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Full-Text Articles in Physical Sciences and Mathematics
How Often Do Radioisotope Ages Agree? A Preliminary Study Of 29,000 Radioisotope Ages In The Usgs National Geochronological Database, Micah D. Beachy, Benjamin R. Kinard, Paul A. Garner
How Often Do Radioisotope Ages Agree? A Preliminary Study Of 29,000 Radioisotope Ages In The Usgs National Geochronological Database, Micah D. Beachy, Benjamin R. Kinard, Paul A. Garner
Proceedings of the International Conference on Creationism
In young-earth analyses of radioisotope age discordance, there have not yet been statistical studies involving age information for large numbers of rock units at a time. Austin (2005), Snelling (2005) and others have published in-depth studies of discordance on individual rock units, including new radioisotope ages based on their own samples. This was a logical approach because it maximized the number of ages per rock unit and eliminated the potential “file drawer” problem where ages that differ wildly from the expected values may be less likely to be published. Nevertheless, we believe it is time for a larger-scale project that …
Late Neoarchean To Middle Paleoproterozoic Geology Of Devon And Ellesmere Islands, Canadian Arctic, Joshua P. Laughton
Late Neoarchean To Middle Paleoproterozoic Geology Of Devon And Ellesmere Islands, Canadian Arctic, Joshua P. Laughton
Electronic Thesis and Dissertation Repository
The northernmost exposure of the Laurentian shield in Canada outcrops on Devon and Ellesmere islands within the Canadian Arctic Archipelago. Due to the remote location, the basement rocks of these islands have received little attention. From this study, zircon crystallization ages demonstrate that Devon Island is underlain by a late Neoarchean terrane comprising orthogneisses emplaced at ca. 2.55–2.51 Ga and an interleaved metasedimentary sequence deposited at ca. ≥2.47 Ga. On northern Devon Island, younger metasedimentary sequence(s) were deposited at ca. 2.2–1.9 Ga and intruded by ca. 2.01–1.95 Ga granitoids. Devon and Ellesmere islands experienced widespread metamorphic activity associated with the …
U-Pb Zircon Geochronology And Structure Of Regional Blueschist Units In The Easton Metamorphic Suite, Northwest Cascades, Wa, Katherine Lang
U-Pb Zircon Geochronology And Structure Of Regional Blueschist Units In The Easton Metamorphic Suite, Northwest Cascades, Wa, Katherine Lang
WWU Graduate School Collection
The Easton metamorphic suite of the Northwest Cascades Thrust System (NWCS) is a well-preserved subduction accretion complex in Washington State. The regional blueschist units of the Easton metamorphic suite include the Mt. Josephine semi-schist, Darrington Phyllite, and Shuksan greenschist/blueschist and all are interpreted to have accreted after the onset of Jurassic subduction beneath North America. This study uses zircon U-Pb geochronology, structure, and field observations to test the regional correlations between units in the Easton metamorphic suite and address models for the timing of subduction accretion along the North American margin in the Late Jurassic – Early Cretaceous. The results …