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Peridotite-melt interaction: a key point for the destruction of cratonic lithospheric mantle
  • ISSN号:1001-6538
  • 期刊名称:科学通报(英文版)
  • 时间:0
  • 页码:3417-3437
  • 语言:中文
  • 分类:P3[天文地球—地球物理学]
  • 作者机构:[1]State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 China
  • 相关基金:Supported by National Natural Science Foundation of China (Grant Nos. 40534022 and 90714008) and the Chinese Academy of Sciences (Grant No. KZCX2-YW-103)This paper is the result of our research group and I thank all the researchers of our group for their works in recent years. The author also appreciates the invitation by Prof. Zheng Y. F. for this overview and the careful comments given by Profs. Gao S., Zheng J. P., Xu Y. G and another reviewer.
  • 相关项目:华北岩石圈地幔的破坏和重建过程:非传统同位素地球化学示踪
作者: Zhang HongFu|
中文摘要:

这篇论文给出从诺思中国 Craton 处理披风 peridotitic 捕虏体和 xenocrysts 的不同年龄的最近的研究的概述,与提供为诺思中国 Craton 的破坏上的进一步的学习的新想法的目的。Re-Os 同位素的研究建议北方中国 Craton 的球的披风具有在它的变瘦以前的太古代的年龄的石版印刷。为什么的关键原因如此的低密度和高度倔强的太古代的石版印刷球的披风将被变瘦是在石版印刷的作文,热政体,和物理性质的变化球的披风由于橄榄岩与的相互作用不同起源融化。有北方中国 Craton 的周 craton 盘子和碰撞的里面的 subduction 为 craton 的破坏提供了驱动力不仅,而且连续融化源于潜水艇 ducted 大陆人或导致了石版印刷的组合变化的海洋的外壳的材料的部分融化球的披风。在 ca 的地区性的热异例。120 妈导致了融化高度修改的石版印刷球的披风。同时或随后,在 welling 上面的球的扩展和 asthenospheric 推进的石版印刷增强了融化并且变瘦石版印刷球的披风。因此,破坏并且北方中国 Craton 变瘦是橄榄岩融化相互作用的联合结果(增加不稳定) ,提高的地区性的热异例(温度增加) 和石版印刷球的扩展(解压缩) 。如此的一个复杂地质的过程最后生产了“混合”的石版印刷高度化学的异质的球的披风在中生代和新生代期间。它也在在不同区域和时间之间的披风 peridotitic 捕虏体的作文导致了重要差别。

英文摘要:

This paper presents an overview of recent studies dealing with different ages of mantle peridotitic xenoliths and xenocrysts from the North China Craton, with aim to provide new ideas for further study on the destruction of the North China Craton. Re-Os isotopic studies suggest that the lithospheric mantle of the North China Craton is of Archean age prior to its thinning. The key reason why such a low density and highly refractory Archean lithospheric mantle would be thinned is changes in composition, thermal regime, and physical properties of the lithospheric mantle due to interaction of peridotites with melts of different origins. Inward subduction of circum craton plates and collision with the North China Craton provided not only the driving force for the destruction of the craton, but also continuous melts derived from partial melting of subducted continental or oceanic crustal materials that resulted in the compositional change of the lithospheric mantle. Regional thermal anomaly at ca. 120 Ma led to the melting of highly modified lithospheric mantle. At the same time or subsequently lithospheric extension and asthenospheric upwelling further reinforced the melting and thinning of the lithospheric mantle. Therefore, the destruction and thinning of the North China Craton is a combined result of per- idotite-melt interaction (addition of volatile), enhanced regional thermal anomaly (temperature increase) and lithospheric extension (decompression). Such a complex geological process finally produced a "mixed" lithospheric mantle of highly chemical heterogeneity during the Mesozoic and Cenozoic. It also resulted in significant difference in the composition of mantle peridotitic xenoliths between different regions and times.

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