THE CHARACTERISTICS OF ORE MINERALIZATION IN THE WEISSWASSER COPPER DISTRICT, GERMANY

2017 ◽  
pp. 0-0
Author(s):  
Henryk KUCHA ◽  
Bartłomiej BIL
Keyword(s):  
Morphological Changes ◽  
Copper Sulphide ◽  
The North ◽  
Tectonic Events ◽  
Framboidal Pyrite ◽  
Reflected Light ◽  
Ore Minerals ◽  
Ore Mineralization ◽  
Native Silver ◽  
North Western

The research deals with drill core samples collected during exploration of copper in the Weisswasser area in Saxony. The area is the north-western part of the North-Sudetic Basin, the lithostratigraphic section of which is similar to the typical one known from the Lubin district. As a result of mineralogical observations using reflected light microscopy and scanning electron microscopy, the following minerals were identified: chalcopyrite, chalcocite, bornite, digenite, galena, sphalerite, native silver, Ag-amalgams, mckinstyite, anilite and betechtinite. Detailed characteristics of the occurrence of sulphide mineralization is presented, describing its form, mutual inclusions and paragenesis, relationship to microtectonic conditions, as well as implications of morphological changes on the bottom of the Zechstein. Three forms of mineralization were found: (1) horizontal, mid-layered copper sulphide lenses formed by hydraulic peeling along the sludge lamination surfaces caused by mineralized high-pressure solutions, (2) horizontal copper sulphide lenses replacing previous framboidal pyrite lenses, and (3) replacement of bioclasts. Copper sulphides were concentrated at the expense of sulphur deposited during sedimentation and early diagenesis as bacterial pyrite. Ore mineralization occurs in the thin horizon with an extensive microtectonic net. Two tectonic episodes can be distinguished: Mesozoic tectonic events that enabled seismic pumping of hot fluids, and microfractures that developed during ore minerals precipitation. Futhermore, single sharp-edged grains of chalcopyrite disturbing lamination of copper shale are observed. It indicates the displacement of grains from crushed conglomerate and resedimentation together with copper shale.

scholarly journals PEMODELAN BAWAH PERMUKAAN MANIFESTASI MINERAL DENGAN METODE GEOMAGNETIK DAERAH PACITAN JAWA TIMUR

KURVATEK ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 25-33
Author(s):  
Fatimah Fatimah
Keyword(s):  
Image Data ◽  
Geological Structure ◽  
Magnetic Data ◽  
Magnetic Intensity ◽  
Magmatic Arc ◽  
The North ◽  
Ore Minerals ◽  
Ore Mineralization ◽  
Extensional Structure ◽  
Anomaly Map

Tulakan Subdistrict, Pacitan Regency, East Java Province. This area is part of the Southern Mountain Zone of East Java, which is the Sunda-Banda magmatic arc of Oligo-Miocene age, where there are alterations and indications of valuable ore minerals. Field magnetic data is taken in an area of 1 x 1 km, with the looping method on the grid trajectory within 200 x 100 m. Then, magnetic data correction and data processing were carried out with Oasis Montaj. From the magnetic anomaly map, the value of high magnetic intensity in the southern part is fresh (intrusive) andesit-dasitic rock as host rock which causes alteration, in the middle has a low magnetic intensity value which is in the direction of the relatively NE-SW river direction, whereas in the north with high intensity is fresh andesite lava. From the image data, it can be seen that the straightness pattern of the geological structure which is dominated by the extensional structure with the direction of NE-SW and E-W is the main trap of epithermal veins carrying ore mineralization mainly Cu, Pb in the study area.

