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  • 1
    Series available for loan
    Series available for loan
    Geodynamics of a cordilleran orogenic system: the central Andes of Argentina and northern Chile (2015)
    Boulder, Colo. : The Geological Soceity of America
    Associated volumes
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    Call number: S 90.0006(212)
    In: Memoir
    Description / Table of Contents: "This memoir brings together results from a multidisciplinary study of the processes that have formed the highest, widest part of the Andean Cordilleran orogenic belt in northern Argentina and Chile. The region features a tectonically erosive forearc, protracted arc magmatism, a high-elevation hinterland plateau and strongly shortened retroarc thrust belt, and a Paleocene-Recent foreland basin system"--
    Type of Medium: Series available for loan
    Pages: V, 490 S. , Ill., graph. Darst. , 29 cm
    ISBN: 9780813712123
    Series Statement: Memoir / Geological Society of America 212
    Classification:
    Geodynamics
    Language: English
    Note: Geodynamic models of Cordilleran orogens : gravitational instability of magmatic arc roots / Heather M. McPherson, Jonathan R. Pratt, Sharon Bywater-Reyes, and Estelle MortimerImaging the Nazca slab and surrounding mantle to 700 km depths beneath the central Andes (18°S to 28°S) / Alissa Scire, C. Berki Biryol, George Zandt, and Susan Beck -- Multiple styles and scales of lithospheric foundering beneath the Puna Plateau, central Andes / Susan L. Beck, George Zandt, Kevin M. Ward, and Alissa Scire -- Along-strike variation in crustal seismicity and modern lithospheric structure of the central Andes forearc / Kathryn Metcalf and Paul Kapp -- Along-strike variation in structural styles and hydrocarbon occurrences, Subandean fold-and-thrust belt and inner foreland, Colombia to Argentina / Michael F. McGroder, Richard O. Lease, and David M. Pearson -- U-Pb zircon geochronology of Neoproterozoic-Paleozoic sandstones and Paleozoic plutonic rocks in the central Andes (21°S-26°S) / Jesse C. Einhorn, George E. Gehrels, Antoine Vernon, and Peter G. DeCelles -- The origin and petrologic evolution of the Ordovician Famatinian-Puna arc / M.N. Ducea, J.E. Otamendi, G.W. Bergantz, D. Jianu, and L. Petrescu -- Foundering-driven lithospheric melting : the source of central Andean mafic lavas on the Puna Plateau (22°S-27°S) / Kendra E. Murray, Mihai N. Ducea, and Lindsay Schoenbohm -- Miocene-Pliocene shortening, extension, and mafic magmatism support small-scale lithospheric foundering in the central Andes, NW Argentina / Lindsay M. Schoenbohm and Barbara Carrapa -- Exhumation of the Precordillera and northern Sierras Pampeanas and along-strike correlation of the Andean orogenic front, northwestern Argentina / Roxana Safipour, Barbara Carrapa, Peter G. DeCelles, and Stuart N. Thomson -- Regional exhumation and kinematic history of the central Andes in response to cyclical orogenic processes / Barbara Carrapa and Peter G. Decelles -- Low-temperature thermochronologic trends across the central Andes, 21°S-28°S / P.W. Reiners, S.N. Thomson, A. Vernon, S.D. Willett, M. Zattin, J. Einhorn, G. Gehrels, J. Quade, D. Pearson, K.E. Murray, and W. Cavazza -- Climate and tectonics along the southern margin of the Puna Plateau, NW Argentina : origin of the late cenozoic Punaschotter conglomerates / Lindsay M. Schoenbohm, Barbara Carrapa, Heather M. McPherson, Jonathan R. Pratt, Sharon Bywater-Reyes, and Estelle Mortimer -- Testing the analytical protocols and calibration of volcanic glass for the reconstruction of hydrogen isotopes in paleoprecipitation / Matthew P. Dettinger and Jay Quade -- The growth of the central Andes, 22°S-26°S / J. Quade, M.P. Dettinger, B. Carrapa, P. DeCelles, K.E. Murray, K.W. Huntington, A. Cartwright. R.R. Canavan, G. Gehrels, and M. Clementz -- Lake formation, characteristics, and evolution in retroarc deposystems : a synthesis of the modern Andean orogen and its associated basins / Andrew Cohen, Michael M. McGlue, Geoffrey S. Ellis, Hiran Zani, Peter W. Swarzenski, Mario L. Assine, and Aguinaldo Silva -- Simulating foreland basin response to mountain belt kinematics and climate change in the Eastern Cordillera and Subandes : an analysis of the Chaco foreland basin in southern Bolivia / Todd M. Engelder and Jon D. Pelletier -- The Miocene Arizaro Basin, central Andean hinterland : response to partial lithosphere removal? / P.G. DeCelles, B. Carrapa, B.K. Horton, J. McNabb, G.E. Gehrels, and J. Boyd -- Hinterland basin formation and gravitational instabilities in the central Andes : constraints from gravity data and geodynamic models / Huilin Wang, Claire A. Currie, and Peter G. DeCelles -- Temporal growth of the Puna Plateau and its bearing on the post-Salta Rift system subsidence of the Andean foreland basin at 25°30°S / Thomas P. Becker, G. Gray, and D. Awwiller -- Cyclical orogenic processes in the Cenozoic central Andes / P.G. DeCelles, G. Zandt, S.L. Beck, C.A. Currie, M.N. Ducea, P. Knapp, G.E. Gehrels, B. Carrapa, J. Quade, and L.M. Schoenbohm..
