Filters: Tags: 1900 - Geochemistry (X)7 results (274ms)
Sediment magnetic, paleomagnetic and geochemical results have beenobtained from lacustrine sediments recovered in a 30-meter coretaken by rotary drilling methods at Grass Lake, Siskiyou County,California. The data have been analyzed and interpreted in termsof environmental change in the Grass Lake catchment over the pastca. 100,000 years.
The drilling project at Owens Lake commenced in April,1991. This Open-File Report represents an effort to makeavailable to other researchers our preliminary datacollected during the first year of study followingcompletion of the core-drilling phase. Nineteen datacollections and preliminary interpretations are presentedin the following sections. They are the work of fifteenfirst-authors and their numerous co-authors. Broadly,their topics include a field log of the core(1 contribution), sedimentological analyses (1), clay-mineral identification (1), geochemical analyses (5),dating and age estimates of the cored sediments (4), andidentifications of fossil materials (7).
National Geochemical Atlas: The Geochemical Landscape of the Conterminous United StatesDerived from Stream Sediment and other Solid Sample Media Analyzed by the NationalUranium Resource Evaluation (NURE) Program
This CD presents maps derived from a subset of the National Uranium Resource Evaluation(NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) data.Approxiamately 260,000 samples were analyzed in the continental U.S. and consisted ofsolid samples, including stream, lake, pond, spring, and playa sediments, and soils.Data for eleven elements were analyzed and included on this release of the NationalGeochemical Atlas CD: Na, Ti, Fe, Cu, Zn, As, Ce, Hf, Pb, Th, and U.The National Uranium Resource Evaluation (NURE) program of the Department of Energy (DOE) collecteda vast amount of chemical data on sediment, soil, and water samples from the United States in thelate 1970's and early 1980's. This element of the...
Sediment Magnetic and Geochemical Data from Quaternary Lacustrine Sediment in Two Cores from Tule Lake, Siskiyou County, California
Sediment magnetic and geochemical results have been obtained fromthe top 60 meters of lacustrine sediments recovered in two coresfrom Tule Lake in northern California. The sediment magnetic andgeochemical data, presented here in tabular form, complementstudies of diatoms and pollen in the cores that are the bases forpublished paleoclimatic interpretations. This report alsodocuments the methods used to obtain the magnetic properties andgeochemical data.
This report summarizes data acquired from 1990 to 1994 forthe gas-hydrate portion of the USGS project "Permafrostand gas hydrate as possible sources of methane" of theUSGS Global Change and Climate History program. Theobjective of this project has been to test the hypothesisthat gas hydrate deposits of the Beaufort Sea continentalshelf are destabilized by the ~10�C temperature increasethat has resulted from the Holocene transgression of theArctic Ocean. To test this idea we have selected an areaoff the north coast of Alaska centered on Harrison Bay. Wehave measured the concentration of methane in surficialsediments, in the water column when ice is present andabsent, and in seasonal sea ice. Our results show thatmore...
This report summarizes data acquired from 1990 to 1994 for the gas-hydrate portion of the USGS project "Permafrost and gas hydrate as possible sources of methane" of the USGS Global Change and Climate History program. The objective of this project has been to test the hypothesis that gas hydrate deposits of the Beaufort Sea continental shelf are destabilized by the ~10°C temperature increase that has resulted from the Holocene transgression of the Arctic Ocean. To test this idea we have selected an area off the north coast of Alaska centered on Harrison Bay. We have measured the concentration of methane in surficial sediments, in the water column when ice is present and absent, and in seasonal sea ice. Our results...
Stratigraphy, Sedimentology, Paleontology, and Paleomagnetism ofPliocene-Early Pleistocene Lacustrine Deposits in Two Cores fromWestern Utah
The data contained in this report represent our preliminary findingsof the analyses of two cores of Pliocene and early Pleistocenesediments from the eastern Great Basin. This is a collaborativeproject involving specialists from the USGS, Kansas State University,and the University of California-Davis in paleontology (Thompson,Buchner, Forester, Bradbury), stratigraphy and sedimentology (Oviatt,Kelsey, Bracht), and paleomagnetism and environmental magnetism(Roberts).