Modern Analytical Facilities 2. A Review of Quality Assurance and Quality Control (QA/QC) Procedures for Lithogeochemical Data

Piercey, Stephen J.

doi:10.12789/geocanj.2014.41.035

Cited by 32 publications

(14 citation statements)

References 18 publications

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“…Most errors associated with mass balance calculations are due to: (1) sampling and analytical errors; (2) erroneous precursor selection; and (3) the mobility of elements normally considered immobile. Analytical errors are easily avoidable with modern procedures and good practices [61], although performing representative sampling is more challenging [30,31] (Section 2.2).…”

Section: Errors Precursors and Immobile Elementsmentioning

confidence: 99%

Quantifying Hydrothermal Alteration: A Review of Methods

Mathieu

2018

Geosciences

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Hydrothermal alteration is proximal to many base and precious metal deposits, and its products can provide insights into the characteristics of hydrothermal systems. To be useful to exploration geologists and researchers, however, alteration needs to be typified and quantified. Alteration type informs on mineralising style (e.g., have we found a porphyry or a volcanogenic massive sulphide deposit?), while quantification of its intensity helps position a sample within the system (e.g., how close are we to the main economic deposit?). Numerous methods-all having their specific advantages and disadvantages-are dedicated to the characterisation of alteration. As alteration is a process that induces chemical and mineralogical changes in rocks, it can be studied using petrological (e.g., mineral recognition in thin sections, mineral chemistry), mineralogical (e.g., alteration indices that use normative minerals), and chemical (e.g., mass balance calculations) approaches. This short review provides an overview of the methods useful to researchers and that are also applicable in an exploration context.

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Section: Errors Precursors and Immobile Elementsmentioning

confidence: 99%

Quantifying Hydrothermal Alteration: A Review of Methods

Mathieu

2018

Geosciences

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“…QA was performed on the NHM's in-house standard, with accuracy and precision data given in Table A.1. Accuracy and precision are defined as excellent for all elements (Piercey, 2014). Only the six PGM with an analytical total of 100 ± 3 are presented, with the rest of the data treated as semi-quantitative.…”

Section: Samples and Methodsmentioning

confidence: 99%

Platinum-group minerals in the Skouries Cu-Au (Pd, Pt, Te) porphyry deposit

McFall

Naden

Roberts

et al. 2018

Ore Geology Reviews

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A B S T R A C TThe Skouries deposit is a platinum-group element (PGE) enriched Cu-Au porphyry system located in the Chalkidiki peninsula, Greece, with associated Ag, Bi and Te enrichment. The deposit is hosted by multiple porphyritic monzonite and syenite intrusions, which originated from a magma chamber at depth. An initial quartz monzonite porphyritic intrusion contains a quartz-magnetite ± chalcopyrite-pyrite vein stockwork with intense potassic alteration. The quartz monzonite intrusion is cross cut by a set of syenite and mafic porphyry dykes and quartz-chalcopyrite-bornite ± magnetite veins which host the majority of the Cu and Au mineralisation. Late stage quartz-pyrite veins, with associated phyllic alteration crosscut all previous vein generations. Electron microprobe and scanning electron microscopy shows that the PGE are hosted by platinum-group minerals (PGM) in the quartz-chalcopyrite-bornite ± magnetite veins and within potassic alteration assemblages. The PGE mineralisation in Skouries is therefore part of the main high temperature hypogene mineralisation event. [PdBi]. The most common platinum-group mineral is sopcheite. The PGM in Skouries are small, 52 µm 2 on average, and occur as spherical grains on the boundaries between sulphides and silicates, and as inclusions within hydrothermal quartz and sulphides. These observations support a "semi-metal collector model" whereby an immiscible Bi-Te melt acts as a collector for PGE and other precious metals in high temperature hydrothermal fluids. This mechanism would allow the formation of PGM in porphyries without Pt and Pd fluid saturation.

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“…Precision and accuracy of the analyses were determined using duplicates and reference materials following methods described in Jenner (1996) and Piercey (2014). The reference materials utilized in the study included three different organic-and/or sulfide-rich shales (SCO-1, SDO-1, and SGR1b) and one iron formation (FeR-1).…”

Section: Sampling Methods and Quality Control And Assurancementioning

confidence: 99%

Geology, Mineralogy, and Lithogeochemistry of Metalliferous Mudstones Associated with the Lemarchant Volcanogenic Massive Sulfide Deposit, Tally Pond Belt, Central Newfoundland

Lode

Piercey

Devine³

2015

Economic Geology

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The Cambrian Lemarchant Zn-Pb-Cu-(Au-Ag) bimodal felsic volcanogenic massive sulfide (VMS) deposit, Tally Pond group, central Newfoundland, Canada, contains metalliferous mudstones that occur either immediately on top or laterally along strike from massive sulfide mineralization, or as interflow mudstones within hanging-wall basaltic rocks. The mudstones are brown to black, graphite rich, and locally have intercalations of siliciclastic, volcaniclastic and/or amorphous chert layers, and, in some cases, fine lamina of organic matter. The main sulfide phases are pyrite (framboidal and euhedral) and pyrrhotite, with minor chalcopyrite, sphalerite, arsenopyrite, and galena; barite is a common sulfate.The metalliferous mudstones occur at various stratigraphic levels and have variable inputs of hydrothermal (high Fe/Al and base metal values) and detrital components (lower Fe/Al and base metal values) with positive shale normalized Eu anomalies (Eu/Eu* ≥1), negative Ce anomalies (Ce/Ce* ≤1), and an average Y/Ho ratio of ~28.3. These signatures suggest precipitation from reduced, high-temperature hydrothermal vent fluids in an oxygenated water column, coupled with the hydrothermal particles having a short residence time within the hydrothermal plume (i.e., a vent proximal setting). Deposition from an oxygenated water column is also supported by the presence of abundant barite in both the Lemarchant massive sulfides and the metalliferous mudstones, as well as locally preserved marcasite in the mudstones. Redox-sensitive trace elements (As, U, V, Mo, Cr, Ni, and Co) were scavenged as oxyanions onto Fe oxyhydroxides during mudstone formation, and these elevated levels of scavenged redox-sensitive trace elements cause apparent anoxic signatures. Immobile element systematics (La-Th-Zr/10 and Th-La-Sc) indicate that the detrital components of the Lemarchant mudstones were mixtures of both continental and mafic sources, most likely deposited within a pericontinental rifted arc environment. Our research illustrates that the lithogeochemistry of metalliferous mudstones can identify vent proximity and provides insights into the physiochemical conditions of the deposit formation and the ambient environment. These results have implications for similar precious metal-bearing VMS deposits globally.

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Modern Analytical Facilities 2. A Review of Quality Assurance and Quality Control (QA/QC) Procedures for Lithogeochemical Data

Cited by 32 publications

References 18 publications

Quantifying Hydrothermal Alteration: A Review of Methods

Quantifying Hydrothermal Alteration: A Review of Methods

Platinum-group minerals in the Skouries Cu-Au (Pd, Pt, Te) porphyry deposit

Geology, Mineralogy, and Lithogeochemistry of Metalliferous Mudstones Associated with the Lemarchant Volcanogenic Massive Sulfide Deposit, Tally Pond Belt, Central Newfoundland

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