کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6482038 1638638 2016 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Al-in-olivine thermometry evidence for the mantle plume origin of the Emeishan large igneous province
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Al-in-olivine thermometry evidence for the mantle plume origin of the Emeishan large igneous province
چکیده انگلیسی


- We estimate the Al-in-olivine temperatures for the picrites in the ELIP.
- The maximum crystallization temperature of the ELIP (1440 °C) is ~ 250 °C higher than the average temperature of MORB.
- The results provide compelling evidence for the existence of thermal mantle plumes in the ELIP.

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Lithos - Volumes 266–267, December 2016, Pages 362-366
نویسندگان
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