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Primary terms
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Stratigraphic Scheme of Cambrian Deposits, South of the Cis-Yenisei Area of West Siberia
Abstract This chapter traces the history of understanding the central terranes of New Zealand: Drumduan, Brook Street, Murihiku, Dun Mountain–Maitai and Caples. The terranes, mostly exposed in the South Island, are named from stratigraphic units of Late Paleozoic–Late Mesozoic age, including the Murihiku Supergroup, Brook Street Volcanics and Maitai groups, and the Dun Mountain ophiolite. European geologists in the mid-nineteenth century determined the stratigraphy of these rocks in the extremities of the island but in the succeeding half-century much effort was devoted to understanding widespread poorly fossiliferous ‘greywackes’: the ‘Maitai Controversy’. This was resolved in 1917 by palaeontology and the recognition of major faulting. In the 1940s the Alpine Fault, with an apparent 460 km dextral offset of the rocks at either end of the island, was recognized. In the following two decades, New Zealand was interpreted in terms of the geosynclinal hypothesis and then paired metamorphic belts. With plate tectonics, the basement rocks were assigned to terranes with the implication of being conveyed over considerable distances. The identification of source areas, coupled with the definition of the Cordilleran Median Batholith, has progressed the understanding of the present arrangement of the central terranes in the New Zealand part of Zealandia.
Subsidence dynamics of the Montney Formation (Early Triassic, Western Canada Sedimentary Basin): insights for its geodynamic setting and wider implications
Distribution of organic matter in Callovian–Lower Berriasian deposits of the western part of the Yenisei–Khatanga regional trough and adjacent areas of the West Siberian geosyneclise
Application of 3D seismic attribute analysis to structure interpretation and hydrocarbon exploration southwest Pennsylvania, Central Appalachian Basin: A case study
Abstract Much of today will be spent in the plutons that are the principal host rocks of the western margin of the Tuolumne Intrusive Complex ( Fig. 3-1 ). These include the Sentinel and Yosemite Creek granodiorites (Kistler, 1973; Bateman, 1992) and the Yosemite Valley Intrusive Suite ( Bateman, 1992 ). The Sentinel and Yosemite Creek Granodiorites were tentatively included as part of the Tuolumne by Kistler and Fleck (1994) and Bateman (1992), but assignment of these plutons to the Tuolumne has been hampered by lack of detailed study. We and our students and colleagues have been mapping and conducting focused studies on the petrology, geochemistry, and structure of both plutons recently, but the results are presently only in theses and abstracts (Petsche, 2008; Fulmer and Kruijer, 2009; Bliekendaal, 2012; van der Linde, 2012; Johnson, 2013). Reasonably accessible exposures of these units can be seen along Highway 120 within Yosemite National Park
Volcanism and glacial interaction in the Wells Gray–Clearwater volcanic field, east-central British Columbia
Abstract This field guide describes a three-day trip from Vancouver, British Columbia, to the Wells Gray–Clearwater volcanic field (WGCVF) in east-central British Columbia. The WGCVF is the site of transitional to alkali olivine basaltic volcanism erupted over the last three million years. The small volume magmas (<1 km 3 ) erupted along preexisting normal faults related to the late stages of Cordilleran terrane amalgamation, along the boundary between the miogeoclinal and pericratonic rocks of the Kootenay terrane and the allochthonous Slide Mountain and Quesnellia terranes west of ancestral North America. The magmas are highly enriched in incompatible elements, especially large-ion lithophile elements, and are interpreted as the result of low degrees of partial melting of a heterogeneous, metasomatized mantle. Upon ascent through the crust, they carried up both crustal and mantle xenoliths. During the eruptive period of the WGCVF, at least four glacial periods have occurred. The interplay between volcanism and glaciation is captured in the wide range of volcanic features found in the region. Field trip participants will view numerous diverse volcanic landforms and deposits: from tuyas to ice-marginal valley-edge deposits, volcanoclastic-lacustrine deposits, and associated pillow lavas and hyaloclastites.
