LEADER	03633nas a2200241 c 4500
001	129-310672
007	cr
008	2018 p eng
041			|a eng
100			|a Scholten, L  |4 aut
245			|a Nickel and platinum in high-temperature H2O?+?HCl fluids  |b Implications for hydrothermal mobilization
260			|b Elsevier BV  |c 2018
490			|a GEM: Geo-mapping for Energy and Minerals
520			|a The dissolution of NiS and NiAs (nickeline) in 0.1 and 1 molal HCl at 400 ¡C, 80 MPa, and of PtAs2 (sperrylite) and Pt metal in 1 and 6.86 molal HCl at 500 ¡C, 80 MPa was studied in-situ using synchrotron radiation X-ray fluorescence and absorption spectroscopy. The Pt concentration in the fluid averaged 8 á 10?5 molal (12.8 ppm) during dissolution of Pt metal in 6.86 molal HCl, and was below the minimum detection limit (mdl; 2.6 á 10?5 molal) in all other experiments. Dissolution of NiS was congruent or nearly congruent. Equilibrium was attained rapidly in about 250 min at an initial HCl concentration of 1 molal HCl, and in about 500 min at 0.1 molal HCl. Addition of HCl resulted in a large increase in the Ni solubility from 7.2 á 10?3 molal Ni (423 ppm) at 0.1 molal HCl to 8.72 á 10?2 molal Ni (4959 ppm) at 1 molal HCl. Dissolution of NiAs in 0.1 and 1 molal HCl was incongruent. A steady state was not reached even at a run duration of more than 16 h, and the maximum recorded Ni concentrations in the fluid were much lower than the Ni solubility in the corresponding experiments with NiS at the same HCl molality. Measured K-edge XANES spectra in comparison with literature data indicated that arsenic in the fluid was present as As(V) and that nickel complexed with Cl and H2O as tetrahedral [NiCl2(H2O)2]0 and [NiCl3(H2O)]? and octahedral [NiCl2(H2O)4]0 species. In addition, Raman spectra of H2O + NiCl2 and H2O + NiCl2 + HCl solutions and of H2O + HCl fluids reacted with NiS crystals were acquired at temperatures (T) up to 600 ¡C and pressures (P) up to 1.15 GPa. All spectra at T ³ 300 ¡C and P < 600 MPa showed a previously not reported Raman peak at ?280 cm?1 together with a weaker peak at ?230 cm?1. These peaks can be assigned to NiÐCl vibrations. The band at 280 cm?1 was not detected at the other P-T conditions. Based on calculated vibrational frequencies available in the literature, it may stem from the species [NiCl4]2Ð or [NiCl2(H2O)4]0, although particularly the first assignment is in conflict with the information from published XAS data. The results of this study demonstrate that nickel is readily mobilized by acidic chloridic hydrothermal fluids, but platinum remains practically immobile in such fluids at any HCl concentration that is conceivable to occur in nature. Therefore, the enrichment of Pt relative to Ni in footwall-type deposits in the Sudbury District and the growth of large sperrylite crystals are likely related to magmatic processes. Furthermore, the experiments point to the importance of redox reactions for the mobilization and precipitation of arsenides and suggest that arsenate species are more stable in hydrothermal fluids than previously thought.
