Geochemistry of Late Mesozoic lamprophyre dykes from the Taihang Mountains, north China, and implications for the sub-continental lithospheric mantle

B. Chen; M. Zhai

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Geochemistry of Late Mesozoic lamprophyre dykes from the Taihang Mountains, north China, and implications for the sub-continental lithospheric mantle

机译：中国北方太行山中生代晚期煌斑岩的地球化学特征及其对亚大陆岩石圈地幔的意义

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Many late Mesozoic lamprophyre dykes occur in the Taihang Mountains (north China). these lamprophyres are rich in large ion lithophile elements (e.g. Rb, Sr, Ba and K) and light REE, and have highly differentiated REE patterns. They show large but regular variations in chemical and Nd-Sr isotopic compositions. All these suggest that the lamprophyres were produced from differentiation of a parental magma, coupled with contamination by lower curst. The parental magma was derived from melting of a long-term enriched sub-continental lithospheric mantle source as is indicated by the highly enriched isotopic signatures of the lamprophyres. Mantle enrichment in the area was probably produced by interaction of volatile-rich melts released from the asthenosphere with the above lithosphere in middle Proterozoic times.

机译：太行山（中国北部）有许多中生代晚期的煌斑岩脉。这些煌斑岩富含大型离子亲石元素（例如Rb，Sr，Ba和K）和轻稀土元素，并具有高度差异化的稀土元素模式。它们在化学和Nd-Sr同位素组成上显示出较大但有规律的变化。所有这些表明，煌斑岩是由母岩浆的分化产生的，再加上较低的凝乳造成的污染。母岩浆来自长期富集的亚大陆岩石圈地幔源的熔融，如煌斑岩的高度富集同位素特征所表明。该地区的地幔富集可能是由于元古代中期从软流圈释放的富含挥发性的熔体与上述岩石圈相互作用而产生的。

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《Geological Magazine》 |2003年第1期|共7页
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B. Chen; M. Zhai;
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正文语种 eng
中图分类地质学;
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geochemistry; lamprophyres; lithosphere; Mesozoic; northern China;

机译：地球化学斑岩岩石圈中生代北方;

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Geochemistry of Late Mesozoic lamprophyre dykes from the Taihang Mountains, north China, and implications for the sub-continental lithospheric mantle

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