Person

Drew T Downs

2 items:

Electron microprobe data for plagioclase, olivine, pyroxene, and spinel in volcanic rocks from the Matan volcanic center located within the Harrat Rahat volcanic field, Kingdom of Saudi Arabia Mineral compositions are reported for Quaternary volcanic rocks of the Matan volcanic center, northern Harrat Rahat, Saudi Arabia. Compositions were measured by wavelength-dispersive methods with the 5-spectrometer JEOL-8900 electron microprobe at the USGS facility in Menlo Park, California; background-corrected X-ray intensities were reduced to oxide weight concentrations with the JEOL proprietary version of the CITZAF reduction schema. These results are part of a collaborative study by the U.S. Geological Survey and Saudi Geological survey to assess the volcanic and seismic hazards associated with the northern Harrat Rahat volcanic field. Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Al Madinah Al Munawwarah, Kingdom of Saudi Arabia, Geochemistry, Geochemistry, Harrat Rahat volcanic field, USGS Science Data Catalog (SDC), All tags... Volcanology, Fewer tags
Major- and Trace-Element Chemical Analyses of Rocks from the Northern Harrat Rahat Volcanic Field and Surrounding Area, Kingdom of Saudi Arabia This dataset includes X-ray fluorescence (XRF) major-oxide and trace-elements analysis and inductively coupled plasma-mass spectrometry (ICP-MS) trace-element analysis of Cenozoic, mainly Quaternary, basalts, hawaiites, mugearites, benmoreites, and trachytes from the northern third of the Harrat Rahat volcanic field and surrounding area in the Kingdom of Saudi Arabia. These samples were collected and analyzed to support geologic mapping of the volcanic field and reconstruction of its volcanic history as part of a collaborative project between the Saudi Geological Survey (SGS) and the U.S. Geological Survey (USGS), supported by the Kingdom of Saudi Arabia. Chemical analyses were performed at the GeoAnalytical Laboratory... Categories: Data; Tags: Al-Madinah, Basalt, Benmoreite, Geochemistry, Geochemistry, All tags...

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