کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8910375 1637495 2018 65 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mercury stable isotope compositions in magmatic-affected coal deposits: New insights to mercury sources, migration and enrichment
ترجمه فارسی عنوان
ترکیبات ایزوتوپ پایدار جیوه در ذخایر ذغال سنگ تحت تاثیر ماگمایی: بینش جدید به منابع جیوه، مهاجرت و غنی سازی
کلمات کلیدی
جیوه، ایزوتوپهای جیوه، زغال سنگ، مایعات هیدروترمال، نفوذ مغناطیسی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
چکیده انگلیسی
The Wulantuga No. 6 coal seam is extremely enriched in Hg, varying from 0.37 μg/g in middle coal benches to 40-90 μg/g in the upper most and lowest coal benches. Approximately 2.5‰ variation in mass dependent fractionation (MDF, − 3.07‰ to − 0.58‰ in δ202Hg) is observed. δ202Hg vs. 1/[Hg] diagram suggests a mixture of three Hg end-members: original hydrothermal fluids, fractionated hydrothermal fluids and native coal-forming materials. In addition, Wulantuga coals all show positive mass independent fractionation (MIF) of odd isotopes, up to 0.87‰ in Δ199Hg and 0.66‰ in Δ201Hg. The Δ199Hg/Δ201Hg ratios range from 1.3 to 3.3, suggesting that a large fraction of photodegraded methylmercury was likely incorporated into the coal deposit. The magmatic-intruded Wolonghu No. 8 coal seam is only slightly to intermediately enriched in Hg, varying from 0.10 μg/g to 0.40 μg/g. The coals near the contact sill (≤ 5 cm, − 1.81‰ to − 1.52‰) have similar δ202Hg as the magmatic sill rocks (− 2.05‰ to − 1.80‰), both with insignificant MIF values. Coals far from the contact sill (≥ 15 cm) have δ202Hg values varying from − 3.40‰ to − 1.61‰ and Δ199Hg varying from 0.26‰ to 0.58‰, which are significantly enriched in light and odd Hg isotopes compared to coals near the contact sill. Δ199Hg and Δ201Hg in Wolonghu coals far from the contact sill resemble those of meteoritic waters and seawater in both magnitude and Δ199Hg/Δ201Hg ratio. Our two case studies show significant MDF and MIF of Hg isotopes, which inform on Hg migration and sequestration in the magmatic rocks and coal deposits, and on the roles of meteoric water and hydrothermal fluid circulation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 479, 20 February 2018, Pages 86-101
نویسندگان
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