کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5488032 1523899 2017 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preferential formation of sodium salts from frozen sodium-ammonium-chloride-carbonate brines - Implications for Ceres' bright spots
ترجمه فارسی عنوان
تشکیل ترجیحی نمک های سدیم از نمک های سدیم آمونیم کلرید کربنات منجمد - پیامدهای ناشی از نقاط روشن سرس
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی
Observations of bright deposits in Ceres' Occator crater have revealed large quantities of natrite (Na2CO3) and smaller amounts of NH4Cl or NH4HCO3. These materials have been suggested to originate from the crystallization of brines that reached the surface from below. Here we report a systematic study of the chemistry of frozen brines containing sodium, ammonium, chloride, and carbonate ions via micro-Raman spectroscopy. Natrite and hydrohalite (NaCl·2H2O) are found to form preferentially, even in ammonium-dominated solutions. Additionally, NH4Cl could only form when NH4+ or Cl- (or both) are present in excess in the brine solutions. The detection of NH4Cl on Ceres' surface may thus imply an early subsurface reservoir rich in ammonium and/or chloride, placing an important constraint on modeling of the liquid composition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Planetary and Space Science - Volume 141, July 2017, Pages 73-77
نویسندگان
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