Geochemical Characteristics and Genesis of Permian OIB-type Volcanic Rocks in Saga Region,Tibet
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摘要: 西藏萨嘎二叠纪火山岩主要岩石类型为强蚀变玄武岩和蚀变气孔-杏仁状安山岩。岩石学、岩石化学、岩石地球化学特征表明：曲嘎组火山岩高Ti（玄武岩、安山岩平均分别为3.16、2.15），高FeOT（平均分别为12.21、9.45），低Mg（平均分别为4.33、4.72），岩石化学特征表明其属于碱性岩系列。玄武岩、安山岩ΣREE分别为210×10-6~444.7×10-6、94×10-6~386.1×10-6，LREE/HREE分别为1.77~12.18、4.02~24.4，LaN/YbN分别为1.14~29.66、4.19~57.16。稀土元素配分曲线呈明显右倾型，微量元素蛛网图呈"隆起"型，具碱性玄武岩和洋岛玄武岩（OIB）特征。构造环境判别图解亦指示其为洋岛玄武岩（OIB），是地幔热柱或热点物质分异的结果，没有经历地壳混染，与此带中其余二叠系火山岩均起源于二叠系新特提斯裂谷作用，证实特提斯喜马拉雅从中二叠世之前就已经开始伸展裂陷。Abstract: The main types of Permian volcanic rocks are strongly altered basalt and altered stomatal-amygdaloid andesite. The study on petrology, lithochemistry, and geochemistryshows that these volcanic rocks have high Ti(basalt and andesite average in 3.16 and 2.15, respectively), FeOT(average in 12.21and 9.45, respectively) and low Mg (with the average values of 4.33 and 4.72, respectively) contents, which belong to alkaline series.The ΣREE, LREE/HREE and LaN/YbN of basalts are 210×10-6~444.7×10-6, 1.77~12.18 and 1.14~29.66, while the ones of andesites are 94×10-6~386.1×10-6, 4.02~24.4 and 4.19~57.16, respectively. The REE distribution curve shows a dipped-right pattern, while the trace element spidergram shows "uplift" type, with thecharacteristics of alkaline basalt and OIB. The tectonic environment discriminant diagram also indicates that these rocks belong to the oceanic island basalt (OIB), which areserved as the products of mantle plume or hotspot material differentiation,without any crustal contamination. The volcanic rocks are derived from the same source of Permian Tethys rift as the other Permian volcanics in this belt, testifying that the Tethys Himalaya began to rift before Permian.
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