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  • 1
    Description / Table of Contents: Some 75 years after the visionary work of Wegener and du Toit, Neoproterozoic to Mesozoic geological correlations between South America and Africa are re-examined in the light of plate tectonics and modern geological investigation (structural and metamorphic studies, stratigraphic logging, geochemistry, geochronology and palaeomagnetism). The book presents both reviews and new research relating to the shared Gondwana origins of countries facing each other across the South Atlantic Ocean, especially Brazil, Argentina, Cameroon, Nigeria, Angola, Namibia and South Africa. This is the first comprehensive treatment to be readily available in book form. It covers the common elements of cratonic areas pre-dating Gondwana, and how they came together in late Precambrian and Cambrian times with the formation of the Pan-African/Brasiliano orogenic belts (Dom Feliciano, Brasília, Ribeira, Damara, Gariep, Kaoko, etc.). The subsequent shared Palaeozoic and Mesozoic sedimentary record (Karoo system) prior to Gondwana break-up is also reviewed.
    Pages: Online-Ressource (VII, 422 Seiten)
    ISBN: 9781862392472
    Language: English
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  • 2
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    PANGAEA
    In:  Supplement to: O'Nions, R K; Pankhurst, R J (1976): Sr isotope and rare earth element geochemistry of DSDP Leg 37 basalts. Earth and Planetary Science Letters, 31(2), 255-261, https://doi.org/10.1016/0012-821X(76)90217-X
    Publication Date: 2023-06-27
    Description: 87Sr/S6Sr ratios have been determined on eleven whole rock basalt samples from DSDP Leg 37. The 87Sr/S6Sr ratios range from 0.70305 +/- 4 to 0.70451 +/- 4 due to alteration and contamination with seawater Sr. Leaching with 5% HF has only a small effect on the 87Sr/86Sr of the samples. However, treatment with 6M HCl in acid digestion bombs at 130°C removes the contaminant more effectively. Altered plagioclase and olivine are dissolved during this process. The mean 87Sr/86Sr of four HCl-treated samples from hole 332A is 0.70299 and that for five samples from hole 332B is 0.70297. The 87Sr/86Sr ratios of treated samples from holes 333A and 335 are 0.70304 +/- 4 and 0.70316 +/- 4, respectively. These 87Sr/86Sr ratios are within the range observed for other basalts elsewhere along the Mid-Atlantic Ridge in the North Atlantic. REE distribution patterns have been determined for four samples, three from hole 332B and one from hole 335. CeN/YbN ratios range from 0.58 to 1.30 and do not correlate with 87Sr/86Sr ratios. The source regions of these basalts appear to have been variable in REE abundances.
    Keywords: 37-332A; 37-332B; 37-333; 37-333A; 37-335; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg37; North Atlantic; North Atlantic/VALLEY
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 3
    Publication Date: 2023-06-27
    Keywords: 37-332A; 37-332B; 37-333; 37-335; Comment; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Leg37; Lithology/composition/facies; North Atlantic; North Atlantic/VALLEY; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 23 data points
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  • 4
    Publication Date: 2023-06-27
    Keywords: 37-332A; 37-332B; 37-335; Comment; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Isotope ratio mass spectrometry; Leg37; North Atlantic; North Atlantic/VALLEY; Sample code/label; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
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  • 5
    Publication Date: 2023-06-27
    Keywords: 37-332A; 37-332B; 37-333A; 37-335; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Isotope ratio mass spectrometry; Leg37; North Atlantic; North Atlantic/VALLEY; Sample code/label; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error
    Type: Dataset
    Format: text/tab-separated-values, 58 data points
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  • 6
    Publication Date: 2023-06-27
    Keywords: 37-332B; 37-335; Cerium; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Dysprosium; Erbium; Europium; Event label; Gadolinium; Glomar Challenger; Isotope ratio mass spectrometry; Leg37; Neodymium; North Atlantic; North Atlantic/VALLEY; Samarium; Sample code/label; Ytterbium
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 287 (1980), S. 279-284 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A combined Nd- and Sr-isotope study of Caledonian granites in Scotland and northern England demonstrates the importance of continental crust in their petrogenesis and places limits on the involvement of contemporary mantle-derived ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 237 (1972), S. 446-447 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Much discussion of lunar basalt genesis is centred on Rb-Sr isotope systematics. In particular, it is often said that most whole rocks have model ages, relative to the initial 87Sr/86Sr ratio of basaltic achondrites (BABI=0.69898), of about 4.6 aeon. The best fit isochron to eleven mare-type ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 227 (1970), S. 1269-1270 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Keys of the traditional kind are often not available for specialists or students in the less popular branches of biology. There are shortcomings in such keys, even when they are available: (a) the key may not entirely agree with the corresponding description, because of the complexity of the task ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 262 (1976), S. 124-126 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A large collection of Nuk gneisses was made by us in 1973 from the area between Buksefjord and Sermilik (Fig. 1, also Table 1, Numbers 4, 5, 6). Some of these samples are from localities where Chadwick et al.7 believed they had unequivocal evidence for remobilisation of Amitsoq gneiss. A more ...
    Type of Medium: Electronic Resource
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