scholarly journals Kremeňovo-karbonátové žily s U-Mo-Cu mineralizáciou v permských intermediárnych až bázických vulkanitoch hronika na lokalite Kravany (Kozie chrbty, východné Slovensko)

2020 ◽  
Vol 28 (2) ◽  
pp. 364-384
Author(s):  
Štefan Ferenc ◽  
Tomáš Mikuš ◽  
Ján Spišiak ◽  
Richard Kopáčik ◽  
Eva Hoppanová
Keyword(s):  
S Phase ◽  
Point Of View ◽  
Upper Permian ◽  
Ore Deposit ◽  
Clastic Sediments ◽  
Ore Minerals ◽  
Basic Volcanics ◽  
Basin Formation ◽  
Mo Content ◽  
Geological Position

Historical uranium ore deposit Kravany is located in the eastern part of Kozie Chrbty Mts., approximately 9 km SW of the district town Poprad. Stratiform, infiltration U-Cu-Pb mineralization is bound to the Upper Permian clastic sediments (Kravany Beds, member of Malužiná Formation, Hronicum Unit), which are enriched in fragments of carbonized flora. Vein U-Mo-Cu mineralization was found in the Upper Permian intermediate to basic volcanics intersecting the sediments of the Kravany Beds (also ore lenses). Vein filling originated in the following development stages: I.) Quartz-pyrite (quartz, pyrite, marcasite), II.) Dolomite-pyrite (dolomite, pyrite, marcasite, galena), III.) Copper (tetrahedrite, tennantite, chalcopyrite), IV.) Uranium-molybdenum (uraninite, Pb-Mo-S phase, coffinite, quartz), and V.) Calcite (calcite, chalcopyrite). The formation of mineralization can be explained by the geological position: random emplacement of the diorite porphyrite, resp. basalt-andesite dikes, directly in the preexisting U,Mo-bearing sediments. Vein U-Mo-Cu mineralization could thus most likely have formed according to the following scenario: I.) sedimentation of Kravany Beds in the Permian riftogenic basin: formation of beds of arkoses and arkosic sandstones with abundant fragments of charred flora, II.) formation of infiltration U mineralization: reduction and accumulation of U in sediments rich in organic matter, III.) emplacement of dikes of intermediate to basic volcanics: intersection of sediments with organics and with high U and Mo content, mobilization of formation fluids, assimilation of U and Mo into intermediate-basic magma, IV.) cooling of volcanic bodies → their contraction (formation of contraction cracks) → filling of contraction cracks with quartz, carbonates and ore minerals (crystallization from residual magmatic solutions mixed with formation waters). From this point of view it is syngenetic volcanogenic vein U-Mo-Cu mineralization, originally of the Permian age, with subsequent Alpine (most probably Cretaceous) reworking (this is evidenced by the variable composition of uraninite). It belongs to the Neohercynian late- to postorogenic metallogenetic stage. The possible younger, post-Permian age of mineralization from alpine hydrothermal solutions must also be assumed, but this consideration has several inconsistencies.

scholarly journals p27kip1 controls H-Ras/MAPK activation and cell cycle entry via modulation of MT stability

2015 ◽  
Vol 112 (45) ◽  
pp. 13916-13921 ◽  
Author(s):  
Linda Fabris ◽  
Stefania Berton ◽  
Ilenia Pellizzari ◽  
Ilenia Segatto ◽  
Sara D’Andrea ◽  
...  
Keyword(s):  
Phase Transition ◽  
Cell Cycle ◽  
Signaling Pathway ◽  
Mapk Pathway ◽  
Mapk Signaling ◽  
S Phase ◽  
Point Of View ◽  
Cell Cycle Entry ◽  
Pathway Activation ◽  
Direct Binding

