Filters: Tags: gypsum (X) > partyWithName: U.S. Geological Survey (X)

Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts Frank T Dulong Energy Resources Program C Blaine Cecil Bruce S Hemingway U.S. Geological Survey - ScienceBase Eric A Morrissey Energy and Minerals Tag Types Theme (13) Place (13) USGS Scientific Topic Keyword (1) Harvest Set (1) Tag Schemes Geographic Names Information System (12) The National Map Collection Thesaurus (12) The National Map Product Format Thesaurus (12) USGS Thesaurus (https://www2.usgs.gov/science/about/) (1) ISO 19115 Topic Category (12) The National Map Product Extent Thesaurus (12) The National Map Theme Thesaurus (12) More... View Results as: JSON ATOM CSV

The chemistry of eolian quartz dust and the origin of chert Temporal and spatial sources of silica for chert remain poorly constrained. Modern sources to the worlds oceans include silica in rivers > aeolian (dust) deposition > sea floor vents and submarine weathering. However, changes in aridity and dust flux during the Phanerozoic may explain variations in the ocean silica cycle and times and places of chert formation. The chemistry of fine quartz dust (FQD) provides a chemical mechanism for the transformation of FQD to polymorphs of silica in chert; FQD is readily dissolved, then reprecipitated as Opal-A by either biotic or abiotic processes. An unequivocal relation between increases in dust flux and biogenic opal-A in the western Pacific Ocean during the past 200 kyr... Tags: Africa, Energy Resources, Geochemistry, International, Soil Sciences, All tags... USGS Science Data Catalog (SDC), aridity, chalcedony, chemistry, chert, deposition, dust, eolian, flocculates, gypsum, loess, microcrystalline, opal, porcellanite, quartz, silica polymorphs, silt, wind, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, KS 1955 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, Downloadable Data, GeoPDF, GeoTIFF, Gypsum, All tags... Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, KS, Map, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, KS 1955 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, Downloadable Data, GeoPDF, GeoTIFF, Gypsum, All tags... Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, KS, Map, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, CO 1962 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, CO, Downloadable Data, GeoPDF, GeoTIFF, All tags... Gypsum, Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, Map, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, OH 1969 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, Downloadable Data, GeoPDF, GeoTIFF, Gypsum, All tags... Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, Map, OH, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, CO 1962 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, CO, Downloadable Data, GeoPDF, GeoTIFF, All tags... Gypsum, Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, Map, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, CO 1962 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, CO, Downloadable Data, GeoPDF, GeoTIFF, All tags... Gypsum, Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, Map, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, OH 1959 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, Downloadable Data, GeoPDF, GeoTIFF, Gypsum, All tags... Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, Map, OH, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, CO 1962 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, CO, Downloadable Data, GeoPDF, GeoTIFF, All tags... Gypsum, Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, Map, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, OH 1969 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, Downloadable Data, GeoPDF, GeoTIFF, Gypsum, All tags... Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, Map, OH, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, KS 1955 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, Downloadable Data, GeoPDF, GeoTIFF, Gypsum, All tags... Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, KS, Map, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, CO 1962 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, CO, Downloadable Data, GeoPDF, GeoTIFF, All tags... Gypsum, Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, Map, imageryBaseMapsEarthCover, Fewer tags USGS 1:24000-scale Quadrangle for Gypsum, OH 1969 USGS Historical Quadrangle in GeoPDF. Tags: 7.5 x 7.5 minute, Downloadable Data, GeoPDF, GeoTIFF, Gypsum, All tags... Historical Topographic Maps, Historical Topographic Maps 7.5 x 7.5 Minute Map Series, Map, OH, imageryBaseMapsEarthCover, Fewer tags