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Research about Missouri

Source-linked reports with geographic coverage including Missouri.

At least 523 records · Page 29Linked to original sources
USGS1969

Micromineralogy of silver-bearing sphalerite from Flat River, Missouri

Detailed mineralogical and chemical study of sphalerite-rich lead ores from Flat River, Mo., confirms the presence of anomalous amounts of silver in the sphalerite. Although silver is closely associated with chlorine and no silver sulfide minerals were identified, geochemical considerations indicate the silver may be in the form of discrete submicron-size grains of sulfide rather than chloride. However, the close correlation between abundance variations in silver, chlorine, cadmium, iron, and minor lead suggests the possible existence of submicron-size grains of a complex chloride or oxychloride. Results from detailed chemical study of sphalerite show: (1) chlorine is present in areas containing silver and changes in abundance of both elements are similar; (2) the mole ratio of chlorine to silver varies from approximately 3:1 to 6:1 with an approximate average of 5:1 and the total content of each element varies widely between grains and within the same grain; (3) taking total silver in any analysis and calculating the amount of chlorine required for silver chloride leaves an excess of chlorine; (4) in chlorine-deficient areas the amounts of iron and cadmium substituting for zinc in the sphalerite structure vary widely; and (5) in areas containing chlorine, changes in abundance of iron and cadmium vary directly with that of chlorine. The fine-grained dusty opaque inclusions characterize sphalerite from this area; they were identified as mainly galena with lesser amounts of pyrite and cassiterite. Galena is silver-free (<0.02 weight percent Ag) and is essentially pure lead sulfide. Other sulfides identified include pyrite, a cobalt-nickel-iron sulfide of composition Co (sub 0.55) Ni (sub 0.25) Fe (sub 0.20) S (sub 2.00), and an iron-cobalt-nickel sulfide containing 22-28 weight percent Fe, 10-15 weight percent Co, and 3-5 weight percent Ni. Anomalous amounts of tin present as cassiterite are associated with the gangue minerals quartz, potash feldspar, a kaolinite-type clay, and trace amounts of cuprite. Carbonate gangue minerals include calcite, dolomite, ankerite, magnesite, and minor amounts of cerussite. Chemical analyses were made of many minerals and physical and textural relationships examined.

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USGS1969

Floods in Gravois Creek Basin, St. Louis County, Missouri

The rapid growth of suburban St. Louis presents problems in the social and economic development of flood plains within the area. The U.S. Geological Survey, in cooperation with the Metropolitan St. Louis Sewer District, is conducting a study of the hydrology of five major drainage basins within the area of responsibility of the Sewer District. This interim report presents stage and inundation data along Gravois Creek and its tributaries for the historic flood of June 1957, and the flood of January 1969. These data can be useful in studies leading to the proper utilization of the basin to minimize future flood problems. Other useful hydrologic data such as flood discharges and frequencies are being gathered, but were not available for this report. Spencer and Hauth (1969) described the flood situation in Maline Creek basin, St. Louis County, Mo. Areas covered by both reports are shown in figure 1.

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USGS1969

Geochemical survey Of Missouri; plans and progress for first six-month period (July-December 1969)

This compilation briefly describes the objectives and purpose of a reconnaissance geochemical survey of Missouri, the results of the survey for the first 6 months, and the expenditures in funds and personnel for the present fiscal year and, as anticipated, for the fiscal year beginning on July 1, 1970. It is prepared primarily for the information of the Environmental Health Center of the University of Missouri in the interest of continuing communication at both the administrative and scientific levels.

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USGS1969

Geochemical survey of Missouri, plans and progress for seventh six-month period (June-December 1972)

This is the seventh and last in a series of progress reports describing the current results of our reconnaissance geochemical survey of the State of Missouri. The survey was initiated on July 1, 1969, and consists of comprehensive field studies in four research areas-rocks, waters, soils and plants. It was undertaken to provide both a geochemical setting for epidemiological studies by personnel of the Environmental Health Surveillance Center and also a test of the feasibility of broad-scale geochemical surveys in large, geologically diverse regions.

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USGS1968

Floods in Maline Creek Basin, St. Louis County, Missouri

The rapid growth of suburban St. Louis presents problems in the economic development of flood plains within the area. The U.S. Geological Survey in cooperation with the Metropolitan St. Louis Sewer District has a project to study the hydrology of five major drainage basins within the area of responsibility of the Sewer District. This report presents hydrologic data on two flood events that can be used in evaluating the extent and depth of flooding with respect to a given stage in the Maline Creek basin. The report will aid decision making in the utilization of flood plains by providing data necessary to solve existing flood problems, and for regulating usage of flood plains to minimize the creation of new flood problems. Data are presented which will be useful in flood-plain zoning and building regulations, locating disposal facilities, locating recreational areas, designing storm and sanitary sewers, and for future bridge and culvert design.