The cyclin-dependent kinase (CDK) inhibitor p27kip1 is a critical regulator of the G1/S-phase transition of the cell cycle and also regulates microtubule (MT) stability. This latter function is exerted by modulating the activity of stathmin, an MT-destabilizing protein, and by direct binding to MTs. We recently demonstrated that increased proliferation in p27kip1-null mice is reverted by concomitant deletion of stathmin in p27kip1/stathmin double-KO mice, suggesting that a CDK-independent function of p27kip1 contributes to the control of cell proliferation. Whether the regulation of MT stability by p27kip1 impinges on signaling pathway activation and contributes to the decision to enter the cell cycle is largely unknown. Here, we report that faster cell cycle entry of p27kip1-null cells was impaired by the concomitant deletion of stathmin. Using gene expression profiling coupled with bioinformatic analyses, we show that p27kip1 and stathmin conjunctly control activation of the MAPK pathway. From a molecular point of view, we observed that p27kip1, by controlling MT stability, impinges on H-Ras trafficking and ubiquitination levels, eventually restraining its full activation. Our study identifies a regulatory axis controlling the G1/S-phase transition, relying on the regulation of MT stability by p27kip1 and finely controlling the spatiotemporal activation of the Ras-MAPK signaling pathway.

scholarly journals Lamprophyric dykes in Revdal, Scoresby Land, East Greenland: conflicting field observations and K-Ar age determinations

1990 ◽  
Vol 38 ◽  
pp. 1-9
Author(s):  
Poul-Henrik Larsen ◽  
Lars Stemmerik ◽  
Troels F.D. Nielsen ◽  
David C. Rex
Keyword(s):  
North Atlantic ◽  
Upper Permian ◽  
Alkaline Magmatism ◽  
Field Observations ◽  
Late Permian ◽  
Sea Floor ◽  
The North ◽  
Basin Formation ◽  
Sea Floor Spreading ◽  
Age Determinations

Field observations on Iamprophyric dykes in Revdal, Scoresby Land, suggest a Late Permian age and the dykes would thus represent magmatism related to Permian rifting and basin formation, whereas K-Ar age determinations and chemistry suggest a Tertiary age. It is concluded that the dykes probably are Tertiary and never penetrated Upper Permian sediments due to chilling and fracturing at the base of Upper Permian water rich sediments. The dykes most likely belong to a period of alkaline magmatism that followed the onset of sea floor spreading in this part of the North Atlantic around 55 Ma ago.

scholarly journals Badania georadarowe kemów jako przykład możliwości zastosowania metod geofizycznych do badania form zbudowanych z drobnoziarnistych osadów klastycznych = GPR surveys of kame hills as an example of geophysical methods being applied to the study of forms built of fine grained clastic sediments

2020 ◽  
Vol 92 (3) ◽  
pp. 423-446
Author(s):  
Piotr Lamparski
Keyword(s):  
Geophysical Methods ◽  
Ice Sheet ◽  
Geological Structure ◽  
Point Of View ◽  
Geological Mapping ◽  
Fine Grained ◽  
Clastic Sediments ◽  
Geophysical Surveys ◽  
Ground Penetrating ◽  
The Way

