Pyroxenite-derived Cenozoic basaltic magmatism in central Inner Mongolia, eastern China: Potential contributions from the subduction of the Paleo-Pacific and Paleo-Asian oceanic slabs in the Mantle Transition Zone
Pyroxenite-derived Cenozoic basaltic magmatism in central Inner Mongolia, eastern China: Potential contributions from the subduction of the Paleo-Pacific and Paleo-Asian oceanic slabs in the Mantle Transition Zone
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中国东部内蒙古中部辉石岩衍生的新生代玄武岩岩浆作用：地幔过渡带古太平洋和古亚洲洋板俯冲的潜在贡献
DOI：
10.1016/j.lithos.2019.02.012
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发表时间：
2019-05
期刊：
影响因子：
3.5
通讯作者：
Tian Liyan
中科院分区：
文献类型：
--
作者：
Pang Chong-Jin;Wang Xuan-Ce;Li Chao-Feng;Wilde Simon A.;Tian Liyan
广泛分布的新生代玄武岩，大约在公元前1000年喷发。24-0.16 Ma的岩浆活动，对认识大洋板片俯冲与大陆板内岩浆作用的成因之间的潜在联系具有重要意义。本文研究了内蒙古中部阿巴嘎、辉腾梁和赤峰地区新生代碱性玄武岩和拉斑玄武岩的全岩地球化学和同位素数据，以及橄榄石成分。结果表明，橄榄石+单斜辉石（碱性玄武岩）和橄榄石（拉斑玄武岩）的分离结晶，在其岩浆演化中发挥了关键作用，没有显着的地壳混染或岩浆后蚀变。地球化学和岩石成因分析表明，辉石和石榴石是碱性玄武岩和拉斑玄武岩的残余矿物组合的优势相，这意味着这些玄武岩的辉石岩源。我们建议，辉石岩为主的来源可能是回收的大洋板片衍生的熔体和周围的地幔橄榄岩之间的反应的产物。内蒙古中部新生代玄武岩的空间和地球化学变化，以及中国东部地区近年来的地球物理和地质观测结果表明，新生代大陆板内岩浆活动的起源和演化可能与古太平洋和古亚洲洋片的俯冲作用有关。这两个俯冲板块的再循环海洋物质的加入，从而影响了中国东部的地幔源区岩性和深部地球动力学过程。
Widespread Cenozoic basalts, erupted at ca. 24–0.16 Ma in central Inner Mongolia, eastern China, are significant for understanding the potential links between deep subduction of oceanic slabs and the genesis of continental intra-plate magmatism. Here we examine the whole-rock geochemical and isotopic data, as well as olivine compositions, for Cenozoic alkali and tholeiitic basalts from the Abaga, Huitengliang, and Chifeng areas in central Inner Mongolia. The results suggest that fractional crystallization of olivine + clinopyroxene (in the alkali basalts) and olivine (in the tholeiites), played a key role in their magmatic evolution, without significant crustal contamination or post-magmatic alteration. Geochemical and petrogenetic analyses show that pyroxene and garnet were dominant phases in the residual mineral assemblage for both alkali basalts and tholeiites, implying a pyroxenite source for these basalts. We propose that a pyroxenite-dominated source may be the product of reaction between recycled oceanic slab-derived melts and surrounding mantle peridotites. The spatial and geochemical variations of the Cenozoic basalts in central Inner Mongolia, together with recent geophysical and geological observations in eastern China, imply that the origin and evolution of large-scale Cenozoic continental intra-plate magmatism can be related to subduction of the Paleo-Pacific and Paleo-Asian oceanic slabs. Incorporation of recycled oceanic materials from these two subducted slabs thus influenced the mantle source lithologies and deep-Earth geodynamic processes beneath eastern China.
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影响因子：
5
作者：
Dongya Zou;Yongsheng Liu;Zhaochu Hu;Shan Gao;K. Zong;Rongke Xu;Lixu Deng;Detao He;Changgui Gao
通讯作者：
Dongya Zou;Yongsheng Liu;Zhaochu Hu;Shan Gao;K. Zong;Rongke Xu;Lixu Deng;Detao He;Changgui Gao
影响因子：
5.3
作者：
A. Gurenko;A. Sobolev;K. Hoernle;F. Hauff;H. Schmincke
通讯作者：
A. Gurenko;A. Sobolev;K. Hoernle;F. Hauff;H. Schmincke
识别年轻地幔柱源区的古老地幔储层和年轻的再生材料：对地幔柱和板块构造之间潜在联系的启示
影响因子：
5.3
作者：
Li, Xian-Hua;Li, Jie;Xu, Yi-Gang;Li, Xiang-Hui
通讯作者：
Li, Xiang-Hui
影响因子：
4.6
作者：
Yang ZF;Zhou JH
通讯作者：
Zhou JH
峨眉山火成岩省玄武岩浆同化水镁石大理岩导致富镁橄榄石与磁铁矿的伴生
影响因子：
3.9
作者：
Tang Qingyan;Li Chusi;Tao Yan;Ripley Edward M.;Xiong Feng
通讯作者：
Xiong Feng