摘要
新疆萨吾尔地区发育大量二叠纪火山岩。通过研究该火山岩的稀土元素特征,并利用稀土元素与常量元素相关关系以及稀土元素协变关系判别图解,结合其区域地质背景和岩石学、岩石化学特征,判断该地区二叠纪基性、中性火山岩成岩过程以平衡部分熔融作用为主,分离结晶作用不明显,而中酸性火山岩成岩过程则受到部分熔融作用和分离结晶作用的共同影响。稀土元素地球化学研究为新疆准噶尔地区二叠纪后碰撞阶段的岩浆作用机理及地球动力学演化过程提供了重要证据。
A large quantity of Premian Volcanic Rocks are developed in Sawu＇er Region of Xinjiang. Based on the analysis of the REE＇s geochemical characteristics of the volcanic rocks, the correlativity of REE and major elements and diagrams of covariant relations of REE, and the research results of the regional geological setting, petrology and petrochemistry characteristics, it is inferred that the mechanism of formation of Premian basic and intermediate volcanic rocks is mainly the equilibrium partial melting, and the magmatic fractional crystallization is not significant, while the rock-forming process of medium-acid volcanic rocks is influenced by both the partial melting and the fractional crystallization. The REE geochemical research has provided the important evidence for the mechanism of the Premian post-collision stage and the geodynamical evolution process.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2007年第1期95-101,共7页
Journal of the Chinese Society of Rare Earths
基金
国家重点基础研究发展规划项目(2001CB4098)
安徽省优秀青年科技基金项目(04045063)资助
关键词
成岩机制
后碰撞火山岩
萨吾尔地区
新疆
稀土元素
mechanism of rock-forming
post-collisional volcanic rocks
Sawu＇er area
Xinjiang
rare earth elements
