HYDROTHERMAL ALTERATION OF MIOCENE TUFFS IN NAOH•KOH SOLUTIONS, WITH SPECIAL REFERENCE TO CHEMICAL BEHAVIOR (HYDROTHERMAL STUDIES ON THE WALL-ROCK ALTERATION-3-)

Hydrothermal Alteration Associated with the Silver Queen

Evaluating the effect of using different reference spectra on SAM classification results: an implication for hydrothermal alteration mapping

This research was performed with the objective of evaluating the accuracy of spectral angle mapper (SAM) classification using different reference spectra. The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) digital images were applied in the SAM classification in order to map the distribution of hydrothermally altered rocks in the Kerman Cenozoic magmatic arc (KCMA), Iran...

Eocene Hydrothermal Systems and Contrasting Hydrothermal Alteration in the Battle Mountain District, Nevada

بررسی تجربی دگرسانی قلیایی توف‌‌های ریولیتی و تشکیل هیدروکسی‌ سودالیت در شرایط گرمابی

In order to investigate the alteration products of rhyolitic tuffs under alkaline hydrothermal condition, samples of acidic pyroclastic rocks from Darabad area (N-E Tehran) were selected. Rock samples were examined under petrographic microscope, X-Ray powder diffraction, X-Ray Fluorescence and were eventually powdered and mixed with Na+ and K+ bearing solutions in hydrothermal autoclaves. The e...

Hydrothermal Alteration of the Martian Crust: an Experimental Approach

Introduction: On Mars, the geomorphology of numerous surface features has been attributed to the interaction of magmatic and impact heat sources with an H 2 O-rich Martian crust/megaregolith [1-3]. In addition , geochemical analyses of soil at the Pathfinder and Viking landing sites indicate high concentrations of SO 3 and Cl [4-6], consistent with interaction between a basaltic protolith and f...