Geochemical Characteristics and Analysis of Tectonic Setting of Hannuoba Basalts from Chifeng Region, Inner Mongolia

Abstract:

The Hannuoba basalts from Chifeng region, Inner Mongolia, are continental flood basalt, produced by fissure-t type volcanism in the Miocene. The basalts chemically belong to the tholeiitic series. On the whole, the petrologic compositions are homogeneous. The basalts is characterized by Al₂O₃ = 11.5%~13.0%, Na₂O> K₂O and TiO₂=1.93~3.29%, chemically belong to the calc-alkaline series with low K₂O, which are the agpaitic type; The total amounts of REE of Hannuoba basalts are lower and rich in LREE. There is a weak Eu negative anomaly and weak Ce negative anomaly. The basalts are obviously enriched in incompatible elements (K, Rb, Sr, Zr, Ba, LREE etc.), and depleted in high field-strength element (U,HREE) as well as compatible elements (Co, Ni, Cr etc.).Comprehensive studies have shown that Hannuoba basalts erupted in a stable setting within continental plate and controlled by deep fracture crossed mantle, belonging to continental rift basalt.

• Periodical: Advanced Materials Research (Volumes 734-737)
• Pages: 340-343
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.734-737.340
• Online since: August 2013
• Authors: Yan Dong Peng, Zhi Bin Zhang
• Keywords: Chifeng, Continental Flood Basalt, Continental Rift, Hannuoba, Tholeiitic Basalt

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