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Academic literature on the topic 'Schists'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 July 2024

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Journal articles on the topic "Schists"

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Puffer, John H., John R. McGann, and James O. Brown. "The Manhattan Schist, New York City: Proposed Sedimentary Protolith, Age, Boundaries, and Metamorphic History." Geosciences 14, no. 7 (July 15, 2024): 190. http://dx.doi.org/10.3390/geosciences14070190.

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There are some persistent basic questions pertaining to the bedrock schist of New York City (NYC). How many mappable schist formations are exposed in NYC, and what was the sedimentary protolith of the Manhattan schists? Our proposed answers are based in part on a blending of published paleontological and radiometric dating results that constrain the timing of Taconic subduction and the best choice of a pelitic protolith for the schists of NYC. We have chemically analyzed some samples of schist and shales at key locations to evaluate the plausibility of our proposals. The compelling published evidence indicates that the Taconic Orogeny began about 475 Ma, when peri-Laurentian plates began the process of east-dipping subduction under the Moretown Terrane, resulting in a magmatic flareup of the Shelburne Falls arc that carried the Moretown Terrane west across NYC. East-dipping subduction accounts for early Ordovician metamorphism until an oceanic slab break-off event at about 466 Ma. Our review of the biostratigraphic data indicates a continuation of subduction and the deposition of pelitic sediments until about 455 Ma, during the transition to deep-water turbiditic sediment deposition. This disqualifies all post-455 Ma turbidites as viable protoliths for the NYC Manhattan schists but does include the Late Cambrian to lowermost Late Ordovician pelites of the Jutland Sequence that are exposed directly west of NYC in New Jersey. Our new chemical analyses of Jutland sediments and each of the three named schists from the NYC plot as a single geochemical population. We, therefore, propose that the schists of NYC could collectively be referred to as the Manhattan schist of the Late Cambrian to lower Late Ordovician.
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Obioha, Young Ezenwa. "Geochemistry evolution of Schists of northwest Obudu area southeastern Nigeria." Global Journal of Geological Sciences 19, no. 1 (July 13, 2021): 29–39. http://dx.doi.org/10.4314/gjgs.v19i1.3.

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Geochemistry of schists of Obudu area was carried out using ICP-MS and ICP-ES techniques in order to determine the geochemical evolution of the area. 40 samples were analyzed for their major, trace and REE composition. Field mapping revealed that gneisses, amphibolites and schists comprising migmatitic schists (MS), quartz-mica schists (QMS), garnet-mica schists (GMS), and hornblende biotite schists (HBS), intruded by granites, granodiorites, quartzofeldspathic rocks and dolerites occur in the area. Structural studies revealed that the schists trend approximately NE–SW (5 – 30o ) indicating the Pan-African event. Modal analysis revealed that the schists have average concentration of quartz (15vol.%), plagioclase (An45-19 vol.%), biotite (15vol.%), garnet (9.0vol.%) and muscovite (6vol.%), the remaining consists of accessory minerals. Geochemistry showed that all the schists have molecular Al2O3 > CaO+K2O+Na2O, indicating they are peraluminous metasedimentary pelites. Trace and REE element results show that all the analyzed schist samples are depleted in Hg, Ag, Be, Bi, and Sb below < 1.0ppm, but relatively enriched in Ba, Sr and Zr with average concentration of 996, 675.73, 243.13 ppm respective. The HREE are depleted with ΣHREE < 10.2, but the LREE are relatively enriched with ΣLREE > 289.54. The ΣLREE/ΣHREE ratio ranges from 9.17 to 33.4, with a large positive delta V at Eu. These findings indicate that the schists of Northwest Obudu area are highly fractionated and had attained at least the uppermost amphibolite metamorphic grade. The schists had contributed to the development of the Pan-African continent.
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Esteban, J. J., J. Cuevas, and J. M. Tubía. "Geochemistry and origin of zircon in chlorite schists of the Ronda peridotites (Betic Cordilleras, southern Spain)." Lithosphere 11, no. 6 (November 4, 2019): 855–67. http://dx.doi.org/10.1130/l1088.1.

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Abstract This work deals with scarce chlorite schists scattered through the Ronda peridotites (Betic Cordilleras, Spain). These schists have unusually high zircon contents, which contrast with the usual lack of this mineral in ultramafic rocks. From field data and detailed petrographic, geochemical, and geothermometric studies, we focused on the origin of the zircon, a relevant issue for the interpretation of geochronological results. The chlorite schists appear as concordant sheets with granite dikes and as blackwall zones between dikes and serpentinized peridotites. As the intrusion age of the dikes and chlorite schist zircon crystallization (ca. 22 Ma) is slightly older than the age of serpentinization and related chlorite schist formation (ca. 19 Ma), we propose that the chlorite schists are tied to the intrusion of the granite dikes and the subsequent serpentinization of peridotites. Trace and rare earth elements alone are not indicative of the magmatic or hydrothermal origin of the zircon, but the combination of information about zircon morphology, melt inclusions, geothermometry, and the structural relationships between granite dikes and chlorite schists points to late magmatic melts for the zircon origin. We suggest that high-temperature melts saturated in F and Cl acted as Zr carriers under low-pH conditions. A change of the pH conditions, due to hydrothermal alkaline fluids incoming for the concomitant peridotite serpentinization, would have led to zircon crystallization and concentration at the apical zones of the dikes, and to rodingitization before the extensive observed chloritization.
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Kadir, S., and A. Akbulut. "Mineralogy, geochemistry and genesis of the Taşoluk kaolinite deposits in pre-Early Cambrian metamorphites and Neogene volcanites of Afyonkarahisar, Turkey." Clay Minerals 44, no. 1 (March 2009): 89–112. http://dx.doi.org/10.1180/claymin.2009.044.1.89.

