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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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Western Canada
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British Columbia (1)
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North America
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North American Cordillera (1)
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Roberts Mountains (1)
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Sierra Nevada (3)
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Twin Lakes (1)
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United States
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California
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Central California (1)
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Fresno County California (1)
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Inyo County California (1)
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Madera County California (1)
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Mariposa County California (1)
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Mono County California (1)
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San Bernardino County California (1)
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Sierra Nevada Batholith (1)
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Tulare County California (1)
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Tuolumne County California (1)
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Idaho (1)
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Mojave Desert (1)
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Western U.S. (1)
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elements, isotopes
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isotope ratios (1)
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isotopes
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stable isotopes
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Nd-144/Nd-143 (1)
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Sr-87/Sr-86 (1)
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large-ion lithophile elements (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (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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geochronology methods
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U/Pb (2)
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geologic age
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Mesozoic
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Cretaceous
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Upper Cretaceous
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Tuolumne Intrusive Suite (1)
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Jurassic (1)
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Paleozoic
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Carboniferous
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Mississippian
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Upper Mississippian
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Chesterian
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Golconda Formation (1)
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Permian
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McCloud Limestone (1)
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upper Paleozoic (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Neoproterozoic (1)
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igneous rocks
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igneous rocks
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plutonic rocks (1)
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volcanic rocks
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basalts
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mid-ocean ridge basalts (1)
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minerals
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (3)
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Primary terms
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absolute age (3)
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Canada
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Western Canada
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British Columbia (1)
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deformation (1)
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faults (1)
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igneous rocks
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plutonic rocks (1)
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volcanic rocks
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basalts
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mid-ocean ridge basalts (1)
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intrusions (1)
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isotopes
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stable isotopes
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Nd-144/Nd-143 (1)
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Sr-87/Sr-86 (1)
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magmas (1)
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Mesozoic
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Cretaceous
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Upper Cretaceous
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Tuolumne Intrusive Suite (1)
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Jurassic (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (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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North American Cordillera (1)
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Paleozoic
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Carboniferous
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Mississippian
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Upper Mississippian
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Chesterian
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Golconda Formation (1)
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Permian
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McCloud Limestone (1)
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upper Paleozoic (1)
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plate tectonics (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Neoproterozoic (1)
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sedimentary rocks
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chemically precipitated rocks
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chert (1)
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clastic rocks
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argillite (1)
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tectonics (2)
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United States
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California
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Central California (1)
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Fresno County California (1)
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Inyo County California (1)
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Madera County California (1)
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Mariposa County California (1)
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Mono County California (1)
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San Bernardino County California (1)
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Sierra Nevada Batholith (1)
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Tulare County California (1)
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Tuolumne County California (1)
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Idaho (1)
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Mojave Desert (1)
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Western U.S. (1)
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sedimentary rocks
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sedimentary rocks
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chemically precipitated rocks
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chert (1)
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clastic rocks
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argillite (1)
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Detrital zircon provenance and depositional links of Mesozoic Sierra Nevada intra-arc strata
ABSTRACT The Sierra Nevada batholith of California represents the intrusive footprint of composite Mesozoic Cordilleran arcs built through pre-Mesozoic strata exposed in isolated pendants. Neoproterozoic to Permian strata, which formed the prebatholithic framework of the Sierran arc, were emplaced against the tectonically reorganized SW Laurentian continental margin in the late Paleozoic, culminating with final collapse of the fringing McCloud arc against SW Laurentia. Synthesis of 22 new and 135 existing detrital zircon U/Pb geochronology sample analyses clarifies the provenance, affinity, and history of Sierra Nevada framework rocks. Framework strata comprise terranes with distinct postdepositional histories and detrital zircon provenance that form three broad groups: allochthonous Neoproterozoic to lower Paleozoic strata with interpreted sediment sources from Idaho to northern British Columbia; Neoproterozoic to Permian strata parautochthonous to SW Laurentia; and middle to upper Paleozoic deposits related to the fringing McCloud arc. Only three sedimentary packages potentially contain detritus from rocks exotic to western Laurentia: the Sierra City mélange, chert-argillite unit, and Twin Lakes assemblage. We reject previous correlations of eastern Sierra Nevada strata with the Roberts Mountains and Golconda allochthons and find no evidence that these allochthons ever extended westward across Owens Valley. Snow Lake terrane detrital ages are consistent with interpreted provenance over a wide range from the Mojave Desert to central Idaho. The composite detrital zircon population of all analyses from pre-Mesozoic Sierran framework rocks is indistinguishable from that of the Neoproterozoic to Permian SW Laurentian margin, providing a strong link, in aggregate, between these strata and western Laurentia. These findings support interpretations that the Sierran arc was built into thick sediments underpinned by transitional to continental western Laurentian lithosphere. Thus, the Mesozoic Sierra Nevada arc is native to the SW Cordilleran margin, with the Sierran framework emplaced along SW Laurentia prior to Permian–Triassic initiation of Cordilleran arc activity.
Day 6: Overview of arc processes and tempos
Abstract Our goals today are several-fold. We have now spent five days examining different parts of the Mesozoic Sierran arc, and hopefully discussions are already under way attempting to integrate both the shared and distinct characteristics of these individual magma plumbing systems and synchronous tectonics. We will briefly continue these discussions below. Our main focus will be to consider the arc as a whole and introduce a number of new regional data sets related to the tectonic and magmatic components of this arc. By the end of the day, we hope that our discussions have evolved to a consideration of the overall petrologic evolution of the arc, the tectonic and magmatic arc tempos, and their potential links. Without an airplane, or satellite, or Hollywood earth coring machine, it is difficult to take you to field locations where we can observe large sections of the arc. Instead, as we travel west back across the arc, we have selected a number of scenic overview stops, where we will introduce and discuss these new data sets while looking at gorgeous views of the arc…