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  • 1
    Online Resource
    Online Resource
    Supercontinent cycles through earth history (2016)
    London : Geological Society
    Details Availability
    Keywords: Aufsatzsammlung ; Paläogeografie ; Kontinentalverschiebung ; Plattentektonik ; Akkretion ; Kraton ; Paläotektonik ; Pangaea ; Rodinia ; Geochronologie ; Paläomagnetismus ; Tektonik
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource
    Series Statement: Geological society special publications 424
    URL: http://sp.lyellcollection.org/content/424/1
    DOI: 10.1144/SP424.0
    DDC: 551.136
    RVK:
    TG 3200
    Language: English
    Note: Dateiformat Volltext: PDF, abstracts
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  • 2
    Electronic Resource
    Electronic Resource
    A plate-tectonic speed limit? (1993)
    [s.l.] : Nature Publishing Group
    Nature 363 (1993), S. 216-217 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Estimates of the minimum velocities of lithospheric plates before the age of the oldest sea floor can be made using paths of apparent polar wander1-2. Today, plates containing a significant amount of continental crust2 (〉 2 x 107 km2) are known to move at speeds approaching those of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/363216a0
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Early history of the eastern Sibao Orogen (South China) during the assembly of Rodinia: New mica 40Ar/39Ar dating and SHRIMP U–Pb detrital zircon provenance constraints (2007)
    Elsevier
    In:  Precambrian Research, 159 (1-2). pp. 79-94.
    Details
    Publication Date: 2015-11-24
    Description: The Sibao Orogen in South China is one of the poorest known Grenville-aged orogenic belts through which the Neoproterozoic supercontinent Rodinia assembled. We report here the first UV laser spot 40Ar/39Ar mica and SHRIMP U–Pb zircon ages from a rare Grenville-aged metamorphic complex, the Tianli Schists, in the eastern Sibao Orogen. Our U–Pb zircon provenance ages indicate that the protolith of the Tianli Schists was a clastic sedimentary succession most likely derived from the Yangtze Block. The depositional age of the protolith is younger than 1530 Ma, as constrained by the youngest detrital zircon grains, but is older than 1040 Ma as constrained by the oldest 40Ar/39Ar muscovite ages. The Yangtze Block provenance for the Tianli Schists suggests that the Sibaoan ophiolitic complexes in northeastern Jiangxi, the ca. 970 Ma Xiwan adakitic granite intrusions, and the ca. 900 Ma(?) Xiwan blueschists, all to the northwest of the study region, were likely formed during the closure of a back-arc basin along the margin of the Yangtze Block. Our in situ UV laser 40Ar/39Ar results from S1 and S2 muscovites suggest that the Tianli Schists underwent metamorphism and deformation at 1042 ± 7 Ma to 1015 ± 4 Ma, the oldest known metamorphic event in the eastern Sibao Orogen. Muscovite/biotite cooling ages of ca. 968 ± 4 and 942 ± 8 Ma are recorded by deformed and recrystallised muscovite and biotite, respectively, indicating tectonic reactivation before 900 Ma, during the later stages of the Sibao Orogeny. Together with previous results from the western Sibao Orogen, our work suggests that the closure of the ocean between the Yangtze and Cathaysia Blocks during the assembly of Rodinia was diachronous: ≥1000 Ma at the western Sibao Orogen and ca. 900 Ma at the eastern Sibao Orogen.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.precamres.2007.05.003
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Late Neoproterozoic 40{degrees} intraplate rotation within Australia allows for a tighter-fitting and longer-lasting Rodinia (2011)
    Geological Society of America (GSA)
    Details
    Publication Date: 2011-01-01
    Description: Previous paleomagnetic work has appeared to demand the breakup of southwest United States-East Antarctic (SWEAT) type Rodinia reconstructions before ca. 750 Ma, significantly earlier than the stratigraphic record of rift-drift transition between 715 Ma and 650 Ma. Here we reanalyze Australian paleomagnetic and regional tectonic data to produce a model in which the Precambrian Australian continent had a slightly different configuration before the breakup of Rodinia. A cross-continental megashear zone developed along the Paterson and Petermann orogens at ca. 650-550 Ma, during or after the breakup of Rodinia, manifested as an [~]40{degrees} clockwise rotation of the South and West Australian cratons relative to the North Australian craton around a vertical axis in Central Australia. This model reconciles major paleomagnetic discrepancies within Australia, and allows for a longer lifespan of SWEAT-like reconstructions of Rodinia that are consistent with the Neoproterozoic stratigraphic records of Australia and Laurentia.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 5