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AbstractThe Taşoluk kaolinite deposits of Afyonkarahisar (western Anatolia) are hosted by both pre-Early Cambrian sericitic mica-chlorite schists and Neogene volcanites, the latter comprising tuffs and agglomerates. These units have been affected by hydrothermal alteration controlled by faults resulting in complex, irregular, lateral mineralogical zonation. The occurrence of a siliceous cap on altered schists and in claystone, of quartz veins in schists and tuffs, and the development of explosion cones and pit fillings indicate that alteration in both the schists and the volcanites is due to hydrothermal processes. Altered schists have generally large (locally small) Fe contents, and claystones are generally silicified and have small Fe contents. Kaolinite predominates south and west of Taşoluk, whereas high (Fe+Ti)-bearing illite + kaolinite predominate in other altered sections. The kaolinite exhibits a stacked micromorphology within altered schists, and the altered volcanites record in situ precipitation, derived from a mechanism of paired dissolution and precipitation. Illite fibres coexist with kaolinite, smectite, chlorite, mica and sericitized feldspar in markedly altered schists, revealing that the illite formed either authigenically or by conversion of smectite to illite. A relative increase in Cr+Ni and decrease in Sr+Ba in the kaolinite deposits and their schistose host rock relative to the upper level of the kaolinite deposits and their volcanic parent rocks came about by the alteration of chlorite, mica and feldspar in the sericitic mica-chlorite schists, and feldspar, glass shards and schist fragments in the volcanites as a result of extensive faulting, fracturing and hydrothermal activity during Late Miocene-Pliocene volcanism, which contributed to the development of kaolinite deposits under acidic environmental conditions. With regard to industrial applications, the low-Fe kaolinized schists are suitable for use in refractories and paper coatings, while the claystone is suitable for use in ceramics and in the white-cement industry.
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Khedr, Mohamed Zaki, Gehad M. Saleh, Khaled M. Abdelfadil, Eiichi Takazawa, Kamal Abdelrahman, Akihiro Tamura, and Shaimaa Ali El-Shafei. "The Geology and Mineral Chemistry of Beryl Mineralization, South Eastern Desert, Egypt: A Deeper Insight into Genesis and Distribution." Minerals 14, no. 5 (April 28, 2024): 465. http://dx.doi.org/10.3390/min14050465.

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Beryl mineralization in the Nugrus-Sikait domain in the South Eastern Desert (SED) of Egypt occurs as disseminated crystals in granitic pegmatite and quartz, as well as pegmatite veins crosscutting mélange schist and ophiolitic rocks. When granitic pegmatite comes into contact with the ophiolitic rocks, phlogopite and amphibole schists are formed due to K metasomatism. The ophiolitic mélange is intruded by leucogranite and related pegmatite along the NNW to NW Nugrus shear zone. Beryl samples have been collected from Um Sleimat, Madinat Nugrus, Wadi Abu Rusheid, and Wadi Sikait. Major oxides and in situ trace and rare earth elements (REEs) of beryl and associated minerals were analyzed through EPMA and LA-ICP-MS, respectively. The investigated beryl, based on its color and chemical compositions, can be classified into the two following types: pegmatitic beryl (type I) and schist-related beryl (type II). The former is colorless to pale green, and is mainly restricted in pegmatite veins; it is poor in Cr2O3 (up to 0.03 wt%) and MgO (Nil). The latter, deep green in color, is rich in Cr2O3 (up to 0.27 wt%) and MgO (up to 2.71 wt%), and occurs within quartz veins, phlogopite schists, and tremolite schists. The abundant beryl mineralization in phlogopite schists and their related quartz veins suggests that granite and associated pegmatite are the source rocks for the Be-bearing fluids that migrate along the NW-SE trending deep-seated tectonic zone, such as the Nugrus shear zone. Therefore, the formation of beryl in schists is attributed to the interaction of granitic/pegmatitic-derived Be-bearing fluids with serpentinite and gabbro interlayered with mélange schists. Variations in the trace and REE contents of both beryl types (I and II) indicate their two-stage formation from different compositions of Be-rich fluids, where light REEs, Zr, Nb, Ba, and Th decrease from type I beryl to type II. These two phases of beryl could be attributed to the magmatic/hydrothermal fluids associated with the pegmatite emplacement. The early phase of the late-stage magmatic-derived fluids was closely related to magma evolution and pegmatite formation, forming euhedral type I beryl. The late phase of pegmatite-derived fluids was mixed with serpentinite/schist-derived fluids that cause high V and Cr content in type II beryl. The composition of parent magmas of felsic rocks, the high degree of magma fractionation or the late stage melts, fluid compositions (rich in Be, Li, Cs, Rb, K), and alkali metasomatism, as well as the linear NW-SE trending deep-seated shear zone, are all factors possibly influencing beryl mineralization in the SED of Egypt.
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Na, Fuchao, Weimin Song, Yingcai Liu, Junyu Fu, Yan Wang, and Wei Sun. "Geochemistry, Chronology and Tectonic Implications of the Hadayang Schists in the Northern Great Xing’an Range, Northeast China." Minerals 13, no. 11 (October 28, 2023): 1379. http://dx.doi.org/10.3390/min13111379.

