Mineralogical and chemical characteristics of newer dolerite dyke around Keonjhar, Orissa: Implication for hydrothermal activity in subduction zone setting
TLDR
The newer dolerite dykes around Keonjhar within the Singbhum Granite occur in NE-SW, NW-SE and NNE-SSW trends as mentioned in this paper.Abstract:
The newer dolerite dykes around Keonjhar within the Singbhum Granite occur in NE–SW, NW–SE and NNE–SSW trends. The mafic dykes of the present study exhibit several mineralogical changes like clouding of plagioclase feldspars, bastitisation of orthopyroxene, and development of fibrous amphibole (tremolite–actinolite) from clinopyroxene, which are all considered products of hydrothermal alterations. This alteration involves addition and subtraction of certain elements. Graphical analyses with Alteration index and elemental abundances show that elements like Rb, Ba, Th, La and K have been added during the alteration process, whereas elements like Sc, Cr, Co, Ni, Si, Al, Fe, Mg and Ca have been removed. It is observed that in spite of such chemical alteration, correlation between major and trace elements, characteristic of petrogenetic process, is still preserved. This might reflect systematic Alteration (addition or subtraction) of elements without disturbing the original element to element correlation. It has also been established by earlier workers that the evolution of newer dolerite had occurred in an arc-back arc setting which may also be true for newer dolerites of the present study. This is evident from plots of pyroxene composition and whole rock composition of newer dolerite samples in different tectonic discrimination diagrams using immobile elements. The newer dolerite dykes of the Keonjhar area may thus be considered to represent an example of hydrothermal activity on mafic rocks in an arc setting.read more
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TEM and FESEM characterization of asbestiform and non-asbestiform actinolite fibers in hydrothermally altered dolerites (France)
TL;DR: In this paper, the authors provided new mineralogical and morphological characterizations of calcic amphiboles from hydrothermally altered dolerites from France to discuss their potential to contain naturally occurring asbestos (NOA) and to release elongated mineral particles corresponding to asbestos fibers, or asbestos-like fibers, into the air.
Journal ArticleDOI
Paleomagnetic results from the Singhbhum Craton, India: Remagnetization, demagnetization, and complication
Anthony F. Pivarunas,Joseph G. Meert,Karastin Daun Katusin,Manoj K. Pandit,Scott R. Miller,Aubrey Craver,Kelli M. Roderus,Anup K. Sinha +7 more
TL;DR: In this paper, the authors report a complicated magnetic fidelity through time in Singhbhum craton, India, with new, geographically wide-spread and spatially detailed, paleomagnetic results.
Journal ArticleDOI
Reappraisal of the ‘early proterozoic gabbro-anorthosite suite’ rocks from the eastern Singhbhum craton, India: Insights from field features, petrography–mineralogy and geochemistry
TL;DR: In this paper, the authors focused on six mafic-ultramafic units from eastern Indian Singhbhum craton: (i) gabbroic rocks of Galudih, (ii) dolerite from North of Bisoi, (iii) Bangriposi wehrlite ( BW), (iv) dolerance from North-of-Kuliana, (v) Kuliana-layered Gabbro (KLG), and (vi) ditherite of Jashipur.
Journal ArticleDOI
Secular evolution of the subcontinental lithospheric mantle beneath Indian cratons: Insights from geochemistry and geochronology of the Precambrian mafic dykes
Om Prakash Pandey,Debajyoti Paul +1 more
TL;DR: In this article , the authors reviewed the existing geochronological and geochemical data of various Precambrian mafic dyke swarms intruding in all Indian cratons, to track temporal changes in composition of the underlying subcontinental lithospheric mantle (SCLM).
Book ChapterDOI
Proterozoic Newer Dolerite Dyke Swarm Magmatism in the Singhbhum Craton, Eastern India
TL;DR: In this article , the authors focused on the published results or conclusions of these dykes in terms of their mantle source characteristics, metasomatism of the mantle source, degree of crustal contamination and partial melting processes.
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