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Hypogene and Supergene Gobalt-Gopper Sllfides, Carrizal

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Hypogene and Supergene Gobalt-Gopper Sllfides, Carrizal American Mineralogist, Volume 59, pages 302-306, 1974 Hypogeneand SupergeneGobalt-Gopper SLlfides, CarrizalAlto, Atacama,Chile AreN H. Crlnrc Departmentof GeologicalSciences, Queen's Uniuersity, Kingston, Ontario, Canada Abstract The supergene replacement of an intermediate member of the linnaeite-carrollite series by djurleite in the Carrizal Alto deposits has resulted in the development of microscopic inter- mediate zones consisting of essentially stoichiometric carrollite (Co,cuS+) and lesser amounts of a cobalt sulfide mineral. The latter, with the approximate composition CoonuS, exhibits physical properties and an X-ray powder pattern corresponding to synthetic F Cor-"S. It clearly formed at normal temperatures, despite the experimental evidence for the instability of the B-phasebelow ca 460"C. Introduction oxidation, sensu stricto, are observedin the hand- but heterogenite and Microscopicexamination of a hand-specimenfrom specimen under discussion, (cf Clark, the dumps of the now-abandoned,but once highly cuprian heterogeniteof oxidation origin productive, Canizal Alto copper camp, Atacama 1970) havebeen confirmed as thin coatingson sev- Province,northern Chile (Lat. 28" 5.5'S; Long. 70' eral other ore specimensfrom the Carrizal Alto 55'W; Ruiz, 1965,pp.2tl-214), hasrevealed the dumps. occurrenceof an unusual associationof sulfide min- HyPogeneAssemblage erals whose compositionsessentially conform to the systemCo-Cu-S. The effectsof supergenealteration The hypogenevein material is almost monomin- of a cobalt-copper sulfide are well shown in this eralic, consistingof a sulfide of the linnaeite series specimen,which containsa phasesimilar or identical associated with very minor amounts of pyrite, to synthetic hexagonal (F) Cot ,S, perhaps cor- chalcopyrite,and bornite. The dominant constitnent respondingto the poorly-definedand generally dis- forms coarseintergrowths of blocky, subhedralgrains credited mineral, jaipurite (uiz, Palache, Berman, exhibiting an irregular, rectangularcleavage. Grains and Frondel,1944) . not in immediate contact with djurleite contain no The cobalt-rich minerals were emplaced as nar- oriented incluslons which could be consideredsug- row (1-12 mm) veins in altered dioritic country gestive of exsolution, and the sparseinclusions of rock, and are now preservedlargely as fragmentsin bornite and pyrite have irregular, bleb-like forms. late-stage calcite-ankerite vein material. The ore The linnaeite-typephase is completely isotropic, mineral assemblageis remarkably poor in iron and and exhibits a slightly pinkish-white color in plane- nickel, and is quite distinct from the pyrrhotite- polarized reflected light in air and oil; it takes an pyrite-chalcopyrite-arsenopyriteassociation which excellentpolish. Its Vickers micro-indentationhard- constituted much of the ore worked at this camp. ness,determined for 15 grains with a Leitz Duri- Its preciseprovenance in the mine is unknown. ment instrumentand a 100p load, shows(Table 1) Grains of the hypogeneore minerals are locally a restrictedrange from 390 to 425 (avenge, 405). cross-cut and mantled by "massive chalcocite," The reflectancesof six grains at the four standard which formed during an episodeof supergenesulfide wavelengths(Table 1) were determinedin air with enrichmentante-dating the local develoirmentof the a Vickers-Bnr digital microphotometer,equipped AtacamaPediplain in the Upper Miocene (Sillitoe, with a continuous-bandinterference filter and a Mortimer,and Clark, 1968;Clark et al,1967), and photomultiplier detector, and using the calibrated consistsentirely of djurleite. No effectsof supergene Carl Zeisssilicon carbide and tungstencarbide stan- 302 COBALT.COPPER SULFIDES, ATACAMA, CHILE 303 dards issued by the I.M.A. Commissionon Ore Tlsre l. Physical Properties of Carrollites A and B and Microscopy. No bireflectancewas 6Co'-"S 'weredetected and only minor reflectance difterences found between Refleclance (:) the grains {in air) examined(Table 1). 47om 546m 589m 65om The foregoing physical properties are in general 4l.l- 43.2- 43.9- 45.3- 390- 40S (100p) agreementwith those reported for linnaeite-group 4r.5 43.3 44 5 45.7 425 carrollile B 40.1- 4r.5- 42.7- 43.2- 3?3 385 (100p) minerals,although quantitative values for reflectance 4r.o 42.O 43,2 43.7 387 and 34.8 36.0 34.0 30.8 hardnessdo not appear to have been recorded 218 (lop) for analyzedintermediate members of the linnaeite- 42.4 40.7 39.2 36.1 245 carrollite series.The reflectancedispersion curve of the Carrizal Alto mineral lies at lower valuesbut is determinationsof the cell parametersof analyzed similar in form to thosefound for siegeniteby Petruk, intermediatemembers of the linnaeite-carrollitesub- Harris, and Stewart (1969) and for polydymite by seriesappear to have been reported, but the deter- E. A. J. Burke (Uytenbogaardtand Burke, 1,969.