نتایج جستجو برای: prehnite
تعداد نتایج: 59 فیلتر نتایج به سال:
The Anarak ophiolite, with E-W trending, located at north of Anarak. In addition to the gabbros in Anarak ophiolite sequence, intrusion of metasomatized gabbros injected into the ophiolite of Anarak in the form of stocks and dykes. metasomatized gabbros are younger than Anarak ophiolite and older than Anarak metamorphic assemblage and contain diopside, augite, actinolitic hornblende, actinolite...
Sarkobeh area is located north of Khomein in the most unstable tectonic zone (Sanandaj - Sirjan). In the area, exposed rocks are limestone, quartzitic rocks and gabbro (alkaline gabbro). The main minerals in rocks are, plagioclase, clinopyroxene and opaque, while the accessory minerals include biotite, amphibole, quartz, apatite, zircon as and chlorite and prehnite - pumpellyite are represent...
Pillow lavas are one of the important rock units of Nain ophiolite. Rock forming minerals of Nain ophiolite pillow lavas are chloritized olivine, plagioclase, clinopyroxene (augite), Cr-spinel, magnetite, amphibole, chlorite, pumpellyite, epidote, prehnite and calcite. Whole rock geochemical analyses and composition of clinopyroxenes and chromian spinels of these rocks indicate that they are si...
This paper is the first attempt to study mineralogical and geochemical features of mineralization hosted within volcanic rocks Baska Piwaza section, at Halgurd Mountain, which highest mountain in Kurdistan whole Iraq. The host lithologies studied section represent mostly (basalts andesites), secondary sedimentary lithologies, such as radiolarian chert. There are two main stages oxide sulfide th...
Alkaline hydrothermal systems hosted in granitic rocks have been extensively investigated as natural analogues for radioactive waste disposal and the geological storage of CO2. Thereby, their geochemical characterisation provides useful information long-term performance assessment predictions. The modelling one these alkaline has performed Luchon (France), together with application different ge...
The Avalon Peninsula on the island of Newfoundland, Canada, defined as type zone Avalonia, is believed to have been impacted by several orogenetic and deformation events since Neoproterozoic. Previous studies determined that lowest degree metamorphism reached in successions was prehnite–pumpellyite or greenschist facies. We sampled measured 13 mainly clastic sedimentary sections ranging from la...
[1] The Noachian terrain west of the Isidis basin hosts a diverse collection of alteration minerals in rocks comprising varied geomorphic units within a 100,000 km region in and near the Nili Fossae. Prior investigations in this region by the Observatoire pour l’Minéralogie, l’Eau, les Glaces, et l’Activité (OMEGA) instrument on Mars Express revealed large exposures of both mafic minerals and i...
Merelaniite is a new mineral from the tanzanite gem mines near Merelani, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania. It occurs sporadically as metallic dark gray cylindrical whiskers that are typically tens of micrometers in diameter and up to a millimeter long, although a few whiskers up to 12 mm long have been observed. The most commonly associated minerals include zoisi...
Geophysical observations indicate that patches of localized fracturing occur within otherwise viscous regions subduction plate boundaries. These place uncertainty on the possible down-dip extent seismogenic zone, and as a result maximum magnitude thrust earthquakes. However, processes controlling where how occurs shear zones are unclear. We examined three exposures exhumed boundary Kyushu, Japa...
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