655			|a Zeitschrift
700			|a Watenphul, A  |4 aut
700			|a Beermann, O  |4 aut
700			|a Testemale, D  |4 aut
700			|a Ames, D  |4 aut
700			|a Schmidt, C  |4 aut
773	0	8	|g Geochimica et Cosmochimica Acta vol. 224, 2018 p. 187-199, Natural Resources Canada, Contribution Series
856	4	0	|q text/html  |3 Link zur Ressource  |u https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/fulle.web&search1=R=310672
980			|a 310672  |b 129  |c sid-129-col-geoscan

openURL url_ver=Z39.88-2004&ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fwww.ub.tu-freiberg.de%3Agenerator&rft.title=Nickel+and+platinum+in+high-temperature+H2O%3F%2B%3FHCl+fluids%3A+Implications+for+hydrothermal+mobilization&rft.date=2018&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.creator=Scholten%2C+L&rft.pub=Elsevier+BV&rft.format=ElectronicJournal&rft.language=English

SOLR

_version_	1789612880370335744
access_facet	Electronic Resources
author	Scholten, L, Watenphul, A, Beermann, O, Testemale, D, Ames, D, Schmidt, C
author_facet	Scholten, L, Watenphul, A, Beermann, O, Testemale, D, Ames, D, Schmidt, C
author_role	aut, aut, aut, aut, aut, aut
author_sort	Scholten, L
author_variant	l s ls, a w aw, o b ob, d t dt, d a da, c s cs
building	Library A
callnumber-sort
collection	sid-129-col-geoscan
container_reference	Geochimica et Cosmochimica Acta vol. 224, 2018 p. 187-199, Natural Resources Canada, Contribution Series
contents	The dissolution of NiS and NiAs (nickeline) in 0.1 and 1 molal HCl at 400 ¡C, 80 MPa, and of PtAs2 (sperrylite) and Pt metal in 1 and 6.86 molal HCl at 500 ¡C, 80 MPa was studied in-situ using synchrotron radiation X-ray fluorescence and absorption spectroscopy. The Pt concentration in the fluid averaged 8 á 10?5 molal (12.8 ppm) during dissolution of Pt metal in 6.86 molal HCl, and was below the minimum detection limit (mdl; 2.6 á 10?5 molal) in all other experiments. Dissolution of NiS was congruent or nearly congruent. Equilibrium was attained rapidly in about 250 min at an initial HCl concentration of 1 molal HCl, and in about 500 min at 0.1 molal HCl. Addition of HCl resulted in a large increase in the Ni solubility from 7.2 á 10?3 molal Ni (423 ppm) at 0.1 molal HCl to 8.72 á 10?2 molal Ni (4959 ppm) at 1 molal HCl. Dissolution of NiAs in 0.1 and 1 molal HCl was incongruent. A steady state was not reached even at a run duration of more than 16 h, and the maximum recorded Ni concentrations in the fluid were much lower than the Ni solubility in the corresponding experiments with NiS at the same HCl molality. Measured K-edge XANES spectra in comparison with literature data indicated that arsenic in the fluid was present as As(V) and that nickel complexed with Cl and H2O as tetrahedral [NiCl2(H2O)2]0 and [NiCl3(H2O)]? and octahedral [NiCl2(H2O)4]0 species. In addition, Raman spectra of H2O + NiCl2 and H2O + NiCl2 + HCl solutions and of H2O + HCl fluids reacted with NiS crystals were acquired at temperatures (T) up to 600 ¡C and pressures (P) up to 1.15 GPa. All spectra at T ³ 300 ¡C and P < 600 MPa showed a previously not reported Raman peak at ?280 cm?1 together with a weaker peak at ?230 cm?1. These peaks can be assigned to NiÐCl vibrations. The band at 280 cm?1 was not detected at the other P-T conditions. Based on calculated vibrational frequencies available in the literature, it may stem from the species [NiCl4]2Ð or [NiCl2(H2O)4]0, although particularly the first assignment is in conflict with the information from published XAS data. The results of this study demonstrate that nickel is readily mobilized by acidic chloridic hydrothermal fluids, but platinum remains practically immobile in such fluids at any HCl concentration that is conceivable to occur in nature. Therefore, the enrichment of Pt relative to Ni in footwall-type deposits in the Sudbury District and the growth of large sperrylite crystals are likely related to magmatic processes. Furthermore, the experiments point to the importance of redox reactions for the mobilization and precipitation of arsenides and suggest that arsenate species are more stable in hydrothermal fluids than previously thought.
