alteration of ophiolitic ultramafic rocks, formation of listwaenite and associated mineralization are interesting phenomena of metallogeny of khoy ophiolite. it seems that the hydrothermal circulations responsible for mercury mineralization were derived from geothermal systems caused by intermediate to acidic magmatism in neogene-pleistocene time. reactivation of brecciated serpentinite with hy...

Aptian carbonate rocks of Santos Basin in the Brazilian southeastern continental margin show a highly heterogeneous reservoir quality conditioned by many controlling factors. This study presents quantitative approach based on an integrated petrographic, mineralogical, and geochemical dataset Barra Velha Formation (BVF) to understand spatial temporal distribution depositional diagenetic aspects ...

Glen Torridon is a topographic trough located on the slope of Aeolis Mons, Gale crater, Mars. It corresponds to what was previously referred as “clay-bearing unit”, due relatively strong spectral signatures clay minerals (mainly ferric smectites) detected from orbit. Starting in January 2019, Curiosity rover explored for more than 700 sols (Martian days). The objectives this campaign included a...

Glauconite is an authigenic clay mineral that common in marine sedimentary successions. Dating of glauconite to determine the depositional age sequences has a long history but fallen into disfavor due difficulty obtaining “pure” separates. Recent advances petrography and reaction cell mass spectrometry permit rapid situ Rb-Sr dating carefully screened grains. However, remains susceptible burial...

A Permian bentonite deposit at Melo, Uruguay is composed of a calcite-cemented sandstone containing clay pseudomorphs of glass shards (0-0.50 m) overlying a pink massive clay deposit (0.50-2.10 m). The massive bed is composed of two layers containing quartz and smectite or pure smectite respectively. The smectite is remarkably homogeneous throughout the profile: it is a complex mixed layer comp...

kamtal skarn is located 15 km northeast of kharvana, east-azarbaijan. a quartz-monzonitic stock of oligocene age intruded the upper cretaceous sedimentary sequence (claystone, limestone, marl, and siltstone) developing noticeable metamorphic (marble, hornfels) and metasomatic (skarn) alteration zones along the contact. kamtal skarn is of calcic type and consists of both endoskarn and exoskarn z...

Introduction: There is an established relationship between organic matter content and aqueous alteration processes [1,2]. However, the relationship between meteoritic organic matter and individual aqueously generated mineral matrix phases is poorly understood. Meteoritic organic matter is primarily composed of C, H and N and therefore their bulk abundances in chondrites are strongly controlled ...

Introduction: Over the past ten years of Mars exploration, a wealth of information has been gathered from various sources that allows us to more fully address questions about the nature of mineralogic alteration of the Martian surface. The role of water now has been clearly identified by the presence of numerous aqueously-derived mineral phases observed from orbit and the surface. Here we prese...

a r t i c l e i n f o a b s t r a c t Rock alteration and rind formation in analog environments like Antarctica may provide clues to rock alteration and therefore paleoclimates on Mars. Clastic sedimentary rocks derived from basaltic sources have been studied in situ by martian rovers and are likely abundant on the surface of Mars. However, how such rock types undergo alteration when exposed to...