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2012-4-17Geochemical control on the abundance of vanadium in black shales and related rocks, by George N. Breit, Richard B. Wanty, and Michele L. Tuttle 6 Nickel-molybdenum-platinum-gold deposits in black shales of southern China-A new ore type with possible analogs in Pennsylvanian rocks of the U.S.A., by Raymond M. Coveney, Jr., and Chen ansheng 9
Abstract Orogenic gold deposits localized in carbonaceous sedimentary black-shale complexes are major contributors to worldwide balance of gold extracted from the crust, though there is a limited consensus about the role of host sedimentary rocks, involvement of external i.e., magma-derived fluids and brittle deformations into ore ...
The trace element geochemistry of marine black shales has been successfully used to interpret sediment provenance and deep ocean conditions during sedimentation. More recently, it has been proposed that certain pyritic black shales may act as sources of gold and arsenic for orogenic gold deposits. Four aspects of the geochemistry of the Phanerozoic black shales from the central gold beltEast ...
This work presents brief descriptions of the geological structures of new gold-ore occurrences Osipovskoe, Larinskoe, Amurskoe, Chernoozerskoe, and Otnurok in carbonaceous deposits of the Southern Urals. It is shown that these occurrences are localized in intensively dislocated, silicified, and sulfidized rocks and are intruded by numerous dykes of various compositions.
The way of extraction of insoluble carbonaceous substance ICS from black shales and technique of determination of noble metals NM in it by direct arc atomic emission analysis AEA were developed.
First Findings of Palladium-Gold-REE Ore Mineralization in Precambrian Carbonaceous Shales on the Western Slope of the Southern Urals Article PDF Available in Doklady Earth Sciences 4331866 ...
These processes produce regionally extensive black shale and turbidite sequences enriched in syngenetic gold and arsenic, commonly from 5 to 100 ppb Au and 10 to 200 ppm As. Rare organic- and sulfide-rich metalliferous black shales may contain up to 1 to 2 ppm Au and over 1,000 ppm As, present as refractory gold in arsenian pyrite and ...
2009-3-23rich enough in metals to constitute an ore deposit. Oth- er metal-rich black shales may eventually serve as metal sources whenever normal sources are depleted Davidson and Lakin, 1961, 1962 Vine and Tourtelot, 1970. Metals concentrated syngenetically in a black shale
2019-3-1B. Sukhoi Log, Lena gold district Wood and Popov, 2006. Pyritic gold ore is concentrated in an overturned anticline in carbonaceous shales and siltstones. C. Bendigo, central Victoria Willman, 2007. D. Dufferin deposit, Meguma district Ryan and Smith, 1998. Gold ores occur in quartz-rich saddle reefs and associated crosscutting quartz veins.
2015-1-16A Carbonaceous Sedimentary Source-Rock Model for Carlin-Type and Orogenic Gold Deposits - A Carbo... VIP VIP 100w VIP ...
2020-4-9The geochemical data for the Dalradian carbonaceous shales show that they are a viable protolith for Dalradian-hosted gold-tellurium mineralisation. In particular Trace element concentrations, including Au and Te, in early-stage pyrite show that ore metal concentration began in the organic-rich sediments of the depositional environment.
The black shales display a positive relationship between Al2O3 and the trace elements Ni, Cu, Zn, As, Sb and the organic carbon content is low 0.5 wt . The gold content in the shales ranges from 40 to 62 ppb 51 ppb and correlates weakly with V supporting a possible control of organic processes during deposition of gold in the sediments.
These shales are the hosts to epigenetie, stratiform quartz- carbonate-gold sulfide mineralization in the Sabie-Pilgrims Rest gold field e.g., Zietsman, 1967. The distribution, min- eralogical siting, and origin of gold and other transition metals in the Transvaal black shales are, therefore, of particular in- terest and relevance to ore ...
Black shales 0.3 m below samples 4, 5, Table 3 and 0.4 m above the sulfide ore bed samples 912, Table 3 also display significantly higher concentrations of Mo 21fold, Ni 12fold, As 5fold, Sb and Zn 3fold, Co, Cu and P 2 O 5 2fold than the average Cambrian black shale. Conversely, V and Mn values are comparable ...
Black shales of the late Neoproterozoic Gwna Group 570580 Ma, UK, contain enrichments of tellurium Te, selenium Se and cobalt Co relative to average shale compositions. The Te and Co enrichments bear comparison with those of ferromanganese crusts in the modern deep ocean.
2020-7-19Carbonaceous material CM was reported to be found in many metasediment-hosted orogenic gold deposits, such as the Macraes deposit in New Zealand 1, Cosmo Howley in Australia 2, and ... ore veins are located near CM, and the gold grade in individual veins is strongly affected by amount of CM 11,12. However, the CM in the Bumo deposit has ...
2020-8-10Carbonaceous material CM is common in meta-sediments and is generally interpreted to be intimately associated with gold mineralization. For the Bumo deposit in Hainan Province, South China, CM is mainly hosted by greenschist faciesto amphibolite-facies metamophic rocks of the Paleoto the Mesoproterozoic Baoban Group, and by auriferous veins which could be used as an important gold ...
Petrographic, geochemical, and stable isotope C, O, S investigations into the origin and nature of the carbonaceous mattermainly amorphous bitumens and pyrobitumen of organic origin, with biological fragments and rare graphite of both detrital and metamorphic origindemonstrate that black shales within the Cambro-Ordovician succession in ...
Shale Shale breaks into thin pieces with sharp edges. It occurs in a wide range of colors that include red, brown, green, gray, and black. It is the most common sedimentary rock and is found in sedimentary basins worldwide.
This paper presents evidence and arguments that carbonaceous sedimentary rocks were a source for Au and As in sediment-hosted orogenic and Carlin-type gold deposits and develops a corresponding genetic model. In this two-stage basin-scale model, gold and arsenic are introduced early into black shale and turbidite basins during sedimentation and diagenesis stage 1 and concentrated to ore ...
Bitumens from carbonaceous shales of various ages of the Baikal-Patom highlands and the Degdekan deposit Yana-Kolyma folded system were considered. It was determined that bitumens of the Bodaibo synclinorium are mainly represented by asphaltenes, asphaltogenic acids, and hydrocarbons bitumens of the Degdekan field are represented predominantly by hydrocarbons. P
2018-5-2Gold was measured, as pyrite in carbonaceous shales is considered to be an important source of orogenic gold deposits Tomkins, 2013. View in article It is argued that the increase in atmospheric oxygenation following the Neoproterozoic glaciations was responsible for increased orogenic gold deposition Tomkins, 2013.
2019-4-9Indicator carbonaceous phyllitegraphitic schist in the Archean Kundarkocha gold deposit, Singhbhum orogenic belt, eastern India Implications for gold mineralization vis-a-vis organic matter P R Sahoo andA S Venkatesh Department of Applied Geology, Indian School of Mines, Dhanbad 826 004, Jharkhand, India.
2015-11-30arsenopyrite in carbonaceous shales. This alteration domain can contain 0.5ppm to 1ppm gold. Forms a significant proportion of oxidised heap leach ore. Arsenopyrite scorodite FeAsO 4.2H 2O hydrated iron oxides gold released and is amenable to cyanide leaching. Wallrock AlterationWallrock Alteration
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