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The Late Paleozoic tectonic evolution of the Xing’an block in the eastern Central Asian orogenic belt has long been the subject of debate. In this paper, a comprehensive study of U-Pb zircon ages, Lu-Hf isotopes and whole-rock elemental analyses was carried out on Hadayang schists. Representative samples of the epidote-biotite-albite schist and biotite-albite schist yielded the weighted mean 206Pb/238U ages of 360 ± 2 Ma and 355 ± 3 Ma, respectively. This indicated the presence of Late Devonian–Early Carboniferous intermediate-basic rocks in the eastern Xing’an block. The Hadayang schists exhibited a Na-rich, tholeiitic and calc-alkaline affinity in composition with low Mg# (35.2–53.0), Cr (23.7–86.5 ppm), Ni (21.1–40.0 ppm) and Co (12.1–30.6 ppm). They were characterized by enrichment of LILEs, depletion of HFSEs and highly positive zircon εHf(t) values (the average values were +8.93 and +9.29, respectively). The magma source of the Hadayang schists was a mantle that consisted of both spinel and garnet lherzolite, with a partial melting degree of 1%–5%, and it had undergone fractional crystallization of olivine, orthopyroxene and plagioclase. The Hadayang schists, together with other Late Devonian–Early Carboniferous intermediate-basic magmatic rocks in the eastern Xing’an block, were formed in an intracontinental extension tectonic setting similar to that of the North American Basin and Range basalt. Moreover, Late Devonian–Early Carboniferous ophiolite under a similar tectonic background in the western Xing’an block has been reported. We believe that the Xing’an block would have been in the stage of intracontinental extension during the Late Devonian–Early Carboniferous.
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Nurdiana, Astin, Atsushi Okamoto, Masaoki Uno, and Noriyoshi Tsuchiya. "Development of Open Transport of Aqueous Fluid from Pegmatite Revealed by Trace Elements in Garnet." Geofluids 2022 (October 15, 2022): 1–21. http://dx.doi.org/10.1155/2022/8786250.

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We investigated the fluid flow and elemental transport from a granitic body to the middle crust by determining the trace element compositions of garnet in pegmatites related to a quartz diorite intrusion and metamorphic rocks on Kinkasan Island, northeast Japan. Garnet in the pegmatites and biotite schists is characterized by spessartine– (Sps–) almandine- (Alm-) rich compositions of Sps14–69Alm22–70Prp2–14Grs1–13 and Sps16–30Alm54–66Prp9–16Grs3–6, respectively. A garnetite pod in the metamorphic unit has grossular- (Grs-) rich compositions (Sps1–4Alm8–11Prp0.1–0.4Grs80–87Adr3–4). The peak temperature ( T ) and pressure ( P ) conditions of the biotite schist during contact metamorphism were 600–650°C and 0.27–0.41 GPa, respectively. The primary fluid inclusions in quartz crystals within the pegmatites hosted by the quartz diorite and hosted by the metamorphic rocks have a wide range of homogenization temperatures (200–380°C). These correspond to the trapping temperature of 500–700°C, assuming a salinity of 4 wt.% NaClequivalent at pressure of the crystallization of the quartz diorite. Chondrite-normalized rare earth element (REE) patterns of garnets in the pegmatites in the quartz diorite and metamorphic unit are generally characterized by enrichment of heavy REEs and negative Eu anomalies with the REE contents in the schists which are systematically lower than in the pegmatites. However, garnet in the biotite schists close to the pegmatites has similar REE contents to garnet in the adjacent pegmatites. These geochemical features suggest that garnet in the biotite schists grew in response to fluid infiltration from the pegmatites. Besides, the Grs-rich garnet in the garnetite pod and its host quartz schist have flat heavy REE patterns and no Eu anomalies, which probably reflect a metasomatic process related to plagioclase replacement that produced Ca-Al-rich fluids. Our results suggest that the infiltration of pegmatitic fluids enhances elemental transport and metamorphic reactions in the middle crust.
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Han, Zhi Qiang, Jian Liu, Kang Bian, and Quan Chen. "Research on Geological Characteristics and Deformation Law of Surrounding Rock of a Tunnel with Carbonaceous Schist in Northwest Hubei Province." Applied Mechanics and Materials 256-259 (December 2012): 471–76. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.471.

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Northwest Hubei province is located in Mount Wudang metamorphic zone, where the geological conditions are very complex. The carbonaceous schist is relatively rare in this area, however, compared with other schists, it has some quite special characteristics. This paper focuses on lithologic features, physical and mechanical characteristics of carbonaceous schist, and Huashigou tunnel is researched as the engineering background. Analysis of carbonaceous schist shows that it has typical rheological, anisotropic and water-sensitive properties. Through a large number of monitoring measurement data analysis, deformation law of carbonaceous schist are summarized.
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Rai, Santa Man. "Geology along the Arniko Highway between Barabise and Kodari (China-Nepal Boarder) area, central Himalaya." Journal of Nepal Geological Society 42 (September 24, 2011): 41–50. http://dx.doi.org/10.3126/jngs.v42i0.31447.

