【摘要】 采用电子探针测试技术和晶体化学 成因分类图解法对南海东部表层沉积物中普通角闪石和磁铁矿的化学成分进行研究,结果表明,普通角闪石属于钙质角闪石组,主要类型有镁角闪石、钙镁闪石质角闪石、镁绿钙闪石质角闪石、浅闪石质角闪石、铁闪石质角闪石,均为中酸性岩浆成因。磁铁矿化学成分中TiO2、V2O5、Al2O3、MnO、MgO等标型组分的含量与岩浆成因的磁铁矿相似,其成因图解表明既有中酸性岩浆成因的也有基性岩浆成因的磁铁矿。普通角闪石和磁铁矿的成因性质与其共存的矿物特征和研究区的区域地质背景相吻合。更多还原

【Abstract】 Chemical composition of hornblende and magnetite in the surface sediments in the east of the South China Sea is studied by means of the electron microprobe analyses and crystallochemistry-genesis illustration. It is demonstrated that all of hornblende samples belong to the calcic amphibole group, varying from Magnesio-Hornblende, Tschermakitic Hornblende, Magnesio-Hastingsitic Hornblende, Edenitic Hornblende to Ferro-Edenitic Hornblende. They are derived from the intermediate-acidic magmatogenetic deposits. Contents of TiO₂,V₂O₅,Al₂O₃,MnO and MgO in magnetites resemble those from magmatogenic deposits. The crystallochemistry-genesis illustration shows that they are not only derived from the intermediate-acidic but also from the basic magmatogenic deposits. Genetic characteristics of both hornblende and magnetite in sediments are consistent with those of coexisting minerals as well as the geological background around the study area.更多还原