Al-in-olivine thermometry evidence for the mantle plume origin of the Emeishan large igneous province
Al-in-olivine thermometry evidence for the mantle plume origin of the Emeishan large igneous province
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峨眉山大火成岩省地幔柱起源的铝橄榄石测温证据
DOI：
10.1016/j.lithos.2016.10.016
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发表时间：
2016-12
期刊：
影响因子：
3.5
通讯作者：
Liu Yongsheng
中科院分区：
文献类型：
--
作者：
Xu Rong;Liu Yongsheng
峨眉山大火成岩省 (ELIP) 以其世界级的镍铜 (PGE) 矿床及其与卡皮坦大灭绝的联系而闻名。人们普遍认为 ELIP 与深部地幔柱有关。然而，这种模型的证据受到地质学、地球物理学和地球化学的挑战。在许多大型火成岩省环境中，橄榄石熔体平衡测温法已被用来争论或反对羽流的存在。然而，该方法涉及很大的不确定性，例如有关熔体成分和结晶压力的假设。橄榄石中铝温度计避免了这些不确定性，在此用于估算 ELIP 中苦味石的温度。计算出的最高温度（1440°C）显着高于（~250°C）平均 MORB 估计的橄榄石中铝温度，从而为 ELIP 中热地幔柱的存在提供了令人信服的证据。
The Emeishan large igneous province (ELIP) is renowned for its world-class Ni–Cu-(PGE) deposits and its link with the Capitanian mass extinction. The ELIP is generally thought to be associated with a deep mantle plume; however, evidence for such a model has been challenged through geology, geophysics and geochemistry. In many large igneous province settings, olivine-melt equilibrium thermometry has been used to argue for or against the existence of plumes. However, this method involves large uncertainties such as assumptions regarding melt compositions and crystallisation pressures. The Al-in-olivine thermometer avoids these uncertainties and is used here to estimate the temperatures of picrites in the ELIP. The calculated maximum temperature (1440 °C) is significantly (~ 250 °C) higher than the Al-in-olivine temperature estimated for the average MORB, thus providing compelling evidence for the existence of thermal mantle plumes in the ELIP.
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