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    Nonglacial origin for low-{delta}18O Neoproterozoic magmas in the South China Block: Evidence from new in-situ oxygen isotope analyses using SIMS (2011)
    Geological Society of America (GSA)
    Details
    Publication Date: 2011-08-01
    Description: Low-{delta}18O signatures in supracrustal rocks have been used as geochemical proxies for cold paleoclimates, e.g., glaciations. Unusual low-{delta}18O values found in Neoproterozoic igneous rocks in parts of the South China Block have thus been genetically linked to Neoproterozoic glaciation events. However, we report here new oxygen isotope compositions from Neoproterozoic magmatic zircons in central southern China using in-situ techniques that argue against such an interpretation. Our results show that (1) low-{delta}18O magmatic zircons started to appear in the South China Block from ca. 870 Ma, coinciding with the tectonic switching from Sibao orogenesis to postorogenic extension, which occurred more than 150 m.y. prior to the first glaciation event. The most abundant low-{delta}18O magmatic zircons have ages of 800-700 Ma. (2) The 830-700 Ma magmatic zircons are characterized by their bimodal nature of oxygen isotope compositions, i.e., mantle-like {delta}18O values (+4.4{per thousand} to +5.8{per thousand}) and high-{delta}18O values (+9.3{per thousand} to +10.8{per thousand}). (3) A sharp temporal change in maximum zircon {delta}18O values in the South China Block coincided with the onset of continental rifting and the possible arrival of a plume head. (4) No negative {delta}18O zircons have been identified in this study, contrary to previous studies. These features strongly argue against a glaciation origin for low to negative {delta}18O values in Neoproterozoic magmatic zircons from southern China. We propose that two stages of high-temperature water-magma interaction during plume-driven magmatism and continental rifting best explain the low-{delta}18O magmas. The most important implication of this study is that formation of such low-{delta}18O magmatic zircons was not necessarily related to glacial events and should not be used as a geochemical proxy for a cold paleoclimate.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 6
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    Formation of high {delta}18O fayalite-bearing A-type granite by high-temperature melting of granulitic metasedimentary rocks, southern China (2011)
    Geological Society of America (GSA)
    Details
    Publication Date: 2011-10-01
    Description: The genesis of A-type granites has been controversial. Fayalite granite is a member of the most reduced A-type granites, commonly thought to have been primarily sourced from tholeiitic rocks. In this paper we report petrography, whole-rock geochemistry, Sr-Nd isotope, and in situ zircon Hf-O isotope results for a fayalite-bearing A-type granite suite at Jiuyishan in southern China. High zircon {delta}18O (8.0{per thousand}-9.8{per thousand}), negative zircon {varepsilon}Hf(t) (-6.2 to -2.3), and evolved whole-rock Sr-Nd isotopes (ISr = 0.7151-0.7181; {varepsilon}Nd(t) = -7.4 to -6.6) indicate the reworking of old supracrustal rocks. Isotopic and geochemical results, particularly downward inflections of Zr and Ba at [~]70 wt% SiO2, point to fractional crystallization rather than magma mixing as the controlling process for the evolution of the igneous suite. Integrated petrological, geochemical, and isotopic studies present the first convincing case that reduced A-type granites can also be generated by high-temperature (〉960 {degrees}C) melting of granulitic metasedimentary rocks, likely related to the upwelling of the asthenosphere and/or underplating and intrusion of basaltic melts. We emphasize that key factors for the genesis of this unique rock type are low oxygen fugacity (fO2), low fH2O, and high temperature.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 7
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    Pliocene-Quaternary crustal melting in central and northern Tibet and insights into crustal flow (2016)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2016-06-18
    Description: Article The role of the low velocity-high conductivity zones (LV–HCZs) in developing the Tibetan Plateau has remained controversial. Here, Wang et al. present new geochemical and petrological data that show the LV–HCZs are sources of partial melt thus giving insight into the development of the Tibetan Plateau. Nature Communications doi: 10.1038/ncomms11888 Authors: Qiang Wang, Chris J. Hawkesworth, Derek Wyman, Sun-Lin Chung, Fu-Yuan Wu, Xian-Hua Li, Zheng-Xiang Li, Guo-Ning Gou, Xiu-Zheng Zhang, Gong-Jian Tang, Wei Dan, Lin Ma, Yan-Hui Dong
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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