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The area between Barabise and Kodari in central Nepal along the Arniko Highway is geologically located into Higher Himalayan Crystallines (HHC) and Lesser Himalayan Sequence (LHS) that is separated by the Main Central Thrust (MCT). The HHC consists of amphibolite facies rocks (pelitic schist, psamitic schist, pelitic gneiss and quartzite), while LHS is comprised by green schist to amphibolite facies rocks (phyllite, calcareous phyllite, garnet-mica schist, black schist, quartzite and augen gneiss) in uppermost section and carbonate (dolomite and limestone) with phyllite, and metasandstone in lower section. The MCT in the area is oriented in E-W direction with about 30° dip due north and S-C structure preserved in augen gneiss of LHS characterizes the top-to-south sense of shearing, which could be related to the movement along the MCT. Mineral lineation marked by stretched mica indicates N to NNE direction in both HHC and LHS. Metamorphism of inverse grade from biotite at stratigraphically lower most section of Kuncha Formation to garnet at the uppermost section having schist and augen gneiss is obvious close to the MCT in the section. However, the Kuncha Formation contains tiny crystals of garnet in the rocks of greenschist facies. Kyanite and sillimanite isograds are developed in pelitic and psamitic schists, and pelitic schists appeared at the basal part of HHC above the MCT. The transformation of garnet to chlorite at the margin and fractures and formation of chlorite within bulk rocks of the MCT zone and HHC are the indicators of traces of retrograde metamorphism because of dropping in pressure-temperature probably related to post deformation event.
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Carvalho, Cristina, Sílvia Aires, Fernando Noronha, António Casal Moura, and João Farinha Ramos. ""Schist" from Trás-os-Montes and Alto Douro (NE of Portugal): Potential Use as Natural Stone." Key Engineering Materials 548 (April 2013): 205–11. http://dx.doi.org/10.4028/www.scientific.net/kem.548.205.

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The main purpose of this work was to increase the knowledge about the geological resources of Trás-os-Montes and Alto Douro region (TMAD), particularly about their “schists” (slate, phyllite and schist), due to the economic and social effects that their mining and processing can have, not only on the local economy, but also on a national level. This work presents the results of the study conducted on “schists” from TMAD, aiming for their use as natural stone. Special emphasis is given on the results obtained from the following physical and mechanical tests: compressive strength, flexural strength, apparent density, open porosity, water absorption, abrasion resistance and resistance to ageing by thermal shock. These tests were determinant to define the most suitable applications for each schistose stone that was studied, taking into account the existing groups of natural stone products. For defining the recommended applications for each “schist”, European standards for natural stone products were considered, as well as technical specifications that exist in some European countries, which were the basis for the establishment of a proposal of technical specifications for Portugal, already published by one of the authors of this work.
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Dissertations / Theses on the topic "Schists"

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Potvin, Robin. "Étude volcanologique du centre volcanique felsique du lac des Vents, région de Chibougamau /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1991. http://theses.uqac.ca.

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Corona, Juan Carlos. "An experimental investigation of the reaction glaucophane + 2 quartz = 2 albite + talc /." Diss., Online access via UMI:, 2005.

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Dowe, David S. "Deformational History of the Granjeno Schist Near Ciudad Victoria, Mexico." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1089910191.

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Haney, Erin Marie. "Pressure-temperature evolution of metapelites within the Anaconda metamorphic core complex, southwestern Montana." CONNECT TO THIS TITLE ONLINE, 2008. http://etd.lib.umt.edu/theses/available/etd-07252008-111800/.

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Lecomte, Andreï. "Relations spatiales et génétiques entre uranium, sulfures et matières organiques : application aux shales et schistes noirs." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0019.

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Dans de nombreux gisements métalliques, notamment en contexte sédimentaire et en particulier dans le cas des shales noirs, des relations spatiales voire génétiques sont décrites entre la matière organique et les métaux. Une série de shales/schistes noirs affectés par des conditions thermo barométriques croissantes a été sélectionnée afin d'étudier le comportement et le devenir de l'uranium de la sédimentation au métamorphisme. Dans les Alum Shales cambro ordoviciens (Suède) faiblement enfouis, l'uranium reste dispersé et n'apparaît sous aucune forme minéralogique identifiable. Le passage des Alum Shales dans la fenêtre pétrolière et la génération d'hydrocarbures n'a pas provoqué de remobilisation identifiable de la concentration primaire, les hydrocarbures migrés ne transportant pas l'uranium. En revanche, le métamorphisme de faciès schiste vert associé à l'orogénèse calédonienne a entraîné une réexpression de la minéralisation uranifère sous la forme d'uraninite, d'urano titanates et/ou de phospho silicates à U, Ti, Zr, Y. Dans le cas des schistes noirs paléoprotérozoïques de Talvivaara (Finlande), le métamorphisme de faciès amphibolite a provoqué la remobilisation de l'uranium synsédimentaire et la cristallisation synmétamorphique, pendant l'orogénèse svécofennienne à 1880 1870 Ma, de cristaux d'uraninite fréquemment inclus dans des nodules carbonés. Cette étude montre que l'uranium, préconcentré au moment de la sédimentation, reste immobile pendant les premiers stades d'enfouissement mais est remobilisé dans les conditions P T croissantes et cristallise sous forme d'oxydes d'uranium pouvant évoluer vers des (phospho-)silicates d'uranium
In many metallic deposits, especially in sedimentary context and particularly in black shales, spatial or genetic relationships are described between organic matter and metals. Several black shales/schists affected by increasing thermo barometric conditions were selected to study the behavior and fate of uranium from sedimentation to high grade metamorphism. In shallow buried cambro ordovician Alum Shales (Sweden), uranium is dispersed and is not detectable as a particular mineralogical expression. Thermal maturation of the Alum Shales and hydrocarbon generation did not cause any identifiable remobilization of primary concentration, since migrated hydrocarbons did not carry uranium. In contrast, greenschist facies metamorphism associated with the Caledonian orogeny resulted in a re expression of uranium mineralization as uraninite or urano titanate crystals, which may evolve into U Ti Zr Y phospho silicates. In the case of Talvivaara, amphibolite facies metamorphism caused remobilization of synsedimentary uranium and synmetamorphic crystallization, during Svecofennian orogeny at 1880 1870 Ma, of uraninite crystals that are frequently included in carbonaceous nodules. This study shows that uranium, which is preconcentrated during sedimentation, remains immobile in the early stages of burial but is remobilized with increasing PT conditions and crystallizes as uranium oxides and/or uranium (phospho-)silicates
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Pitcairn, Iain Kerr. "Sources of fluids and metals in orogenic gold deposits : the Otago Schists, New Zealand." Thesis, University of Southampton, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431201.

