摘要
本文在研究海沟岩体地质、岩石化学、地球化学特征的基础上,对海沟岩体的成岩时代和成因进行了探讨。同位素结果表明,海沟岩体的就位年龄为167Ma-185.6Ma,属燕山早期第一阶段岩浆活动的产物;岩体稳定同位素特征分析、侵位特征以及稀土元素特征的研究,确定海沟岩体为幔、壳混源型。
Based on Haigou rock bodies lithogeochemistry,geochemical characteristics,the diagenetic epoch and genesis of Haigou rock bodies were studied in this paper.The isotopic age result shows that emplacement age of Haigou rock bodies is 167Ma-185.6 Ma,which belong to the early Yanshan,the first stage magmatic activity pro-duct.Through the analysis and study for isotope,emplacement and REE characteristics,it is definite that Haigou rock bodies belong to the mix mantle-crust type.
出处
《吉林地质》
2008年第2期1-4,共4页
Jilin Geology
关键词
海沟岩体
就位年龄
幔壳混源
Haigou rock bodies
emplacement age
mix mantle-crust source
