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String Cloud and Domain Walls with Quark Matter in Lyra Geometry

Journal of Modern Physics 2012年第10期3卷 1479-1486页

作者： kamal lochan mahanta Ashwini Kumar Biswal Department of Mathematics C. V. Raman College of Engineering Bhubaneswar India

We have constructed cosmological models for string cloud and domain walls coupled with quark matter in Lyra geometry. For this purpose we have solved the field equations using anisotropy feature of the universe, special law of variation for Hubble’s parameter proposed by Berman [78] which yields constant deceleration parameter;and time varying displacement field . Further some properties of the obtained solutions are discussed.

关键词： Cosmic Strings Domain Walls Quark Matter Lyra Geometry

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Nature and source of the ore-forming fluids associated with orogenic gold deposits in the Dharwar Craton

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Geoscience Frontiers 2018年第3期9卷 715-726页

作者： Biswajit Mishra kamal lochan Pruseth Pranjit Hazarika Sakthi Saravanan Chinnasamy Department of Geology and Geophysics Indian Institute of TechnologyKharagpur 721302India Department of Geological Sciences Gauhati UniversityGuwahati 781014India Department of Earth and Atmospheric Sciences National Institute of TechnologyRourkela 769008India

Neoarchean orogenic gold deposits, associated with the greenstone-granite milieus in the Dharwar Craton include(1) the famous Kolar mine and the world class Hutti deposit;(2) small mines at HiraBuddini, Uti, Ajjanahalli, and Guddadarangavanahalli;(3) prospects at Jonnagiri; and(4) old mining camps in the Gadag and Ramagiri-Penakacherla belts. The existing diametric views on the source of ore fluid for formation of these deposits include fluids exsolved from granitic melts and extracted by metamorphic devolatilization of the greenstone sequences. Lode gold mineralization occurs in structurally controlled higher order splays in variety of host rocks such as mafic/felsic greenstones, banded iron formations, volcaniclastic rocks and granitoids. Estimated metamorphic conditions of the greenstones vary from lower greenschist facies to mid-amphibolite facies and mineralizations in all the camps are associated with distinct hydrothermal alterations. Fluid inclusion microthermometric and Raman spectroscopic studies document low salinity aqueous-gaseous(H_2O + CO_2 ± CH_4 + NaCl) ore fluids,which precipitated gold and altered the host rocks in a narrow P-T window of 0.7-2.5 kbar and 215-320℃. While the calculated fluid O-and C-isotopic values are ambiguous, S-isotopic compositions of pyrite-precipitating fluid show distinct craton-scale uniformity in terms of its reduced nature and a suggested crustal sulfur *** ages on greenstone metamorphism, granitoid plutonism and mineralization in the Hutti Belt are tantamount, making a geochronology-based resolution of the existing debate on the metamorphic *** fluid source impossible. In contrast, tourmaline geochemistry suggests involvement of single fluid in formation of gold mineralization, primarily derived by metamorphic devolatilization of mafic greenstones and interlayered sedimentary rocks, with minor magmatic contributions. Similarly, compositions of scheelite, pyrite and arsenopyrite point toward operatio

关键词： Dharwar Gold Fluid inclusions Isotopes Fluid composition Greenstone metamorphism

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