Abst rac t -Oxygen isotopic compositions were determined for coexisting mixed-layer serpentine-chlorite (Sp-Ch) and illite-smectite (I-S) from 5 Tuscaloosa Formation sandstone cores sampled between 1937 and 5470 m burial depth. High gradient magnetic separation (HGMS) was used to concentrate Sp-Ch and I-S from the <0.5 p~m fraction of each core sample into fractions with a range in the Sp-Ch : ...

Abstract Chlorite is recognized worldwide as a key mineral that inhibits the development of quartz cement in deeply buried sandstone reservoirs. Iron-rich chlorite mainly formed by transformation precursor clay mineral; however, few studies have focused on early stages before crystallization chlorite. This study analyzed shallowly (400–1000 m) coastal sandstones from within Wealden Group Paris ...

Applying machine learning techniques to large datasets of in situ analyses has been proven be a powerful tool Earth Sciences. However, problems may arise when dealing with minerals such as chlorite, that exist solid solution rather than single, stoichiometric ideal. It can difficult determine whether the variations major element concentrations are due compositional difference mineral interest o...

In this study, clay and non-clay minerals in the cement of Cretaceous volcanogenic–sedimentary rocks from bottom marginal seas north-western Pacific Ocean adjacent areas were studied. Corrensite mixed-layer chlorite–smectite, rectorite illite–smectite, chlorite, swelling chlorite (?), illite, kaolinite, smectite calcite, ankerite, barite, gypsum, epsomite, zeolites (laumontite, analcime, stilbi...

jian cu deposit is hosted by surian volcano-sedimentary complex of permo-triassic age on the eastern edge of the sanandaj-sirjan metamorphic zone at a distance of 195 km from shiraz, southwestern iran. the complex consists mainly of metabasalt, chlorite-quartz schist, chlorite-muscovite schist, mica schist and graphite schist. pyrite is the most important sulfide and chalcopyrite is the major c...

The specific surface area as determined by BET analysis is often used for scaling mineral surface reaction capacities and rates between particles of different sizes as found in nature. Generally, an inverse proportionality between BET area and particle size is assumed, based on geometry. However, macroscopic laboratory studies of mineral surface reactions generally employ crushed material that ...

Mineral compositions and reaction textures found in migmatitic gneisses from near Gilsum, New Hampshire, constrain both peak metamorphic pressure (P) and temperature (T) conditions and the PT path. Large K-feldspar porphyroblasts indicate isobaric heating of the samples at P < 4 kb (Spear et al. 1999), and relict cordierite + garnet assemblages record the occurrence of biotite vapor-absent melt...