Geology topics
S. E. Church
Publications and source records attributed to S. E. Church.
Contour maps of analytical results for stream sediments and panned concentrates from stream sediments, and plots of the mineralogy of the nonmagnetic, heavy-mineral concentrates from stream sediments from the Glacier Peak Wilderness Study Area, Washington
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Mineral resource potential of the Indian Heaven Roadless Area, Skamania County, Washington
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Mineral resource potential of the Tatoosh Roadless Area, Lewis County, Washington
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Mineral resource potential of the Glacier View Roadless Area, Pierce County, Washington
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Geochemical and statistical analysis of analytical results for stream sediments, panned concentrates from stream sediments, rocks, and waters collected from the Goat Rocks Wilderness and adjacent roadless areas, Lewis and Yakima Counties, Washington
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Analytical results for stream sediments, panned concentrates from stream sediments, and rocks collected from the Wonder Mountain Roadless Area (6086), Washington
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Analytical results for stream sediments and panned concentrates from stream sediments collected from the Glacier Peak Wilderness and adjacent areas, Washington
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Lead isotope relations in oceanic Ridge basalts from the Juan de Fuca-Gorda Ridge area N.E. Pacific Ocean
Lead isotopic analyses of a suite of basaltic rocks from the Juan de Fuca-Gorda Ridge and nearby seamounts confirm an isotopically heterogeneous mantle known since 1966. The process of mixing during partial melting of a heterogeneous mantle necessarily produces linear data arrays that can be interpreted as secondary isochrons. Moreover, the position of the entire lead isotope array, with respect to the geochron, requires that U/Pb and Th/Pb values are progressively increased over the age of the earth. Partial melting theory also dictates analogous behavior for the other incompatible trace elements. This process explains not only the LIL element character of MOR basalts, but also duplicates the spread of radiogenic lead data collected from alkali-rich oceanic basalts. This dynamic, open-system model of lead isotopic and chemical evolution of the mantle is believed to be the direct result of tectonic flow and convective overturn within the mantle and is compatible with geophysical models of a dynamic earth.