نتایج جستجو برای: prehnite

تعداد نتایج: 59  

2005
CRAIG E. MANNING DENNIS K. BIRD

Zoned, silica-deficient, calcic garnets containing up to 5 mol% F substitution for 0 formed during contact metamorphism of basalts by the Skaergaard intrusion in East Greenland. Fluorian calcic garnets occur as a retrograde alteration of prograde wollastonite and clinopyroxene that fills vesicles and vugs in lavas 30-70 m from the intrusion. Paragenetically equivalent phases include fluorite, w...

Journal: :Journal Of Geophysical Research: Solid Earth 2021

Processes for formation, cooling, and altering Earth's ocean crust are not yet completely understood due to challenges in access sampling. Here, we use contiguous micro-imaging infrared spectroscopy develop complete-core maps of mineral occurrence investigate spatial patterns the hydrothermal alteration 1.2 km oceanic recovered from Oman Drilling Project Holes GT1A, GT2A, GT3A drilled Samail Op...

Journal: :International Journal of Greenhouse Gas Control 2021

Mineralization of freshwater-dissolved gases, such as CO2 and H2S, in subsurface mafic rocks is a successful permanent gas storage strategy. To apply this approach globally, the composition locally available water must be considered. In study, reaction path models were run to estimate rate extent mineralization reactions during gas-charged freshwater seawater injection into basalts at temperatu...

Journal: :Minerals 2021

In recent years, a new type of material called Philippines “Dushan jade” has appeared in the gemstone market China. This material, very similar appearance and physical properties to Dushan jade, an important ancient jade with long history China, is causing confusion poses identification difficulties. Microscopy, electron probe microanalysis, Fourier transform infrared (FTIR) spectroscopy, Raman...

آرایی, شوجی, ترابی, قدرت, امامی, محمد هاشم , حسن احمد, احمد , سبزه‌یی, مسیب , محجل, محمد ,

In north of Anarak area, in the upper Proterozoic ophiolite, exist Massive and Vein type Rodingites. Vein type rodingites have formed in two phases. Massive or Static rodingites have formed during oceanic crust spreading and ophiolite formation, and Vein type or Dynamic rodingites have formed during Anarak ophiolite emplacement and tectonic activities. Abundance order of minerals in massive rod...

آرایی, شوجی, نصوحیان, نرگس, ترابی, قدرت ,

The Bayazeh ophiolite, with Paleozoic age, is located in the eastern margin of the Yazd Block (Central Iran). This ophiolite consists of serpentinized peridotites, metagabbro, ultrabasic metamorphosed dikes, metapicrite, serpentinite and metalistvenite. Rock forming minerals of the metapicrites in the Bayazeh ophiolite are olivine (completely altered to serpentine), clinopyroxene (diopside, aug...

جوانمردی, مژگان, داودیان دهکردی, علیرضا ,

Eocene volcanic rocks in south of Asad Abad (north-east of Koohpayeh, Isfahan Province) experienced very low-grade metamorphism (hydrothermal metamorphism), resulting in prehnite, malachite, azurite, zeolite, quartz and calcite crystallization in cavities and fractures. Chlorite (brunsvigite) and amphibole (ferro-actinolite) appear on secondary phases. Augite and labradorite are two main minera...

تقی پور, بتول, طهماسبی, زهرا , مکی‌زاده, محمدعلی, میکائیلی, رحیمه , نقره ئیان, موسی ,

Astaneh granitoid intrusion is located in southwest of Arak city that is part of Sanandaj-Sirjan zone.  This intrusive mass alterated under influence of hydrothermal fluids and so propylitic alteration is one of the most important types of alterations in this granitoid. Epidote, sphene, prehnite and quartz are important minerals in this alterated rocks. The weight percent of pistacist in epidot...

1998
Carol J. Bruton

The ability of the EQ3 and EQ6 geochemical modeling codes and the GEMBOCHS thermodynamic data bases (Wolery, 1992; Wolery and Daveler, 1992) to simulate geochemical changes in the post-emplacement environment at the potential Yucca Mountain, Nevada repository is being tested using observed mineral-fluid relations in the Taupo Volcanic Zone of New Zealand. In this report, comparisons between obs...

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