Contrasting fluids and reservoirs in the contiguous Marcona and Mina Justa iron oxide–Cu (–Ag–Au) deposits, south-central Perú

Chen, Hong‐Yuan; Kyser, T. Kurtis; Clark, Alan H.

doi:10.1007/s00126-011-0343-x

Cited by 64 publications

(11 citation statements)

References 69 publications

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“…Stable isotope evidence for a non-magmatic origin, at least for sulphur and oxygen, was presented by Ullrich and Clark (1999) for La Candelaria, the most important Cu-rich IOCG deposit in the Central Andes, but the incursion of basinal fluids had earlier been documented at Olympic Dam by Haynes et al (1995). Although the ore metals, i.e., Cu and Au in these deposits, may be, at least in part, magma-derived (Marschik and Fontboté, 2001;Rieger et al, 2010), such inherently complex genetic models have direct implications for the occurrence of, and hence exploration for, Cu-rich IOCG's, as is exemplified by the studies of Benavides et al (2007) in the Mantoverde district of northern Chile, Chen et al (2010Chen et al ( , 2011 in the Mina Justa deposit of southern Peru and Monteiro et al (2008) in the Carajás district of Brazil.…”

Section: Controversial Ore Genesismentioning

confidence: 84%

“…Although the sources of the ore metals remain problematic in most IOCG deposits, external sulphur, from either surficial basinal brines and seawater (e.g., Central Andean, Olympic Dam and Carajas IOCG deposits: Benavides et al, 2007;Chen et al, 2011;Haynes et al, 1995;Monteiro et al, 2008) or formation water and metamorphic fluids (e.g., the Cloncurry deposits: Kendrick et al, 2007), or introduced by magmatic assimilation of metasedimentary units (e.g., Phalaborwa: Drüppel et al, 2006;Mitchell and Krouse, 1975), has been documented in most, if not all, major Cu-rich IOCG centres.…”

Section: Controversial Ore Genesismentioning

confidence: 99%

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External sulphur in IOCG mineralization: Implications on definition and classification of the IOCG clan

Chen

2013

Ore Geology Reviews

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Section: Controversial Ore Genesismentioning

confidence: 84%

Section: Controversial Ore Genesismentioning

confidence: 99%

External sulphur in IOCG mineralization: Implications on definition and classification of the IOCG clan

Chen

2013

Ore Geology Reviews

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“…basinal brines heated by intrusions (e.g., Barton and Johnson, 1996;Ulrich and Clark, 1999;Chen et al, 2011) (Fig. 2).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Unraveling the origin of the Andean IOCG clan: A Re-Os isotope approach

Barra

Reich

Selby

et al. 2017

Ore Geology Reviews

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'Unraveling the origin of the Andean IOCG clan : a Re-Os isotope approach.', Ore geology reviews., 81 (Part 1). pp. 62-78. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T Chilean IOCGs is the result of different events with metals derived from diverse sources i.e., the magmatic-hydrothermal system and basement/host rocks. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTRhenium and Os concentrations for the various studied deposits vary over a wide range of values at the ppb and ppt level, respectively, with many sulfides and magnetite bearing appreciable no common Os. The Re and Os contents in sulfides (pyrite, IOCGs in China and Australia argue for the involvement of a much more radiogenic crustal source possibly related to non-magmatic oxidized saline brines that leached basement rocks. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTWe conclude that Andean IOCG (and IOA) deposits in northern Chile were formed mainly by magmatic-hydrothermal processes related to the formation and emplacement of plutonic rocks with moderate contribution from leaching of basement and/or volcanic host rocks. Surface or basin-derived brines as well as sediments appear to play only a minor role in the formation of the Chilean IOCG clan.

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“…4 Detection based on time-of-ight mass spectrometers coupled to laser ablation (LA-ICPTOFMS, hereaer called TOFMS) has been considered highly promising for multielement analysis of very short transient signals, because it allows quasi-simultaneous measurements of all isotopes. 4,39 Nevertheless, previous study on multiphase uid inclusions from the Mole granite 38 demonstrated the abilities of axial TOFMS for the detection of up to 42 isotopes above the LODs, as well as the discrimination of signals of elements contained in uid or in solid matrices. 14,36,37 First generations of TOFMS with an axial conguration applied to natural uid inclusions had lower sensitivities, low signal to noise ratio, low dynamic range and higher limits of detection compared to QMS.…”

Section: Introductionmentioning

confidence: 99%

Capabilities of sequential and quasi-simultaneous LA-ICPMS for the multi-element analysis of small quantity of liquids (pl to nl): insights from fluid inclusion analysis

Harlaux

Borovinskaya

Frick

et al. 2015

J. Anal. At. Spectrom.

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International audienceThree configurations of inductively coupled plasma mass spectrometers (ICPMS), namely: a quadrupole (QMS) and a sector-field (SFMS), both equipped with a standard cylindrical ablation cell, and an orthogonal time-of-flight (TOFMS), equipped with a fast washout ablation cell, were coupled with the same 193 nm Excimer laser ablation system in order to evaluate their capabilities for measurement of multiple minor and trace elements in small quantities of liquids (pl to nl), such as fluid inclusions. Analyses were performed with different objects: (i) multi-element solutions sealed in silica capillaries of internal diameter of 20 mm serving as synthetic analogues of natural fluid inclusions; (ii) natural two-phase (liquid + vapour) fluid inclusions with low salinity (ca. 4.8 wt% NaCl eq.) and homogeneous compositions, trapped in quartz crystals from the Alps; (iii) natural multi-phase (liquid + vapour + multiple solids) fluid inclusions with high salinity (ca. 13-15 wt% NaCl eq.) and homogeneous compositions, trapped in quartz crystals from the Zambian Copperbelt. This study demonstrates that the SFMS and TOFMS provide improvements, particularly in term of limits of detection (LODs) and precision, compared to the QMS traditionally used for the measurement of fluid inclusions. SFMS leads on average to lower LODs within one order of magnitude compared to QMS and TOFMS, but precision and accuracy are lower due to longer acquisition cycle times. TOFMS presents both advantages of having rapid and quasi-simultaneous acquisition for all isotopes from Li-6 to U-238 in a very short cycle time down to 30 ms, with higher precisions and lower LODs than for QMS for isotopes with m/Q > 11. Its use, coupled to a fast washout cell, leads to (i) the improvement in the analysis of small-size (<10 mu m) and multi-phase fluid inclusions and (ii) detection of higher number of isotopes compared to QMS and SFMS, which are both limited by the number of measured isotopes from short transient signals of fluid inclusions. Consequently, the tested TOFMS, coupled with a fast washout ablation cell, appears to be a promising instrument for the analysis of natural fluid inclusions by LA-ICPMS, especially for small, multi-phase and/or low salinity fluid inclusions

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Contrasting fluids and reservoirs in the contiguous Marcona and Mina Justa iron oxide–Cu (–Ag–Au) deposits, south-central Perú

Cited by 64 publications

References 69 publications

External sulphur in IOCG mineralization: Implications on definition and classification of the IOCG clan

External sulphur in IOCG mineralization: Implications on definition and classification of the IOCG clan

Unraveling the origin of the Andean IOCG clan: A Re-Os isotope approach

Capabilities of sequential and quasi-simultaneous LA-ICPMS for the multi-element analysis of small quantity of liquids (pl to nl): insights from fluid inclusion analysis

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