نتایج جستجو برای: keywords hydrothermal alteration
تعداد نتایج: 2031716 فیلتر نتایج به سال:
[1] Spirit’s Mössbauer (MB) instrument determined the Fe mineralogy and oxidation state of 71 rocks and 43 soils during its exploration of the Gusev plains and the Columbia Hills (West Spur, Husband Hill, Haskin Ridge, northern Inner Basin, and Home Plate) on Mars. The plains are predominantly float rocks and soil derived from olivine basalts. Outcrops at West Spur and on Husband Hill have expe...
[1] Spirit’s Mössbauer (MB) instrument determined the Fe mineralogy and oxidation state of 71 rocks and 43 soils during its exploration of the Gusev plains and the Columbia Hills (West Spur, Husband Hill, Haskin Ridge, northern Inner Basin, and Home Plate) on Mars. The plains are predominantly float rocks and soil derived from olivine basalts. Outcrops at West Spur and on Husband Hill have expe...
In geologic imaging spectroscopy studies, typical end products are often mineral maps. These maps are usually ambiguous and form a limited method of representing geological information that is potentially contained in spectroscopic images. This situation can be improved by mapping the spatial configuration of the effects of geological processes instead of the solely individual minerals in a non...
Hydroxy davyne is a hydrated aluminosilicates with the same structure as cancrinite mineral group. Scientist categorized hydroxy davyne as zeolite because of its low temperature formation conditions and hydrated structure. Existence of [Ca.Cl] + group instead of [Na.H2O] + group is the significant property of this mineral. Alteration of volcanic ash in presence of alkaline hydrothermal solution...
Home Plate is a plateau in the Columbia Hills of Gusev Crater [1]. It is a layered sequence of clastic rocks with alkali basaltic composition. Based on stratigraphy, structure, sedimentology, mineralogy, and bulk chemistry it is interpreted as pyroclastic deposit and thought to be extensively hydrothermally altered [1-5]. The hydrothermal alteration is presumed to be of high and low temperature...
The Golden Butte sediment-hosted disseminated (Carlin-type) gold deposit is located on the western flank of the Cherry Creek Range in east central Nevada. The ore body contains nearly 3 million tons of gold ore with an average grade of 0.031 ounces per ton. The main host of the gold ore is the Mississippian Chainman Shale, a carbonaceous, silty claystone to siltstone. A low-angle (normal?) faul...
Chlorite group minerals have a wide range of chemical compositions which reflect the physicochemical conditions of their crystallization. The solid solution (cationic substitution) model in crystal lattice of chlorite were satisfactorily used in estimation of its formation temperature in different geologic environments such as ore deposits, low-degree metamorphism, hydrothermal alteration and d...
Most of Earth's diamonds are connected with deep-seated mantle rocks; however, in recent years, μm-sized diamonds have been found in shallower metamorphic rocks, and the process of shallow-seated diamond formation has become a hotly debated topic. Nanodiamonds occur mainly in chondrite meteorites associated with organic matter and water. They can be synthesized in the stability field of graphit...
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