Details of Hydrochemical Variations in Flowing Wells     

J. Marcus Marsh  John W. Lloyd 《Ground water》1980,18(4):366-373

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Radium isotopes in sub-Arctic waters     

Willard S. Moore  Herbert W. Feely  Yuan-Hui Li 《Earth and Planetary Science Letters》1980,49(2):329-340

Measurements of the²²⁸Ra/²²⁶Ra activity ratio in the waters of the Greenland, Norwegian and Labrador Seas and Baffin Bay reveal strong horizontal gradients in the surface waters. The coastal waters are dominated by²²⁸Ra injection from nearshore sediments. There is an inverse correlation between the²²⁸Ra/²²⁶Ra activity ratio and salinity in the 30–36‰ salinity range. Vertical profiles indicate that the²²⁸Ra/²²⁶Ra activity ratio is also strongly coupled toσ_θ except for some regions where²²⁸Ra is being injected into higher density water as these isopycnals intersect coastal areas. We use these measurements in the area of formation of North Atlantic Deep Water to estimate that this water mass forms with a²²⁸Ra/²²⁶Ra activity ratio of 0.10.  相似文献   

²²⁶Ra behavior in the Pee Dee River-Winyah Bay estuary     

Robert J. Elsinger  Willard S. Moore 《Earth and Planetary Science Letters》1980,48(2):239-249

Concentrations of dissolved²²⁶Ra in Winyah Bay, South Carolina, and in the adjacent Atlantic Ocean are augmented by the desorption of radium from sediments in the low-salinity area of the estuary and diffusion from bottom sediments. Desorption of²²⁶Ra is reflected by lower concentrations in suspended sediments from higher-salinity regions of the estuary. Bottom sediments from the high-salinity region have lower²²⁶Ra/²³⁰Th activity ratios than those from the low-salinity end.The shape of the dissolved²²⁶Ra vs. salinity profile is influenced by the river discharge. During average-discharge conditions, desorption of²²⁶Ra from suspended and bottom sediments increases the dissolved²²⁶Ra concentrations by a factor of 3.5 as the water passes through Winyah Bay. High river discharge produces an initial increase of dissolved²²⁶Ra by a factor of 2 to 3 and apparently reflects only desorption from suspended sediments. By driving the salt wedge down the estuary and reducing the zone of contact of salt water with bottom sediments, the high-flow conditions sharply reduce the flux of²²⁶Ra from bottom sediments.  相似文献   

Growth rates of manganese nodules in Oneida Lake,New York     

Willard S. Moore  Walter E. Dean  S. Krishnaswami  D.V. Borole 《Earth and Planetary Science Letters》1980,46(2):191-200

²²⁶Ra is used to document the growth histories of six manganese nodules from Oneida Lake, New York. Detailed sectioning and analysis reveal that there are discontinuous gradients in²²⁶Ra content in these samples. These gradients result from periods of rapid growth (>1 mm/100 years) separated by periods of no growth of erosion. Although the²²⁶Ra “age” of the nodules approximates the age of Oneida Lake, the nodules are not sediment-covered because they occur only in areas of the lake where fine-grained sediments are not accumulating.  相似文献   

Toxicity of No. 2 fuel oil to coon stripe shrimp     

J.R. Vanderhorst  C.I. Gibson  L.J. Moore 《Marine pollution bulletin》1976,7(6):106-108

Bioassay of a No. 2 fuel oil dispersion with shrimp in a continuous flow system using measured waterborne oil as the indicator of oil concentrations reveals a treatment more definable than those previously described in terms of volume ratios and produces lower lethal concentrations. Shrimp 96-h LC₅₀ was 0.8 mg/l in this study as compared to values from 1.5 to 50 mg/l reported for other methods. Mean concentrations in tests do not give significant differences in concentration with respect to day of the test or spatial distribution in the exposure tanks.  相似文献   

The EEC bathing water directive     

B. Moore 《Marine pollution bulletin》1977,8(12):269-272

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Pliocene and Pleistocene diatom datum levels from the equatorial Pacific     

