Petrogeochemical Characteristics and Genetic Significance of the Aishan Pluton in Jiaodong Peninsula
详细信息
- 责任者：Yang Kuan (School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Wang Jianping
- 刊名：Geology and Prospecting
- 出版年：2012
- 卷期：50(4)
- 关键词：花岗岩 ; granite ; 山东 ; Shandong Province
- 页码：p.693-703
- 图表：5 illus., 2 tables, 46 refs.
- 分类号：0801
- issnNo：ISSN0495-5331
- isbnNo：CN11-2043/P
摘要
The Aishan pluton is located between the Qixia and Penglai cities in Jiaodong Peninsula.It mainly consists of monzogranites,and is a typical late Yashanian granite pluton.Petrochemical characteristics indicate that it is calcium alkaline granite with high silicon(Si2O=68.01~75.85),high potassium(K2O/Na2O>1),high magnesium and iron(MgO+Fe2O3+FeO+TiO2>2%),and metaluminium-peraluminium(A/CNK=0.916~1.012).It belongs to type-I granite,and originates from the crust.The LILE elements,including Rb,K,Ba and Sr,are significantly enriched,while depleted for those inactive HFSE elements including Y,Hf,Zr,Yb,Nb and Ta.Generally,the rocks display negative Nb and positive Pb anomalies.This may imply that the magma originated from upper mantle or lower crust with crust substance involved in.The light REE is apparently enriched with weak Eu anomalies.Correlation between SiO2 and ΣREE or δEu indicates it is mainly controlled by partial melting.Combined with tectonic background,the Aishan pluton has a very close relation with the suduction of lithosphere and the underthrusting of the ancient Pacific plate.Strong mantle metasomatism partial melting caused by asthenosphere upwelling is the main reason for the generation of the Aishan pluton.