Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas

The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms, ∼2.9–2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals sugges...
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Autor*in:	Riding, Robert [verfasserIn] Liang, Liyuan [verfasserIn] Fralick, Philip [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2022

Schlagwörter:	Archean Canada Carbonate Oxygenation Seawater

Übergeordnetes Werk:	Enthalten in: Precambrian research - Amsterdam [u.a.] : Elsevier Science, 1974, 383
Übergeordnetes Werk:	volume:383

DOI / URN:	10.1016/j.precamres.2022.106902

Katalog-ID:	ELV008902976

Internformat


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520			\|a The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms, ∼2.9–2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals suggest platform margin precipitation, both as seafloor crusts and in the water column, during mixing of anoxic offshore and oxygenated onshore water masses in dynamic chemoclines. Platform interiors were subject to short-lived influxes of Fe-rich anoxic offshore waters that variously precipitated aragonite, herringbone calcite, Fe-dolomite, and rare siderite. Overall, these observations are consistent with chemical equilibrium analysis assuming three co-existing confluent carbonate water masses: (i) offshore anoxic iron-rich seawater, precipitating Fe-carbonate, (ii) a chemocline mixing zone variously precipitating interlayered aragonite, calcite and Fe oxide, (iii) onshore iron-poor seawater precipitating calcite and aragonite in an ‘Oxygen Oasis’. In this system, Fe2+, at ∼ 3 orders of magnitude lower level, supersedes the effect of Mg2+ on Ca-carbonate mineralogy. Only when sufficient Fe2+ was removed by oxygenation did the relative concentrations of Mg2+ and Ca2+ determine CaCO3 mineralogy. Platform margin chemoclines created by oxygen production likely persisted throughout the Archean.
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matchkey_str	article:03019268:2022----::xgnnueceolnpeiiaineweaceneih
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allfields	10.1016/j.precamres.2022.106902 doi (DE-627)ELV008902976 (ELSEVIER)S0301-9268(22)00346-1 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl Riding, Robert verfasserin aut Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms, ∼2.9–2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals suggest platform margin precipitation, both as seafloor crusts and in the water column, during mixing of anoxic offshore and oxygenated onshore water masses in dynamic chemoclines. Platform interiors were subject to short-lived influxes of Fe-rich anoxic offshore waters that variously precipitated aragonite, herringbone calcite, Fe-dolomite, and rare siderite. Overall, these observations are consistent with chemical equilibrium analysis assuming three co-existing confluent carbonate water masses: (i) offshore anoxic iron-rich seawater, precipitating Fe-carbonate, (ii) a chemocline mixing zone variously precipitating interlayered aragonite, calcite and Fe oxide, (iii) onshore iron-poor seawater precipitating calcite and aragonite in an ‘Oxygen Oasis’. In this system, Fe2+, at ∼ 3 orders of magnitude lower level, supersedes the effect of Mg2+ on Ca-carbonate mineralogy. Only when sufficient Fe2+ was removed by oxygenation did the relative concentrations of Mg2+ and Ca2+ determine CaCO3 mineralogy. Platform margin chemoclines created by oxygen production likely persisted throughout the Archean. Archean Canada Carbonate Oxygenation Seawater Liang, Liyuan verfasserin aut Fralick, Philip verfasserin aut Enthalten in Precambrian research Amsterdam [u.a.] : Elsevier Science, 1974 383 Online-Ressource (DE-627)306661411 (DE-600)1500672-4 (DE-576)259484253 0301-9268 nnns volume:383 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.00 Geowissenschaften: Allgemeines AR 383