\. mined parameter is significantly greater than that Previous records of the micro-indentationhardness reported for syntheticCozCuSr by Bouchard, Russo, of linnaeite-type minerals (Uytenbogaardt and andWald ( 1965;see below). Burke, 1969) show wide variationsfor each sub- For the purposeof discussion,this hypogenephase species,perhaps as a result of compositionalvaria- will hereinafterbe referred to as A", tions in the specimensexamined. "carrollite al- though it may be more preciselycharacterized as a Electron microprobe analysisconfirms the identity cobaltiancarrollite. of this mineral as a memberof the linnaeite-carrollite solid solutionseries, as definedby Tarr (1935) and Supergene Assemblage by Vokes (1967). Using as standardssyntheric The minor sup€rgene djurleite (confirmed by chalcocite (Cua6eS), covellite (Cul.nsS), metallic X-ray powder study) in the hand-specimenunder cobalt, and a natural cobaltianpentlandite (composi- discussiondeveloped largely through replacementof tion Co6.2Ni1.2Fe1.eSs)from Outokumpu,Finland, a carrollite A. Where grains of the hypogenesulfide composition of Co6.7eCuo.22S1.2,or (Co,Cu)353.62 are surroundedby djurleite, the mutual contactsare was determined(Table 2); only tracesof nickel and highly irregular and, in severalareas, these minerals iron are present.No variationsin Co:Cu ratio could are separatedby an intermediatephase. The latter be detected within individual grains or between is optically similar to the original carrollite, being grains. No indication of the presenceof a second isotropic and pinkish-whitein color, but is detectably phase intergrown with the thiospinel was detected darker in both air and oil. It forms rims up to 2.5 during the microprobe and optical study. Examina- mm in width, with microscopically-sharpcontacts tion using a Nomanki interference-contrastattach- against the djurleite and, probably, against carrol- ment revealedno zonal or irregular hardnesshetero- lite A. It everywherecontains small (<0.25 mm), geneities.The sulfur content is apparently distinctly and irregularly-vermicular inclusions of a second, lower than that required to satisfythe formula M3Sa, optically-distinct,anisotropic mineral. lending support to the suggestionsof Tarr (1935), Darnley and Killingworth (1962\, and Vokes Carrollite B (1967), amongothers, that somenatural linnaeites Microprobe analysis (Table 2) of the supergene are sulfur-deficient.The experimental evidence for isotropic mineral reveals it to have a composition discretesolid solution in the thiospinel phasein the systemCo-S is, however,ambiguous (Elliot, 1965), and there is apparentlyno information on the phase TlsI-r 2. Compositions of Carrollites A and B and pCo'-"S relationships in this region of the ternary system cocus Total Co-Cu-S. Mi neral weight pe! X-ray powder patterns of this mineral are of the cent carrolliie linnaeitetype, and a unit-cell edgeof 9.468(5) A A 39. O 99.4 was obtained,using an X-ray diffractometer (C\rKa carrollite B 3e.2 20.5 41.5 100.2 gCol-xS radiation;), = 1.5418 A), and metallic silicon 63.80 !0.24 99.85 (5.4306 A) as an internal standard.No previous brobably i.n associated carlollite. ALAN H. CLARK closelyapproaching stoichiometric CozCuS+, the gen- is lessreflectant and appreciablysofter than the en- erally acceptedformula for carrollite sensustricto; it closingcarrollite, and took a mediocrepolish. Aniso' will hereinbe termed"carrollite B." The anisotropic tropism is intense, with purplish-blue colors de- phaseis a cobalt sulfide (Table 2), apparentlyfree velopedin most grainsat the positionsof maximum of copperand other metals. illumination.A poor cleavageor parting in one di- Carrollite B is slightly softer and less reflectant rection is shown by severalgrains; no twinning is than carrolliteA (Table 1), the reflectancedisper- observed.The micro-indentationhardness (Table sion curve retainingthe form of that of other lin- 1) for this phase, determinedfrom four of the naeite-typeminerals. Solid solution of copper in larger grainsusing a lop load, is in the tange224- linnaeite is inferred to causesignificant decreases in 245. However, thesevalues should be regardedas reflectanceand micro-indentationhardness, at least approximate,and perhapsoverestimated, because of over the compositionalrange representedby the the highly irregular contactswith the enclosingcar- Car.izal Alto phases.This conclusionis in agreement rollite. Values for Ro' and R, were determinedfor with the data compiled for the thiospinel minerals six grains;the extremereadings are given in Table 1. by Vaughan,Burns, and Burns (197I), who inter- Electron microprobe analysis of several of the pret the trendsin physicalproperties in the
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