The Ground Penetrating Radar (GPR) method potentially offers many possibilities for fast and reliable lithostratigraphic sediment models to be developed. From a cognitive point of view, this represents a major simplification and shortening of procedures with which information about sediments can be obtained. And from the point of view of the economy of operations, there can be a significant reduction in costs and time of research in shallow geology and the stratigraphy of areas where unconsolidated clastic sediments are of superficial occurrence. Also noteworthy is the possibility for the results of GPR surveys to be deployed in support of geological mapping, as well as in the shallow exploration of resources and hydrogeological studies.The most major advantage of the GPR method related to the possibility of the structure of forms being observed in full shape. In the absence of large outcrops, geophysical prospection of geomorphological forms is helpful, insofar as we are able to translate the results of geophysical surveys into the actual lithostratigraphic system of sediments building a specific form.Against that background, the research presented in this article forms part of the work to develop radar stratigraphy, as an important support for direct geological research (Huggenberger et al., 1994; Van Overmeeren, 1998; Beres et al., 1999, Overgaard and Jakobsen, 2001; Jakobsen and Overgaard, 2002; Neal, 2004; Lejzerowicz et al., 2014; Żuk and Sambrook Smith, 2015; Lejzerowicz et al., 2018). It also points to the research potential of the GPR method in determining the genesis of form. The discussion on the way kames form has been going on in the literature for years (Niewiarowski, 1959; 1961; Karczewski, 1971; Klajnert, 1978; Jaksa, 2003; Terpiłowski, 2008). The studies presented here do not suffice to allow the matter to be determined comprehensively, even though they do provide for verification of the opinions of previous researchers.The area forming the subject of this article is defined by Niewiarowski (1959) as the dead ice zone because of the characteristic set of forms (dead ice moraines, kames and eskers). Like modern researchers (Terpiłowski, 2008), Niewiarowski points to the importance of sub-Quaternary surface elevations in the formation of cracks in the ice sheet, with this leading on to the formation of kame hills above such elevations. This would also seem to have been one of the reasons for the formation in the mass of ice of lakes whose filling with sediment and melting ice walls took the form of kames.The great advantage of the GPR method lies in its ability to recognise macrostructural sediment patterns in glacilimic forms. This diagnosis allows for the high-probability assessment of the genesis of form, especially in the context of its position being determined in the marginal zone of the ice sheet. Also looking extremely promising is the capacity for the thickness of fine clastic sediments lying on till to be determined using GPR. It allows for the determination of the way in which a given form is rooted.Described as they are in brief only, test results for selected sites serve to confirm the great usefulness of the GPR method in the recognition of shallow lithostratigraphy of clastic sediments. Nevertheless, this should not be the only method used to recognise the geological structure of forms and sediments. Significant interpretation ambiguities mean that the GPR method should act in support of direct lithostratigraphic research, not merely serving as an alternative to it. GPR surveys offer a depiction particularly close to the real one – of sediment present in homogeneous sediments in relation to electrical parameters. Sediments ideal for GPR surveys would for example be fine dry sands or silts – and it is precisely these sediments that built most of the investigated kame forms.

scholarly journals Neobvyklá žilná Cu-Zn-Ag-Pb-As-Sb-Se-Sn-Bi mineralizace z Jedové jámy u Vejprt v Krušných horách (Česká republika)

2020 ◽  
Vol 28 (2) ◽  
pp. 385-405
Author(s):  
Petr Pauliš ◽  
Zdeněk Dolníček ◽  
Roman Gramblička ◽  
Ondřej Pour
Keyword(s):  
Czech Republic ◽  
Mineral Assemblage ◽  
Point Of View ◽  
Ore Deposit ◽  
The Czech Republic ◽  
Quartz Veins ◽  
Group A ◽  
Native Bismuth

An extraordinary rich mineral assemblage consisting of 27 minerals has been newly discovered in quartz veins of the abandoned ore deposit, once exploited by the Drei König Mine, called also Giftschacht (Jedová jáma - Toxic shaft), situated approximately 2 km SE of Vejprty town. It includes 16 sulphides (plus one unnamed) with far prevailing arsenopyrite. In addition to common sulphides (chalcopyrite, sphalerite, galena and minerals of the tetrahedrite group), a wide suite of sulphosalts with substantial Bi-content was identified. Besides common bismuthinite and emplectite, also relatively rare Bi minerals (matildite, aikinite, hammarite, wittichenite), in the Czech Republic known from few localities only, have been found here. Bi is bound also in a rather exotic selenide bohdanowitzite and native bismuth. Bi is substantially present in some domains of tetrahedrites [tetrahedrite-(Zn), tennantite-(Zn) and tennantite-(Fe)]. In addition to local Bi enrichment, also Sn-minerals occur in the ore, represented by cassiterite and rare sulphides (kësterite and stannoidite). The presence of phosphates of the plumbogummite group [plumbogummite, goyazite and florencite-(Ce)] contributes to the remarkable mineral assemblage. From geochemical point of view, very interesting is the presence of florencite-(Ce), in which REE with dominating Ce are fixed. In addition, grains of fluorite, fluorapatite, rutile, topaz and aggregates of illite and a phase from kaolinite group are present. Supergene mineralization is represented besides limonite by abundant scorodite and rare strengite.

scholarly journals Mineralogy and Geochemistry of the Nižná Boca Sb-Au Hydrothermal Ore Deposit (Western Carpathians, Slovakia)