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USGS1967

Closed system differentiation of sulfides in olivine Diabase, Missouri

Two small bodies of Precambrian basic intrusive rock in southeastern Missouri show uninterrupted differentiation of olivine diabase that produced ferrogabbro. Olivine diabase , foliated gabbro and coarse gabbro constitute the major textural rock types. Gravitational settling of plagio-clase, olivine and Fe-Ti oxides occurred in both intrusives and iron enrichment is a conspicuous feature. Plagioclase ranges from An58 to An35 and olivine varies from Fa36 to Fa57. Because these rocks were intruded into volcanic rocks at a substantial depth and were slowly cooled in an apparently closed system , they afford an opportunity to trace the differentiation trends exhibited by the disseminated sulfides . Pyrrhotite, chal-copyrite, pentlandite, sphalerite and cubanite are the most abundant sulfides deposited initially as unmixed sulfide solid solutions which were essentially coprecipitates with the major silicates. Paragenesis and abundance of primary sulfides are directly related to the differentiation parameters shown by the silicates. The extreme fractionation of these intrusives did not lead to a large concentration of any of the sulfides at any stage during consolidation.

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USGS1966

Surface water records of Missouri, 1964

The quality-of-water investigations of the U.S. Geological Survey are concerned with the chemical and physical characteristics of surface and ground water supplies of the Nation. The basic records for the 1964 water year for quality of surface waters within the State of Missouri are given in this report. The data were collected and computed by the Water Resources Division of the U.S. Geological Survey, under the direction of John H. Hubble, district chemist. The Geological Survey began publishing annual basic records of chemical quality, water temperatures, and suspended sediment in 1941 in the water-supply-paper series, "Quality of Surface Waters of the United States." The records for Missouri were first published in this series in 1948 when the records were being published in two volumes for the entire country. Beginning in 1950, the records were published in four volumes. Since 1959 these records have been published in five volumes; each volume covering an area where boundaries coincide with those of certain natural drainage areas. The records for Missouri are contained in Parts 5-6, 7 and 8 of the water-supply series. These publications are available in most major public libraries, (See "Water-Supply Papers" p. 11). Distribution of this report is limited and it is primarily for local and immediate use. The records will be published in the Geological Survey water-supply papers at 5-year intervals, The first compilation will cover only the years 1964 and 1965.

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USGS1964

Low-amplitude aeromagnetic anomalies in Southeastern Missouri

This study shows that aeromagnetic anomalies of less than 200 gammas are associated with topographic relief of exposed Precambrian granitic and volcanic rocks of the St. François Mountains. Anomalies resulting from hills coarsely crystalline granite are as high as 100 gammas in amplitude , whereas anomalies over comparable hills of fine-grained rocks, such as granophyre or devitrified volcanic rock, are as much as 200 gammas. Anomalies caused by normal faulting or shearing of igneous rocks have amplitudes of less than 100 gammas; they are observed best in profile. These anomalies are superposed on larger magnetic features related to pendants of volcanic rock in the roof of a granite batholith and are distinguished from large lateral variations in magnetic intensity by their low amplitude and small areal extent. Analyses of the compound anomalies yielded the subsurface configuration of isolated roof pendants of resistant extrusive rock in some areas. As many of these pendants have negligible remanent magnetization, induction theory was used in the analyses. Application of these results to the lead-mining areas shows that aeromagnetic patterns of low amplitude can guide mineral exploration in the region flanking the Ozark uplift, where isolated, buried hills of Precambrian igneous rocks controlled the development of some lead-bearing sedimentary structures in the overlying Cambrian carbonate strata.

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USGS1964

Dichlobenil as a herbicide in fish habitats

Application of 20 to 40 lb/A dichlobenil made prior to emergence accomplished various degrees of control of pondweeds ( Potamogeton diversifolius , P. foliosus , P. pectinatus , P. pusillus ) and a slender naiad ( Najas flexilis ). Coontail ( Ceratophyllum demersum ) was affected only by the higher dosage. Limited control and growth inhibition was achieved on several forms of algae in early spring applications. However, applications made to rooted submersed aquatic plants and filamentous algae ( Cladophora , Pithophora and Chara ) at postemergence stage of development had little herbicidal effect. Dichlobenil was not acutely toxic to fish at herbicidal concentrations. The range of median tolerance limits was 10 to 20 ppmw for pumpkinseed ( Lepomis gibbosus ), bluegill ( L. macrochirus ), redear sunfish ( L. microlophus ), and largemouth bass ( Micropterus salmoides ).

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USGS1963

Annual production by a cottontail population

Adult females in a cottontail ( Sylvilagus floridanus ) population produced seven or eight litters during the 1961 breeding season. A synchrony of the conception dates was maintained throughout the breeding season. Data about ovulation rate, prenatal mortality, and litter size for each litter are presented. The first litter was smallest, averaging about three young, and the remaining litters ranged between five and six young. The last four litters may be slightly smaller than the second and third litters of the season. The total annual production of young by an adult female would be approximately 35.

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USGS1954

Low-water study, Spring River basin, Missouri

Because of the severe drought conditions and the turmoil brought about by it, observations of discharge were made at 46 points within that part of the Spring basin that lies within the State of Missouri. Three of these measurements were made at regular gaging stations.

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