Global Geology 2013, 16(1) 26-34 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
petrogenesis
geochemistry
riebeckite granophyres
southern Da Hinggan Mts.
Authors
WANG Jianguo
HE Zhonghua*
CHAO Lin
WU Qing and JIN Ling
PubMed
Article by WANG Jianguo
Article by HE Zhonghua*
Article by CHAO Lin
Article by WU Qing and JIN Ling

Petrogenesis of Early Cretaceous riebeckite granophyres in southern Da Hinggan Mts.

WANG Jianguo, HE Zhonghua* , CHAO Lin, WU Qing and JIN Ling

College of Earth Sciences,Jilin University,Changchun 130061,China

Abstract

This paper reports lithologic features,K--Ar age and geochemical data of riebeckite granophyres from Aliwula area in the southern Da Hinggan Mts.,aiming to reveal the petrogenesis of riebeckite granophyres. K-- Ar age of riebeckite granophyres is 126 ± 2 Ma,implying that the riebeckite granophyres formed in the Early Cretaceous. The granophyres are rich in riebeckites and with a lot of melt-fluid inclusion in its quartz phenocrysts. The granophyres are characterized by extensive enrichment in SiO2 ,FeO,and ( Na2O + K2O) and depletion in MgO and CaO,strong negative Eu anomalies and strong positive Ce anomalies. Additionally,the riebeckite granophyres not only have high total REE contents and display enrichment of HFSEs ( for example Zr, Hf,Nb,Ta) ,but also are strong in depletion of LILEs ( e. g. Ba,Sr) as well as high Ga /Al ratios. Primitive mantle-normalized REE pattern significantly displays REE M--W tetrad effect. REEs fractionate evidently and highly enrich in LREE,but are uneven distribution in the rocks. Taken together,we conclude that the riebeckite granophyres are similar to typical A-type granite,which could be derived from stretching environments in the Early Cretaceous. The granophyres originated from residual melt which underwent highly differentiation process, and were formed in magmatic-hydrothemal transition stage at last.

Keywords petrogenesis   geochemistry   riebeckite granophyres   southern Da Hinggan Mts.  
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