Topic
Gondwana
About: Gondwana is a research topic. Over the lifetime, 6078 publications have been published within this topic receiving 263050 citations. The topic is also known as: Gondwanaland.
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TL;DR: In this paper, the authors re-examine the early tectonic environment of the initial Kerguelen plume head, and demonstrate the need for the presence of the Keraplume early during continental rifting, which may have resulted in stranded fragments of continental crust, isolated at shallow levels in the Indian Ocean lithosphere.
102 citations
TL;DR: In this article, the authors presented evidence for the timing of three distinct phases of orogenic development, as determined from East Timor, including initial collision and emplacement of the early nappes creating loading and diapirism (within the 98-55-Ma interval), a tectonic quiet interval (55−Ma-45-Ma) that extended for about a million years during the middle of the collision and may represent the time of locking of the subduction system, and a post 45-Ma phase of uplift, unroofing and
102 citations
TL;DR: In this paper, the authors present a statistical approach to data mining and quantitatively evaluating detrital age spectra for sedimentary provenance analyses and palaeogeographic reconstructions.
Abstract: We present a statistical approach to data mining and quantitatively evaluating detrital age spectra for sedimentary provenance analyses and palaeogeographic reconstructions. Multidimensional scaling coupled with density-based clustering allows the objective identification of provenance end-member populations and sedimentary mixing processes for a composite crust. We compiled 58 601 detrital zircon U–Pb ages from 770 Precambrian to Lower Palaeozoic shelf sedimentary rocks from 160 publications and applied statistical provenance analysis for the Peri-Gondwanan crust north of Africa and the adjacent areas. We have filtered the dataset to reduce the age spectra to the provenance signal, and compared the signal with age patterns of potential source regions. In terms of provenance, our results reveal three distinct areas, namely the Avalonian, West African and East African–Arabian zircon provinces. Except for the Rheic Ocean separating the Avalonian Zircon Province from Gondwana, the statistical analysis provides no evidence for the existence of additional oceanic lithosphere. This implies a vast and contiguous Peri-Gondwanan shelf south of the Rheic Ocean that is supplied by two contrasting super-fan systems, reflected in the zircon provinces of West Africa and East Africa–Arabia.
102 citations
TL;DR: The distribution of Mesozoic marine reptile clades exhibit a cosmopolitan, or at least pandemic, distribution very early in their evolutionary history, and the acquisition of morphological adaptations to a fully aquatic life, combined to special thermophysiological characteristics, are probably responsible for these animals to become efficient long-distance open-marine cruisers as mentioned in this paper.
102 citations
01 Jan 2005
TL;DR: MORB appears to be consistent with the hypothesis that this component represents fragments of subduction-modified lithospheric mantle beneath Proterozoic orogenic belts that foundered into the nascent Indian Ocean upper mantle during the Mesozoic breakup of Gondwana as discussed by the authors.
Abstract: MORB appear to be most consistent with the hypothesis that this component represents fragments of subduction-modified lithospheric mantle beneath Proterozoic orogenic belts that foundered into the nascent Indian Ocean upper mantle during the Mesozoic breakup of Gondwana.
102 citations