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  • 2
    Electronic Resource
    Electronic Resource
    Active foundering of a continental arc root beneath the southern Sierra Nevada in California (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 431 (2004), S. 41-46 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Seismic data provide images of crust–mantle interactions during ongoing removal of the dense batholithic root beneath the southern Sierra Nevada mountains in California. The removal appears to have initiated between 10 and 3 Myr ago with a Rayleigh–Taylor-type instability, but ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02847
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  • 3
    Electronic Resource
    Electronic Resource
    The age and origin of a thick mafic–ultramafic keel from beneath the Sierra Nevada batholith (1998)
    Springer
    Contributions to mineralogy and petrology 133 (1998), S. 169-185 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract We present evidence for a thick (∼100 km) sequence of cogenetic rocks which make up the root of the Sierra Nevada batholith of California. The Sierran magmatism produced tonalitic and granodioritic magmas which reside in the Sierra Nevada upper- to mid-crust, as well as deep eclogite facies crust/upper mantle mafic–ultramafic cumulates. Samples of the mafic–ultramafic sequence are preserved as xenoliths in Miocene volcanic rocks which erupted through the central part of the batholith. We have performed Rb-Sr and Sm-Nd mineral geochronologic analyses on seven fresh, cumulate textured, olivine-free mafic–ultramafic xenoliths with large grainsize, one garnet peridotite, and one high pressure metasedimentary rock. The garnet peridotite, which equilibrated at ∼130 km beneath the batholith, yields a Miocene (10 Ma) Nd age, indicating that in this sample, the Nd isotopes were maintained in equilibrium up to the time of entrainment. All other samples equilibrated between ∼35 and 100 km beneath the batholith and yield Sm-Nd mineral ages between 80 and 120 Ma, broadly coincident with the previously established period of most voluminous batholithic magmatism in the Sierra Nevada. The Rb-Sr ages are generally consistent with the Sm-Nd ages, but are more scattered. The 87Sr/86Sr and 143Nd/144Nd intercepts of the igneous-textured xenoliths are similar to the ratios published for rocks outcroping in the central Sierra Nevada. We interpret the mafic/ultramafic xenoliths to be magmatically related to the upper- and mid-crustal granitoids as cumulates and/or restites. This more complete view of the vertical dimension in a batholith indicates that there is a large mass of mafic–ultramafic rocks at depth which complement the granitic batholiths, as predicted by mass balance calculations and experimental studies. The Sierran magmatism was a large scale process responsible for segregating a column of ∼30 km thick granitoids from at least ∼70 km of mainly olivine free mafic–ultramafic residues/cumulates. These rocks have resided under the batholith as granulite and eclogite facies rocks for at least 70 million years. The presence of this thick mafic–ultramafic keel also calls into question the existence of a “flat” (i.e., shallowly subducted) slab at Central California latitudes during Late Cretaceous–Early Cenozoic, in contrast to the southernmost Sierra Nevada and Mojave regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004100050445
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  • 4
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    1.57‐Ga Magmatism in the South Carpathians: Implications for the Pre‐Alpine Basement and Evolution of the Mantle under the European Continent: A Discussion (1999)
    University of Chicago Press
    Details
    Publication Date: 1999-11-01
    Print ISSN: 0022-1376
    Electronic ISSN: 1537-5269
    Topics: Geosciences
    Published by University of Chicago Press
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  • 5
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    Role Played by Strike-Slip Structures in the Development of Highly Curved Orogens: The Transcarpathian Fault System, South Carpathians (2016)
    University of Chicago Press
    Details
    Publication Date: 2016-07-01
    Print ISSN: 0022-1376
    Electronic ISSN: 1537-5269
    Topics: Geosciences