Lloyd H. Burckle 《Quaternary Research》1977,7(3):330-340

Eight diatom and two silicoflagellate datum levels from the Pliocene and Pleistocene of the equatorial Pacific are ranked and related to the paleomagnetic reversal record, calcium carbonate fluctuations, and the oxygen isotope record. The datum levels and their position with respect to the paleomagnetic reversal record are as follows: (1) last occurrence of Thalassiosira convexa midway between the top of the Gauss and the base of the Olduvai; (2) transition from Rhizosolenia praebergonii to Rhizosolenia praebergonii var. A just below the base of the Olduvai; (3) first appearance of Pseudoeunotia doliolus in the lower part of the Olduvai; (4) last occurrence of Rhizosolenia praebergonii just above the Olduvai; (5) first appearance of Asteromphalus hiltonianus midway between the top of the Olduvai and the base of the Jaramillo; (6) first appearance of Mesocena elliptica just below the base of the Jaramillo; (7) last occurrence of Mesocena elliptica midway between the top of the Olduvai and the base of the Brunhes; (8) upward increase in abundance of Thalassiosira oestrupii just below the base of the Olduvai; (9) last occurrence of Nitzschia reinholdii just above the base of the Olduvai; (10) peak occurrence of Roperia tesselata var. ovata just above Datum Level 9. By second-order correlation it is possible to relate these datum levels to the oxygen isotope record. Such a correlation suggests that some datum levels may be climate related.  相似文献   

Three varieties of alpine-type ultramafic rocks in the Norwegian Caledonides and basal gnesis complex     

Alan C. Moore  Henning Qvale 《Lithos》1977,10(2):149-161

Three varieties of alpine-type ultramafic rocks are distinguish in the Norwegian Caledonides associated Basal Gneiss Complex. Type one rocks have primary (magmatic) olivine, clinopyroxene, orthopyroxene and chromite, and are partly or completely serpentinised. They are found exclusively in rocks of Cambro-Silurian age. Type two are polymetamorphic metaperidotites or sagvandites consisting of olivine, enstatite and carbonate minerals, with talc and amphibole commonly being present. They are found in medium- to high-grade metamorphic rocks. Type three also show a metamorphic mineral association of olivine, orthopyroxene and minor chromite, while clinopyroxene, amphibole and chrome-bearing chlorite may also be present in some samples. Garnet may or may not occur and, where present, is often surrounded by reaction rims of spinel and amphibole. The type three ultramafic bodies are serpentinised to varying degrees and occur in high-grade metamorphic gneisses which may also contain eclogites and anorthosites. Distinction of these three varieties of ultramafic body may be useful for correlation purposes and for more detailed studies on the nature of their metamorphism.  相似文献   

Carbon and sulfur in the Swaziland sequence     

Carleton B Moore  Charles F Lewis  Keith A Kvenvolden 《Precambrian Research》1974,1(1):49-54

Sedimentary and igneous rocks of the Swaziland Sequence of South Africa (>3,200 my. old) contain total carbon (0.09–8.28%), organic carbon (0.04–1.95%) and sulfur (9–53,000 ppm). Amounts of organic carbon are generally high in the lower part of the Sequence (based on two samples from the Theespruit Formation). Sulfur content varies widely with no obvious correlations or trends. These rocks may contain clues to the early carbon and sulfur cycles on earth.  相似文献   

A review of aridity and groundwater     

J. W. Lloyd 《水文研究》1986,1(1):63-78

Surface hydrological studies are seen as inadequate in hyperarid and arid areas to provide reliable estimates of recharge. In most such areas surface discharges are not present so that assessments of groundwater resources are dependent upon ground interpretation and denied the flow control found in assessments elsewhere. Groundwater models show that gradients are sustained by long-term dewatering and very small amounts of modern indirect recharge. Recharge indications are well within the error of a hydrological balance. Discharges appear equally small. The development of groundwater in arid areas frequently faces problems of salination due to recycling of irrigation water and rising groundwater heads. Abstraction is often inadequately managed so that uncontrolled mining of groundwater occurs. The advantage that groundwater has, however, is that it offers staged development and staged appraisal.  相似文献