Trace- and rare-earth element geochemistry and Pb–Pb dating of black shales and intercalated Ni–Mo–PGE–Au sulfide ores in Lower Cambrian strata, Yangtze Platform, South China

Jiang, Shao‐Yong; Yongquan, Chen; Ling, Hong‐Fei; Yang, Jin; Feng, Hong-Tao; Ni, Pei

doi:10.1007/s00126-006-0066-6

Cited by 133 publications

(58 citation statements)

References 49 publications

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“…Related to this condensation, a polymetallic enrichment layer occurs sporadically in the lower portion of this transgressive black shale along a NE-striking 1600 km belt, which can be used as a correlation marker Och et al, 2013;Zhu et al, 2003), but mineable ore layer is usually less than half meters in thickness and exposed only within Guizhou and Hunan provinces (Jiang et al, 2006(Jiang et al, , 2007. The deposit formed under sulfidic depositional conditions although the origin of the metal enrichment has proven controversial (Jiang et al, 2006;Lehmann et al, 2007;Steiner et al, 2007).…”

Section: Geological Settingmentioning

confidence: 98%

Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes

Wang

Struck

Guo

et al. 2015

Precambrian Research

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Section: Geological Settingmentioning

confidence: 98%

Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes

Wang

Struck

Guo

et al. 2015

Precambrian Research

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“…Although or ganic mat ter and sulphides are not ef fec tive con centra tors of REE, they may ac cu mu late more (M + H)REE than LREE (Jiang et al, 2006;Zanin et al, 2010). Lo cally en countered rocks of the Kupferschiefer se ries en riched in P 2 O 5 or con tain ing phos phate min er als (e.g., Kucha, 1982;Mayer and Piestrzyñski, 1986;Hartmann et al, 1997;Michalik, 2001;Saw³owicz, 2013) sug gest the pos si bil ity of REE lib er a tion from phos phates which are com monly en riched in MREE (e.g., Hannigan and Sholkovitz, 2001;Shields and Stille, 2001;Bouch et al, 2002).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…In the ma rine sed i men ta tion dom i nated by de po si tion of clay and or ganic mat ter, the dis tri bu tion of REE de pends primar ily on the com po si tion of terrigenous source ma te rial, biogenic ma te rial com po si tion, and re dox con di tions in bot tom wa ters (e.g., Piper, 1974;McLennan, 1989;Ger man et al, 1991;Jiang et al, 2006;Zanin et al, 2010). Mod ern sed i ments de pos ited un der re duc ing con di tions are char ac ter ized mostly by rel a tively flat REE pat terns, with a slight HREE en rich ment (de Baar et al, 1988;Piper and Bau, 2013).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…How ever, the ul timate REE dis tri bu tion in sed i ments is com monly gov erned by diagenetic pro cesses (Schieber, 1988;Milodowski and Zalasiewicz, 1991;Shields and Stille, 2001;Bouch et al, 2002) or in terac tion of sed i ments with mi grat ing flu ids, which tends to increase REE con tents and con cen trate pref er en tially the mid dle REE (de Baar et al, 1988;Gieré, 1996;Zwingmann et al, 1999;Wood, 2003). Be cause of this, REE dis tri bu tion di a grams for var i ous kinds of black shales can ex hibit high vari abil ity where met al lif er ous black shales are usu ally more strongly en riched in REE than typ i cal black shales (Ta ble 1; Huyck, 1989;Jiang et al, 2006).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…The REE de pos its as so ci ated with black shale are ex tremely rare (Gieré, 1996;Long et al, 2012;Jaireth et al, 2014;Simandl, 2014), ex cept ing a few polymetallic black shales (Weng et al, 2015), phosphorite-bear ing shales (e.g., Cruse et al, 2000), black slates (Loukola --Ruskeeniemi and Lahtinen, 2013) or shales with IOCG hy drother mal min er ali sa tion (Simandl, 2014). REE in sev eral other shale-re lated polymetallic de pos its oc cur as ac com pa ny ing com mod i ties (e.g., Jiang et al, 2006;Zanin et al, 2010), however, there is lit tle in for ma tion about eco nomic util ity.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

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Controls on the distribution of rare earth elements in the Kupferschiefer series of SW Poland