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MacKenzie, Douglas James, and n/a. "Structural controls on orogenic gold mineralisation in the Otago Schist, New Zealand and the Klondike Schist, Canada." University of Otago. Department of Geology, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080704.085108.

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Orogenic gold mineralisation in schist terranes with few or no contemporaneous igneous intrusions is poorly understood. It is proposed in this thesis that the structural evolution of such terranes controls the generation of hydrothermal fluid pathways and thus the location of orogenic mineral deposits. Gold mineralisation in the Otago Schist, New Zealand and the Klondike Schist, Canada occurred in the latter phases of greenschist facies metamorphism as well as after metamorphism during Paleozoic-Mesozoic exhumation. In Otago, gold mineralisation occurred at a number of different times and structural levels as the schist belt was exhumed and rocks were brought up through the brittle-ductile transition. In Klondike Schist, gold mineralisation occurred in relatively brittle rocks after a period of regional compression and crustal shortening caused by the stacking of thrust sheets. Gold mineralisation in both schist belts is not associated with any coeval igneous activity. The earliest stage of gold mineralisation in the Otago Schist occurred in the Jurassic when mineralising fluids were progressively focussed into late metamorphic ductile shear zones such as the Hyde-Macraes Shear Zone (HMSZ), east Otago and Rise and Shine Shear Zone (RSSZ), central Otago. Both of these gold-bearing mineralised zones occur along mappable structural discontinuities or boundaries that separate structurally, metamorphically and lithologically distinct blocks. The HMSZ occurs in the hangingwall of an underlying low angle normal fault that juxtaposes mineralised lower greenschist facies rocks on to unmineralised upper greenschist facies rock. The RSSZ occurs in the footwall of an overlying low angle normal fault that juxtaposes unmineralised lower greenschist facies rocks on to mineralised upper greenschist facies rock. The two shear zones did not form as part of a single homogeneous structure. There are several other prospective late metamorphic boundaries that are different from later brittle faults that disrupt the schist. Late metamorphic gold mineralisation is characterised by both ductile and brittle structures, foliation-parallel shears, disseminated gold with sulphides in deformed schist and minor steeply dipping extensional veins. This style of mineralisation is the most prospective but can be subtle in areas without quartz veins. Hydrothermally altered rocks are enriched in gold, arsenic, tungsten and sulphur with minor enrichment of bismuth, antimony, mercury and molybdenum. Disseminated mineralisation in the HMSZ is associated with hydrothermal graphite however there is no hydrothermal graphite in the RSSZ. The next stage of gold mineralisation occurred in the Cretaceous during post-metamorphic exhumation of the schist belt and is characterised by steeply dipping, fault-controlled quartz veins, silicified breccias and negligible wall rock alteration. Most post-metamorphic veins strike northwest such as the ~25 km long Taieri river gold vein swarm, but there are other stibnite and gold mineralised structures that strike northeast (e.g., Manuherikia Fault system) and east-west (e.g., Old Man Range vein systems). The latest recognised stage of gold mineralisation is controlled by structures related to the initiation of the Alpine Fault in the Miocene and is characterised by steeply dipping quartz veins with abundant ankeritic carbonate in veins and ankeritic carbonate with gold in altered rocks. Hydrothermally altered rocks are enriched in arsenic, carbon dioxide and sulphur with minor enrichment of antimony. Gold-bearing veins at Bullendale, central Otago are of this type and are associated with a broad alteration zone. Gold-silver and gold-silver-mercury alloys occur in both Caples and Torlesse Terranes of the Otago Schist. Almost all mercury-bearing gold occurs in east Otago vein systems and mercury-free gold occurs in central and northwest Otago veins, irrespective of host terrane. There is no relationship between depth of vein emplacement and mercury content of gold. The Klondike Schist was emplaced as a series of stacked thrust slices in the Jurassic and thrust-related fabrics are preserved in all thrust slices. Strongly deformed carbonaceous schist horizons are spatially associated with thrust faults and graphite within these units is concentrated along spaced cleavage surfaces. Kink folding is best developed in the uppermost slices of Klondike Schist and overprints thrust-related fabrics. Gold-bearing veins formed in extension fractures controlled principally by pre-existing weaknesses such as kink fold axial surfaces. Normal faults correlated with a period of Late Cretaceous regional extension crosscut kink folds and offset gold mineralised veins. The main stage of mineralisation occurred after major regional compression and thrust stacking and before Cretaceous normal faulting. Gold-bearing veins are widely dispersed throughout the uppermost slices of Klondike Schist and are considered to be a sufficient source for Klondike gold placer deposits. Disseminated gold with pyrite is associated with gold-bearing veins in some Klondike Schist and this disseminated mineralisation expands the exploration target for these veins. Disseminated gold with pyrite, without quartz veins, occurs in some schist lithologies and is associated with chlorite alteration and weak silicification. The arsenic content of gold-mineralised Klondike Schist is much lower than mineralised Otago Schist and background concentrations of arsenic are much lower in Klondike Schist as well. No shear-related mineralisation has been discovered in Klondike Schist but due to its relatively poor exposure, this belt remains prospective for this style of mineralisation.
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Gardiner, Nicholas John. "The development of an in-situ UV ablation GC-IRMS technique for the analysis of oxygen isotopes in metamorphic minerals, and its application to polymetamorphic schists from Western Massachusetts, U.S.A." Thesis, University of Oxford, 2000. http://ora.ox.ac.uk/objects/uuid:52f5141b-cf55-4394-b5b8-b3527786b246.