Accessory and Ore Mineralization of Schists from the Basement of the Yamal Peninsula (Zapadno-Yarotinsky Area, Western Siberia)

2021 ◽  
pp. 49-55
Author(s):  
Yuriy V. Erokhin ◽  
Kirill S. Ivanov ◽  
Anatoliy V. Zakharov ◽  
Vera V. Khiller
Keyword(s):  
Western Siberia ◽  
The Arctic ◽  
Yamal Peninsula ◽  
Metamorphic Rocks ◽  
The West ◽  
Temperature Range ◽  
Ore Minerals ◽  
Ore Mineralization ◽  
Native Silver ◽  
The Yamal Peninsula

The results of studying the mineralogy of metamorphic schists from the Pre-Jurassic base of the Arctic part of the West Siberian plate are presented. The accessory and ore mineralization of schists from the Zapadno-Yarotinsky license area located in the southern part of the Yamal Peninsula is studied. The schists was uncovered by the Zapadno-Yarotinskaya No. 300 well at a depth of 2762 m. Above the section, the metamorphic rocks are overlain by a young Meso-Cenozoic cover. The schists are mainly composed of quartz, plagioclase (albite), carbonates (dolomite and siderite), mica (muscovite) and chlorite (donbassite). The discovered accessory and ore minerals in the metamorphic schists of the Zapadno-Yarotinsky area can be divided into two groups. The first group includes minerals that were formed during the metamorphism of schists, or were preserved as detrital matter. These minerals include zircon, fluorapatite, and rutile as the most stable compounds. The remaining mineralization (pyrite, sphalerite, chalcopyrite, cubanite, galena, cobaltite, barite, xenotime-(Y), goyazite, synchysite-(Nd), native silver and copper) is clearly secondary and was formed as a result of superimposed metasomatic processes. Judging from the described mineralogy, the schists underwent changes as a result of superimposed propyllitization. The temperature range of this process is determined by the formation of cubanite in association with chalcopyrite at a temperature of 200-210 оС.

scholarly journals Výskyty hydrotermálnej Sb-Au mineralizácie na lokalitách Lomnistá, Husárka a Suchá dolina pri Jasení (Nízke Tatry)

2020 ◽  
Vol 28 (1) ◽  
pp. 210-218
Author(s):  
Štefan Čík ◽  
Martin Chovan ◽  
Juraj Majzlan
Keyword(s):  
Primary Sources ◽  
Two Phase ◽  
Alluvial Sediments ◽  
Secondary Minerals ◽  
Reflected Light ◽  
Ore Minerals ◽  
Ore Mineralization ◽  
Homogenization Temperatures ◽  
Rock Alteration ◽  
Phase Fluid

Ore mineralization in small Sb-Au occurrences Lomnistá, Husárka and Suchá dolina (Nízke Tatry Mts., Western Carpathians) was investigated by reflected-light microscopy, electron microprobe, fluid inclusion measurements, identification of host rock alteration and secondary minerals. Hydrothermal Sb-Au mineralization was formed during the arsenopyrite-pyrite-gold and stibnite-Pb-Sb-sulfosalts stages. The first stage of mineralization consists of arsenopyrite, pyrite, and quartz, but gold, typical for this stage in the Nízke Tatry Mts. is missing. Stibnite and zinkenite are dominant in the following stage in Lomnistá and Husárka. Berthierite and jamesonite are frequent in Suchá dolina. Other ore minerals identified here are sphalerite, chalcostibite, chalcopyrite, cinnabar, tetrahedrite-(Hg) at Lomnistá and Husárka and pyrrhotite, chalcostibite, tetrahedrite-(Fe), chalcopyrite, antimony, and gold in Suchá dolina. Identified secondary minerals are valentinite and stibiconite. Stibnite, gold, and other ore minerals were found in heavy-mineral fractions from alluvial sediments, pointing at short transport from the primary sources. Two quartz samples, thought to be related to stibnite or berthierite, contained two-phase fluid inclusions with salinity of 10 - 20 wt.% NaCl eq. The total homogenization temperatures are 230 - 330 ºC in Lomnistá and 200 - 260 ºC in Suchá dolina.

scholarly journals Geochemistry of tetrahedrite group minerals and associated silver paragenesis in the Boguszów baryte deposit, Poland

2020 ◽  
Vol 64 (4) ◽  
Author(s):  
Sławomir Mederski ◽  
Jaroslav PRSEK ◽  
Żaneta Niemasz
Keyword(s):  
Textural Features ◽  
Upper Carboniferous ◽  
Reflected Light ◽  
Ore Minerals ◽  
Ore Mineralization ◽  
Crystallization Conditions ◽  
Low Temperature Crystallization ◽  
Small Grains ◽  
The 19Th Century ◽  
Temperature Crystallization

