昌樂地區(qū)新生代堿性玄武巖中剛玉、尖晶石巨晶巖相學(xué)、礦物化學(xué)特征
[Abstract]:Changle Shandong contains the largest gem-grade corundum-sapphire deposit in China. The boundary between macrocrystalline and basalt of Changle corundum is sharp, the edge is round, and the reaction ring edge of aluminum-rich spinel and titanomagnetite is developed along the edge of megacrystalline dissolution, which shows that it is the lithofacies characteristic of deep source xenocrystalline. The lithology, electron probe and LA-ICP-MS (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry) analysis of giant crystals and their reaction edge minerals can effectively reveal the genesis and evolution of corundum. The mineralogical chemistry and key element characteristics of Changle corundum group 2 (CL-1 and CL-2) and the ratios of key elements such as Ga / MgCr / Ga / Fe / Ti Fe / mg show magmatic origin, while the samples of CL-2 group obviously superimpose the characteristics of late melt metasomatism. The reaction edge spinel has the compositional characteristics of the transition from corundum megacrystalline to spinel megacrystalline, and the key element characteristics indicate that they are strongly related to each other. Spinel giant crystal is the product of corundum undergoing complex metasomatism. Changle corundum shows the chemical composition characteristics of crystallization in alkaline melt, which is probably due to aluminum-rich alkaline melt formed by low melting of metasomatic enriched mantle rock.
【作者單位】: 山東科技大學(xué)地質(zhì)科學(xué)與工程學(xué)院山東省沉積成礦作用與沉積礦產(chǎn)重點(diǎn)實(shí)驗(yàn)室;
【基金】:中國(guó)地質(zhì)調(diào)查局資源部“中國(guó)大型—超大型礦床成礦地球動(dòng)力學(xué)背景、過程和定量評(píng)價(jià)綜合研究”專題“魯西巖石圈結(jié)構(gòu)與深部過程探討”(編號(hào):1212011220928) 山東省自然基金(ZR2016DM04) 山東科技大學(xué)科研啟動(dòng)基金(編號(hào):2014RCJJ009)的成果~~
【分類號(hào)】:P619.28
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