The Geological Environment of the Xenolith-Bearing Miocene Basalt from Siziwang County,  Inner Mongolia

Acta Scientiarum Naturalium Universitatis Pekinensis

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The Geological Environment of the Xenolith-Bearing Miocene Basalt from Siziwang County, Inner Mongolia

JING Xu, WU Tairan, HE Yuankai

School of Earth and Space Sciences, Peking University, Beijing 100871;

Received:2009-02-18 Online:2010-03-20 Published:2010-03-20

内蒙古四子王旗中新世含包体玄武岩的深部地质环境分析

荆旭,吴泰然,贺元凯

北京大学地球与空间科学学院, 北京 100871;

Abstract

Abstract: The xenolith-bearing Miocene basalts in Siziwang County, Inner Mongolia, are characterized with high-K (1. 16 %

Key words: xenoliths, Miocene basalts, lithosphere thinning, P-T equilibrium ranges, Siziwang County, Inner Mongolia

摘要： 内蒙古四子王旗东八号地区出露一套含深源包体的中新世玄武岩, 寄主岩石具有高钾( 1.16%< K O 含量 < 3. 36% ) , 高钛( 2. 25% < TiO2 含量 < 2. 51% ) 的特征; 其母岩浆富集 LREE 和 HFSE, 强烈富集 Nb, Ta 和 La, 相对亏损 K, Rb 和 Ba。其母岩浆来源于经历低度部分熔融, 残留石榴石和金云母的软流圈地幔, 运移过程中在高压环境下发生了分离结晶作用, 分异相主要为单斜辉石和斜长石。玄武岩中出现橄榄岩和麻粒岩包体:橄榄岩包体为尖晶石二辉橄榄岩, 富集 LREE, 平衡温压范围为:1050 ～1100℃, 1. 64 ～2. 37 GPa, 代表富集的或发生过富集事件的上地幔; 麻粒岩包体为中基性麻粒岩, 平衡温压范围为: 960 ～1000℃, 0. 82 ～1. 13 GPa, 其原岩包括原生的下地壳物质和与玄武质岩浆有关的产物。说明华北克拉通北缘的岩石圈受到地幔柱作用的影响, 中新世时处在减薄状态。

关键词: 包体, 中新世玄武岩, 岩石圈减薄, 温压条件, 内蒙古四子王旗

CLC Number:

P588

JING Xu,WU Tairan,HE Yuankai . The Geological Environment of the Xenolith-Bearing Miocene Basalt from Siziwang County, Inner Mongolia[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

荆旭,吴泰然,贺元凯. 内蒙古四子王旗中新世含包体玄武岩的深部地质环境分析[J]. 北京大学学报（自然科学版）.

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https://xbna.pku.edu.cn/EN/Y2010/V46/I2/215

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The Geological Environment of the Xenolith-Bearing Miocene Basalt from Siziwang County, Inner Mongolia

内蒙古四子王旗中新世含包体玄武岩的深部地质环境分析

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