Primary ore mineralization in the abandoned Boguszów baryte-polymetallic deposit, located in the Intra-Sudetic Depression, was studied by reflected light microscopy and electron microprobe. Ore minerals, occurring as veinlets, irregular aggregates and lenses in baryte veins are hosted by the Upper Carboniferous Chełmiec rhyodacite laccolith. They are dominated by galena, sphalerite (with Cd up to 0.04 apfu) and tetrahedrite group minerals (TGM). Four generations of the TGM were distinguished according to textural features and Ag content: (1) low-Ag tetrahedrite-(Zn) (Ag: 0.22–0.6 apfu), (2) Ag-enriched tetrahedrite-(Zn) and Ag-enriched tetrahedrite-(Fe) (Ag: 0.71–1.45 apfu), (3) members of the freibergite series: “freibergite-(Fe)” and “freibergite-(Zn)” (Ag: 3.21–3.48 apfu; Hg: up to 0.75 apfu), (4) member of the “freibergite-(Fe)” series (Ag: 5.32–5.78 apfu). Several elongated inclusions of Ag-bearing sulphosalts within galena crystals were observed (members of the series “freibergite-(Fe)” and “freibergite-(Zn)”, pyrargyrite and polybasite). These polymetallic silver-bearing ores were mined in Boguszów from the 15th to the 19th century. Additionally, small grains of cobalt-enriched löllingite and gersdorffite were observed, which were formed from fluids sourced from the ultramafic basement. The textural characteristics of the ore, the mineral paragenesis and the chemical composition of individual ore minerals indicate low-temperature crystallization conditions.

scholarly journals Polymetallic mineralization in Ediacaran sediments in the Żarki-Kotowice area, Poland

Mineralogia ◽  
2012 ◽  
Vol 43 (3-4) ◽  
pp. 199-212
Author(s):  
Łukasz Karwowski ◽  
Marek Markowiak
Keyword(s):  
Hydrothermal Activity ◽  
Tectonic Zone ◽  
Mineral Vein ◽  
Granitic Intrusion ◽  
Ore Minerals ◽  
Ore Mineralization ◽  
Native Silver ◽  
Polymetallic Mineralization ◽  
Native Bismuth ◽  
Almost All

AbstractIn one small mineral vein in core from borehole 144-Ż in the Żarki-Kotowice area, almost all of the ore minerals known from related deposits in the vicinity occur. Some of the minerals in the vein described in this paper, namely, nickeline, hessite, native silver and minerals of the cobaltite-gersdorffite group, have not previously been reported from elsewhere in the Kraków-Lubliniec tectonic zone. The identified minerals are chalcopyrite, pyrite, marcasite, sphalerite, Co-rich pyrite, tennantite, tetrahedrite, bornite, galena, magnetite, hematite, cassiterite, pyrrhotite, wolframite (ferberite), scheelite, molybdenite, nickeline, minerals of the cobaltitegersdorffite group, carrollite, hessite and native silver. Moreover, native bismuth, bismuthinite, a Cu- and Ag-rich sulfosalt of Bi (cuprobismutite) and Ni-rich pyrite also occur in the vein. We suggest that, the ore mineralization from the borehole probably reflects post-magmatic hydrothermal activity related to an unseen granitic intrusion located under the Mesozoic sediments in the Żarki-Pilica area.

Shifting Shores of the Anthropocene: The Settlement and (Unstable) Stabilisation of the North-Western Mediterranean Littoral Over the Nineteenth and Twentieth Centuries

2019 ◽  
Author(s):  
Giacomo Parrinello ◽  
Renaud Bécot ◽  
Marco Caligari ◽  
Ismael Yrigoy
Keyword(s):  
Morphological Changes ◽  
Analytical Framework ◽  
Western Mediterranean ◽  
Human Occupation ◽  
Secondary Sources ◽  
The North ◽  
Modern Era ◽  
Persistent Instability ◽  
North Western ◽  
Coastal Settlement