facet_avail	Online
format	ElectronicJournal
format_access_txtF_mv	Journal, E-Journal
format_de105	Ebook
format_de14	Journal, E-Journal
format_de15	Journal, E-Journal
format_del152	Buch
format_detail_txtF_mv	text-online-journal-parent
format_dezi4	Journal
format_finc	Journal, E-Journal
format_legacy	ElectronicJournal
format_legacy_nrw	Journal, E-Journal
format_nrw	Journal, E-Journal
format_strict_txtF_mv	E-Journal
genre	Zeitschrift
genre_facet	Zeitschrift
geogr_code	not assigned
geogr_code_person	not assigned
hierarchy_parent_id
hierarchy_parent_title
hierarchy_sequence	Geochimica et Cosmochimica Acta vol. 224, 2018 p. 187-199, Natural Resources Canada, Contribution Series
hierarchy_top_id
hierarchy_top_title	, Nickel and platinum in high-temperature H2O?+?HCl fluids: Implications for hydrothermal mobilization
id	129-310672
illustrated	Illustrated
imprint	Elsevier BV, 2018
imprint_str_mv	Elsevier BV, 2018
institution	FID-MONTAN-DE-105
is_hierarchy_id	129-310672
is_hierarchy_title	Nickel and platinum in high-temperature H2O?+?HCl fluids: Implications for hydrothermal mobilization
language	English
last_indexed	2024-01-31T13:30:37.96Z
match_str	scholten2018nickelandplatinuminhightemperatureh2ohclfluidsimplicationsforhydrothermalmobilization
mega_collection	GEOSCAN
publishDate	2018
publishDateSort	2018
publishPlace
publisher	Elsevier BV
record_format	marcfinc
record_id	310672
recordtype	marcfinc
rvk_facet	No subject assigned
score	17,668644
series2	GEM: Geo-mapping for Energy and Minerals
source_id	129
spelling	Scholten, L aut, Nickel and platinum in high-temperature H2O?+?HCl fluids Implications for hydrothermal mobilization, Elsevier BV 2018, GEM: Geo-mapping for Energy and Minerals, The dissolution of NiS and NiAs (nickeline) in 0.1 and 1 molal HCl at 400 ¡C, 80 MPa, and of PtAs2 (sperrylite) and Pt metal in 1 and 6.86 molal HCl at 500 ¡C, 80 MPa was studied in-situ using synchrotron radiation X-ray fluorescence and absorption spectroscopy. The Pt concentration in the fluid averaged 8 á 10?5 molal (12.8 ppm) during dissolution of Pt metal in 6.86 molal HCl, and was below the minimum detection limit (mdl; 2.6 á 10?5 molal) in all other experiments. Dissolution of NiS was congruent or nearly congruent. Equilibrium was attained rapidly in about 250 min at an initial HCl concentration of 1 molal HCl, and in about 500 min at 0.1 molal HCl. Addition of HCl resulted in a large increase in the Ni solubility from 7.2 á 10?3 molal Ni (423 ppm) at 0.1 molal HCl to 8.72 á 10?2 molal Ni (4959 ppm) at 1 molal HCl. Dissolution of NiAs in 0.1 and 1 molal HCl was incongruent. A steady state was not reached even at a run duration of more than 16 h, and the maximum recorded Ni concentrations in the fluid were much lower than the Ni solubility in the corresponding experiments with NiS at the same HCl molality. Measured K-edge XANES spectra in comparison with literature data indicated that arsenic in the fluid was present as As(V) and that nickel complexed with Cl and H2O as tetrahedral [NiCl2(H2O)2]0 and [NiCl3(H2O)]? and octahedral [NiCl2(H2O)4]0 species. In addition, Raman spectra of H2O + NiCl2 and H2O + NiCl2 + HCl solutions and of H2O + HCl fluids reacted with NiS crystals were acquired at temperatures (T) up to 600 ¡C and pressures (P) up to 1.15 GPa. All spectra at T ³ 300 ¡C and P < 600 MPa showed a previously not reported Raman peak at ?280 cm?1 together with a weaker peak at ?230 cm?1. These peaks can be assigned to NiÐCl vibrations. The band at 280 cm?1 was not detected at the other P-T conditions. Based on calculated vibrational frequencies available in the literature, it may stem from the species [NiCl4]2Ð or [NiCl2(H2O)4]0, although particularly the first assignment is in conflict with the information from published XAS data. The results of this study demonstrate that nickel is readily mobilized by acidic chloridic hydrothermal fluids, but platinum remains practically immobile in such fluids at any HCl concentration that is conceivable to occur in nature. Therefore, the enrichment of Pt relative to Ni in footwall-type deposits in the Sudbury District and the growth of large sperrylite crystals are likely related to magmatic processes. Furthermore, the experiments point to the importance of redox reactions for the mobilization and precipitation of arsenides and suggest that arsenate species are more stable in hydrothermal fluids than previously thought., Zeitschrift, Watenphul, A aut, Beermann, O aut, Testemale, D aut, Ames, D aut, Schmidt, C aut, Geochimica et Cosmochimica Acta vol. 224, 2018 p. 187-199, Natural Resources Canada, Contribution Series , text/html Link zur Ressource https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/fulle.web&search1=R=310672
