Fe-rich Dunite Xenoliths from South African Kimberlites: Cumulates from Karoo Flood Basalts
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چکیده
منابع مشابه
Columbia River flood basalts from a centralized crustal magmatic system
The Columbia River Basalt Group in the northwestern United States, comprising about 230,000 cubic kilometres of rock, exhibits unusual patterns in lava distribution, geochemistry and its apparent relationship to regional tectonics. Consequently, there is little consensus on the origin of its magmas. Here, we examine the isotopic ratios of Sr, Nd, Pb and Os and traceelement abundances in Columbi...
متن کاملUnderstanding cratonic flood basalts
The origin of continental flood basalts has been debated for decades. These eruptions often produce millions of cubic kilometers of basalt on timescales of only a million years. Although flood basalts are found in a variety of settings, no locale is more puzzling than cratonic areas such as southern Africa or the Siberian craton, where strong, thick lithosphere is breached by these large basalt...
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The Middle Permian Tapinocephalus Assemblage Zone in South Africa has produced a rich record of tetrapods domi− nated by dinocephalian therapsids and pareiasaurid para− reptiles. In this study we reassess the affinities of a specimen from this horizon previously identified as a procolophonoid and provide evidence that it is instead referable to a nyctero− leter parareptile, an identification th...
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techniques and fractionation correcting to a 194Pt/ 95pt ratio of 0.9734 (38). 33. E. Anders and N. Grevesse, Geochim. Cosmochim. Acta 53, 197(1989). 34. M. P. Gorton, E. S. Schandl, A. J. Naldrett, Ocean Drilling Project Scientific Results, Leg 140, in press. 35. R. J. Walker et al., Geochim. Cosmochim. Acta 58, 4179 (1994); M. F. Horan, R. J. Walker, V. A. Fedorenko, G. K. Czamanske, ibid., i...
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Introduction: We consider the probability that a sample mission to a site within the South Pole-Aitken Basin (SPA) would return basaltic material. A sample mission to the SPA would be the first opportunity to sample basalts from the far side of the Moon. The near side basalts are more abundant in terms of volume and area than their far-side counterparts (16:1 [1]), and the basalt deposits withi...
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ژورنال
عنوان ژورنال: Journal of Petrology
سال: 2007
ISSN: 0022-3530,1460-2415
DOI: 10.1093/petrology/egm023