Journal ArticleDOI
The Rajmahal Traps of India — KAr ages and palaeomagnetism
TLDR
A number of concordant K Ar ages in the range 100 to 105 my have been measured on samples from the tholeiitic Rajmahal Traps of India.About:
This article is published in Earth and Planetary Science Letters.The article was published on 1970-11-01. It has received 90 citations till now.read more
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Flood Basalt Volcanism During the Past 250 Million Years
TL;DR: There were 11 distinct episodes of major continental flood basalt volcanism during the past 250 million years, and the initiation dates of the episodes are close to the estimated dates of mass extinctions of marine organisms.
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Hotspots in the Southern Oceans — an absolute frame of reference for motion of the Gondwana continents
TL;DR: The geometry and geochronology of aseismic ridges and oceanic islands in the southern oceans provide a good test of the proposition that hotspots remain fixed over long periods of time; that is, motion of an order of magnitude less than the relative motion between plate pairs as mentioned in this paper.
Journal ArticleDOI
40Ar/39Ar age spectra of some undisturbed terrestrial samples☆
TL;DR: In this paper, the authors used incremental heating for 11 terrestrial rocks and minerals whose geology indicates that they represent essentially undisturbed systems, including muscovite, biotite, hornblende, sanidine, plagioclase, dacite, diabase and basalt.
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Continental drift, paleoclimatology, and the evolution and biogeography of birds
TL;DR: It is concluded that a number of avian orders and families had their origin in Gondwanaland and predrift configurations of the continents were major determinants of their biogeography.
Journal ArticleDOI
Kerguelen hotspot source for Rajmahal Traps and Ninetyeast Ridge
TL;DR: The hypothesis that hotspots are the sources of many continental flood basalts is evaluated geochemically for the proposed Rajmahal Traps-Ninetyeast Ridge-Kerguelen hotspot system as mentioned in this paper.
References
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Potassium-argon dates of basaltic rocks from Southern Brazil
TL;DR: For example, in this paper, the authors reported that the principal Brazilian volcanism was mid-Lower Cretaceous and not Jurassic as earlier supposed, and there is a real tail of higher ages which shows that there was precursory volcanic activity 147 m.y.
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Excess radiogenic argon in young subaerial basalts from the Auckland volcanic field, New Zealand
TL;DR: In the case of the Rangitoto volcanic island, the radiocarbon, geological and botanical evidence unequivocally showed that it was active and was probably built during the last 1000 years as discussed by the authors.