Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第3期    总第156期    2012年3月

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文章编号:1004-0609(2012)03-0652-08
安徽月山岩体成岩机制
刘忠法1, 2,邵拥军1, 2,疏志明3,张  宇1, 2

(1. 中南大学 有色金属成矿预测教育部重点实验室,长沙 410083;
2. 中南大学 地球科学与信息物理学院,长沙 410083;3. 铜陵有色金属集团控股有限公司,铜陵 244000
)

摘 要: 从岩石学、岩石化学、稀土元素地球化学和微量元素地球化学特征入手,对形成月山岩体的岩浆来源、成岩环境以及岩浆的成岩作用过程进行分析;在此基础上,对本区月山岩体的成岩机制进行探讨。结果表明:本区岩浆主要来源于上地幔碱性玄武岩浆,成岩环境为岛弧及活动大陆边缘区,岩浆成岩演化过程中受到了上部地壳的同化混染,成岩机制为结晶分异和深部硅铝质同化混染及浅部弱钙质同化混染机制。

 

关键字: 月山岩体;稀土元素;地球化学;成岩机制;结晶分异;同化混染

Rock-forming mechanism of Yueshan intrusion,
Tongling, Anhui Province, China
LIU Zhong-fa1, 2, SHAO Yong-jun1, 2, SHU Zhi-ming3, ZHANG Yu1, 2

1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geoscience and Info-Physics, Central South University, Changsha 410083, China;
3. Tongling Nonferrous Metals Group Co., Ltd., Tongling 244000, China

Abstract:The origin of magma which formed Yueshan intrusion,the metallogenic environment and the diagenesis of magma were investigated based on the analysis of petrology, lithochemistry, trace elements and rare earth elements geochemistry. The diagenetic mechanism was discussed in this area. The results show that the magma rooted in upper mantle alkali basaltic magma, the diagenesis environment is the island arc and active continental margin areas, and the magmas experiences assimilation and contamination of the crustal materials to different degrees during the process of diagenetic evolution. The rock-forming mechanism is crystal fractionation combined with deep salic assimilationary- hybridization and shallow weak calcareous assimilationary-hybridization.

 

Key words: Yueshan intrusion; rare earth element; geochemistry; rock-forming mechanism; crystal fractionation; assimilationary-hybridization

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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