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Norite and magmatic sulfides

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Journal Article
Journal: Economic Geology
Published: 01 May 2012
Economic Geology (2012) 107 (3): 481–506.
...Jian-Feng Gao; Mei-Fu Zhou; Peter C. Lightfoot; Christina Yan Wang; Liang Qi Abstract The Kalatongke Cu-Ni sulfide deposit in the Paleozoic Altay orogenic belt, NW China, is hosted in a Permian mafic intrusion consisting of norite, troctolite, gabbro, and diorite. Disseminated Ni-Cu, massive Ni-Cu...
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Journal Article
Journal: Economic Geology
Published: 01 August 2015
Economic Geology (2015) 110 (5): 1295–1312.
... suite. The leuconorite lopolith transects both the dikes and the gneissic country rocks, its basal contacts with the pyroxenite-norite suite varying locally from intrusive to gradational to (magmatic) erosional. Although modified in places by secondary mobilization, disseminated Ni-Cu sulfides...
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Journal Article
Journal: Economic Geology
Published: 01 December 2001
Economic Geology (2001) 96 (8): 1855–1875.
..., the upper portion of the felsic norite unit has 5 to 10 times lower Ni and Cu than within-plate basalts and crustal rocks. There is an increase in Ni (1–5 wt %) and Cu (1–5 wt %) tenor of sulfide toward the base of the norite sequence. The depletion of the upper part of the felsic norite in Ni, Cu...
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Journal Article
Journal: Economic Geology
Published: 01 April 1999
Economic Geology (1999) 94 (2): 185–210.
...A. J. Naldrett; M. Asif; E. Scandl; T. Searcy; G. G. Morrison; W. P. Binney; C. Moore Abstract The composition of any sample of a magmatic sulfide ore depends on the composition of the silicate magma from which the sulfide segregated, the appropriate sulfide liquid-silicate magma partition...
Journal Article
Journal: Economic Geology
Published: 01 January 2004
Economic Geology (2004) 99 (1): 0173–0184.
... sulfides po > pn > cp   Actinolite UG2-1155.35 3 cm above the base of UG2 Norite Coarse-grained, disseminated chromites, po > pn > cp 1 sulfide, 1 telluride, 1 arsenide Actinolite, epidote             UG2-1155.45 Immediate footwall Anorthosite Minor sulfides...
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Journal Article
Published: 01 March 2016
South African Journal of Geology (2016) 119 (1): 243–272.
... weight %), meso-gabbronorite (14 weight %) and leuco-norite (11 weight %) have the highest, and pyroxenite the lowest (4 weight %) CaO values ( Figures 9A to G). Trace element ratios are good indicators of magmatic processes such as fractionation, magma differentiation or magma replenishment...
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Journal Article
Published: 01 April 2004
The Canadian Mineralogist (2004) 42 (2): 325–350.
.... Base-metal sulfides are associated with igneous cumulates displaying subvertical layering consisting of gabbro, norite and dolerite, with fragments of pyroxenite and peridotite. These rocks show a pervasive retrograde alteration with an early overprint of actinolite ∠chlorite ∠epidote ∠albite...
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Journal Article
Journal: Economic Geology
Published: 01 May 2014
Economic Geology (2014) 109 (3): 785–794.
..., has S/Se ratios and δ 34 S values higher than those of the magmatic sulfides and could thus be the source of the S. Furthermore, the presence of sulfides in the norites around the xenoliths suggests that the S was released from the xenolith during melting of the xenolith. Detailed sampling from...
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Journal Article
Journal: Economic Geology
Published: 01 November 2002
Economic Geology (2002) 97 (7): 1509–1519.
... 2 O/K 2 O ratios of the footwall breccia samples decrease, and Cl in both units increases with proximity to mineralization. These halos are interpreted to result from interaction of residual magmatic fluids with host rocks, which altered the host-rock mineralogy and precipitated Cl-bearing minerals...
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Journal Article
Journal: Economic Geology
Published: 01 September 2005
Economic Geology (2005) 100 (6): 1207–1227.
... and subsequent sinking of molten massive sulfides within the still ductile dike. Sinking of the massive sulfides is recorded by steeply plunging magnetic lineations. The magnetic fabrics in the cumulate norites of the embayment structure show that the norites were deposited in a dynamic environment that resulted...
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Journal Article
Journal: Economic Geology
Published: 01 March 2014
Economic Geology (2014) 109 (2): 367–386.
... greenschist facies reverse shear zones during D 2 . The mineralization is primarily composed of pyrrhotite-pentlandite-chalcopyrite-magnetite, occurring as four main types: (1) disseminated to matrix-textured sulfides in Main Mass norite and slivers of norite within shear zones, (2) semimassive breccia ore...
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Journal Article
Journal: Economic Geology
Published: 01 June 2019
Economic Geology (2019) 114 (4): 787–806.
...Bo Wei; Christina Yan Wang; Yann Lahaye; Luhua Xie; Yonghua Cao Abstract Permian-Triassic mafic-ultramafic intrusions in the Central Asian orogenic belt host a number of magmatic Ni-Cu sulfide deposits, containing a total of 3.6 million tonnes (Mt) Ni, with the Ni grades ranging from 0.4 to 2.3 wt...
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Series: Economic Geology, Economic Geology
Published: 01 January 2005
DOI: 10.5382/AV100.08
EISBN: 9781934969519
... level, Cu in the 0.1 to 10 percent range, and Co at the 0.1 to 0.3 percent level, making these elements valuable by-products of Ni production. Naldrett (2004) summarizes much of the literature on magmatic sulfides, and Arndt et al. (2005) discuss the petrogenesis of mafic-ultramafic rocks...
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Journal Article
Journal: Economic Geology
Published: 01 June 2000
Economic Geology (2000) 95 (4): 867–888.
... that is consistent with baddeleyite U-Pb ages from the magmatic system. However, data for sulfide (chalcopyrite, pyrrhotite, pentlandite) and oxide (magnetite, ilmenite) mineral separates from the Ovoid and a troctolite from the Eastern Deeps yield an isochron with an age of 1004 ± 20 Ma, consistent with Re-Os T...
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Journal Article
Journal: Economic Geology
Published: 01 June 2006
Economic Geology (2006) 101 (4): 865–881.
... by the Aguablanca intrusion, a mafic body composed of gabbronorite and minor quartz-diorite, gabbro, and norite. Sulfides are concentrated in a gabbronorite matrix along a subvertical (dip of 70°–80° N), funnel-like magmatic breccia that contains barren or slightly mineralized ultramafic-mafic cumulate fragments...
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Journal Article
Published: 01 March 2017
American Mineralogist (2017) 102 (3): 473–506.
...Stephen J. Barnes; James E. Mungall; Margaux Le Vaillant; Belinda Godel; C. Michael Lesher; David Holwell; Peter C. Lightfoot; Nadya Krivolutskaya; Bo Wei Abstract A large proportion of ores in magmatic sulfide deposits consist of mixtures of cumulus silicate minerals, sulfide liquid, and silicate...
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Journal Article
Published: 01 October 2001
Exploration and Mining Geology (2001) 10 (4): 289–301.
...ANDREW KERR Abstract The base-metal and PGE contents of samples from magmatic sulfide mineralization are commonly correlated with their sulfide contents, indicating that the metal contents of bulk sulfides remain approximately constant within a given prospect or part thereof. Calculated sulfide...
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