Geochemistry of platinum-group elements in the Tulameen ultramafic complex, southern British Columbia

Louis, Robert M. St.; Nesbitt, Bruce E.; Morton, R. D.

doi:10.2113/gsecongeo.81.4.961

Cited by 19 publications

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“…Spect. : Thompson and Bankston (); b XRF: Hickson and Juras (); c INAA: St. Louis (); d XRF: Joron et al . (); e INAA, ICP‐OES: Iwansson and Landström ().…”

Section: Resultsmentioning

confidence: 99%

An Evaluation of the Effects of Primary and Cross‐Contamination during the Preparation of Rock Powders for Chemical Determinations

Sertek

Andrade

Ulbrich

2015

Geostandard Geoanalytic Res

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Quartz crystals from the Batatal site, Minas Gerais, southern Brazil, were used to determine quantitatively primary contamination when submitting the samples to milling processes. Crushing devices used were a primary steel jaw crusher (br1), a secondary tungsten carbide (WC) crusher (br2) and a hydraulic press with stainless steel plates (pr). Fragments with suitable sizes were then ground in different Fritsch planetary mills, equipped with agate, WC and chromium‐steel rings for 7, 4 and 3 min, respectively. Solutions of the powders were analysed initially with the TotalQuant™ method in a quadrupole ICP‐MS instrument, providing semi‐quantitative results for seventy‐five elements. Contamination from crushers and mills was visible in major and minor elements such as Fe, Mn and Ti, and noticeable in trace elements such as Cr, Co, Ni, Cu and also V, Zr, Sc; significant contamination was observed from W, Mo, Co, Ta and Nb (mainly by use of the WC devices). Little or no contamination was observed for Pb, REE, Sr and Rb, elements that are important in routine isotopic determinations. Cross‐contamination was tested by grinding either a granite or a basalt sample, followed by conventional cleaning with mica‐free quartz sand, before the working quartz powder was prepared.

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“…Spect. : Thompson and Bankston (); b XRF: Hickson and Juras (); c INAA: St. Louis (); d XRF: Joron et al . (); e INAA, ICP‐OES: Iwansson and Landström ().…”

Section: Resultsmentioning

confidence: 99%

An Evaluation of the Effects of Primary and Cross‐Contamination during the Preparation of Rock Powders for Chemical Determinations

Sertek

Andrade

Ulbrich

2015

Geostandard Geoanalytic Res

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Distribution of gold in the Earth’s crust

Crocket¹

1993

Gold Metallogeny and Exploration

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Chromite composition and platinum-group mineral assemblage in the Uktus Uralian-Alaskan-type complex (Central Urals, Russia)

et al. 2003

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Chromitite segregations in dunites of the Uktus Uralian-Alaskan-type complex (Central Urals, Russia) display large variation of the chromite composition: Cr/ (Cr+Al)=0.46-0.77, Fe 2+ /(Fe 2+ +Mg)=0.28-0.66, and Fe 3+ /(Fe 3+ +Fe 2+ )=0.23-0.59. Three types of PGM assemblages have been recognized, varying in accordance with chromite composition: type I, dominated by Ru-Os-Ir (sulfides), is associated with magnesiochromite having Fe 3+ /(Fe 3+ +Fe 2+ )<0.30, in the southern dunite body. Type II, containing abundant PtIr (alloys, minor sulfides), is found in magnesiochromite with Fe 3+ /(Fe 3+ +Fe 2+ )=0.40-0.44; type III, consisting of Ir-Rh-Pt-Pd (alloys, sulfarsenides, antimonides) in Fe-rich chromite having Fe 2+ /(Fe 2+ +Mg)=0.66 and Fe 3+ /(Fe 3+ +Fe 2+ )=0.59. Positive anomalies of Ir and Pt, and a negative peak of Ru characterize the PGE patterns of chromitites with type II and III PGM assemblages, whereas a positive Pt anomaly is observed in their dunite host. Intensive fractionation of Pt-Fe alloys in the Uktus chromitites reflects the anomalous behavior of Pt which is decoupled from Rh and Pd. Among other factors, the high iron activity and oxygen fugacity in the parent melt appear to exert a major control on precipitation of Pt-Fe alloys, below sulfur saturation. The strong Pt anomaly in chromitites from Uktus may indicate that Uralian-Alaskan-type magmas were derived from a Pt-rich mantle source.

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Geochemistry of platinum-group elements in the Tulameen ultramafic complex, southern British Columbia

Cited by 19 publications

References 0 publications

An Evaluation of the Effects of Primary and Cross‐Contamination during the Preparation of Rock Powders for Chemical Determinations

An Evaluation of the Effects of Primary and Cross‐Contamination during the Preparation of Rock Powders for Chemical Determinations

Distribution of gold in the Earth’s crust

Chromite composition and platinum-group mineral assemblage in the Uktus Uralian-Alaskan-type complex (Central Urals, Russia)

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