Oszczepalski¹,

Chmielewski²,

Mikulski³

2016

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1 Pol ish Geo log i cal In sti tute -Na tional Re search In sti tute, Rakowiecka 4, 00-975 Warszawa, Po land Oszczepalski, S., Chmielewski, A., Mikulski, S.Z., 2016. Con trols on the dis tri bu tion of rare earth el e ments in the Kupferschiefer se ries of SW Po land. Geo log i cal Quar terly, 60 (4): 811-826, doi: 10.7306/gq.1325 This study deals with the spa tial dis tri bu tion and the PAAS-nor mal ized pat terns of rare earth el e ments (REE) stud ied by ICP-MS in the Kupferschiefer se ries of SW Po land. The most char ac ter is tic fea ture is a pro gres sive en rich ment in REE content (in clud ing Y and Sc) out ward from the rocks with py ritic and Pb-Zn min er al isa tion, across the rocks with cop per min er alisa tion, to wards the ox i dized (Rote Fäule) ar eas. The same trend can also be ob served with re spect to LREE, MREE and HREE. Whereas REE dis tri bu tion di a grams for shales with py rite and Pb-Zn min er al isa tion are al most flat, di a grams for shales with he ma tite and cop per min er al isa tion are con vex-up ward and the stron gest con vex ity is at trib uted to the tran si tion from hematitic al ter ation to cop per-rich rocks. REE dis tri bu tion di a grams nor mal ized to PAAS show strong MREE en richment rel a tive to LREE and HREE, which is typ i cally the high est in the he ma tite zone, lower in shale with cop per min er al isation, and the low est in shales with Pb-Zn and py rite min er al isa tion. The sys tem atic in crease in the con cen tra tion of REE to wards the Rote Fäule, and the strong en rich ment in MREE in the tran si tion zone are in dic a tive of vari able in ten sity of leaching and for ma tion of the REE en rich ments (in clud ing MREE) by MREE>HREE>LREE flu ids, as ev i denced by the MREE-enriched sig na tures. Over print ing of sec ond ary en rich ments over the orig i nal REE pat tern due to re dis tri bu tion along the path ways of ex pand ing flu ids are pos tu lated to ac count for the ap par ent dif fer ences in the dis tri bu tion and con cen tra tion of REE (in clud ing the MREE-en riched trend) be tween the ox i dized rocks, cop per-bear ing rocks, and re duced lithologies bar ren in cop per.

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Marine redox stratification during the early Cambrian (ca. 529‐509 Ma) and its control on the development of organic‐rich shales in Yangtze Platform

Zhang

Jiang

et al. 2017

Geochem Geophys Geosyst

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High resolution geochemical data from nine sections representing shelf to basinal environments in the Yangtze Platform were analyzed to reconstruct the marine redox environment during early Cambrian. Based on Fe species and Mo/TOC ratios, we have supplemented marine redox stratification during Stage 4 (late Canglangpuian‐Longwangmiaoan, ∼514‐509 Ma) on basis of the previously studied Stage 2‐Stage 3 (Meishucunian‐Qiongzhusian, ∼529‐514 Ma). A new proposed marine stratified redox model indicates that the middepth “euxinic wedge” developed at the base of slope during ∼514‐509 Ma in contrast to that the “euxinic wedge” prevailed at the shelf margin during ∼529‐514 Ma, even though these middepth euxinic waters both occurred between the oxic surface waters and ferruginous deep waters. This marine redox stratification resulted in high production and good preservation of organic matter during early Cambrian. TOC values in euxinic waters in the middle are generally higher than in ferruginous waters due to upwelling in slope. Therefore, the lower Cambrian organic‐rich shales in the Yangtze Platform are inferred to be deposited under the anoxic‐ferruginous and euxinic bottom waters with moderate‐strong restriction.

show abstract

Trace- and rare-earth element geochemistry and Pb–Pb dating of black shales and intercalated Ni–Mo–PGE–Au sulfide ores in Lower Cambrian strata, Yangtze Platform, South China

Cited by 133 publications

References 49 publications

Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes

Marine redox variations and nitrogen cycle of the early Cambrian southern margin of the Yangtze Platform, South China: Evidence from nitrogen and organic carbon isotopes

Controls on the distribution of rare earth elements in the Kupferschiefer series of SW Poland

Marine redox stratification during the early Cambrian (ca. 529‐509 Ma) and its control on the development of organic‐rich shales in Yangtze Platform

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