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This thesis describes an attempt to develop a pioneering method for the analysis of oxygen isotopes in metamorphic rocks. This technique is then applied to a suite of metapelites from Massachusetts, U.S.A. with the aim of investigating metamorphic history. The study of oxygen isotopes is a rapid and efficient way of deciphering the reaction history of a metamorphic rock, and they are particularly useful for quantifying the role of fluids during metamorphism. Technological advances have given the opportunity to develop a new laser fluorination facility capable of in-situ oxygen isotope analysis on the 100μm scale. The use of UV laser ablation coupled with helium carrier flow and isotope ratio mass spectrometry gives the potential for liberation, transfer and analysis of nanomoles of oxygen. This analytical technique is developed herein, and applied to garnets from high alumina metapelites of the Hoosac Schist of Western Massachusetts. These large garnets contain concentric unconformity textures which are attributed to at least two metamorphic events. Core-rim zoning profiles from three Hoosac garnets has been accomplished. Metamorphic modelling in the complex chemical system Na2O-CaO-MnO-K2O-FeO-MgO-Al2O3- SiO2-H2O has yielded P-T estimates for garnet cores of 520°C and 8.5 kbar, and rims at 590°C and 8-10kbar. Within this framework, a new approach enables calculation of oxygen isotope shifts with reaction progress in the presence of a non-equilibrium fluid. Fitted profiles from the Hoosac garnets imply prograde core growth during inflow of external low-δ18O fluid, and calculations suggest a minimum time integrated fluid flux for the first garnet growth event of the order of 0.2 cm3/cm2, some four to five orders of magnitude less than other New England studies.
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Chen, Yanying. "Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota." University of Missouri - Columbia, 2013.

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Goodwin, Nicholas Robert John. "A combined noble gas and halogen study of orogenic gold mineralisation in the Alpine and Otago schists, New Zealand." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/a-combined-noble-gas-and-halogen-study-of-orogenic-gold-mineralisation-in-the-alpine-and-otago-schists-new-zealand(13ee01c8-ee06-4dab-9fa7-704948f0f834).html.

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Quartz and pyrite samples from Pliocene-recent, sub-economic orogenic gold mineralisation in the Southern Alps and Mesozoic economic deposits in the Otago Schist Belt have been analysed for noble gases and halogens. Palaeo-hydrothermal fluids preserved in fluid inclusions were released by crushing and analysed by mass spectrometry. Helium isotope measurements confirm the absence of a mantle-derived fluid component in gold-bearing veins from the Southern Alps and at the large gold deposit at Macraes in Otago. A possible minor mantle helium component is observed in veins within 10km of the Alpine Fault that do not contain gold. Halogen ratios support the absence of mantle-derived fluid and support the presence of a crustal fluid derived from sediments, indicated by high I/Cl ratios. Mixing trends between 40Ar/36Ar and Cl/36Ar indicate mixing between a meteoric-derived fluid or air and crust-derived fluid in all sample types. A correlation between 40Ar/36Ar and 132Xe/36Ar shows that xenon is also sourced from the crustal fluid. Despite a strong crustal-radiogenic Ar signal in some samples, measured neon isotope ratios are atmosphere like. Noble gas elemental ratios show strongly fractionated 20Ne/36Ar away from air-saturated water and air values in deeper formed veins, suggesting air contamination is not dominant. Evidence for the presence of a significant trapped vapour phase is provided by calculated noble gas concentrations in water. Formation of this vapour phase using a two-stage model of de-gassing of meteoric water, and subsequent partial re-dissolution by a Rayleigh fractionation process could account for fractionated 20Ne/36Ar and atmospheric neon isotope ratios. In the Southern Alps, three main types of mineralisation can be identified by noble gas and halogen properties. Deep forming veins contain the most gold and are characterised by 20Ne/36Ar greater than air, 132Xe/36Ar ratios up to 75 times the air value, indicating metamorphic and meteoric fluid components. Some deep ankeritic type veins that display evidence of a CO2-rich component fluid show the highest 20Ne/36Ar ratios. Shallow, late veins have 20Ne/36Ar between air-saturated water and air values, and lower xenon and iodine contents. These veins formed from a boiling rock-exchanged meteoric fluid with a minor metamorphic fluid component and contain less gold. The characteristics of the Nenthorn deposit in Otago are similar to those of the shallow Alpine veins. The economically significant Macraes deposit possibly formed from a meteoric component and a strong metamorphic fluid component derived from the original sediments. This is indicated by the highest levels of excess xenon (relative to air) determined in this study. There is some potential for xenon to be used to fingerprint gold bearing fluids sourced from similar metasedimentary piles in orogenic belts.
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Books on the topic "Schists"

1

Himmelberg, Glen R. Petrologic characterization of peletic schists in the western metamorphic belt, coast plutonic-metamorphic complex, near Juneau, southeastern Alaska. Washington: U.S. G.P.O., 1994.

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Michniewicz, Marek. Mineralizacja cynowa w środkowej części pasma łupkowego Starej Kamienicy (Sudety zachodnie): Tin mineralization in the middle part of the Stara Kamienica schist belt (western Sudetes). Warszawa: Państwowy Instytut Geologiczny, 2006.

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Donato, Mary M. A newly recognized ductile shear zone in the northern Klamath Mountains, Oregon: Implications for Nevadan accretion. Washington: U.S. G.P.O., 1992.

