Open-File Report 90-0234A Discussion (paper copy) 90-0234B Geochemical data files, ASCII, (1) 51/4" 360K floppy diskette 1990 Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards nor with the North American stratigraphic codes. Although these data have been used by the U.S. Geological Survey and have been successfully imported into a number of data base and spreadsheet programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
This final report summarizes the chemical data for 17 cores from Kentucky X (1), West Virginia (1), Pennsylvania (4), Ohio (4), New York (3), Tennessee (3) and Illinois (2). Major elements, for example Si and Al, show changes related to stratigraphic boundaries when the effect of organic matter, sulfur^ and carbonate are removed. The geochemical associations of trace elements with organic carbon and sulfide sulfur are shown in down-hole plots, minor or trace element vs organic C or sulfide S plots, and by statistical correlation. The uranium and molybdenum are most strongly related to organic carbon. Based on down-hole plots and statistics, sulfur seems to control the abundance of Hg, As, Cu, and Pb in some cores, and organic matter shows some control over Cu and Ni. Vanadium and zinc are usually related to organic carbon or sulfur or both. Carbon and sulfur contents and their ratios can be used to infer an environment of deposition using C/S plots and to show trace element pathway during deposition and diagenesis.
Ifalik Atoll-Tarang Bank and trends east-west. This segment consists of large carbonate(?) banks and atolls and is generally of less than 2500 m water depth. The western third of Caroline Ridge extends from Ifalik Atoll-Tarang Bank to the Yap trench and trends northwestward. This segment consists of a large shallow-water (<2500 m) ridge bounded by, and cut by, narrow troughs that represent strike-slip faults (southern margin; Hamiltonj 1985), normal faults (northern margin; Andrews, 1971), and small spreading basins. Seismic profiles presented here show that both the north and south flanks of Caroline Ridge are block faulted. The origin of the western two-thirds of Caroline Ridge is unknown. West Caroline Ridge was proposed to be a relict island arc by Bracey and Andrews (1974). However, Hamilton (1985) disagreed with their interpretation and speculated that the ridge represents a leaky transform fault that connects the Mussau and Mariana trenches. Perfit and Fornari (1982) called on a combination of leaky transform fault and hot spot volcanism to form the ridge. Hegarty and Weissel (1988) suggested that the western part of Caroline Ridge, as well as Eauripik Rise, formed when a melting anomaly passed beneath the Pacific plate during the late Oligocene. Our work indicates that west Caroline Ridge, Sorol Trough, and associated topographic features may represent an extinct(?) spreading centertransform fault system. Vogt et al. (1976) suggested this possibility in passing, but provided no corroborative evidence. Eauripik Rise may also be an extinct spreading center, one of three in the Caroline Basin, which is located south of Caroline Ridge (Winterer et al., 1971; Erlandson et al., 1976; Mammerickx, 1978). The Yap arc and trench represent an Oligocene(?) and Neogene convergent plate margin, but one that is distinct in many ways from other west anq southwest Pacific arcs (Cole et al., 1960; Johnson et al., 1960; Hawkins and Batiza, 1977). For example, the distance between the arc summit and trench axis is very narrow and subduction may have ended in the late Miocene. Also, many of the rocks recovered from the arc (inner trench wall, summit, and summit islands) are metamorphic rocks of greenschist and amphibolite grade (Johnson et al., 1960; Shiraki, 1971). Many of the volcanic rocks have an oceanic crust compositional signature and thus may be obducted oceanic crust (Hawkins and Batiza, 1977; Woridng group, 1977). Other rocks belong to the calc-alkaline and island arc tholeiite series (Beccaliva et al., 1980; Crawford et al., 1986). Rocks dredged from the outer trench slope have a MORB-like composition and are about 7 m.y. old (Beccaluva et al., 1980). Hydrothermal mineralization of Quaternary sandstones collected by us from the central Yap arc indicate that the suggestions that subduction ended in the late Miocene and that back-arc basin crust was obducted onto the volcanic arc need to be modified, or at least must account for Quaternary hydrothermal activity at the! summit of the arc (Hawkins and Batiza, 1977). | ...
This is a report on the geochemical data collected in the Hailey 1° x 2° quadrangle. Geochemical samples for the Hailey quadrangle were collected and analyzed under the Conterminous United States Mineral Assessment Program (CUSMAP). CUSMAP was initiated in 1977 to provide an assessment of the mineral resource potential of the United States.
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