Geology Reports⌕ Search

Geology topics

David F. Siems

Publications and source records attributed to David F. Siems.

11 recordsLinked to original sources
USGS2002

Whole-rock and glass major-element geochemistry of Kilauea Volcano, Hawaii, near-vent eruptive products: September 1994 through September 2001

This report presents major-element geochemical data for glasses and whole-rock aliquots among 523 lava samples collected near the vent on Kilauea's east rift zone between September 1994 and October 2001. Information on sample collection, analysis techniques and analytical standard reproducibility are presented as a PDF file, which also includes a detailed explantion of the categories of sample information presented in the database spreadsheet. The sample database is downloadable as a separate Microsoft Excel file.

Hawai'i↗
USGS1986

Geochemical maps showing distribution and abundance of bismuth and beryllium in the nonmagnetic fraction of stream-sediment concentrates, Silver City 1 degree by 2 degrees Quadrangle, New Mexico and Arizona

These maps (Maps A and B) show the distribution and abundance of bismuth and beryllium in the nonmagnetic fraction of heavy-mineral concentrates from stream sediments collected in the Silver City 1 o x 2 o quadrangle, New Mexico and Arizona. Geochemical maps showing the distribution and abundance of nine other selected key elements and the mineral flourite in the Silver City quadrangle are also part of this folio (Watts and Hassemer, 1980; Watts and others 1986a-i). These maps contribute to the assessment of mineral resources within Silver City 1 o x 2 o quadrangle by (1) showing regional patterns of elements enriched in heavy-mineral concentrates, thereby providing clues to regional patterns of mineralization; (2) showing new areas containing enriched metals, not previously known from mining activity; and (3) providing supportive data to the interpretive and summary maps (Watts and Hassmer, 1986) and the mineral resource assessment (Richter and others, 1983). Background information that pertains to published components of the Silver City Folio is also available (Richter and others, in press).

Arizona, New Mexico↗
USGS1986

Geochemical maps showing distribution and abundance of tin in two fractions of stream-sediment concentrates, Silver City 1 degree by 2 degrees Quadrangle, New Mexico and Arizona

These maps (Maps A and B) show the distribution and abundance tin in the nonmagnetic and magnetic fractions of heavy-mineral concentrates from stream sediments collected in the Silver City 1 o x 2 o quadrangle, New Mexico and Arizona. Geochemical maps showing the distribution and abundance of 10 other selected key elements and the mineral fluorite in the Silver City quadrangle are also part of this folio (Watts and Hassemer, 1980; Watts and others 1986a-i). These maps contribute to the assessment of mineral resources within Silver City 1 o x 2 o quadrangle by (1) showing regional patterns of elements enriched in heavy-mineral concentrates, thereby providing clues to regional patterns of mineralization; (2) showing new areas containing enriched metals, not previously known from mining activity; and (3) providing supportive data to the interpretive and summary maps (Watts and Hassmer, 1986) and the mineral resource assessment (Richter and others, 1983). Background information that pertains to published components of the Silver City Folio is also available (Richter and others, in press).

Arizona, New Mexico↗
USGS1986

Geochemical maps showing distribution and abundance of manganese in two fractions of stream-sediment concentrates, Silver City 1 degree by 2 degrees Quadrangle, New Mexico and Arizona

These maps (Maps A and B) show the distribution and abundance of maganese in the nonmagnetic and magnetic fractions of heavy-mineral concentrates from stream sediments collected in the Silver City 1 o x 2 o quadrangle, New Mexico and Arizona. Geochemical maps showing the distribution and abundance of 10 other selected key elements and the mineral fluorite in the Silver City quadrangle are also part of this folio (Watts and Hassemer, 1980; Watts and others 1986a-i). These maps contribute to the assessment of mineral resources within Silver City 1 o x 2 o quadrangle by (1) showing regional patterns of elements enriched in heavy-mineral concentrates, thereby providing clues to regional patterns of mineralization; (2) showing new areas containing enriched metals, not previously known from mining activity; and (3) providing supportive data to the interpretive and summary maps (Watts and Hassmer, 1986) and the mineral resource assessment (Richter and others, 1983). Background information that pertains to published components of the Silver City Folio is also available (Richter and others, in press).

Arizona, New Mexico↗
USGS1986

Geochemical maps showing distribution and abundance of barium in two fractions of stream-sediment concentrates, Silver City 1 degree by 2 degrees Quadrangle, New Mexico and Arizona

These maps (Maps A and B) show the distribution and abundance barium in the nonmagnetic and magnetic fractions of heavy-mineral concentrates from stream sediments collected in the Silver City 1 o x 2 o quadrangle, New Mexico and Arizona. Geochemical maps showing the distribution and abundance of 10 other selected key elements and the mineral fluorite in the Silver City quadrangle are also part of this folio (Watts and Hassemer, 1980; Watts and others 1986a-i). These maps contribute to the assessment of mineral resources within Silver City 1 o x 2 o quadrangle by (1) showing regional patterns of elements enriched in heavy-mineral concentrates, thereby providing clues to regional patterns of mineralization; (2) showing new areas containing enriched metals, not previously known from mining activity; and (3) providing supportive data to the interpretive and summary maps (Watts and Hassmer, 1986) and the mineral resource assessment (Richter and others, 1983). Background information that pertains to published components of the Silver City Folio is also available (Richter and others, in press).

Arizona, New Mexico↗