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  • 1
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    West Gondwana: Pre-Cenozoic Correlations Across the South Atlantic Region (2008)
    London : The Geological Society
    Details
    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
    URL: http://sp.lyellcollection.org/content/vol294/issue1/
    Language: English
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    E-BOOK
  • 2
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    Strontium isotope and rare earth element geochemistry of basalts from DSDP Leg 37 (2008)
    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
    Details
    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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    DATA PANGAEA
  • 3
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    (Appendix) Sample description of DSDP Leg 37
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 4
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    (Table 2) 87Sr/86Sr ratios of leaching experiments with basalts from DSDP Leg 37
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 5
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    (Table 1) 87Sr/86Sr ratios of basalts from DSDP Leg 37
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 6
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    (Table 3) Rare earth element contents of basalts from DSDP Leg 37
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 7
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    Pacific subduction coeval with the Karoo mantle plume: the Early Jurasssic Subcordilleran belt of northwestern Patagonia (2007)
    In:  Geological Society Special Publication 246: 217-239.
    Details
    Publication Date: 2007-10-08
    Description: The Early Mesozoic magmatism of southwestern Gondwana is reviewed in the light of new U-Pb SHRIMP zircon ages (181 {+/-} 2 Ma, 181 {+/-} 3 Ma, 185 {+/-} 2 Ma, and 182 {+/-} 2 Ma) that establish an Early Jurassic age for the granites of the Subcordilleran plutonic belt in northwestern Argentine Patagonia. New geochemical and isotopic data confirm that this belt represents an early subduction-related magmatic arc along the proto-Pacific margin of Gondwana. Thus, subduction was synchronous with the initial phase of Chon Aike rhyolite volcanism ascribed to the thermal effects of the Karoo mantle plume and heralding rifting of this part of the supercontinent. Overall, there is clear evidence that successive episodes of calc-alkaline arc magmatism from Late Triassic times until establishment of the Andean Patagonian batholith in the Late Jurassic involved westerly migration and clockwise rotation of the arc. This indicates a changing geodynamic regime during Gondwana break-up and suggests differential rollback of the subducted slab, with accretion of new crustal material and/or asymmetrical scissor-like' opening of back-arc basins. This almost certainly entailed dextral displacement of continental domains in Patagonia.
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    PAPER
  • 8
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    Nd and Sr isotopic signatures of metasedimentary rocks around the South Pacific margin and implications for their provenance (2007)
    In:  Geological Society Special Publication 246: 113-141.
    Details
    Publication Date: 2007-10-08
    Description: An Nd-Sr isotope database, including c. 200 new analyses, is presented for Palaeozoic and Mesozoic metasedimentary successions extending through southeastern Australia, New Zealand, West Antarctica and the Antarctic Peninsula to southern South America. Combining with U-Pb detrital zircon age data, this enables characterization of New Zealand terranes, especially within the Eastern Province, where there is a progression from westernmost terranes of both volcanic/volcaniclastic and accretionary origin with primitive sediment sources, to easternmost terranes with mature continental sediment inputs. In southern South America, West Antarctica and the Antarctica Peninsula, similar accretionary complexes have Nd model ages principally reflecting mixing of sedimentary material from multiple sources, both mature and juvenile. A mature Gondwana continental provenance dominates in sedimentary basins inboard of the active margin, especially in the Palaeozoic (Western Province, New Zealand, interior West Antarctica and NW Argentina), and contributes significantly to pre-Mesozoic sedimentary rocks of Patagonia east of the Andes. Along the Gondwanaland margin, Nd systematics for younger (late Palaeozoic to early Mesozoic) accretionary complex metasediments reflect younger source inputs, notably in the Scotia metamorphic complex. Many of the accretionary complex deposits must involve significant crustal reworking. There is no apparent South American equivalent of the primitive provenance of the westernmost accretionary terranes of New Zealand.
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  • 9
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    Pre-Cenozoic correlations across the South Atlantic region: (the ties that bind) (2008)
    In:  Geological Society Special Publication 294: 1-8.
    Details
    Publication Date: 2008-02-01
    Description: The first to recognize the complementary shapes of Africa and South America and to suggest that these continents were once joined together was Dutch scientist Ortelius in 1596. He was followed in 1620 by Elizabethan philosopher Sir Francis Bacon, who asserted that the similarity of their shapes could not be accidental. Nearly 200 years later, German naturalist von Humboldt described how the two continents may have fitted together, and in 1860 French geographer Antonio Snyder produced the first map that showed South America and Africa in close contact (e.g., Blankett 1965). By 1915 the German meteorologist Alfred Wegener had amassed enough data to publish a comprehensive scientific argument for the past conjunction of these two continents on the basis of similarities in the Palaeozoic
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  • 10
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    Late Neoproterozoic and early Cambrian palaeogeography: models and problems. Western Gondwana: Pre-Cenozoic Geology Bordering the South Atlantic (2007)
    In:  Geological Society London, Special Publication
    Details
    Publication Date: 2007
    Keywords: TF I ; Task Force I ; Earth Accretionary Systems
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    BIBLIOGRAPHY ILP
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