Geochemical survey of Missouri; methods of sampling, laboratory analysis, and statistical reduction of data, with sections on laboratory methods

Miesch, A.T.; Barnett, Paul R.; Bartel, Andreas; Dinnin, J.I.; Feder, Gerald L.; Harms, Torsten; Huffman, Claude; Janzer, V.J.; H, Millard; Neiman, H.G.; Skougstad, MW; Wahlberg, J.S.

doi:10.3133/pp954a

Cited by 83 publications

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“…Other samples containing anomalous amounts of copper include rock and soil samples over the Gra9a and Zambujal ore bodies and samples from an area near a known nearsurface sulfide deposit northwest of the town of Monte dos Mestres. [Values preceded by 'Vindicate that the element was not detected at the lower limit of detennination shown; these values were replaced with values equal to seven-tenths of the lower detennination limit (Miesch, 1976) in determining geometric means and geometric deviations] Lead. Soil leachates contain anomalous amounts of lead over the Grafa orebody, over the southern part of the Neves orebody, and northwest of A Do Neves ( fig.…”

Section: Results Of Analysis Of 4 N Hcl Leachatesmentioning

confidence: 99%

“…Concentration ranges for most of the elements listed in the tables fall within the analytical determination limits of the method used; however, some elements for several samples were reported as not detected at the lower limit of determination. For statistical computations, these qualified values were arbitrarily replaced with real values equal to 0.7 times the lower determination limit, as described by Miesch (1976). Univariate analysis of these data was used to obtain basic element-distribution information.…”

Section: Results Of Biogeochemical Studymentioning

confidence: 99%

“…Univariate analysis of these data was used to obtain basic element-distribution information. Inspection of frequency-distribution histograms and the general [Values preceded by "<" indicate that the element was not detected at the lower limit of determination shown; these values were replaced with values equal to seven-tenths of the lower determination limit (Miesch, 1976) agreement between the median and geometric mean for most of the elements indicated lognormal distribution of the data. Cumulative frequency plots helped determine the threshold value between anomalous and background populations for each element.…”

Section: Results Of Biogeochemical Studymentioning

confidence: 99%

“…17). The highest concentrations of copper in this area are from samples collected from a [Values preceded by 'Vindicate that the element was not detected at the lower limit of determination shown; these values were replaced with values equal to seven-tenths of the lower determination limit (Miesch, 1976) pump, near A Do Corvo, at site 8 (9 |ig/L), and from a well located adjacent to the Ribeira de Oeiras, at site 9 (8 |ig/L). By contrast, the geometric mean for copper in water is 3.3 |ig/L (table 5).…”

Section: Results Of Hydrogeochemical Studymentioning

confidence: 99%

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Advances in research on mineral resources, 1994

Berger¹

1994

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Cover. Part of a color shaded-relief aeromagnetic map of north-central Minnesota. Color changes represent broad changes in magnetic field strength. The warm colors (red, orange, and yellow) represent areas of magnetic field highs; the cool colors (green, blue, and purple) represent magnetic field lows.[From Horton, R.J., Day, W.C., and Bracken, R.E., Aeromagnetic survey of north-central Minnesota, chap. T of Scott, R.W., Jr., Detra, P.S., and Berger, B.R., eds., Advances Related Geographic landscapes change only slowly, but political and economic landscapes can change abruptly and unexpectedly The geological sciences are contributors to changes in these landscapes, but they also serve as a source of information on which an informed polity may base decisions on behalf of a society. The U.S. Geological Survey (USGS) is dedicated to providing information for the public good in all aspects of the geological sciences, including mineral resources.Mineral resources are a part of the geosciences that impact all aspects of a society from national economic security to national defense to land-use decisions to health and welfare these impacts affect not just humans but all other animals as well as all flora. Minerals are an essential part of the well-being of both a society and the Earth. They serve as the basis for infrastructure, technological innovation and development, economic policies, national defense, and national economic security; they are also essential to informed decisions on environmental risk and environmental tradeoffs in any decision-making process.The USGS provides mineral resource information, knowledge, and technical analyses from highly trained scientists with broad-ranging technical skills to Federal, State, and local governments; industries; schools and universities; and the general public of the United States. It also engages in cooperative studies with other countries and their institutions to provide training, exchange information and understanding, and attack important scientific problems. This Bulletin, Advances in research on mineral resources, 1994, reports progress on some of the current domestic and international research activities of the Office of Mineral Resources, Geologic Division of the USGS. ESTABLISHING A GEOLOGIC FRAMEWORK FOR MINERAL DEPOSITSSince the emergence of economic geology as a recognized subdiscipline within the earth-science research community within the last century, there has been heated debate about the role of igneous processes in the genesis of deposits that are spatially associated with intrusions and volcanic rocks. Do the metals in most deposits come from magmas, or is the magma merely a partial contributor or simply a heat engine? Even the use of sophisticated new technologies in the post-World War II era has not caused the issue to wither. Although there are stable-isotope methodologies to fingerprint probable water sources and radiogenic methodologies that reveal the source of some metals (and most deposits and rocks can now be dated with high precision), the...

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Section: Results Of Analysis Of 4 N Hcl Leachatesmentioning

confidence: 99%

Section: Results Of Biogeochemical Studymentioning

confidence: 99%

Section: Results Of Biogeochemical Studymentioning

confidence: 99%

Section: Results Of Hydrogeochemical Studymentioning

confidence: 99%

See 2 more Smart Citations

Advances in research on mineral resources, 1994

Berger¹

1994

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show abstract

“…Thus, because of insufficient analytical sensitivity, Se contents may be reported as less than some specified lower limit; these values are said to be "censored" or "qualified." For studies that contain censored data, the geometric mean and geometric deviation were estimated by using the technique of Cohen (1959), as described by Miesch (1967). This technique includes all the data in the calculation of the mean, not just the uncensored data, and involves an adjustment of the summary statistics that have been computed for the uncensored data.…”

Section: Analytical Sensitivitymentioning

confidence: 99%