本文選題：東昆侖造山帶　切入點(diǎn)：加魯河中基性巖體　出處：《地學(xué)前緣》2017年06期

【摘要】：加魯河中基性巖體位于東昆侖造山帶東段,巖體邊部巖漿混合作用明顯,富含暗色環(huán)邊石英,是研究巖漿混合作用的理想地質(zhì)體。本文在詳細(xì)巖石學(xué)研究基礎(chǔ)上,對(duì)寄主巖(香加南山花崗巖基)-包體-包體捕虜晶-暗色環(huán)邊石英的礦物(黑云母和角閃石)進(jìn)行電子探針成分分析。研究表明,不同類(lèi)型黑云母的Fe~(2+)/(Fe~(2+)+Mg)比值基本一致,介于0.53~0.59,寄主巖黑云母的MgO含量較低(8.06%~8.29%),包體捕虜晶-暗色環(huán)邊的黑云母MgO含量較高(分別為9.38%~9.45%和9.25%~9.52%);不同類(lèi)型角閃石的(Ca+AlⅣ)較高,大于0.5,寄主巖角閃石具有較高的FeO~T含量(20.27%~21.01%)和較低Mg#值(45~47);包體-包體捕虜晶-暗色環(huán)邊的角閃石具有較低的FeO~T含量(分別為18.31%~19.49%、18.11%~18.90%和18.01%~18.43%)和較高的Mg#值(分別為50~54、52~53和55~60)。寄主巖的角閃石(為鐵淺閃石)和黑云母(為鐵質(zhì)黑云母)具殼型特征;包體-包體捕虜晶-暗色環(huán)邊的角閃石(為鎂角閃石)和包體-暗色環(huán)邊的黑云母(為鎂質(zhì)黑云母)具殼幔型特征。寄主巖和包體捕虜晶的角閃石具有近似的成分和結(jié)晶環(huán)境,顯示包體與寄主巖間存在成分交換。早期富水巖漿有利于磁鐵礦和鈦鐵礦結(jié)晶,使晚期結(jié)晶的暗色環(huán)邊礦物(黑云母和角閃石)具有較高的MgO含量和較低的FeO~T含量,以及最低的結(jié)晶溫度和壓力。
[Abstract]:The Jialuhe Middle basic Rock body is located in the eastern part of the East Kunlun orogenic belt. The magma mixing at the edge of the rock body is obvious and rich in dark ringed quartz, so it is an ideal geological body to study magmatic mixing. The electron probe analysis of minerals (biotite and hornblende) of host rock (Xianggananshan granite base, inclusion-xenocrystalline enclave quartz) shows that the ratios of different types of biotite are basically the same. Between 0.53 and 0.59, the content of MgO in the host rock biotite is lower than 8.06 and 8.29. The MgO content of xenocrystallite and dark ring is higher (9.38% and 9.52%, respectively), and that of different types of amphibole is higher than that of other types of hornblende. More than 0.5, the host hornblende has a higher FeO~T content (20.277.01) and a lower Mg# value (454.47%), a lower FeO~T content (18.31% 18.1118.90% and 18.01% 18.4343) and a higher Mg# value (505452% and 556060) for hornblende on the side of the xenocrystalline and dark ring. The hornblende (iron shallower amphibole) and biotite (ferric biotite) of the main rock are crustal; The hornblende (magnesium hornblende) and biotite (magnesia biotite) on the enclave enclave xenocryst and dark color ring edge are characterized by crust-mantle type. The amphibole of host rock and enclave xenocryst has similar composition and crystallization environment. The results show that there is an exchange of composition between the xenoliths and host rocks, and the early water-rich magma is favorable to the crystallization of magnetite and ilmenite, which results in a higher MgO content and a lower FeO~T content in the late crystallized dark rimmed minerals (biotite and hornblende). And the lowest crystallization temperature and pressure.
【作者單位】： 長(zhǎng)安大學(xué)地球科學(xué)與資源學(xué)院西部礦產(chǎn)資源與地質(zhì)工程教育部重點(diǎn)實(shí)驗(yàn)室國(guó)土資源部巖漿作用與找礦重點(diǎn)實(shí)驗(yàn)室;南陽(yáng)理工學(xué)院土木工程學(xué)院;中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;山西師范大學(xué)地理科學(xué)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41472191,41502191,41172186,40972136) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)資金項(xiàng)目(310827161002,310827161006) 青海省國(guó)土資源廳-中國(guó)鋁業(yè)公司公益性區(qū)域地質(zhì)礦產(chǎn)調(diào)查基金項(xiàng)目(200801)
【分類(lèi)號(hào)】：P57;P588.1
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本文編號(hào)：1700624