伊通新生代玄武岩中辉石岩捕虏体的尖晶石成分分带

• 基础地质·矿产·盆地 • 下一篇

伊通新生代玄武岩中辉石岩捕虏体的尖晶石成分分带

贾大成¹,裴尧¹, 杜有实²,M. J. van Bergen³,H. van Roermund³

1. 吉林大学地球探测科学与技术学院, 长春 130026;2. 吉林省第一地质调查所, 长春 130033;3. 乌特勒支大学地球科学系，乌特勒支 3584CD，荷兰

收稿日期:2006-06-05 修回日期:1900-01-01 出版日期:2007-05-26 发布日期:2007-05-26
通讯作者: 贾大成

Compositional Zoning in Spinel in Pyroxenite Xenoliths from the Yitong Cenozoic Basalt，Northeast China

JIA Da-cheng¹,PEI Yao¹,DU You-shi², M. J. van Bergen³, H. van Roermund³

1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;2. The 1th Geologic Survey Institute of Jilin Province, Changchun 130033, China;3. Department of Earth Sciences, Utrecht University, Utrecht 3584CD, Netherlands

Received:2006-06-05 Revised:1900-01-01 Online:2007-05-26 Published:2007-05-26
Contact: JIA Da-cheng

摘要/Abstract

摘要： 伊通新生代玄武岩中存在3种不同成因的捕虏体，其中上地幔岩浆分异结晶形成的辉石岩捕虏体中尖晶石具有独特的成分分带。电子探针分析显示在尖晶石矿物的边缘富Al，而贫Mg 、Fe和Cr，矿物中心富Mg 、Fe和Cr，而贫Al，从中心向两侧基本对称。从尖晶石成分分带的元素分布特征判断，其形成不是固溶体相平衡过程中的离子扩散，而可能是化学平衡过程中结晶矿物与熔浆之间化学成分平衡的结果，属于化学平衡导致的成分分带。从尖晶石矿物中心到边缘的温度变化不能反映矿物形成后所经历的温度变化状况，与尖晶石共生矿物的二辉石地质温度计所能代表的地质意义是矿物中心的温度(~1 006℃)，反映矿物开始结晶时的温度状态。

关键词: 成分分带, 尖晶石, 化学平衡, 结晶温度

Abstract: The lherzolite, wehrlite and pyroxenite are the three types of xenoliths found in the Yitong Cenozoic basalt, Northeast China. The spinel in pyroxenite xenoliths has special compositional zo-ning.It is suggested that the pyroxenite xenoliths were formed by the crystallization differentiation of the differentiated mantle-derived magma. Based on electron microprobe analysis, the spinel is featured by symmetrical compositional zoning with Al increasing and Mg, Fe and Cr decrease from core to rim. According to the characteristics of element distribution, the spinel compositional zonings were formed by the chemical equilibrium between the crystals and magma during magma crystallization, not by ion diffusion in the processes of subsolidus equilibrium. The temperature difference from core to rim does not reflect the real temperature change after crystallization. The temperature in the center part of coexisted clinopyroxene and orthopyroxene can only represent the initial temperature of magma crystallization (~1 006℃).

Key words: compositional zoning, spinel, chemical equilibrium, crystal temperature

中图分类号:

P588.145

贾大成,裴尧, 杜有实,M. J. van Bergen,H. van Roermund. 伊通新生代玄武岩中辉石岩捕虏体的尖晶石成分分带[J]. J4, 2007, 37(3): 417-0422.

JIA Da-cheng,PEI Yao,DU You-shi, M. J. van Bergen, H. van Roermund. Compositional Zoning in Spinel in Pyroxenite Xenoliths from the Yitong Cenozoic Basalt，Northeast China[J]. J4, 2007, 37(3): 417-0422.

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