Importance of melt circulation and crust-mantle interaction in the lithospheric evolution beneath the North China Craton: Evidence from Mesozoic basalt-borne clinopyroxene xenocrysts and pyroxenite xenoliths
Importance of melt circulation and crust-mantle interaction in the lithospheric evolution beneath the North China Craton: Evidence from Mesozoic basalt-borne clinopyroxene xenocrysts and pyroxenite xenoliths
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熔体循环和壳幔相互作用在华北克拉通岩石圈演化中的重要性：中生代玄武岩中单斜辉石捕虏晶和辉石岩捕虏体的证据
DOI：
10.1016/j.lithos.2006.10.002
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发表时间：
2007-06
期刊：
影响因子：
3.5
通讯作者：
Y. Morishita
中科院分区：
文献类型：
--
作者：
N. T. Kita;J. F. Ying;J. A. Shao;Y. H. Tang;H. F. Zhang;G. Shimoda;Y. Morishita
中国克拉通北部中生代防城玄武岩中含有大量的单斜辉石包体和辉石包体，为研究该区次大陆岩石圈演化过程中的熔体循环和壳幔相互作用提供了重要信息。包裹体均表现出结构和化学分带特征。分区大多很简单(简单分区)，但也有一些显示出复杂的模式(复杂分区)。原位主量元素和微量元素分析表明，所有简单分带的捕虏晶可能都是从地幔深处的辉石岩脉中解体出来的。这种分带作用被认为是岩浆夹带后与寄主岩浆发生化学交换的结果。复杂分带的捕虏晶记录了复杂的岩石圈演化历史：其岩芯保存了下地壳高温麻粒岩相变质作用的信息，其中间带可能记录了地幔尖晶石相稳定场中的变质增生。因此，复杂分带包裹体的核可能来源于太古宙下地壳或新增生的下地壳，中间带可能是壳幔相互作用形成的。辉石岩包体均为堆积体，由地幔深部或壳幔过渡带的轻稀土富集熔体结晶而成。因此，单斜辉石包体和辉石岩包体为岩石圈地幔中存在相当大的壳幔相互作用和熔体循环提供了证据，从而导致了岩石圈的快速富集化。
Mesozoic Fangcheng basalts from the North China Craton contain many clinopyroxene xenocrysts and pyroxenite xenoliths, which provide important information about melt circulation and crust-mantle interaction in the evolution of the sub-continental lithosphere beneath the region. All the xenocrysts show textural and chemical zoning. The zoning is mostly simple (simply-zoned), but some show complex patterns (complexly-zoned). In-situ major and trace element analyses suggest that all the simply-zoned xenocrysts may have been disaggregated from pyroxenite veins at mantle depth. The zoning is interpreted to result from chemical exchange with the host magma after their entrainment. The complexly-zoned xenocrysts record a complicated history of the lithospheric evolution: their cores could preserve information of high-temperature granulite-facies metamorphism in the lower crust and their intermediary zones might record metamorphic overgrowth in the mantle spinel-facies stability field. Therefore, the cores of the complexly-zoned xenocrysts have probably been derived from the Archean lower crust or newly-accreted lower crust and the intermediary zones could be formed through crust–mantle interaction. All the pyroxenite xenoliths are cumulates and were crystallized from the LREE enriched melts at mantle depth or crust–mantle transitional zone. Thus the clinopyroxene xenocrysts and pyroxenite xenoliths provide evidence for the existence of considerable crust–mantle interaction and melt circulation in the lithospheric mantle, which led to rapid lithospheric enrichment.
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影响因子：
3.5
作者：
Jifeng Ying;Xin-hua Zhou;Hong‐fu Zhang
通讯作者：
Jifeng Ying;Xin-hua Zhou;Hong‐fu Zhang
影响因子：
5
作者：
Foley, SF;Jackson, SE;Jenner, GA
通讯作者：
Jenner, GA
影响因子：
5
作者：
Yongsheng Liu;Shan Gao;Shuyan Jin;Shenghong Hu;M. Sun;Zu-Bin Zhao;Jiaqing Feng
通讯作者：
Yongsheng Liu;Shan Gao;Shuyan Jin;Shenghong Hu;M. Sun;Zu-Bin Zhao;Jiaqing Feng
影响因子：
2.6
作者：
Hong‐fu Zhang;M. Sun
通讯作者：
Hong‐fu Zhang;M. Sun
DOI：
--
发表时间：
1987-05
期刊：
--
影响因子：
--
作者：
M. Menzies;N. Rogers;A. Tindle;C. Hawkesworth
通讯作者：
M. Menzies;N. Rogers;A. Tindle;C. Hawkesworth