Cambrian section in the east of the West Siberian geosyneclise ( based on data from Vostok 4 well )
Variations in the Illite to Muscovite Transition Related to Metamorphic Conditions and Detrital Muscovite Content: Insight from the Paleozoic Passive Margin of the Southwestern United States
Continental-scale detrital zircon provenance signatures in Lower Cretaceous strata, western North America
Detrital zircon geochronology of the western Ellesmerian clastic wedge, northwestern Canada: Insights on Arctic tectonics and the evolution of the northern Cordilleran miogeocline
SHRIMP U-Pb dating of recurrent Cryogenian and Late Cambrian–Early Ordovician alkalic magmatism in central Idaho: Implications for Rodinian rift tectonics
Anatomy and global context of the North American Cordillera
The Cordillera of western North America occupies the central 5000 km of the circum-Pacific orogenic belt, which extends for 25,000 km along a great-circle path from Taiwan to the Antarctic Peninsula. The North American Cordillera is anomalous because dextral transform faults along its western flank have supplanted subduction zones, the hallmark of circum-Pacific tectonism, along much of the Cordilleran continental margin since mid-Cenozoic time. The linear continuity of the Cordilleran orogen terminates on the north in the Arctic region and on the south in the Mesoamerican region at sinistral transform faults of Mesozoic and Cenozoic age, respectively. The Cordilleran margin of Laurentia was formed initially by rift breakup of the supercontinent Rodinia followed by development of the Neoproterozoic to early Paleozoic Cordilleran miogeocline along a passive continental margin, but it was modified in California and Mexico by Permian to Triassic transform truncation of Paleozoic tectonic trends. Late Paleozoic and Mesozoic accretion of oceanic island arcs and subduction complexes expanded the width of the Cordilleran orogen both before and after Triassic initiation of ancestral circum-Pacific subduction beneath the Cordilleran margin. Mesozoic to Cenozoic extensions and counterparts of Cordilleran accreted terranes extend southward into the Caribbean Antilles and northern South America. The development of successive forearc and retroforeland basins accompanied the progress of Cordilleran orogenesis over time, and coeval Mesozoic to Cenozoic batholith belts reflect continuing plate consumption at subduction zones along the continental margin. The assembly of subduction complexes along the Cordilleran continental margin continued into Cenozoic time, but dextral strike slip along the Pacific flank of the Cordilleran orogen displaced elongate coastal segments of the orogen northward during Cenozoic time. In the United States and Mexico, Laramide breakup of the Cordilleran foreland during shallow slab subduction and crustal extension within the Basin and Range taphrogen also expanded the width of the Cordilleran orogen during Cenozoic time.
Assembling and Disassembling California: A Zircon and Monazite Geochronologic Framework for Proterozoic Crustal Evolution in Southern California
The crystalline core of the North Cascades arc records the Cretaceous to Paleogene history of magmatism, deformation, and crustal growth along a segment of the North American Cordillera. The Nd isotopic compositions of granitoid plutons that intrude the Cascades core are a product of their source regions, and they provide probes of the crustal architecture. We present Sm-Nd isotopic data from 96 Ma to 45 Ma plutons and meta-igneous and metasedimentary terranes across the Cascades core. Sm-Nd data from all metamorphic terranes, excluding the much younger ca. 73 Ma Swakane terrane, yield mid-Cretaceous ε Nd values that range from +8.5 to −1.9 and indicate minor involvement of an enriched crustal component. Amphibolites from the Napeequa complex and Chiwaukum Schist yield near-depleted-mantle ε Nd values in the mid-Cretaceous, and ε Nd values from meta-clastic rocks from these terranes (+3.4 to −1.9) have an isotopic character that is intermediate between arc-derived and continental-shelf (miogeocline) sediments, reflecting a mixture of these two sources. Initial ε Nd values of the Swakane Gneiss range from +0.6 to −5.4 and reflect a significant input from the miogeocline. The initial ε Nd values of the Late Cretaceous to Paleogene plutons studied range from +1.5 to +6.3, consistent with geochemical studies that indicate the plutons were generated by mixing of mantle-derived melt and melt derived by anatexis of the underlying terranes. Initial ε Nd values of plutons from the NE part of the Cascades core generally decrease over time, suggesting a greater contribution of melt from evolved crustal sources, which may reflect a change in the physical parameters of melting. The metamorphic terranes of the North Cascades show a close affinity to the Late Triassic to Early Cretaceous arc terranes of the southern Coast Belt. The similarity in isotopic character supports the assumption that the North Cascades terranes formed in a position outboard of the North American craton but in close enough proximity to derive sediments from the miogeocline. Variations in Nd signature are also observed between the northern and southern Coast plutonic complex, and they indicate changes in the sources of crustal melting along the length of the Cretaceous arc.