    Published by University of Chicago Press
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  • 6
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    Negligible surface uplift following foundering of thickened central Tibetan lower crust (2020)
    Geological Society of America
    Details
    Publication Date: 2020-08-25
    Description: This study used clinopyroxene (cpx) compositions and zircon Hf-O isotopes of Eocene adakitic rocks (EARs) from the Qiangtang block to resolve the mechanism(s) responsible for the formation of the central Tibetan Plateau. The two leading and opposing hypotheses for the origin of these rocks are (1) partially molten foundered lower crust, and (2) partial melting of continentally subducted upper crust. The consensus is that some crustal sources within the mantle have reached eclogite facies, while evidence remains insufficient. Reverse zonation for cpx in high Mg# andesitic samples shows a low Mg# core with lower Sr and Sr/Y than the high Mg# rim, suggesting derivation of parent magma by interaction between some eclogite-derived felsic melts and mantle peridotite. Overall, the mantle-like zircon δ18O (mean value of ~5.9‰) and εHf(t) (up to +6.7) values argue for a mafic source rather than buried upper-crustal rocks. Given the EARs were formed within a short time span after the end of crustal shortening, the original felsic melts were most likely derived from the foundered and eclogitized lower crust. The foundering process explains the early Eocene low-relief topography and the intermediate, eclogite-free modern crustal composition of central Tibet. Surface uplift as a response to lithosphere removal, however, was likely negligible, based on various lines of evidence, including sediment provenance, isotope paleoaltimetry, and thermochronology, perhaps because the central Tibetan crust was weak.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America
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  • 7
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    Significant Zr isotope variations in single zircon grains recording magma evolution history (2020)
    National Academy of Sciences
    Details
    Publication Date: 2020-08-18
    Description: Zircons widely occur in magmatic rocks and often display internal zonation finely recording the magmatic history. Here, we presented in situ high-precision (2SD
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 8
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    Fingerprinting orogenic delamination (2011)
    Geological Society of America (GSA)
    Details
    Publication Date: 2011-02-01
    Description: A significant portion of the Earth's lithosphere is recycled into the deeper mantle, as required by mass balance considerations in orogenic environments. The two principal mechanisms for recycling are subduction at plate margins and delamination. Subduction is a well-understood process that is essential to the plate tectonic engine of planet Earth. Delamination, on the other hand, requires recycling via convective removal of the lower parts of the lithosphere, and is more difficult to detect. One chief argument for delamination comes from extreme shortening at continental convergent margins, which requires far thicker mantle lithospheres than observed (DeCelles et al., 2009). The second argument comes from the intermediate average composition of the continental crust (Rudnick, 1995), which requires a large ultramafic complementary residue at the bottom of the continental crust; such a reservoir has not been identified over large portions of continental areas. Delamination (Bird, 1979), convective removal, foundering, and lithospheric dripping are terms used for the process of detachment and sinking of the lower parts of the continental lithosphere other than those that may have been buried into the mantle via continental subduction. Most researchers using the term "delamination" refer to a density-driven process of foundering, and do not imply its original "peeling-off" significance as defined by Bird (1979), which is closer to tectonic underplating in shallow subduction environments. Delamination is a form of vertical and spatially localized tectonics often generating amoeba-like or circular surface effects that are regional results of tectono-magmatic processes at convergent plate margins...
