Geochemical Characteristics and Geological Implication of the Acidic-Intermediate Dyke and Lava of the Major Cycle of Yixian Formation

详细信息   

• 责任者：Li Yongfei (Shenyang Institute of Geology and Mineral Resources ; CGS ; Shenyang 110034 ; China) ; Li Zhitong
• 刊名：Geology and Resources
• 出版年：2012
• 卷期：21(1)
• 关键词：岩脉 ; dikes ; 熔岩 ; lava ; 地球化学 ; geochemistry
• 页码：p.42-50
• 图表：7 illus., 1 table, 43 refs.
• 分类号：0801
• issnNo：ISSN1671-1947
• isbnNo：CN21-1458/P

摘要

 
    

The geochemistry and petrogenesis of the acidic-intermediate dyke and lava of the second cycle of Yixian Formation are studied. The result shows that the dykes have an average Mg^# value of 36.68, with average Na₂O/K₂O = 1.07. In trace element spider diagram, the dykes are characterized by enriched Rb, Ba and K and depleted Nb, Ta, P, Ti and Sr. In addition, the rocks present a pronounced negative Eu anomaly, overlapped LREE pattern with that of lava and a strong fractionation in HREE in chondrite-normalized REE pattern, with an average Y/Yb ratio of 10.1 and (Ho/Yb)_N = 1.13.