作　　者： ; ; ; ; ;

机构地区： 西北大学地质学系大陆动力学国家重点实验室

出　　处： 《西北大学学报（自然科学版）》 2012年第1期88-94,共7页

摘　　要： 目的探讨准噶尔盆地陆梁地区晚石炭世的构造环境,为限定准噶尔洋的最终闭合时间及进一步研究准噶尔盆地的构造演化提供理论支持。方法根据样品的化学分析数据,运用主量元素、微量元素和稀土元素进行分析。结果研究区火山岩主要为玄武岩,少数为流纹岩、安山岩和英安岩。玄武岩显示板内岩浆演化特征在火山岩构造环境判别图解中处于板内环境,大部分玄武岩Nb/Zr(>0.3)、Th/Nb(0.11～0.20)与陆内裂谷环境相当。结论准噶尔盆地陆梁隆起地区晚石炭世火山岩形成于陆内裂谷环境。 Aim To research the geological environment of the late Carboniferous epoch volcanic rocks in Luliang area, and to support the final closing time of Junggar Ocean and the geotectonic evolution in Junggar Basin. Methods Based on the samples＇ chemical analysis data, major elements, trace elements and REE, a research is made in Luliang area. Results The volcanic rocks in the study area are dominated by basahs with a small amount of rhyolites, andesites and dacites. The basalts show the characteristics of intraplate magmatic evolution, and the basalts are in the intraplate area on the diagram of volcanic rocks, the Nb/Zr ratios （ 〉 0. 3 ） and the Th/Nb ratios （0. 11- 0. 20） of most of the basahs are close to the continental rifting. Conclusion Carboniferous volcanic rocks from Luliang uplift in Junggar Basin are formed in the continental rifting environment.

关 键 词： 大陆裂谷 火山岩 地球化学 准噶尔盆地

领　　域： [天文地球] [天文地球]