کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6427117 1634704 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydration state of calcium sulfates in Gale crater, Mars: Identification of bassanite veins
ترجمه فارسی عنوان
وضعیت هیدراتاسیون سولفات کلسیم در دهانه گیل، مریخ: شناسایی ورن های باسانی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی


- Experiments on calcium sulfate pellets were performed to calibrate the LIBS hydrogen signal.
- Bright veins analyzed in situ at Gale crater are made predominantly of bassanite.
- Bassanite could have resulted from the desiccation of gypsum.

In-situ analyses reveal the presence of hydrogen within calcium sulfate veins crosscutting the sediments found in Gale crater. Laboratory experiments were performed to calibrate the hydrogen signal measured by laser induced breakdown spectroscopy (LIBS) in a range applicable to martian data. The analyses indicate that all veins targeted so far at Gale consist predominantly of bassanite which most likely formed by dehydration of gypsum. This scenario suggests that the percolating water produced gypsum, possibly by hydration of anhydrite in aqueous solution, and remained at temperatures below ∼60 °C at that time. Desiccating conditions followed, consistent with a hyperarid climate and favored by burial or impacts. Additionally, anhydrite with lesser bassanite has been found by XRD in samples of sediments hosting the veins. Our result suggests bassanite is likely found in the veins and anhydrite may be more common as a fine-grained component within the sediments.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 452, 15 October 2016, Pages 197-205
نویسندگان
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