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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Canada
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Arctic Archipelago (1)
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Eastern Canada
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Baffin Island (2)
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Nunavut
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Europe
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Western Europe
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North America
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Ogilvie Mountains (1)
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elements, isotopes
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isotope ratios (5)
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Ca-44/Ca-40 (1)
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Li-7/Li-6 (1)
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Mg-26/Mg-24 (1)
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isotopes
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Ca-44/Ca-40 (1)
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Li-7/Li-6 (1)
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O-18/O-16 (1)
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lithium
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alkaline earth metals
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calcium
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Ca-44/Ca-40 (1)
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magnesium
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Mg-26/Mg-24 (1)
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strontium
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Sr-87/Sr-86 (2)
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platinum group
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osmium
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Os-188/Os-187 (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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North America
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Ogilvie Mountains (1)
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oxygen
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O-18/O-16 (1)
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paleobotany (1)
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Plantae
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Precambrian
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Reconstructing Neoproterozoic seawater chemistry from early diagenetic dolomite
ABSTRACT The North Slope subterrane of Arctic Alaska extends from the northeastern Brooks Range of Alaska into adjacent Yukon, Canada, and includes a pre-Mississippian deep-water sedimentary succession that has been historically correlated with units exposed in the Selwyn basin of northwestern Laurentia. Sedimentary provenance data, including Sm-Nd isotopes and major and trace element geochemistry, provide detailed geochemical characterization of the regional pre-Mississippian strata of the North Slope subterrane. Combined with paleontological and geochronological age constraints, these new data record a marked shift in provenance in the Ordovician–Devonian(?) Clarence River Group, evidently linked to an influx of juvenile, arc-derived material. The timing and nature of this provenance change are consistent with early Paleozoic tectonic reconstructions of the Arctic margin that restore the North Slope subterrane to northeastern Laurentia (present coordinates), proximal to the Appalachian-Caledonian orogenic belt. Such a restoration requires significant post-Early Devonian sinistral strike-slip displacement to later incorporate the North Slope subterrane into the composite Arctic Alaska terrane.
ABSTRACT New zircon U-Pb dates from the Mount Fitton, Mount Sedgwick, Mount Schaeffer, Old Crow, and Dave Lord plutons indicate that granitoids of the Old Crow plutonic suite in northern Yukon were emplaced in the North Slope subterrane of the Arctic Alaska composite terrane between 375 ± 2 Ma and 368 ± 3 Ma. Whole-rock major and trace element and Nd-Sr isotope geochemistry, combined with zircon trace element and Hf isotope geochemistry, indicate magma genesis involved significant contribution from older continental crust. Samples from the five plutons yield whole-rock εNd (t) values from -3.9 to -11.6 and 87 Sr/ 86 Sr (i) ratios of 0.7085–0.7444 and 0.8055. Zircon εHf (t) values range from -6.2 to -13.3. These North Slope subterrane granitoids are generally younger and isotopically more evolved than felsic rocks in the Coldfoot and Hammond subterranes of the southern Brooks Range (Arctic Alaska terrane), but in part are coeval with felsic rocks on the Seward and Chukotka peninsulas. The North Slope granitoids are also coeval and geochemically similar to arc magmatism in the Yukon-Tanana terrane in Yukon and on Axel Heiberg and northern Ellesmere islands, Nunavut. The Old Crow plutonic suite is interpreted as part of a Late Devonian arc system developed along the Arctic and Cordilleran margins. Late Devonian plutons were most likely emplaced after initial translation of the North Slope subterrane along the northern Laurentian margin. The plutons lie within or north of the Porcupine shear zone and thus do not limit post-Late Devonian displacement on the boundary between the North Slope subterrane and northwestern Laurentia.