Mineralogia ◽  
2007 ◽  
Vol 38 (1) ◽  
pp. 71-94
Author(s):  
Alexander Smirnov ◽  
Jaroslav Pršek ◽  
Martin Chovan
Keyword(s):  
Fluid Inclusions ◽  
Homogenization Temperature ◽  
Western Carpathians ◽  
Mineral Association ◽  
Ore Deposit ◽  
Calculated Temperature ◽  
Temperature Range ◽  
Gold Stage ◽  
Ore Minerals

Mineralogy and Geochemistry of the Nižná Boca Sb-Au Hydrothermal Ore Deposit (Western Carpathians, Slovakia)Samples from hydrothermal Sb-Au mineralization in the area SE of Nižná Boca village in the N&iAzke Tatry Mountains were investigated using a variety of geochemical and mineralogical methods. Ore minerals typically occur in N-S striking quartz-carbonate veins hosted by an I-type biotite granodiorite to tonalite of Variscan Age (the Ďumbier Type). Paragenetic associations in the deposit are comparable to other mineralizations of the same type in the Ďumbierske Nízke Tatry Mountains. A quartz-arsenopyrite, pyrite stage of mineralization is the oldest with a calculated temperature of formation of about 445°C. It is followed by a quartz-carbonate-stibnite, zinkenite stage and, in turn, a quartz-carbonate-sphalerite-galena, boulangerite-gold stage. The gold typically contains between 9-18 wt.% Ag regardless of mineral association. No evidence for further generations of gold was found although it is possible that some gold was remobilized from the structure of the auriferous arsenopyrite. The Au and Ag content of the bulk ore ranges from 0.53 g.t-1to 20.2 g.t-1and from 0.9 g.t-1to 31.2 g.t-1, respectively. A tetrahedrite-chalcopyrite stage is followed by a barite-hematite stage - the youngest assemblage in the deposit. Fluid inclusions from the first mineralization stage are usually less than 3 μm in size and contain less than 3.6 wt.% CO2; salinity, density and homogenization temperature range from 2.7-16.3 wt.% NaCl(eq), 0.85-1.03 g.cm-1and 128-280°C, respectively.

scholarly journals Sequential Scheelite Mineralization of Quartz–Scheelite Veins at the Sangdong W-Deposit: Microtextural and Geochemical Approach

Minerals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 678
Author(s):  
Woohyun Choi ◽  
Changyun Park ◽  
Yungoo Song ◽  
Chaewon Park ◽  
Ha Kim ◽  
...  
Keyword(s):  
Fractional Crystallization ◽  
Hanging Wall ◽  
Geochemical Characteristics ◽  
Stage Ii ◽  
Oscillatory Zoning ◽  
Ore Deposit ◽  
Vein System ◽  
Pressure Release ◽  
System Pressure ◽  
Mo Content

The Sangdong W (tungsten)-deposit is known as one of the world’s largest W-deposits, a magmatic–hydrothermal ore deposit including both skarn and hydrothermal alteration zones. The strata-bound characteristic of the deposit resulted in three major orebodies (hanging wall, main, footwall). The main ore mineral is a scheelite (CaWO4)–powellite (CaMoO4) solid solution. We examined the fluid evolution and scheelite formation process of the quartz–scheelite veins of the ore deposit, based on the microtextures and geochemical characteristics of the scheelite. After the initial magmatic–hydrothermal fluid release from the granitic body, prograde skarn is formed. In the later prograde stage, secondary fluid rises and precipitates stage I scheelite. Well-developed oscillatory zoning with the highest Mo content indicates continuous fluid infiltration under an open system. Pressure rises as mineralization occurs, generating the pressure release of the retrograde fluid. Fluid migrates downward by the gravitational backflow mechanism, forming stage II to IV scheelites. Dented oscillatory zoning of stage II scheelite is strong evidence of this pressure release. Stage III and IV scheelite do not show specific internal structures with pure scheelite composition. Retrograde scheelites are formed by fractional crystallization under a closed system. The observation of systematical fractional crystallization in the quartz–scheelite vein system is a meaningful result of our research. The geochemical characteristics and microtextural evidence imprinted in scheelites from each stage provide crucial evidence for the understanding of sequential scheelite mineralization of the quartz–scheelite vein system of the Sangdong W-deposit.

