贛杭構(gòu)造帶靈山花崗巖體黑云母的礦物化學(xué)特征及其對(duì)巖石成因的指示意義
本文選題:黑云母 + 礦物化學(xué) ; 參考:《巖石學(xué)報(bào)》2017年03期
【摘要】:靈山花崗巖體在平面上為一環(huán)狀分布的侵入體,中心為角閃石黑云母花崗巖,外圍為黑云母花崗巖。在角閃石黑云母花崗巖中分布有大量的暗色鎂鐵質(zhì)微粒包體。黑云母是大多數(shù)中酸性火成巖中比較重要的一種鎂鐵質(zhì)礦物,它能很好地反映寄主巖漿的屬性和成巖時(shí)的物理、化學(xué)條件,因此,本文對(duì)這兩種花崗巖及鎂鐵質(zhì)微粒包體中的黑云母開展了系統(tǒng)的巖相學(xué)觀察和電子探針化學(xué)組成研究,探討靈山巖體的物質(zhì)來源、成巖條件和巖漿的混合作用過程。研究結(jié)果表明兩種花崗巖體的黑云母具有不同化學(xué)成分,而暗色鎂鐵質(zhì)微粒包體中黑云母的化學(xué)成分則變化較大。三種黑云母均在低氧逸度條件下晶出。兩種花崗巖中的黑云母均富Fe貧Mg,屬于鐵質(zhì)黑云母,含鐵系數(shù)[(Fe~(3+)+Fe~(2+))/(Fe~(3+)+Fe~(2+)+Mg~(2+))]分別為0.65~0.70,0.72~0.78,FeOT/MgO均接近7.04。MF值[2×Mg/(Fe~(2+)+Mg+Mn)]分別為0.64~0.76和0.48~0.60,指示兩種花崗巖的物質(zhì)來源都是以殼源為主。鎂鐵質(zhì)微粒包體中黑云母的MF值變化范圍比較大,為0.63~1.06,為鐵質(zhì)黑云母到鎂質(zhì)黑云母,暗示包體巖漿經(jīng)歷過不同程度的巖漿混合作用。鎂鐵質(zhì)微粒包體中部分黑云母與角閃石黑云母花崗巖中黑云母的結(jié)晶條件相似,而部分則有明顯差異,推測(cè)是由于基性的鎂鐵質(zhì)包體巖漿注入到酸性的花崗巖漿是一個(gè)連續(xù)多階段的過程。
[Abstract]:The Lingshan granite body is a ring distributed intrusive body on the plane with amphibole biotite granite at the center and biotite granite on the periphery. In amphibole biotite granite, there are a large number of dark magnesia-iron particle inclusions. Biotite is an important mafic mineral in most intermediate-acid igneous rocks. It can well reflect the properties of host magma and the physical and chemical conditions of diagenesis. In this paper, the biotite in the granites and magnesia-ferrite inclusions have been systematically studied by petrographic observation and electron probe chemical composition, and the material source, diagenetic conditions and magmatic mixing process of Lingshan rock mass have been discussed. The results show that the biotite of the two granites has different chemical composition, while the chemical composition of the biotite in the dark magnesium-iron particle package varies greatly. All of the three biotite were crystallized under low oxygen fugacity. The biotite of the two granites is rich in Fe and Mg-rich, and belongs to ferric biotite. The iron coefficient [(Fe3 Fe2) / (Fe3 Fe2 Mg2)] is 0.65 0.702.0.78FeOT / MgO close to 7.04.MF [2 脳 Mg2 / Fe2 mg mn] 0.640.76 and 0.48mg 0.60, respectively, indicating that the material sources of the two granites are mainly from shell source. The MF value of biotite in magnesium-iron microparticle inclusions varies from 0.63 to 1.06, indicating that the inclusion magma experienced magmatic mixing to varying degrees. The crystallization conditions of biotite in magnesium-iron particle inclusions are similar to those in hornblende biotite granites, but there are obvious differences in some of them. It is assumed that the injection of basic magnesia-iron inclusion magma into acidic granite magma is a continuous multi-stage process.
【作者單位】: 中國地質(zhì)大學(xué)地質(zhì)過程與礦產(chǎn)資源國家重點(diǎn)實(shí)驗(yàn)室;成都理工大學(xué)地球科學(xué)學(xué)院;
【基金】:國家自然科學(xué)基金項(xiàng)目(41403022) 中央高;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(CUGL150401)聯(lián)合資助
【分類號(hào)】:P588.121
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