Paleomagnetic study of 1765 Ma dyke swarm from the Singhbhum Craton: Implications to the paleogeography of India
TL;DR: In this article, the authors reported the first key paleopole as a result of paleomagnetic study on a precisely dated 1765, which was used in this study to propose the paleogeographic reconstruction of India with Baltica Craton and North China Craton.
About: This article is published in Journal of Asian Earth Sciences.The article was published on 2017-08-26. It has received 35 citations till now. The article focuses on the topics: Craton & Baltica.
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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 paper, the authors conducted new paleomagnetic analyses for mafic dykes of the 1790-Ma Para de Minas swarm, occurring in the southern Sao Francisco Craton.
30 citations
TL;DR: In this paper, the authors reported ten precise Pb-Pb TE-TIMS age determinations on baddeleyite grains separated from seven mafic dykes and three sills in the Eastern Dharwar craton.
Abstract: The Dharwar Craton in Peninsular India was intruded by a series of mafic dykes during the Paleoproterozoic and these mafic magmatic events have important implications on continental rifting and LIPs. Here we report ten precise Pb–Pb TE-TIMS age determinations on baddeleyite grains separated from seven mafic dykes and three sills, intruding into Archean basement rocks and Proterozoic sedimentary formations of the Eastern Dharwar Craton respectively. The crystallization age of the baddeleyite shows 2366.3 ± 1.1 Ma, and 2369.2 ± 0.8 Ma for the NE–SW trending dykes, 2368.1 ± 0.6 Ma, 2366.4 ± 0.8 Ma, 2207.2 ± 0.7 Ma and 1887.3 ± 1.0 Ma for the ENE–WNW to E–W striking dykes, 1880.6 ± 1.0 Ma, 1864.3 ± 0.6 Ma and 1863.6 ± 0.9 Ma for Cuddapah sills, and 1861.8 ± 1.4 Ma for the N–S trending dyke. Our results in conjunction with those from previous studies identify eight distinct stages of widespread Paleoproterozoic magmatism in the Dharwar craton. The mantle plume centres of the four radiating dyke swarms with ages of ~2367 Ma, ~2210 Ma, ~2082 Ma, and ~1886 Ma were traced to establish their proximity to the EDC kimberlite province. Though the ~2367 Ma and ~1886 Ma plume centres are inferred to be located to the west and east of the present day Dharwar craton respectively away from the kimberlite province, location of plume heads of the other two swarms with ages of ~2207 Ma and ~2082 Ma are in close proximity. In spite of the ubiquitous occurrence of dyke intrusions of all the seven generations in the kimberlite province, only few of these kimberlites are diamondiferous. Kimberlite occurrences elsewhere in the vicinity of older Large Igneous Provinces (LIPs) like the Mackenzie, Karoo, Parana-Etendeka and Yakutsk-Vilui are also non-diamondiferous. This has been attributed to the destruction of the lithospheric mantle keel (that hosts the diamonds) by the respective mantle plumes. The diamondiferous nature of the EDC kimberlites therefore suggests that plume activity does not always result in the destruction of the mantle keel.
18 citations
TL;DR: In this paper, the authors presented a new and complete Bouguer gravity map of the Singhbhum craton with insights into its deep crust-mantle structure, lithospheric thickness and density variations.
16 citations
TL;DR: The Singhbhum Craton in eastern India is host to at least seven sets of mafic dyke swarms and the dykes range in composition from basalt to andesite and have transitional tholeiitic to calc-alkaline affinities as discussed by the authors.
14 citations
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TL;DR: In this paper, principal component analysis is used to find and estimate the directions of lines and planes of best least squares fit along the demagnetization path of a palaeomagnetic specimen.
Abstract: Summary
The classic, multivariate technique of principal component analysis can be used to find and estimate the directions of lines and planes of best least-squares fit along the demagnetization path of a palaeomagnetic specimen, thereby replacing vector subtraction, remagnetization circles and difference vector paths with one procedure. Eigenvalues from the analysis are the variance of the data along each principal axis, and provide a relative measure of collinearity or coplanarity which may be used to define a general palaeomagnetic precision index. Demagnetization planes found with principal component analysis may be used in place of difference vector paths for locating Hoffman—Day directions, avoiding unnecessary vector subtraction and intensity truncation steps. Two methods are discussed for jointly estimating an average remanence direction from demagnetization lines and planes.
4,993 citations
TL;DR: The pre-Rodinia supercontinent was assembled along global-scale 2.1-1.8 Ga collisional orogens and contained almost all of Earth's continental blocks as mentioned in this paper.
1,109 citations
TL;DR: The existence of a pre-Rodinia Precambrian supercontinent, variously called Nuna or Columbia, has been widely speculated in the past decade, but the precise timing of its existence and its configuration have been uncertain due to the lack of unequivocal paleomagnetic and geological constraints as mentioned in this paper.
435 citations
TL;DR: A set of global paleogeographic reconstructions for the 1770-1270 Ma time interval is presented in this article through a compilation of reliable paleomagnetic data and geological constraints.
381 citations