نتایج جستجو برای: silicate rock
تعداد نتایج: 49032 فیلتر نتایج به سال:
The secondary mineral budget on Earth is dominated by clay minerals, Al-hydroxides, and Fe-oxides, which are formed under the moderate pH, high water-to-rock ratio conditions typical of Earth's near-surface environment. In contrast, geochemical analyses of rocks and soils from landed missions to Mars indicate that secondary mineralogy is dominated by Mg (±Fe, Ca)-sulfates and Feoxides. This dis...
[1] Reduced weathering rates due to the lack of liquid water and significantly greater typical surface ages should result in a higher density of meteorites on the surface of Mars compared to Earth. Several meteorites were identified among the rocks investigated during Opportunity’s traverse across the sandy Meridiani plains. Heat Shield Rock is a IAB iron meteorite and has been officially recog...
[1] We used a suite of techniques, including those emulating compositional data sets obtained from Mars orbit and obtainable at the Mars surface, to examine aqueous alteration of basaltic rocks from Iceland as a mineralogic and geochemical analog for Noachian environments on Mars. A sample suite was collected for laboratory measurement of (1) whole-rock visible/near-infrared (VNIR) reflectance ...
S U M M A R Y Many unresolved questions in geodynamics revolve around the physical behaviour of the two-phase system of a silicate melt percolating through and interacting with a tectonically deforming host rock. Well-accepted equations exist to describe the physics of such systems and several previous studies have successfully implemented various forms of these equations in numerical models. T...
The wealth of new data, mostly from the ocean bottom, that precipitated the acceptance of plate tectonics during the 1960’s simultaneously also opened the door for the first time in more than 200 years to a technically credible defense of the Genesis Flood. From the mid-1700’s through the days of Hutton, Lyell, and Darwin to the 1960’s, it overwhelmed the human mind to imagine a mechanism that ...
Introduction: The Opportunity rover landed in Eagle Crater in Meridiani Planum on January 24, 2004. Among the first images acquired included a light-toned rock that was the first outcrop observed from the surface of Mars. As seen in Pancam and Microscopic Imager images [1,2], the outcrop rock is layered, and portions exhibit fine-scale morphology similar to terrestrial ripple marks [3]. The out...
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