Results 11 to 20 of about 30,387 (283)
Supergiant porphyry copper deposits are failed large eruptions
Communications Earth & Environment, 2022 Porphyry copper deposits, the principal source of copper and molybdenum, form at convergent margins. Copper is precipitated from fluids associated with cooling magmas that have formed in the mantle and evolved at mid- to lower crustal levels, before ...
M. Chiaradia, L. Caricchi
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Zircon Hf isotope of Iranian porphyry copper deposits: Constraints on the source of porphyry Cu magma [PDF]
پترولوژی, 2016 In this research, zircon Hf isotopic ratios from Sungun, Sar Cheshmeh, Meiduk, Darreh Zar and Bondar Hoza porphyry mineralized intrusions has been studied.
Mehraj Aghazadeh
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Recycled volatiles determine fertility of porphyry deposits in collisional settings
American Mineralogist, 2021 An intensive study of the geochemical characteristics (including the volatile elements Cl and S) of apatite associated with porphyry deposits was undertaken to address the debate about the crust- or mantle-derivation of their copper and gold and to ...
Bo Xu +6 more
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Report on laboratory tests of sandstone and porphyry for rock fracture analysis
Budownictwo i Architektura, 2020 The paper presents the results of mechanical tests of three types of rocks from stone mines in Poland. Compression tests of cubic samples, three-point bending tests of beams, bending of beams with notch and testing of tensile strength using the quasi ...
Jakub Gontarz, Jacek Szulej
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Journal of Economic Geology, 2022 Introduction Iran hosts numerous porphyry and epithermal ore deposits which have mostly been formed at discrete time periods within different tectonic assemblages.
Alireza Zarasvandi +4 more
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Mineralium Deposita, 2022 A current mineral exploration focus is the development of tools to identify magmatic districts predisposed to host porphyry copper deposits. In this paper, we train and test four, common, supervised machine learning algorithms: logistic regression ...
Chetan L. Nathwani +5 more
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Porphyry copper deposit formation in arcs: What are the odds?
Geosphere, 2021 Arc magmas globally are H2O-Cl-S–rich and moderately oxidized (ΔFMQ = +1 to +2) relative to most other mantle-derived magmas (ΔFMQ ≤ 0). Their relatively high oxidation state limits the extent to which sulfide phases separate from the magma, which would ...
J. Richards, M. Leybourne
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Geology, 2022 For porphyry Cu deposits that formed during oceanic slab subduction, there is a general consensus that the ore-forming magmas evolved through fractionation of mafic magmas that were generated by slab fluid (±melt)–fluxed melting of the asthenospheric ...
Jia Chang, A. Audétat
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Necessity in Philosophical Thinking as Exemplified by Porphyry’s Sentences [PDF]
Studia Gilsoniana, 2023 The text presented aims to illustrate the thesis of E. Gilson derived from his work “The Unity of Philosophical Experience” on the impersonal necessity linking philosophical ideas, as exemplified by Porphyry and his work Sententiae ad intelligibilia ...
Monika Komsta
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A Comparison between the Pagan and Christian Apologies for Holy Images [PDF]
حکمت و فلسفه, 2021 This paper is going to draw a comparison between pagan and Christian apologies for holy images. To this end, after giving a general history of the issue, the most important criticisms made of the images and veneration of them will be briefly considered ...
Alireza Esmaeilzadeh Barzi
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