西北地质2012，Vol.45Issue(3)：48-56,9.
西秦岭下拉地超基性岩体的地球化学特征及构造意义
Geochemical Characteristics of Xialadi Ultrabasic Intrusion of Western Qinling and Its Tectonic Significance
摘要
Abstract
The geological and geochemical characteristics of Xialadi ultrabasic rock of western Qinling were studied systematically in this paper. The results show that the characterization of Xialadi ultrabasic rocks is low SiO2> Mg rich and alkaline poor, in which metamorphic preexisting rocks belongs to the class of peridotite. The distribution of trace elements and rare earth elements (REE) among various rock types is different. The primary magma of Xialadi ultrabasic rocks originates from upper mantle, whose genetic type belongs to the mantle peridotite of subduction zone. Materials of crustal source and marine carbonate were added to Xialadi ultrabasic magma during its evolution, which resulted in the special geochemical composition characteristics of Xialadi ultramafic rocks with high A12O3 and CaO. In this paper, a preliminary discussion was carried out on the reasons of the differences in geochemical characteristics of Xialadi ultrabasic rocks due to the effects of alteration.关键词
下拉地/超基性岩/地球化学/岩浆成因/构造意义Key words
Xialadi/ ultrabasic rock/ geochemistry/ magma genesis/ tectonic implications分类
天文与地球科学引用本文复制引用
费一清,周贤君..西秦岭下拉地超基性岩体的地球化学特征及构造意义[J].西北地质,2012,45(3):48-56,9.基金项目
国家科技重大专项(2011ZX05008-00W-X0)、甘肃国土资源厅项目(1∶250000"岷县幅"地质矿产调查项目) （2011ZX05008-00W-X0）
