The stable-isotope geochemistry of sulfate minerals that form principally in I-type igneous rocks and in the various related hydrothermal systems that develop from their magmas and evolved fluids is reviewed with respect to the degree of approach to isotope equilibrium between minerals and their parental aqueous species. Examples illustrate classical stable-isotope systematics and principles of...

Calcite cement is a common diagenetic mineral in carbonate rocks and plays an important role on rock quality as hydrocarbon reservoirs. Traditionally, oxygen isotopic compositions (δ 18 O) of the calcites tend to decrease with increasing depths due temperature-dependent isotope fractionation. In this study, stable calcite cements Changxing Feixianguan formations from Puguang, Yuanba, Jiannan Fu...

Abstract Gypsum crystals are found at the well perforation of observation Ktzi 202 test site for CO 2 storage Ketzin, Germany. XRD analysis confirms pure gypsum. Fluid samples before and after injection analyzed. Geochemical modeling is conducted to identify mechanisms that lead gypsum formation. The carried out with PHREEQC Pitzer database due high salinity up 5 mol per kg water. Due their sig...

Abstract The small stalactites found on the ceiling at level I near Sutoris shaft in thirteenth-century historic salt mine Bochnia, Poland, are mainly composed of mirabilite (Na 2 SO 4 ·10H O) followed by blödite Mg(SO ) ·4H O). unique presence these two minerals only one location this old underground is attributed to contemporary precipitation from percolating solutions. This can be caused a c...

Extensive development in the St. George, Utah area resulted in the temporary exposure of fresh rock at and near the St. George Dinosaur Discovery Site at Johnson Farm (SGDS), facilitating examination and description of the Lower Jurassic stratigraphy of the vicinity in some detail. Since this study, construction has covered much of what we observed, making this the only detailed record of the M...