帕多利亞火成巖省(CVP)東部的第四紀(jì)火山巖之一。與CVP中其他火山巖相比,玄武巖具有演化程度較低,成分上更接近原始巖漿的特征。玄武巖記錄了兩期深部巖漿活動(dòng):橄欖石捕擄晶Fo值高達(dá)89,尖晶石包裹體具有低Cr~#、高Al的特征,表明了早期巖漿源區(qū)可能為受俯沖板片流體交代的巖石圈地幔;除樣品TCA02外,玄武巖ΣCe/ΣY比值為1.39~2.11,~(143)Nd/~(144)Nd比值為0.51287~0.51288,Th/Nb比值為0.15~0.16,具有大陸裂谷玄武巖的特征,反應(yīng)了晚期的堿性巖漿起源于軟流圈地幔。與CVP早-中更新世鈣堿性巖漿相對(duì)比,晚期堿性巖漿的高場(chǎng)強(qiáng)元素(如Nb、Ta)具有弱的負(fù)異常,K、Ba等大離子親石元素富集程度較低,揭示了巖漿在上升演化過程中存在富集交代的巖石圈地幔物質(zhì)的加入。
[Abstract]:Ajagher volcanic lake basalt is one of the Quaternary volcanic rocks located in the eastern part of CVP. Compared with other volcanic rocks in CVP, basalts have a lower evolutionary degree and are more similar to the characteristics of primitive magma. Two periods of deep magmatic activity have been recorded in basalts: the Fo value of olivine is as high as 89, spinel inclusions are characterized by low Cr-#and high Al, indicating that the early magmatic source area may be lithospheric mantle metasomorphic by subduction plate fluid, except for sample TCA02. The 危 Ce- / 危 Y ratio of basalt is 1.39 ~ 2.11 ~ (143) ND / 144ND ratio of 0.51287 ~ 0.5128 ~ 8 / T / NB = 0.15 ~ 0.16, which is characterized by continental rift basalt, which reflects that the late alkaline magma originated from the mantle of the asthenosphere. Compared with the CVP calc-alkaline magma in the early and middle Pleistocene, the high field strength elements of the late alkaline magma (such as NbTa-Ta) have a low enrichment degree of large ion lithophile elements, such as the weak negative anomaly, such as Knaiba, and so on. It is revealed that there are enriched metasomatic lithospheric mantle materials in the process of magma uplift and evolution.
【作者單位】： 地質(zhì)過程與礦產(chǎn)資源國(guó)家重點(diǎn)實(shí)驗(yàn)室 中國(guó)地質(zhì)大學(xué)地球科學(xué)與資源學(xué)院;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃(2016YFC0600304) 國(guó)家“973”項(xiàng)目(2015CB452604) 國(guó)家自然科學(xué)基金項(xiàng)目(41273044、41225006) 中國(guó)地質(zhì)調(diào)查局工作項(xiàng)目(1212011121260、1212011121066) 長(zhǎng)江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃(IRT1083)聯(lián)合資助
【分類號(hào)】：P588.145

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本文編號(hào)：2090375