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  • 1
    Series available for loan
    Series available for loan
    The petrology and age of alkaline mafic lavas from the nunatak zone of central East Greenland (1979)
    Koebenhavn
    Associated volumes
    Details Availability
    Call number: SR 90.0018(133)
    In: Bulletin
    Type of Medium: Series available for loan
    Pages: 28 S.
    Series Statement: Bulletin / Groenlands Geologiske Undersoegelse 133
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
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    (Table 1) Age determination of ODP Leg 134 volcanic rocks (1994)
    PANGAEA
    In:  Supplement to: Rex, D C (1994): K-Ar Age determinations of samples from Leg 134. In: Green, HG; Collot, J-Y; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 134, 413-414, https://doi.org/10.2973/odp.proc.sr.134.021.1994
    Details
    Publication Date: 2024-01-09
    Description: The K-Ar ages from the basaltic rocks of Leg 134 range from Miocene to Holocene (Table 1). Samples were selected in consultation with shipboard scientists; choice of the material from the forearc sites was very limited and confined to clasts. There was a wider choice of material from the sill at Site 833 in the North Aoba Basin.
    Keywords: 134-828A; 134-829A; 134-831B; 134-832B; 134-833B; Age, 40K/40Ar Potassium-Argon; Age, dated; Age, dated standard deviation; Argon-40; Coral Sea; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg134; Ocean Drilling Program; ODP; Potassium; Rock type; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 127 data points
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    DATA PANGAEA
  • 3
    Electronic Resource
    Electronic Resource
    Alpine metamorphism in the south-east Tauern Window, Austria: 2. Rates of heating, cooling and uplift (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of metamorphic geology 3 (1985), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract Existing geochronological data are reviewed and new Rb-Sr, K-Ar and 39Ar–40Ar ages are presented, including a suite of 33 mica ages from a 20 km north–south tunnel section. These data are discussed in relation to the thermal history from the overthrusting of the Autroalpine nappes c. 65 Myr ago to the present. The earliest phase of metamorphism, involving lawsonite crystallization, is associated with emplacement of these nappes. Subsequently, temperatures in the rocks beneath rose, at a mean rate of 3–6°C/Myr, until the climax of metamorphism.At high structural levels, published data indicate an age 〉 35 Myr for the metamorphic climax. In contrast, a new 39Ar–40Ar step-heating age of 23.8 ± 0.8 Myr on amphibole, from near the base of Peripheral Schieferhülle, closely approximates the age of metamorphism and provides the first clear indication that the climax of metamorphism occurred later at deeper structure levels. Following the climax, near-isothermal uplift and erosion reduced pressure to c. 1 kbar before white mica closure at 19 Myr; this implies uplift at 〉3 mm/yr.Along the tunnel section, white mica K-Ar ages vary systematically from 24 Myr to 16.5 Myr with position relative to a late 4 km amplitude dome whereas biotite Rb-Sr ages are uniform at 16.5 Myr across the whole profile; doming is thus dated at 16.5 Myr with transient uplift rates 〉5 mm/yr. At other times uplift rates were 〈1 mm/yr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1525-1314.1985.tb00327.x
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  • 4
    Electronic Resource
    Electronic Resource
    Age of volcanism and rifting in southwestern Ethiopia (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 657-658 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Afro-Arabian Rift System in southwestern Ethiopia is particularly wide and complex8, embracing from east to west the southern termination of the Main Ethiopian Rift (Ganjuli graben9,10), the Stefanie Rift, and three northward-terminating branches (Usno, Omo and Kibish) of the Turkana (Lake ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/283657a0
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  • 5
    Electronic Resource
    Electronic Resource
    Radiometric constraints on hydrothermal circulation in cooling granite plutons (1995)
    Springer
    Mineralium deposita 30 (1995), S. 460-468 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Improved precision of radiometric dating of ore deposits can provide information about the thermal history of hydrothermal circulation in cooling plutons. In Jales a Hercynian porphyritic two-mica granite and pre-Ordovician mica schists are cut and intensely altered by the Campo gold-quartz vein. The unaltered granite must be younger than 320 ± 6 Ma, and gives mica Rb-Sr ages of 308.5 ± 2.4 (1σ) Ma (muscovite) and 294.5 ± 1.1 Ma (biotite). Alteration muscovites from the granite give a weighted mean Rb-Sr age of 308.1 ± 1.5 Ma, and a mean 39Ar-40Ar age of 300.7 ± 2.8 Ma. Alteration muscovites from the mica schists give similar 39Ar-40Ar ages, averaging 303.0 ± 2.8 Ma. The results suggest that circulation of the Campo mineralising fluids took place no more than 2–4 Ma after the granite cooled through the muscovite Rb-Sr closure temperature, about 500 °C, and that subsequent cooling to biotite closure at about 300 °C took place at less than 14°C/Ma. The mean cooling rate following emplacement was 15 to 25 °C/Ma. The most detailed comparable published data, for the Cornubian ore field, imply much faster cooling rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196405
