| 华北东部中、新生代岩石圈地幔的不均一性：来自橄榄石的组成填图结果 |
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| 引用本文： | 张宏福 英基丰 汤艳杰 张瑾 赵新苗 牛利锋 肖燕 苏本勋. 华北东部中、新生代岩石圈地幔的不均一性：来自橄榄石的组成填图结果[J]. 岩石学报, 2006, 22(9): 2279-2288. |
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| 作者姓名： | 张宏福 英基丰 汤艳杰 张瑾 赵新苗 牛利锋 肖燕 苏本勋 |
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| 作者单位： | 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室,北京100029 |
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| 基金项目： | 国家自然科学基金;杰出青年科学基金;国家自然科学基金 |
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| 摘 要： | 华北中、新生代玄武质火山岩和基性脉岩携带的地慢橄榄岩捕虏体中橄榄石和／或橄榄石捕虏晶系统的组成填图显示华北东部中、新生代岩石圈地幔存在明显的时空分布规律和不均一性。这与通过岩石圈地幔源基性岩石的地球化学反演获得的华北中生代岩石圈地幔的时空不均一性及其块体特征完全一致。太行山和鲁皖地区新生代岩石圈地慢的差异演化主要反映古老地幔橄榄岩与熔体相互作用时熔体性质和来源的不同。同时，橄榄石Fo填图还揭示了郯庐断裂对华北东部中、新生代基性岩浆活动及其岩石圈地幔演化的重要制约作用。而且，华北东部中生代岩石圈减薄后尚存古老岩石圈地幔残留。因此，华北东部岩石圈减薄的整体拆沉模式很难成立。
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| 关 键 词： | 中生代 新生代 橄榄石 组成填图 岩石圈地幔 华北东部 |
| 文章编号： | 1000-0569/2006/022(09)-2279-88 |
| 收稿时间： | 2006-02-20 |
| 修稿时间： | 2006-07-18 |
Heterogeneity of Mesozoic and Cenozoic lithospheric mantle beneath the eastern North China Craton: evidence from olivine compositional mapping |
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| ZHANG HongFu, YING JiFeng, TANG YanJie, ZHANG Jin, ZHAO XinMiao, NIU LiFeng, XIAO Yan ,SU BenXun. Heterogeneity of Mesozoic and Cenozoic lithospheric mantle beneath the eastern North China Craton: evidence from olivine compositional mapping[J]. Acta Petrologica Sinica, 2006, 22(9): 2279-2288. |
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| Authors: | ZHANG HongFu YING JiFeng TANG YanJie ZHANG Jin ZHAO XinMiao NIU LiFeng XIAO Yan SU BenXun |
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| Affiliation: | State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Systematical compositional mapping of olivines from mantle peridotitic xenoliths and/or xenocrysts entrained in basaltic rocks and mafic dykes from eastern North China Craton demonstrates that an apparently temporal and spatial distribution and heterogeneity exist in the Mesozoic and Cenozoic lithospheric mantle.This is entirely consistent with the temporal and spatial heterogeneity and block feature of Mesozoic lithospheric mantle beneath the eastern North China Craton as revealed by the geochemistry of the lithospheric mantle-derived mafic rocks.Different evolution of the Cenozoic lithospheric mantle between the Taihang Mountains and Shandong-Anhui regions mainly reflects the difference in the nature and composition of the melt involved in the interaction between the old refractory lithospheric mantle and the infiltrated melt.Simultaneously,olivine Fo mapping also reveals that the Tan-Lu Fault played an important role in both the Mesozoic and Cenozoic mafic magmatism and the lithospheric evolution in the eastern North China Craton.Furthermore,olivine composition indicates that there still exist some old lithospheric mantle remnants beneath the eastern North China Craton after the lithospheric thinning.Thus,tbe wholesale delamination model for the lithospheric thinning in the eastern North China Craton is difficult to reconcile the available data. |
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| Keywords: | Mesozoic Cenozoic Olivine Compositional mapping Lithospheric mantle Eastern North China Craton |
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