Petrological and geochemical investigation of rocks from the Davie fracture zone (Mozambique Channel) and some tectonic implications

Bassias, Y.

doi:10.1016/0899-5362(92)90018-8

Cited by 41 publications

(35 citation statements)

References 31 publications

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“…Therefore, we consider that the continental origins of Madagascar and the granitic Seychelles, and their isolation from other land masses, considerably predate the arrival of sunbirds in the Indian Ocean. Likewise, while seamounts in the Mozambique channel between Africa and Madagascar may have aided the arrival of some Madagascar endemics, including certain groups of birds (Fjeldsa a et al, 1999), they are unlikely to have been important to Indian Ocean sunbird colonization owing to their relatively old dates, approximately 45-26 Ma (Bassias, 1992;Leclaire et al, 1989;McCall, 1997).…”

Section: Geological Background For the Islands Of The Western Indian mentioning

confidence: 99%

Molecular phylogeography reveals island colonization history and diversification of western Indian Ocean sunbirds (Nectarinia: Nectariniidae)

Warren

Bermingham

Bowie

et al. 2003

Molecular Phylogenetics and Evolution

105

104

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Section: Geological Background For the Islands Of The Western Indian mentioning

confidence: 99%

Molecular phylogeography reveals island colonization history and diversification of western Indian Ocean sunbirds (Nectarinia: Nectariniidae)

Warren

Bermingham

Bowie

et al. 2003

Molecular Phylogenetics and Evolution

105

104

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“…45-26 million years ago. Core samples reported by Leclaire et al [1989] and Bassias [1992] suggest a chain of topographic highs formed along the ancient DFZ fault line at this time, resulting in the deposition of subaerial sediments. With the activation of the east African rifting system tensional conditions were subsequently re-established, and the resulting subsidence returned the elevated areas to the seafloor.…”

Section: Foliamentioning

confidence: 99%

Historical Biogeography of the Strepsirhine Primates of Madagascar

Tattersall¹

2006

IJFP

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Lying some 400 km off the coast of southeastern Africa, Madagascar is the world’s largest oceanic island. It has been in roughly the same position relative to its parent continent for 120 million years, and as a consequence its mammal fauna is unusual in composition, with a low number of major taxa but a high diversity at lower taxonomic levels. Among Madagascar’s native terrestrial mammals, only the orders Primates, Rodentia, Carnivora and Insectivora are represented (plus, until recently, the enigmatic and endemic Bibymalagasia, and Artiodactyla in the form of semiaquatic pygmy hippopotamuses). This reflects the fact that terrestrial mammals are notoriously poor over-water dispersers; yet at the same time the ancestors of all of Madagascar’s mammals had to have crossed a wide oceanic barrier to get to the island at various points during the Tertiary. Here I examine the palaeogeographic evidence for potential land bridge or ‘stepping-stone’ connections with adjacent continents from the Mesozoic through the Cenozoic, and review the fossil records and phylogenies of each of Madagascar’s mammalian groups in an attempt to estimate the minimum number of crossings necessary to produce the island’s current faunal composition. Probable monophyletic origins for each major group, and thus a smaller rather than a larger number of crossings of the Mozambique Channel, imply that this water barrier has acted as a powerful filter; so powerful that it is unclear whether any crossings would have been possible without some form of subaerial connection, however ephemeral, at least from time to time during the Tertiary. Clarification of how Madagascar’s terrestrial mammal fauna may have originated is thus as likely to emerge from the geology of the seafloor surrounding the island as it is to come from the fossil record or from the internal and external relationships of its various components.

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“…Core samples taken from the DFZ identify a metamorphosed continental basement, which is unconformably overlain by limestones, basalts and carbonate oozes, suggesting a marine sedimentary environment from about 26 Ma (lower Miocene). These cores indicate that prior to this, from approximately 45 Ma (mid-Eocene) to 26 Ma (lower Miocene), areas of the Mozambique Channel were above sea level and subject to erosion (Leclaire et al 1989 ;Bassias 1992). The total area of land exposed at this time is difficult to estimate as core samples have been concentrated on the DFZ.…”

mentioning

confidence: 99%

“…The separation of India and Madagascar approximately 83 Ma (Segoufin & Patriat 1981) resulted in basaltic eruptions along the crustal weakness of the DFZ (Bassias 1992). At this stage, in this tensional setting, the Mozambique Channel was probably marine, as evidenced by the presence of altered carbonate deposits from the upper Cretaceous in some sediment cores from the DFZ (Mougenot et al 1986 ;Bassias 1992). Approximately 42 Ma, India collided with Asia.…”

mentioning

confidence: 99%

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Implications of recent geological investigations of the Mozambique Channel for the mammalian colonization of Madagascar

McCall¹

1997

Proc. R. Soc. Lond. B

108

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Madagascar separated from continental Africa during the break-up of Gondwanaland early in the Cretaceous. The presence of several terrestrial mammalian groups on Madagascar is paradoxical as (i) these groups postdate the departure of Madagascar from Africa ; and (ii) terrestrial mammals are poor dispersers across wide water barriers. Recent geological studies focusing on the Davie Fracture Zone of the Mozambique Channel offer a resolution to this situation, by suggesting the presence of a land-bridge from the mid-Eocene to the early Miocene, an interval that matches the ages of Madagascar's mammalian groups.

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Petrological and geochemical investigation of rocks from the Davie fracture zone (Mozambique Channel) and some tectonic implications

Cited by 41 publications

References 31 publications

Molecular phylogeography reveals island colonization history and diversification of western Indian Ocean sunbirds (Nectarinia: Nectariniidae)

Molecular phylogeography reveals island colonization history and diversification of western Indian Ocean sunbirds (Nectarinia: Nectariniidae)

Historical Biogeography of the Strepsirhine Primates of Madagascar

Implications of recent geological investigations of the Mozambique Channel for the mammalian colonization of Madagascar

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