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  • 6
    Electronic Resource
    Electronic Resource
    New dates from the Ethiopian plateau volcanics (1974)
    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 218-219 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Profile locality map of Ethiopia. Table 1 Sample data Sample Profile Position in %K Vol. 40Ar 0/40 A r /o ^r Age(Myr) Petrography No. profile rad. s.c.c. rad. g-1 x 10-6 30410 Jijiga Second flow 0.93 0.8550 74.6 22.8 ±0.7 Fine-grained sparsely ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/252218a0
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  • 7
    Electronic Resource
    Electronic Resource
    Riftward younging of volcanic units in the Addis Ababa region, Ethiopian rift valley (1979)
    [s.l.] : Nature Publishing Group
    Nature 280 (1979), S. 284-288 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A general riftward younging of surficial volcanic units is a feature of the Addis Ababa sector of the Ethiopian rift valley. The narrowing of the volcanic zone with time is due to crustal necking and topographical ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/280284a0
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  • 8
    Electronic Resource
    Electronic Resource
    Subaqueous, basaltic lava dome and carapace breccia on King George Island, South Shetland Islands, Antarctica (1998)
    Springer
    Bulletin of volcanology 59 (1998), S. 245-261 
    Details
    ISSN: 1432-0819
    Keywords: Key words Lava dome ; Endogenous ; Basaltic ; Submarine ; Rheology ; Antarctica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  On King George Island during latest Oligocene/earliest Miocene time, submarine eruptions resulted in the emplacement of a small (ca. 500 m estimated original diameter) basalt lava dome at Low Head. The dome contains a central mass of columnar rock enveloped by fractured basalt and basalt breccia. The breccia is crystalline and is a joint-block deposit (lithic orthobreccia) interpreted as an unusually thick dome carapace breccia cogenetic with the columnar rock. It was formed in situ by a combination of intense dilation, fracturing and shattering caused by natural hydrofracturing during initial dome effusion and subsequent endogenous emplacement of further basalt melt, now preserved as the columnar rock. Muddy matrix with dispersed hyaloclastite and microfossils fills fractures and diffuse patches in part of the fractured basalt and breccia lithofacies. The sparse glass-rich clasts formed by cooling-contraction granulation during interaction between chilled basalt crust and surrounding water. Together with muddy sediment, they were injected into the dome by hydrofracturing, local steam fluidisation and likely explosive bulk interaction. The basalt lava was highly crystallised and degassed prior to extrusion. Together with a low effusion temperature and rapid convective heat loss in a submarine setting, these properties significantly affected the magma rheology (increased the viscosity and shear strength) and influenced the final dome-like form of the extrusion. Conversely, high heat retention was favoured by the degassed state of the magma (minimal undercooling), a thick breccia carapace and viscous shear heating, which helped to sustain magmatic (eruption) temperatures and enhanced the mobility of the flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004450050189
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  • 9
    Electronic Resource
    Electronic Resource
    Isotopic Ages of Minerals from the Pre-Cambrian Complex of the Malverns (1966)
    [s.l.] : Nature Publishing Group
    Nature 209 (1966), S. 605-606 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Pre-Cambrian of the Malverns occurs along a major north-south structural line, regarded as of Late-Carboniferous age5,6, but which must have been initiated earlier. To the east is Trias, and Cambrian and Silurian lie to the west. The eastern junction is most probably a fault6, as is much of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/209605a0
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  • 10
    Electronic Resource
    Electronic Resource
    Caledonian Magmatism in North Wales (1966)
    [s.l.] : Nature Publishing Group
    Nature 209 (1966), S. 866-868 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a survey of the British Caledonides, Read1 emphasized the need for more information, on the many aspects of Caledonian magmatism in Britain. He briefly discussed the few available isotopic ages for the Caledonian granites of the 'metamorphic' and 'non-metamorphic' belts, but pointed out that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/209866a0
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