scholarly journals Primary Research of Mine Waters from the Chrustenice Iron-Ore Deposit/ Prvotní Průzkum Důlních Vod Železorudného Ložiska Chrustenice

2012 ◽  
Vol 58 (4) ◽  
pp. 23-27
Author(s):  
Tomáš Bouchal ◽  
Jaroslav Závada ◽  
Hana Vojtková ◽  
Silvie Langarová ◽  
Radim Havelek
Keyword(s):  
Iron Ore ◽  
Mining Industry ◽  
Point Of View ◽  
Primary Study ◽  
Primary Research ◽  
Mine Waters ◽  
Ore Deposit ◽  
History Museum ◽  
Mining History ◽  
Iron Ore Deposit

Abstract This paper describes the primary research of mine waters in the Chrustenice Iron-ore Deposit. A particular attention is paid here to the research of microorganisms living in that environment. The goal of the research is to analyse mine waters in the area which was abandoned by people more than 45 years ago and to investigate microorganisms and representatives of species present there in the mine waters. The Chrustenice Mine ranked among the biggest and most important iron ore mines in Barrandien. This mine along with the mines in Nučice, Zdice, Nový Jáchymov and Mníšek pod Brdy contributed to the fame of the regional mining industry. Sedimentary oolitic iron ore in Chrustenice consists mostly of red iron ore based on Černín layers, siderite and, to a lesser extent, of haematite and chamosite. In exceptional cases, magnetite is present there. The Černín shale is black clay shale with sandy ingredients and many potash-mica scales. Now, the mine is flooded up to the 8th level. In the remaining area, there is a mining history museum with dozens of exhibits. In samples of the mining water taken on the site, mostly iron, manganese and sulphur microorganisms were identified. The primary study of the mine waters in the iron-ore deposit shows that, from the microbiological point of view, this site is very interesting and many chemolithotrophic species of bacteria are present there.

Geochronology at the Namew Lake Ni–Cu deposit, Flin Flon area, Manitoba, Canada: a Pb/Pb study of whole rocks and ore minerals

1991 ◽  
Vol 28 (9) ◽  
pp. 1328-1339 ◽  
Author(s):  
G. L. Cumming ◽  
D. Krstic
Keyword(s):  
Isotope Ratios ◽  
Pb Isotope ◽  
Ore Deposit ◽  
Zircon Age ◽  
Multi Stage ◽  
Supergene Enrichment ◽  
Show Evidence ◽  
Ore Minerals ◽  
Stage Process ◽  
Flin Flon

Pb-isotope ratios of whole-rock specimens and mineral separates from the gneisses surrounding the Namew Lake Ni–Cu deposit, south of Flin Flon, Manitoba, are compared with the Pb-isotope ratios in the ore minerals and with recently reported zircon U/Pb analyses of samples from the gneisses and the ultramafic host of the ore. The Pb/Pb age from the gneisses is 1864 ± 8 Ma, and there is no evidence for any differences in slopes or initial ratios between individual samples. Thus, there is good agreement between the youngest zircon ages for the gneisses (1862 ± 3 Ma) and Pb/Pb ages for the same rocks. A suite of analyses from a late pegmatite, which cuts the gneisses and the ultramafic rock, yields a well-defined age of 1824 ± 5 Ma, consistent with the geologic requirement that it be younger than the ultramafic host to the orebody (zircon age of 1847 ± 6 Ma) and similar in age to late intrusive bodies in the Flin Flon area to the north.All these data are in marked contrast to apparent Pb/Pb ages for the sulfphides of the ore deposit. Pb/Pb isochron ages on the ore minerals themselves are significantly older than the ages obtained for the gneisses and the ultramafic host. The Pb/Pb data show evidence for multi-stage evolution, with most leach-residue sets yielding en echelon lines with an apparent age of 1948 ± 13 Ma, whereas the residues indicate an older age of 1996 ± 19 Ma. The apparent ages can be explained as being the result of a three-stage process whereby U/Pb ratios were reduced by a factor of 1.6–2.0 at the time of supergene enrichment of the upper part of the ore deposit. This presumably occurred during the formation of the late Precambrian peneplane in the area. One sulphide sample from near the Precambrian–Paleozoic unconformity indicates resetting of the U/Pb system at about 1121 Ma, consistent with what would be expected from the supergene enrichment process.There is some indication of retrograde metamorphic formation of epidote in the gneisses at 1728 ± Ma but no direct evidence for late Hudsonian (1700–1750 Ma) effects on the ore.

