کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8910733 | 1637925 | 2018 | 60 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diffusion of helium, hydrogen and deuterium in diamond: Experiment, theory and geochemical applications
ترجمه فارسی عنوان
انتشار هلیوم، هیدروژن و دتریم در الماس: آزمایش، تئوری و کاربردهای ژئوشیمیایی
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کلمات کلیدی
الماس، هلیم، هیدروژن، دوتریوم، نفوذ، تجزیه و تحلیل واکنش هسته ای، تجزیه ایزوتوپ، تئوری کاربردی تراکم،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
The experimental data indicate that diamonds equilibrate with ambient H and He in the mantle on timescales brief relative to most geological processes and events. However, He diffusion in diamond is slower than in any other mineral measured to date, including other kimberlite-hosted minerals. Under some circumstances, diamond may provide information about mantle He not recoverable from other minerals. One possibility is diamonds entrained in kimberlites. Since the ascent of kimberlite from the mantle to near-surface is very rapid, entrained diamonds may retain most or all of the H and He acquired in mantle environments. Calculations using reasonable ascent rates and T-t paths indicate that He diffusive loss from kimberlite-hosted diamonds is negligible for grains of 1.0-0.2â¯mm radius, with fractional losses <0.15% for all ascent rates considered. If the host kimberlite magma is effectively quenched in the near-surface (or is erupted), diamonds should contain a faithful record of [He] and He isotopes from the mantle source region. Preservation of H in kimberlite-hosted diamonds is less clear-cut, with model outcomes depending critically upon rates of ascent and cooling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 232, 1 July 2018, Pages 206-224
Journal: Geochimica et Cosmochimica Acta - Volume 232, 1 July 2018, Pages 206-224
نویسندگان
D.J. Cherniak, E.B. Watson, V. Meunier, N. Kharche,