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Grapes, R. H. X.R.F. analyses of quartzo-feldspathic schists and metacherts, Franz Josef-Fox Glacier area, Southern Alps of New Zealand. [Wellington]: Victoria University of Wellington, 1985.

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W, Tabor R., and Geological Survey (U.S.), eds. Major-and trace-element composition of greenstones, greenschists, amphibolites, and selected mica schists and genisses from the North Cascades, Washington. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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W, Tabor R., and Geological Survey (U.S.), eds. Major-and trace-element composition of greenstones, greenschists, amphibolites, and selected mica schists and genisses from the North Cascades, Washington. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Lewis, James R., and Sarah M. Lewis, eds. Sacred Schisms. Cambridge: Cambridge University Press, 2009. http://dx.doi.org/10.1017/cbo9780511581038.

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Rogers, R. Vashon. Schism: A sermon preached at Bytown before the Eastern Clerical Association, on Thursday, January 10th, 1839 and published at their request. [Cobourg, Ont.?: s.n., 1987.

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Schiess, Adrian. Adrian Schiess. London: Showroom), 1994.

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Bonhomme, Jean-François. Schismē phōtos. Athēna: Holkos, 2001.

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Book chapters on the topic "Schists"

1

Le Cor, Thomas, Damien Rangeard, Véronique Merrien-Soukatchoff, and Jérôme Simon. "Mechanical Characterization of Weathered Schists." In Engineering Geology for Society and Territory - Volume 6, 809–12. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09060-3_145.

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Thompson Jr., James B. "10. Modal Spaces for Pelitic Schists." In Micas, edited by Annibale Mottana, Francesco Paolo Sassi, James B. Thompson, and Stephen Guggenheim, 449–62. Berlin, Boston: De Gruyter, 2002. http://dx.doi.org/10.1515/9781501509070-015.

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Reymond, M. C., J. Fr Thimus, and Ph Linze. "Acoustic Emission Characteristics of Schists and Sandstones." In Physical Acoustics, 591–98. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-9573-1_79.

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Yardley, B. W. D. "Fluid Migration and Veining in the Connemara Schists, Ireland." In Advances in Physical Geochemistry, 109–31. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4612-4896-5_5.

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van den Berg, H., M. A. de Jong-van der Wal, and C. C. C. Beeldman-Brinkman. "Schisis." In Verpleegkundig Vademecum, 757–60. Houten: Bohn Stafleu van Loghum, 2008. http://dx.doi.org/10.1007/978-90-313-7326-0_145.

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Parker, Ian. "Schisms." In Psychoanalysis, Clinic and Context, 20–30. Milton Park, Abingdon, Oxon; New York, NY : Routledge, 2019.: Routledge, 2019. http://dx.doi.org/10.4324/9780429031991-3.

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Akbarpuran Haiyati, S. A., Yu L. Gulbin, A. N. Sirotkin, and I. M. Gembitskaya. "Compositional Evolution of Ree- and Ti-Bearing Accessory Minerals in Metamorphic Schists of the Atomfjella Series, Western Ny Friesland, Spitsbergen." In Springer Proceedings in Earth and Environmental Sciences, 125–32. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-23390-6_17.

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Gamble, Andrew. "Conservative Schisms." In Between Europe and America, 161–88. London: Macmillan Education UK, 2003. http://dx.doi.org/10.1007/978-1-4039-4045-2_8.

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Ghose, Naresh Chandra, Nilanjan Chatterjee, and Fareeduddin. "Glaucophane Schist." In A Petrographic Atlas of Ophiolite, 169–81. New Delhi: Springer India, 2013. http://dx.doi.org/10.1007/978-81-322-1569-1_23.

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Drakeford, Mark. "Splits and Schisms." In Social Movements and their Supporters, 50–64. London: Palgrave Macmillan UK, 1997. http://dx.doi.org/10.1057/9781137001627_4.

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Conference papers on the topic "Schists"

1

Maxwell, J. Luke, Oliver M. Wolfe, Frank S. Spear, and John T. Cheney. "EVALUATION OF OVERSTEPPING IN GARNET SCHISTS FROM SYROS, GREECE." In Joint 69th Annual Southeastern / 55th Annual Northeastern GSA Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020se-344814.

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Mariottini, Francesco, Gianluca Vignaroli, Maurizio Mariottini, and Mauro Roma. "Schists and Pigments from Ancient Swat (Khyber Pukhtunkhwa, Pakistan)." In XI International Conference of ASMOSIA. University of Split, Arts Academy in Split; University of Split, Faculty of Civil Engineering, Architecture and Geodesy, 2018. http://dx.doi.org/10.31534/xi.asmosia.2015/07.04.

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M. Lerssi, J., and K. Virtanen. "Influence of Black Schists to Metal and Sulphur Content of Peat." In Near Surface 2006 - 12th EAGE European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2006. http://dx.doi.org/10.3997/2214-4609.201402706.

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Tillard, S. "Radar wave propagation in isotropic and anisotropic geological formations (Granite and Schists)." In 54th EAEG Meeting. European Association of Geoscientists & Engineers, 1992. http://dx.doi.org/10.3997/2214-4609.201410469.

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El-Shazly, Aley, Breana Felix, Sierra Rose Willard, and Paul Summers. "PETROLOGY AND GEOCHEMISTRY OF THE LITTLE PINE GARNET MINE SCHISTS, WESTERN BLUE RIDGE." In Joint 56th Annual North-Central/ 71st Annual Southeastern Section Meeting - 2022. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022nc-374492.

