Geochemical Survey of Missouri: Geochemistry of Bedrock Units in Missouri

Description: Geochemical Survey of Missouri: Geochemistry of Bedrock Units in Missouri and Parts of Adjacent States Distributions of elements were studied in 12 bedrock units of Precambrian and Paleozoic age in Missouri and adjacent parts of Kansas Oklahoma and Arkansas This work constituted one part of a larger study aimed at characterizing the broad scaled features of the geochemical landscape of Missouri Rock units sampled were granite and rhyolite of Precambrian age shale dolomite sandstone and sulfide ore of the Sauk sequence ( Cambrian to Early Ordovician in age); shale, carbonate and sandstone of the Tippecanoe sequence Middle Ordovician to Middle Devonian shale limestone sandstone and chert of the Kaskaskia sequence (Late Devonian to Late Mississippian); and shale carbonate sandstone and coal of Pennsylvanian age. Eleven of these units were sampled according to hierarchical sampling schemes explicitly designed to estimate proportions of geochemical variation occurring at various geographic scales. The most important scale of geochemical variation is a local one that reflects a common tendency in sedimentary rocks for closely spaced samples to vary rather widely in their proportions of the common rock forming minerals calcite dolomite quartz and clay In fact for many trace elements in many of the units studied samples collected as much as 100 km apart are expected to vary in their geochemical properties little more than samples collected within a kilometer or two of each other Regional geochemical variation reflects the contrasting lithology of the largely argillaceous units of Pennsylvanian age in the northern and western parts of the study area and the largely calcareous units of the Kaskaskia Tippecanoe and Sauk sequences in the southern and eastern parts.

Price: 10.85 USD

Location: San Diego, California

End Time: 2024-09-29T18:28:01.000Z

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