spelling	10.1016/j.precamres.2022.106902 doi (DE-627)ELV008902976 (ELSEVIER)S0301-9268(22)00346-1 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl Riding, Robert verfasserin aut Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms, ∼2.9–2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals suggest platform margin precipitation, both as seafloor crusts and in the water column, during mixing of anoxic offshore and oxygenated onshore water masses in dynamic chemoclines. Platform interiors were subject to short-lived influxes of Fe-rich anoxic offshore waters that variously precipitated aragonite, herringbone calcite, Fe-dolomite, and rare siderite. Overall, these observations are consistent with chemical equilibrium analysis assuming three co-existing confluent carbonate water masses: (i) offshore anoxic iron-rich seawater, precipitating Fe-carbonate, (ii) a chemocline mixing zone variously precipitating interlayered aragonite, calcite and Fe oxide, (iii) onshore iron-poor seawater precipitating calcite and aragonite in an ‘Oxygen Oasis’. In this system, Fe2+, at ∼ 3 orders of magnitude lower level, supersedes the effect of Mg2+ on Ca-carbonate mineralogy. Only when sufficient Fe2+ was removed by oxygenation did the relative concentrations of Mg2+ and Ca2+ determine CaCO3 mineralogy. Platform margin chemoclines created by oxygen production likely persisted throughout the Archean. Archean Canada Carbonate Oxygenation Seawater Liang, Liyuan verfasserin aut Fralick, Philip verfasserin aut Enthalten in Precambrian research Amsterdam [u.a.] : Elsevier Science, 1974 383 Online-Ressource (DE-627)306661411 (DE-600)1500672-4 (DE-576)259484253 0301-9268 nnns volume:383 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.00 Geowissenschaften: Allgemeines AR 383
allfields_unstemmed	10.1016/j.precamres.2022.106902 doi (DE-627)ELV008902976 (ELSEVIER)S0301-9268(22)00346-1 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl Riding, Robert verfasserin aut Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms, ∼2.9–2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals suggest platform margin precipitation, both as seafloor crusts and in the water column, during mixing of anoxic offshore and oxygenated onshore water masses in dynamic chemoclines. Platform interiors were subject to short-lived influxes of Fe-rich anoxic offshore waters that variously precipitated aragonite, herringbone calcite, Fe-dolomite, and rare siderite. Overall, these observations are consistent with chemical equilibrium analysis assuming three co-existing confluent carbonate water masses: (i) offshore anoxic iron-rich seawater, precipitating Fe-carbonate, (ii) a chemocline mixing zone variously precipitating interlayered aragonite, calcite and Fe oxide, (iii) onshore iron-poor seawater precipitating calcite and aragonite in an ‘Oxygen Oasis’. In this system, Fe2+, at ∼ 3 orders of magnitude lower level, supersedes the effect of Mg2+ on Ca-carbonate mineralogy. Only when sufficient Fe2+ was removed by oxygenation did the relative concentrations of Mg2+ and Ca2+ determine CaCO3 mineralogy. Platform margin chemoclines created by oxygen production likely persisted throughout the Archean. Archean Canada Carbonate Oxygenation Seawater Liang, Liyuan verfasserin aut Fralick, Philip verfasserin aut Enthalten in Precambrian research Amsterdam [u.a.] : Elsevier Science, 1974 383 Online-Ressource (DE-627)306661411 (DE-600)1500672-4 (DE-576)259484253 0301-9268 nnns volume:383 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.00 Geowissenschaften: Allgemeines AR 383
allfieldsGer	10.1016/j.precamres.2022.106902 doi (DE-627)ELV008902976 (ELSEVIER)S0301-9268(22)00346-1 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl Riding, Robert verfasserin aut Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms, ∼2.9–2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals suggest platform margin precipitation, both as seafloor crusts and in the water column, during mixing of anoxic offshore and oxygenated onshore water masses in dynamic chemoclines. Platform interiors were subject to short-lived influxes of Fe-rich anoxic offshore waters that variously precipitated aragonite, herringbone calcite, Fe-dolomite, and rare siderite. Overall, these observations are consistent with chemical equilibrium analysis assuming three co-existing confluent carbonate water masses: (i) offshore anoxic iron-rich seawater, precipitating Fe-carbonate, (ii) a chemocline mixing zone variously precipitating interlayered aragonite, calcite and Fe oxide, (iii) onshore