Human occupation of the littoral has dramatically increased in the modern era, leading to major ecological and morphological changes of the coastal zone that are central to current debates on the Anthropocene. While the existing interpretations tend to represent these changes in terms of human impact and despoliation, we argue that exclusive insistence on this aspect risks obfuscating the inherent dynamism and persistent instability of coastal environments, while erasing the differences in how historical actors interacted with this dynamism. Focusing on the north-western Mediterranean, we investigate the interaction between stabilisation and instability – the shifting nature of the shores. Based on an extensive analysis of secondary sources in five languages (Italian, French, Catalan, Spanish and English), we propose a tripartite analytical framework: first, we analyse new understandings of the coast; second, coastal integration and networks; finally, the physical transformations of the coastal environment. Through this approach, the paper sheds light on the contested and ultimately elusive stabilisation which accompanied modern coastal settlement and invites the reader to think historically about the Anthropocene from the perspective of shifting shores.

scholarly journals SEM studies of ore minerals in skarns from Garby Izerskie, Karkonosze-Izera block, south-western Poland

2013 ◽  
Vol 2 (1) ◽  
pp. 61-66
Author(s):  
Maciej Rybicki ◽  
Łukasz Karwowski ◽  
Kamila Banasik
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Native Gold ◽  
Reflected Light ◽  
Sem Study ◽  
Microscopical Method ◽  
Ore Minerals ◽  
Native Silver ◽  
Native Bismuth ◽  
Scanning Electron

Abstract In “Stanisław” quarry, that is located on Garby Izerskie, ore minerals-bearing calcsilicate skarns were found in 2009. The samples were studied using microscopical method of reflected light and scanning electron microscopy (SEM). Based on SEM study, the predominant ore minerals in investigated samples are chalcopyrite, pyrrhotite, bismuth telluride and native bismuth. Moreover, acanthite, native gold and native silver were also identified. Our studies are the first report of above mentioned minerals from the Garby Izerskie area.

scholarly journals Hera: Evidence for Multiple Mineralization Events and Remobilization in a Sediment-Hosted Au-Pb-Zn-Ag Deposit, Central New South Wales, Australia

2021 ◽  
Vol 6 (1) ◽  
pp. 28
Author(s):  
Ian T. Graham ◽  
Adam McKinnon ◽  
Khalid Schellen ◽  
Angela Lay ◽  
Elizabeth Liepa ◽  
...  
Keyword(s):  
New South ◽  
New South Wales ◽  
The North ◽  
South Wales ◽  
Facies Metamorphism ◽  
Ore Minerals ◽  
Native Silver ◽  
Hydrothermal Remobilization ◽  
Host Rocks ◽  
Sulfur Isotope Data

The Hera Au-Ag-Pb-Zn deposit of central New South Wales, Australia with a total undepleted resource of 3.6 Mt @ 3.3 g/t Au, 25 g/t Ag, 2.6% Pb and 3.8% Zn occurs on the SE margin of the Cobar Basin. It is hosted by the shallow marine Mouramba Group and overlying turbiditic Amphitheatre Group. The siltstones comprise various mixtures of quartz, plagioclase, muscovite-phengite, biotite and clinochlore, along with accessory titanite and ilmenite. The deposit comprises a number of discrete lodes which are steeply west-dipping and strike NNW. Each lode has different abundances of the main ore minerals sphalerite, galena, chalcopyrite, pyrrhotite and electrum-gold. The North Pod and Far West lenses have the most diverse mineralogy in additionally containing arsenopyrite, native silver, gudmundite, Ag-tetrahedrite, acanthite, dyscrasite, native antimony, nisbite and breithauptite. Electrum (continuous spectrum from Ag-rich to Au-rich) is associated with sulfides in the main ore lenses while native gold occurs in the host rocks along cleavages/lineations and away from the main ore. The sulfur isotope data from across the deposit indicates a magmatic source. Most of the deposit has experienced greenschist facies metamorphism with pervasive green chlorite alteration, though the North Pod differs in being distinctly Ag- and Sb-rich and has reached at least amphibolite facies metamorphism with a garnet-wollastonite-vesuvianite-tremolite assemblage. Tremolite is relatively abundant throughout most of the deposit suggesting widespread low-T skarn alteration. Cross-cutting pegmatites comprise quartz, plagioclase (labradorite-andesine) and microcline. Hydrothermal remobilization is relatively extensive and best explains the unusual Ag-Sb-As assemblages of the North Pod and Far West lodes.

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