نتایج جستجو برای: geochemistry data
تعداد نتایج: 2415428 فیلتر نتایج به سال:
“This continuity disappears, however, if one considers individual parts of the [Central American] chain and examines separate groups of volcanoes within a restricted volcanic field. It then becomes apparent that the continuity of the province as a whole is the result of grouping excessively large segments of the chain.” A.R. McBirney: Compositional variations in Cenozoic calcalkaline suites of ...
Sarchah Cu-Au mineralization area is located in South Khorasan Province, about 180 km southwest of Birjand city, and in Lut Block Tertiary magmatism assemblages. Geology of the area consists of Eocene to Holocene volcanic lavas with basalt – andesite composition and crystal tuff. Landsat and ASTER data detected alunite, jarosite, sericite, epidote, and kaolinite alteration minerals using"standa...
All materials subject to this copyright and included in this volume may be photocopied for the noncommercial purpose of scientific or educational advancement. The geology and geochemistry of Cenozoic topaz rhyolites from the western United States.
A substantial body of evidence suggests that subsurface water masses in mid-Proterozoic marine basins were commonly anoxic, either euxinic (sulfidic) or ferruginous (free ferrous iron). To further document redox variations during this interval, a multiproxy geochemical and paleobiological investigation was conducted on the approximately 1000-m-thick Mesoproterozoic (Lower Riphean) Arlan Member ...
Experimental hydrothermal geochemistry has made great strides on the basis of stoichiometric equilibrium studies, measured kinetic rates, and bulk-sensitive spectroscopic data, but there are current problems in hydrothermal geochemistry ranging from deep aquifer chemistry to nuclear waste tank chemistry that can benefit from new techniques able to provide direct spectroscopic and microscopic in...
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