iron-poor seawater precipitating calcite and aragonite in an ‘Oxygen Oasis’. In this system, Fe2+, at ∼ 3 orders of magnitude lower level, supersedes the effect of Mg2+ on Ca-carbonate mineralogy. Only when sufficient Fe2+ was removed by oxygenation did the relative concentrations of Mg2+ and Ca2+ determine CaCO3 mineralogy. Platform margin chemoclines created by oxygen production likely persisted throughout the Archean. Archean Canada Carbonate Oxygenation Seawater Liang, Liyuan verfasserin aut Fralick, Philip verfasserin aut Enthalten in Precambrian research Amsterdam [u.a.] : Elsevier Science, 1974 383 Online-Ressource (DE-627)306661411 (DE-600)1500672-4 (DE-576)259484253 0301-9268 nnns volume:383 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.00 Geowissenschaften: Allgemeines AR 383
allfieldsSound	10.1016/j.precamres.2022.106902 doi (DE-627)ELV008902976 (ELSEVIER)S0301-9268(22)00346-1 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl Riding, Robert verfasserin aut Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms, ∼2.9–2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals suggest platform margin precipitation, both as seafloor crusts and in the water column, during mixing of anoxic offshore and oxygenated onshore water masses in dynamic chemoclines. Platform interiors were subject to short-lived influxes of Fe-rich anoxic offshore waters that variously precipitated aragonite, herringbone calcite, Fe-dolomite, and rare siderite. Overall, these observations are consistent with chemical equilibrium analysis assuming three co-existing confluent carbonate water masses: (i) offshore anoxic iron-rich seawater, precipitating Fe-carbonate, (ii) a chemocline mixing zone variously precipitating interlayered aragonite, calcite and Fe oxide, (iii) onshore iron-poor seawater precipitating calcite and aragonite in an ‘Oxygen Oasis’. In this system, Fe2+, at ∼ 3 orders of magnitude lower level, supersedes the effect of Mg2+ on Ca-carbonate mineralogy. Only when sufficient Fe2+ was removed by oxygenation did the relative concentrations of Mg2+ and Ca2+ determine CaCO3 mineralogy. Platform margin chemoclines created by oxygen production likely persisted throughout the Archean. Archean Canada Carbonate Oxygenation Seawater Liang, Liyuan verfasserin aut Fralick, Philip verfasserin aut Enthalten in Precambrian research Amsterdam [u.a.] : Elsevier Science, 1974 383 Online-Ressource (DE-627)306661411 (DE-600)1500672-4 (DE-576)259484253 0301-9268 nnns volume:383 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.00 Geowissenschaften: Allgemeines AR 383
language	English
source	Enthalten in Precambrian research 383 volume:383
sourceStr	Enthalten in Precambrian research 383 volume:383
format_phy_str_mv	Article
bklname	Geowissenschaften: Allgemeines
institution	findex.gbv.de
topic_facet	Archean Canada Carbonate Oxygenation Seawater
dewey-raw	550
isfreeaccess_bool	false
container_title	Precambrian research
authorswithroles_txt_mv	Riding, Robert @@aut@@ Liang, Liyuan @@aut@@ Fralick, Philip @@aut@@
publishDateDaySort_date	2022-01-01T00:00:00Z
hierarchy_top_id	306661411
dewey-sort	3550
id	ELV008902976
language_de	englisch
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author	Riding, Robert
spellingShingle	Riding, Robert ddc 550 bkl 38.00 misc Archean misc Canada misc Carbonate misc Oxygenation misc Seawater Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas
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topic_title	550 DE-600 38.00 bkl Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas Archean Canada Carbonate Oxygenation Seawater
topic	ddc 550 bkl 38.00 misc Archean misc Canada misc Carbonate misc Oxygenation misc Seawater
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title	Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas
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title_full	Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas
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title_sort	oxygen-induced chemocline precipitation between archean fe-rich and fe-poor carbonate seas
title_auth	Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas
abstract	The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms, ∼2.9–2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals suggest platform margin precipitation, both as seafloor crusts and in the water column, during mixing of anoxic offshore and oxygenated onshore water masses in dynamic chemoclines. Platform interiors were subject to short-lived influxes of Fe-rich anoxic offshore waters that variously precipitated aragonite, herringbone calcite, Fe-dolomite, and rare siderite. Overall, these observations are consistent with chemical equilibrium analysis assuming three co-existing confluent carbonate water masses: (i) offshore anoxic iron-rich seawater, precipitating Fe-carbonate, (ii) a chemocline mixing zone variously precipitating interlayered aragonite, calcite and Fe oxide, (iii) onshore iron-poor seawater precipitating calcite and aragonite in an ‘Oxygen Oasis’. In this system, Fe2+, at ∼ 3 orders of magnitude lower level, supersedes the effect of Mg2+ on Ca-carbonate mineralogy. Only when sufficient Fe2+ was removed by oxygenation did the relative concentrations of Mg2+ and Ca2+ determine CaCO3 mineralogy. Platform margin chemoclines created by oxygen production likely persisted throughout the Archean.
abstractGer	The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms, ∼2.9–2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals suggest platform margin precipitation, both as seafloor crusts and in the water column, during mixing of anoxic offshore and oxygenated onshore water masses in dynamic chemoclines. Platform interiors were subject to short-lived influxes of Fe-rich anoxic offshore waters that variously precipitated aragonite, herringbone calcite, Fe-dolomite, and rare siderite. Overall, these observations are consistent with chemical equilibrium analysis assuming three co-existing confluent carbonate water masses: (i) offshore anoxic iron-rich seawater, precipitating Fe-carbonate, (ii) a chemocline mixing zone variously precipitating interlayered aragonite, calcite and Fe oxide, (iii) onshore iron-poor seawater precipitating calcite and aragonite in an ‘Oxygen Oasis’. In this system, Fe2+, at ∼ 3 orders of magnitude lower level, supersedes the effect of Mg2+ on Ca-carbonate mineralogy. Only when sufficient Fe2+ was removed by oxygenation did the relative concentrations of Mg2+ and Ca2+ determine CaCO3 mineralogy. Platform margin chemoclines created by oxygen production likely persisted throughout the Archean.
abstract_unstemmed	The removal of dissolved iron by oxygen was a key control on marine Ca-carbonate precipitation during the Archean, but many details remain poorly resolved. We examined thick carbonate platforms, ∼2.9–2.8 Ga, in the western Superior Province of Canada. Interlayered Fe and Ca-carbonate minerals suggest platform margin precipitation, both as seafloor crusts and in the water column, during mixing of anoxic offshore and oxygenated onshore water masses in dynamic chemoclines. Platform interiors were subject to short-lived influxes of Fe-rich anoxic offshore waters that variously precipitated aragonite, herringbone calcite, Fe-dolomite, and rare siderite. Overall, these observations are consistent with chemical equilibrium analysis assuming three co-existing confluent carbonate water masses: (i) offshore anoxic iron-rich seawater, precipitating Fe-carbonate, (ii) a chemocline mixing zone variously precipitating interlayered aragonite, calcite and Fe oxide, (iii) onshore iron-poor seawater precipitating calcite and aragonite in an ‘Oxygen Oasis’. In this system, Fe2+, at ∼ 3 orders of magnitude lower level, supersedes the effect of Mg2+ on Ca-carbonate mineralogy. Only when sufficient Fe2+ was removed by oxygenation did the relative concentrations of Mg2+ and Ca2+ determine CaCO3 mineralogy. Platform margin chemoclines created by oxygen production likely persisted throughout the Archean.
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title_short	Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas
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doi_str	10.1016/j.precamres.2022.106902
up_date	2024-07-06T21:18:13.503Z
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Oxygen-induced chemocline precipitation between Archean Fe-rich and Fe-poor carbonate seas

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