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Agrahari, S., A. Singh, A. Yadav, A. Shlykov, and A. Saraev. "Delineation of Resistivity Anisotropy of Schists Using ERT Data in the Sighbhum Shear Zone, Ghatshila." In 2nd EAGE/Aqua Foundation Indian Near Surface Geophysics Conference & Exhibition. European Association of Geoscientists & Engineers, 2023. http://dx.doi.org/10.3997/2214-4609.202375045.

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Jaret, Steven, Nicholas D. Tailby, Keiji Hammond, Denton Ebel, Kathleen Wooton, and E. Troy Rasbury. "PROVENANCE, TECTONIC HISTORY, AND GEOCHEMISTRY OF THE MANHATTAN AND HARTLAND SCHISTS IN NEW YORK CITY." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-370151.

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Teixeira, R. j. s., S. c. c. Gomes, M. e. p. Gomes, C. Coke, and A. j. c. m. Pereira. "A Detrital Zircon LA-Q-ICPMS U-Pb Study of Upper Schists from Vila Nune Unit, Northern Portugal." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2578.

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Evans, Cameron, and Brittani D. McNamee. "INVESTIGATION OF TI BEARING AND NON-TI BEARING BIOTITES COEXISTING IN METAPELITE SCHISTS FROM MOUNT MITCHELL, NORTH CAROLINA." In 67th Annual Southeastern GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018se-311975.

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Nasipuri, Pritam, and Dr Hifzurrahman. "First report of Cambro-Ordovician aged monazites from Lesser Himalaya Schists and its implications in peri- Gondwana craton amalgamation." In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.12054.

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Reports on the topic "Schists"

1

Joy, B. R., M. J. Keskinen, and R. J. Newberry. Preliminary thermobarometry and microprobe mineral compositions, Fairbanks area schists and amphibolites. Alaska Division of Geological & Geophysical Surveys, 1996. http://dx.doi.org/10.14509/1736.

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Kuster, K., C. M. Lesher, and M. G. Houlé. Geology and geochemistry of mafic and ultramafic bodies in the Shebandowan mine area, Wawa-Abitibi terrane: implications for Ni-Cu-(PGE) and Cr-(PGE) mineralization, Ontario and Quebec. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329394.

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The Shebandowan Ni-Cu-(PGE) deposit occurs in the Shebandowan greenstone belt in the Wawa-Abitibi terrane. This deposit is one of a few economic Ni-Cu-(PGE) deposits in the Superior Province and one of a very few deposits worldwide that contains both Ni-Cu-(PGE) and Cr-(PGE) mineralization. The mafic-ultramafic successions in the area comprise abundant flows and sills of tholeiitic basalt and lesser Al-undepleted komatiite (MgO &amp;gt;18 wt%, Al2O3/TiO2 = 15-25), the latter indicating separation from mantle sources at shallow levels. Siliceous high-Mg basalts (MgO 8-12 wt%, SiO2 &amp;gt; 53 wt%, TiO2 &amp;lt; 1.2 wt%, La/Sm[MN] &amp;lt; 1-2) are relatively abundant in the area and likely represent crustally contaminated komatiites. Ultramafic bodies in the Shebandowan mine area comprise at least three or four komatiitic sills (A-B, C, D) and at least two komatiitic flows (E, F), all of which are altered to serpentinites or talc-carbonate schists with relict igneous chromite and rare relict igneous orthopyroxene-clinopyroxene. Unit A-B contains pentlandite-pyrrhotite-chalcopyrite-pyrite-magnetite mineralization, occurring as massive sulfides, sulfide breccias, or stringers, and subeconomic chromite mineralization in contorted massive bands varying from a few millimetres up to 10 metres thick. The localization of massive and semi-massive Ni-Cu-(PGE) ores along the margins of Unit A and the paucity of disseminated and net-textured ores suggest tectonic mobilization. Chromite is typically zoned with Cr-Mg-Al-rich (chromite) cores and Fe-rich (ferrichromite/magnetite) rims due to alteration and/or metamorphism, but rarely contains amoeboid magnetite cores. The thickness of chromite in Unit B is too great to have crystallized in cotectic proportion from the komatiitic magma and a model involving dynamic upgrading of magnetite xenoliths derived from interflow oxide facies iron formations is being tested.
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Campbell, J. E., and P. J. Henderson. Surficial geology, Denare Beach-Schist Lake, Saskatchewan-Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/209396.

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Erdmer, P. The Nisling Schist in eastern Dezadeash map area, Yukon. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127470.

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Digel, S., and T. M. Gordon. Low - To Medium - Grade Metamorphism of Metabasites At Schist Lake, near Flin Flon, Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/131243.

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Hannibal, Joseph T. Bringing millstones to America: 19th century use of Norwgian mica-schist millstones in the United States. Universitat de Lleida. Departament d'Història. Secció d'Arqueologia, Prehistòria i Història Antiga, 2019. http://dx.doi.org/10.21001/rap.2019.extra-4.21.

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Morris, S. C., and H. B. Whittington. Les fossiles des schistes de Burgess : un trésor national dans le parc national de Yoho, Colombie-Britannique. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/121106.

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Rivard, C., and H. Kao. Les effets de l'exploration et du développement des gaz de schiste sur l'eau souterraine et la sismicité. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2016. http://dx.doi.org/10.4095/311156.

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Scromeda-Perez, N., and T. J. Katsube. Spectral induced polarization measurements of sericite schist and ore samples from the Yellowknife mining district, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2001. http://dx.doi.org/10.4095/212682.

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Connell, S., and N. Scromeda-Perez. Electrical conductivity mechanism of sericite schist from Gold Lake area of the Yellowknife mining district, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213168.

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