Evidence for a Neoarchean LIP in the Singhbhum craton, eastern India: Implications to Vaalbara supercontinent
TL;DR: In this article, the authors reported eight new Pb-Pb baddeleyite ages and paleomagnetic results on a series of hitherto unknown NNE-SSW trending mafic dyke swarms intruding the Paleoarchean basement rocks in the Singhbhum craton, eastern India.
About: This article is published in Precambrian Research.The article was published on 2017-05-01. It has received 89 citations till now. The article focuses on the topics: Craton & Paleoarchean.
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TL;DR: In this article, the authors presented whole-rock and mineral chemical data coupled with zircon U-Pb dating and Hf isotope results on granitoids from the central part of the Singhbhum craton to understand their petrogenesis, tectonic setting and role in continental crustal evolution.
103 citations
01 May 2001
TL;DR: Mapping and geochronology of an impact-generated section through the Mesoarchean crust of the Kaapvaal craton indicates tectosphere birth at 3.08 +/- 0.01 billion years ago, roughly 0.12 billion years after crust assembly.
Abstract: The crustal remnants of Earth's Archean continents have been shielded from mantle convection by thick roots of ancient mantle lithosphere. The precise time of crust-root coupling (tectosphere birth) is poorly known but is needed to test competing theories of continental plate genesis. Our mapping and geochronology of an impact-generated section through the Mesoarchean crust of the Kaapvaal craton indicates tectosphere birth at 3.08 +/- 0.01 billion years ago, roughly 0.12 billion years after crust assembly. Growth of the southern African mantle root by subduction processes occurred within about 0.2 billion years. The assembly of crust before mantle may be common to the tectosphere.
102 citations
TL;DR: The Van der Voo (1990) criteria have been updated and modernized in this paper to reflect advances in paleomagnetism and geochronology with a faithful adherence to the simplicity of the original publication.
88 citations
TL;DR: In this article, the authors report new zircon U-Pb and Hf isotopic data from key stratigraphic intervals in the Archean nucleus and the North Singhbhum Mobile Belt.
87 citations
TL;DR: In this article, the authors improved the LIP record of the Dharwar craton by U-Pb geochronology of 18 dykes, which together comprise seven generations of Paleoproterozoic dyke swarms with emplacement ages within the 2.37-1.79 Ga age interval.
71 citations
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01 Jan 2003
8,183 citations
TL;DR: In this article, the authors developed a form of theory which appears to be appropriate to measurements of position on a sphere and demonstrated the simultaneous distribution of the amplitude and direction of the vector sum of a number of random unit vectors of given precision.
Abstract: Any topological framework requires the development of a theory of errors of characteristic and appropriate mathematical form. The paper develops a form of theory which appears to be appropriate to measurements of position on a sphere. The primary problems of estimation as applied to the true direction, and the precision of observations, are discussed in the subcases which arise. The simultaneous distribution of the amplitude and direction of the vector sum of a number of random unit vectors of given precision, is demonstrated. From this is derived the test of significance appropriate to a worker whose knowledge of precision lies entirely in the internal evidence of the sample. This is the analogue of ‘Student’s’ test in the Gaussian theory of errors. The general formulae obtained are illustrated using measurements of the direction of remanent magnetization in the directly and inversely magnetized lava flows obtained in Iceland by Mr J. Hospers.
5,482 citations
TL;DR: In this paper, it is suggested that positive reversal tests should be classified according to the amount of information that was available for the test, which is readily indicated by the critical angle (e.g., at the 95 per cent confidence level) between the two sample mean directions at which the hypothesis of common mean direction for the distributions would be rejected.
Abstract: SUMMARY It is standard practice that a positive reversal test is claimed on the basis of inability to reject the hypothesis that two distributions share a common mean direction, and thus the claim of a positive reversal test is in fact often based on a lack of information. This is unsatisfactory. Therefore it is suggested that positive reversal tests should be classified according to the amount of information that was available for the test. This amount of information is readily indicated by the critical angle (e.g., at the 95 per cent confidence level) between the two sample mean directions at which the hypothesis of common mean direction for the distributions would be rejected. It is recommended that 5", 10" and 20" be used as the breakpoints in the classification.
1,283 citations
TL;DR: In this paper, it was shown that a craton with three to four rifted margins has a ca. 10% maximum probability of correlating with any of the ca. 35 remaining Archean cratons around the globe.
645 citations
TL;DR: The Superior Province consists of northern and southern high-grade gneiss subprovinces and a central region of alternating granite-greenstone and metasedimentary belts as mentioned in this paper.
520 citations