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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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United States
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Palo Duro Basin (1)
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Texas
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Deaf Smith County Texas (1)
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elements, isotopes
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carbon
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C-14 (1)
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isotopes
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radioactive isotopes
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C-14 (1)
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geochronology methods
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K/Ar (1)
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Primary terms
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absolute age (1)
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carbon
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C-14 (1)
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earthquakes (1)
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engineering geology (2)
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faults (1)
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geochronology (1)
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isotopes
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radioactive isotopes
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C-14 (1)
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nuclear facilities (1)
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United States
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Palo Duro Basin (1)
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Texas
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Deaf Smith County Texas (1)
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waste disposal (2)
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Geology of the Potential Texas Nuclear Waste Repository Site
Practical Aspects of Geological Prediction
Dating techniques in fault investigations
Abstract Determining the time of most recent fault movement is an important part of assessing a possible site for a nuclear power plant. The purpose of this paper is not to present research information but to provide a practical guide to some of the dating techniques available to the engineering geologist working on nuclear power plant siting. Emphasis is placed on the practical aspects, such as usable minerals, conditions necessary for them to yield correct dates, degree of accuracy, sample collection, sample size, and sample packaging. In this paper, we have taken for granted the usual geologic field techniques—such as those used in stratigraphy, paleontology, and structural analysis—for assessing fault history. We discuss laboratory techniques used in conjunction with or supplemental to field methods. The specific radiometric methods discussed are 14 C (carbon-14), fission track, K-Ar (potassium-argon), thermoluminescense, Rb-Sr (rubidium-strontium), and U-Th (uranium-thorium). Racemization of amino acids, paleomagnetism, and fluid-inclusion techniques are the nonra-diometric methods that are discussed. Our experiences with some of these techniques are described as well.
Silurian and Devonian Stratigraphy in the Clinton Quadrangle, Central Massachusetts
Metasedimentary rocks of probable Silurian to Devonian age underlie about three-fourths of the Clinton quadrangle. Metamorphosed marine mudstone, siltstone, fine-grained graywacke, and limy siltstone form two thick sequences. Primary structures preserved within the rocks include compositional layering, laminations, tabular and lenticular beds, low-angle cross-stratification, and graded beds. The thicker sequence (4,570 m to 6,100 m) is divided into four units (in ascending order): (1) white to light-gray, very fine grained quartzite interlayered with minor thin beds of gray phyllite; (2) alternating very thin laminae of dark-gray to greenish-gray phyllite and light-brown ankeritic metasiltstone; (3) dark-gray carbonaceous slate and phyllite and minor interbedded metagraywacke; and (4) dark-gray phyllite with abundant chiastolite porphyroblasts and many beds of light-gray metagraywacke. Intrusive igneous rocks form the base of this sequence, and a fault at the top separates it from the other sequence. The second, thinner sequence (1,830 m) consists chiefly of thin-bedded biotitic feldspathic quartzite, greenish-to purplish-gray calc-silicate rock, and thin layers of biotite schist. These rocks are probably older than the rocks of the first sequence. The rocks of the second sequence previously were included in the Oakdale Quartzite, those of the first sequence in the Oakdale Quartzite and the Worcester Formation of central Massachusetts. They may be broadly correlative with parts of the Gonic, Rindgemere, Towow, Berwick and Eliot Formations and possibly with part of the Kittery Quartzite of southern New Hampshire and southwestern Maine.