کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4680873 1634932 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transformation of jarosite to hematite in simulated Martian brines
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Transformation of jarosite to hematite in simulated Martian brines
چکیده انگلیسی

The presence of jarosite – a hydrous iron sulfate – at Meridiani Planum supports the past existence of water on Mars surface. Thermodynamic calculations suggest that jarosite should transform to ferric oxyhydroxides in aqueous media. Here we show that jarosite can transform directly to hematite – the iron oxide identified at Meridiani Planum – in simulated Martian brines. Our results are consistent with a short aqueous history, but also indicate that jarosite can persist in highly saline Martian brines. The formation of goethite, a common iron oxyhydroxide on Earth, is prevented by the low water activity and/or high phosphate concentration of Martian brines.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 251, Issues 3–4, 15 November 2006, Pages 380–385
نویسندگان
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