Dissolution Rates of Allophane, FE-Containing Allophane, and Hisingerite and Implications for Gale Crater, Mars

Ralston, S J ; Hausrath, E M ; Tschauner, O ; Rampe, E B ; Christoffersen, R

关键词: DISSOLVING;    CHEMICAL ANALYSIS;    DIFFRACTOMETERS;    ALUMINUM SILICATES;    IRON SILICATES;    AMORPHOUS MATERIALS;    MARS SURFACE SAMPLES;    MARS CRATERS;    RHYOLITE;    BASALT;    GLASS;    CRYSTALLINITY;    SOIL SAMPLING;    CURIOSITY ROVER;    NASA SPACE PROGRAMS;   

RP-ID  :  JSC-E-DAA-TN52410

学科分类：天文学(综合)

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Investigations with the CheMin Xray Diffractometer (XRD) onboard the Curiosity rover in Gale Crater demonstrate that all rock and soil samples measured to date contain approximately 15-70 weight percentage X-ray amorphous materials. The diffuse scattering hump from the X-ray amorphous materials in CheMin XRD patterns can be fit with a combination of allophane, ferrihydrite, and rhyolitic and basaltic glass. Because of the iron-rich nature of Mars' surface, Fe-rich poorly-crystalline phases, such as hisingerite, may be present in addition to allophane.