spellingShingle	Scholten, L, Watenphul, A, Beermann, O, Testemale, D, Ames, D, Schmidt, C, Nickel and platinum in high-temperature H2O?+?HCl fluids: Implications for hydrothermal mobilization, The dissolution of NiS and NiAs (nickeline) in 0.1 and 1 molal HCl at 400 ¡C, 80 MPa, and of PtAs2 (sperrylite) and Pt metal in 1 and 6.86 molal HCl at 500 ¡C, 80 MPa was studied in-situ using synchrotron radiation X-ray fluorescence and absorption spectroscopy. The Pt concentration in the fluid averaged 8 á 10?5 molal (12.8 ppm) during dissolution of Pt metal in 6.86 molal HCl, and was below the minimum detection limit (mdl; 2.6 á 10?5 molal) in all other experiments. Dissolution of NiS was congruent or nearly congruent. Equilibrium was attained rapidly in about 250 min at an initial HCl concentration of 1 molal HCl, and in about 500 min at 0.1 molal HCl. Addition of HCl resulted in a large increase in the Ni solubility from 7.2 á 10?3 molal Ni (423 ppm) at 0.1 molal HCl to 8.72 á 10?2 molal Ni (4959 ppm) at 1 molal HCl. Dissolution of NiAs in 0.1 and 1 molal HCl was incongruent. A steady state was not reached even at a run duration of more than 16 h, and the maximum recorded Ni concentrations in the fluid were much lower than the Ni solubility in the corresponding experiments with NiS at the same HCl molality. Measured K-edge XANES spectra in comparison with literature data indicated that arsenic in the fluid was present as As(V) and that nickel complexed with Cl and H2O as tetrahedral [NiCl2(H2O)2]0 and [NiCl3(H2O)]? and octahedral [NiCl2(H2O)4]0 species. In addition, Raman spectra of H2O + NiCl2 and H2O + NiCl2 + HCl solutions and of H2O + HCl fluids reacted with NiS crystals were acquired at temperatures (T) up to 600 ¡C and pressures (P) up to 1.15 GPa. All spectra at T ³ 300 ¡C and P < 600 MPa showed a previously not reported Raman peak at ?280 cm?1 together with a weaker peak at ?230 cm?1. These peaks can be assigned to NiÐCl vibrations. The band at 280 cm?1 was not detected at the other P-T conditions. Based on calculated vibrational frequencies available in the literature, it may stem from the species [NiCl4]2Ð or [NiCl2(H2O)4]0, although particularly the first assignment is in conflict with the information from published XAS data. The results of this study demonstrate that nickel is readily mobilized by acidic chloridic hydrothermal fluids, but platinum remains practically immobile in such fluids at any HCl concentration that is conceivable to occur in nature. Therefore, the enrichment of Pt relative to Ni in footwall-type deposits in the Sudbury District and the growth of large sperrylite crystals are likely related to magmatic processes. Furthermore, the experiments point to the importance of redox reactions for the mobilization and precipitation of arsenides and suggest that arsenate species are more stable in hydrothermal fluids than previously thought., Zeitschrift
title	Nickel and platinum in high-temperature H2O?+?HCl fluids: Implications for hydrothermal mobilization
title_auth	Nickel and platinum in high-temperature H2O?+?HCl fluids Implications for hydrothermal mobilization
title_full	Nickel and platinum in high-temperature H2O?+?HCl fluids Implications for hydrothermal mobilization
title_fullStr	Nickel and platinum in high-temperature H2O?+?HCl fluids Implications for hydrothermal mobilization
title_full_unstemmed	Nickel and platinum in high-temperature H2O?+?HCl fluids Implications for hydrothermal mobilization
title_in_hierarchy
title_short	Nickel and platinum in high-temperature H2O?+?HCl fluids
title_sort	nickel and platinum in high temperature h2o hcl fluids implications for hydrothermal mobilization
title_sub	Implications for hydrothermal mobilization
title_unstemmed	Nickel and platinum in high-temperature H2O?+?HCl fluids: Implications for hydrothermal mobilization
topic	Zeitschrift
topic_facet	Zeitschrift
url	https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/fulle.web&search1=R=310672