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 9
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    Stratigraphy, geochronology, and geochemistry of the Laramide magmatic arc in north-central Sonora, Mexico (2011)
    Geological Society of America (GSA)
    Details
    Publication Date: 2011-12-01
    Description: The Laramide magmatic arc in the Arizpe-Mazocahui quadrangle of north-central Sonora, Mexico, is composed of volcanic rocks assigned to the Tarahumara Formation and several granitic plutons that intrude it. The arc was built over juxtaposed crustal basements of the Caborca and Mazatzal provinces. A basal conglomerate of the 〉4-km-thick Tarahumara Formation overlies deformed Proterozoic igneous rocks and Neoproterozoic to Early Cretaceous strata, thus constraining the age of a contractional tectonic event that occurred between Cenomanian and early Campanian time. The lower part of the Tarahumara Formation is composed of rhyolitic ignimbrite and ash-fall tuffs, andesite flows, and interbedded volcaniclastic strata, and its upper part consists of rhyolitic to dacitic ignimbrites, ash-fall tuffs, and volcaniclastic rocks. The Tarahumara Formation shows marked lateral facies change within the study area, and further to the north it grades into the coeval fluvial and lacustrine Cabullona Group. The age of the Tarahumara Formation is between ca. 79 and 59 Ma; the monzonitic to granitic plutons have ages of ca. 71–50 Ma. The informally named El Babizo and Huépac granites, La Aurora and La Alamedita tonalities, and the Puerta del Sol granodiorite compose the El Jaralito batholith in the southern part of the area.Major and trace element composition of the Laramide igneous rocks shows calc-alkaline differentiation trends typical of continental magmatic arcs, and the isotope geochemistry indicates strong contribution from a mature continental crust. Initial 87Sr/86Sr values range from 0.70589 to 0.71369, and eNd values range from –6.2 to –13.6, except for the El Gueriguito quartz monzonite value, –0.5. The Nd, Sr, and Pb isotopic values of the studied Laramide rocks permit comparison with the previously defined Laramide isotopic provinces of Sonora and Arizona. The El Gueriguito pluton and Bella Esperanza granodiorite in the northeastern part of the study area along with plutons and mineralization of neighboring northern Sonora have isotopic values that correspond with those of the southeastern Arizona province formed over the Mazatzal basement (Lang and Titley, 1998; Bouse et al., 1999). Isotopic values of the other Laramide rocks throughout the study area are similar to values of provinces A and B of Sonora (Housh and McDowell, 2005) and to those of the Laramide Pb boundary zone of western Arizona, while the Rancho Vaquería and La Cubana plutons in the northernmost part of the area have the isotopic composition of the Proterozoic Mojave province of the southwestern United States. These data permit us to infer that a covered crustal boundary, between the Caborca block with a basement of the Mojave or boundary zone and the Mazatzal province, crosses through the northeastern part of the area. The boundary may be placed between outcrops of the El Gueriguito and Rancho Vaquería plutons, probably following a reactivated Cretaceous thrust fault located north of the hypothesized Mojave-Sonora megashear, proposed to cross through the central part of the area.
    Electronic ISSN: 1553-040X
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 10
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    Late Cretaceous gravitational collapse of the southern Sierra Nevada batholith, California (2012)
    Geological Society of America (GSA)
    Details
    Publication Date: 2012-04-01
    Description: The Sierra Nevada batholith is an ~600-km-long, NNW-trending composite arc assemblage consisting of a myriad of plutons exhibiting a distinct transverse zonation in structural, petrologic, geochronologic, and isotopic patterns. This zonation is most clearly expressed by a west-to-east variation from mafic to felsic plutonic assemblages. South of 35.5°N, the depth of exposure increases markedly, and fragments of shallow-level eastern Sierra Nevada batholith affinity rocks overlie deeper-level western zone rocks and subjacent subduction accretion assemblages along a major Late Cretaceous detachment system. The magnitude of displacement along this detachment system is assessed here by palinspastic reconstruction of vertical piercing points provided by batholithic and metamorphic pendant structure and stratigraphy. Integration of new and published U-Pb zircon geochronologic, thermobarometric, (U-Th)/He thermochronometric, and geochemical data from plutonic and metamorphic framework assemblages in the southern Sierra Nevada batholith reveal seven potential correlations between dispersed crustal fragments and the Sierra Nevada batholith autochthon. Each correlation suggests at least 50 km of south- to southwest-directed transport and tectonic excision of ~5–10 km of crust along the Late Cretaceous detachment system. The timing and pattern of regional dispersion of crustal fragments in the southern Sierra Nevada batholith is most consistent with Late Cretaceous collapse above the underplated accretionary complex. We infer, from data presented herein (1) a high degree of coupling between the shallow and deep crust during extension, and (2) that the development of modern landscape in southern California was greatly preconditioned by Late Cretaceous tectonics.
    Electronic ISSN: 1553-040X
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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