scholarly journals The Buenaventura Sector of the San Finx W–Sn Deposit (NW Spain): Ore Mineralogy, Host Rocks and Associated Hydrothermal Alteration

2021 ◽  
Vol 6 (1) ◽  
pp. 11
Author(s):  
David Garófano-Medina ◽  
Mercedes Fuertes-Fuente ◽  
Antonia Cepedal ◽  
Agustín Martin-Izard
Keyword(s):  
Hydrothermal Alteration ◽  
Nw Spain ◽  
Ore Deposit ◽  
Main Host ◽  
Ore Minerals ◽  
Ore Mineralogy ◽  
Native Bismuth ◽  
Host Rocks ◽  
Spanish Province

The San Finx W–Sn ore deposit is located in the Spanish province of A Coruña (Galicia, NW Spain). Geologically, it occurs in the Galicia-Trás-os-Montes zone which is one of the innermost zones of the Iberian Variscan collisional belt. This ore deposit is characterized by NE–SW trending quartz-dominated veins with centimeter-size hübnerite and cassiterite. This research focuses on one sector of this deposit known as Buenaventura. The aim of this work is to present a mineralogical and petrological characterization of the ore-bearing veins, their host rocks and associated hydrothermal alteration. The vein mineralogy is mainly quartz, muscovite, K-feldspar, apatite and scarce fluorite. The ore minerals are hübnerite, scheelite and cassiterite with columbite and ilmenorutile-struverite inclusions, together with sulfides, mainly chalcopyrite and arsenopyrite, and, in less abundance, molybdenite, löllingite, pyrrhotite, sphalerite, stannite, pyrite, Bi-Pb-Ag sulfosalts and native bismuth. The main host-rocks are micaschist and paragneiss and two types of pegmatites, homogeneous pegmatites and banded aplite-pegmatites with columbite. The host rocks are affected by four types of hydrothermal alterations: tourmalinization, greissenization, feldspathization and silicification. The more widespread alteration is the feldspathization in which the protolith is replaced by massive albite and K-feldspar with fibrous habit, accompanied by apatite, chlorite, rutile, magnetite, hematite, chalcopyrite and sphalerite. In addition, there are highly deformed areas with a complex alteration rich in K-feldspar and sulfides, mainly chalcopyrite, minerals of the stannite group and sphalerite and, in less abundance, bismuthinite, native bismuth, galena and pyrite. This deposit shares features in terms of geological setting, hydrothermal alteration and ore assemblages with exogreisen systems formed in the cupolas of highly fractionated granites in collisional settings.

Phages-Adsorption -Test for Differentiation of Genus: Brucella

1965 ◽  
Vol 20 (12) ◽  
pp. 1249-1252
Author(s):  
Józef Parnas ◽  
Stefania Zalichta
Keyword(s):  
Brucella Abortus ◽  
Brucella Melitensis ◽  
S Phase ◽  
Point Of View ◽  
Brucella Suis ◽  
Specific Receptors

Brucella-phages-adsorption test on killed (70°) cells of all types of Brucella in the pure “S” phase has orientating value for determination of the Genus: “Brucella”.Brucella abortus “S” strains are in 100% positive in this test. Brucella melitensis “S” strains are in 83% positive and in 17% weakly positive.Brucella suis “S” strains are in 100% positive.Brucella atypica “S” strains are mostly positive. All types of Brucella in “R” phase are negative in this test. This experiment is important from point of view of general systematics of bacteria and for the explanation of phage-specific receptors in the “S” and “R” phase.

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