scholarly journals Mineralogical and geochemical specificity of carbonaceous rocks from the area of Ust'-Kara astrobleme (Pay-Khoy)

2021 ◽  
Vol 11 ◽  
pp. 3-15
Author(s):  
N. S. Kovalchuk ◽  
◽  
B. A. Makeev ◽  
S. A. Svetov ◽  
◽  
...  
Keyword(s):  
Hydrothermal Activity ◽  
Rare Metal ◽  
Impact Structure ◽  
Hydrothermal Processes ◽  
Upper Paleozoic ◽  
Modern Methods ◽  
Rare Earth Minerals ◽  
Carbonaceous Shales ◽  
Post Impact ◽  
Carbonaceous Rocks

We studied Upper Paleozoic (P1pt-ng) carbonaceous shales and siltstones from the area of the Ust'-Kara astrobleme (PayKhoy). We analyzed mineralogical and geochemical features of carbonaceous rocks of the target in the vicinity of the Ust'-Kara astrobleme event using a complex of modern methods to identify possible mobilization, redeposition and concentration of ore substance under intensive post-impact hydrothermal activity. Geochemical features of carbon deposits, altered by post-impact hydrothermal processes in the vicinity of the Ust'-Kara impact structure, have been determined. We found anomalous contents of Ti, Mn, Cr, Zr, Ni, Li, Co, Sc and REE. Inherent rare metal and rare earth minerals (monazite, florensite), sulfides (pyrite, chalcopyrite, marcasite, sphalerite), apatite, barite, anatase, chrome spinels were diagnosed.

scholarly journals Mineralogical and geochemical features of the black shales surrounding the Kara Astrobleme (Pay-Khoy)

LITOSFERA ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 168-183
Author(s):  
N. S. Kovalchuk ◽  
T. G. Shumilova
Keyword(s):  
Rare Earth ◽  
Black Shale ◽  
Black Shales ◽  
Late Paleozoic ◽  
Research Subject ◽  
Impact Structure ◽  
Hydrothermal Processes ◽  
Rare Earth Minerals ◽  
Post Impact ◽  
Academy Of Sciences

Research subject. The Late Paleozoic (D3–P1) black shale strata surrounding the Kara Astrobleme (Pay-Khoy) were studied. Materials and methods. The rocks were sampled radially along the profile from the edge of the astrobleme (the at the contact zone with impactites) with access to black shales that were not affected by post-impact transformations. An analysis of the mineralogical and geochemical features of the black shales surrounding the Kara astrobleme was carried out using a complex of modern research methods (Geonauka Centre for Collective Use, IG FRC Komi Scientific Centre, Ural Branch of the Russian Academy of Sciences) in order to identify the possible mobilisation, re-deposition and concentration of ore matter under the conditions of intensive post-impact hydrothermal altering. Results and conclusions. The geochemical features of the black shale deposits altered by post-impact hydrothermal processes in the vicinity of the Kara impact structure were determined. The sharp abnormal contents of Mn, B, Zr, Sr, Ge, Cd, Hf, Se and Eu as well as the abnormal contents of Ti, Ba, Cr, Rb, Li, Ce, La, Ga, Sc, Co, Cs, Gd, Dy and W were revealed. The geochemical concentration specificity of components in different regions of the Kara astrobleme associated with the specialisation of target rocks was established. Raremetal and rare-earth minerals, sulphides and thymannite (HgSe) were diagnosed.

scholarly journals The Saint-Honoré Carbonatite REE Zone, Québec, Canada: Combined Magmatic and Hydrothermal Processes

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 397 ◽  
Author(s):  
Alexandre Néron ◽  
Léo Bédard ◽  
Damien Gaboury
Keyword(s):  
Rare Earth ◽  
Late Stage ◽  
High Volume ◽  
Primary Crystallization ◽  
Hydrothermal Activity ◽  
Hydrothermal Crystallization ◽  
Carbonatite Complex ◽  
Hydrothermal Processes ◽  
Rare Earth Minerals ◽  
New Evidence

The Saint-Honoré carbonatite complex hosts a rare earth element (REE) deposit traditionally interpreted as being produced by late-stage hydrothermal fluids that leached REE from apatite or dolomite found in the early units and concentrated the REE in the late-stage units. New evidence from deeper units suggest that the Fe-carbonatite was mineralized by a combination of both magmatic and hydrothermal crystallization of rare earth minerals. The upper Fe-carbonatite has characteristics typical of hydrothermal mineralization—polycrystalline clusters hosting bastnäsite-(Ce), which crystallized radially from carbonate or barite crystals, as well as the presence of halite and silicification within strongly brecciated units. However, bastnäsite-(Ce) inclusions in primary magmatic barite crystals have also been identified deeper in the Fe-carbonatite (below 1000 m), suggesting that primary crystallization of rare earth minerals occurred prior to hydrothermal leaching. Based on the intensity of hydrothermal brecciation, Cl depletion at depth and greater abundance of secondary fluid inclusions in carbonates in the upper levels, it is interpreted that hydrothermal activity was weaker in this deepest portion, thereby preserving the original magmatic textures. This early magmatic crystallization of rare earth minerals could be a significant factor in generating high-volume REE deposits. Crystallization of primary barite could be an important guide for REE exploration.

scholarly journals Mineralogical-geochemical features of black shales from the frame of the Yayu igneous complex, Polar Urals

2020 ◽  
pp. 68-81
Author(s):  
N.S. Kovalchuk ◽  
T.G. Shumilova ◽  
S.A. Svetov
Keyword(s):  
Sedimentary Rocks ◽  
Rare Metal ◽  
Black Shales ◽  
Igneous Complex ◽  
Polar Urals ◽  
Hydrothermal Processes ◽  
Alluvial Gold ◽  
Rare Earth Minerals ◽  
Silver Mineral ◽  
Modern Analytical

The results of study of mineralogical-geochemical features of black shales from the frame of the Yayu igneous complex (Polar Urals) are presented on the basis of modern analytical methods in order to identify possible mobilization, redeposition and concentration of ore material during intensive hydrothermal alteration. The high contents of Li, Be, Ba, Ti, Mn, Zr, Rb, Sc, Cs, P, Nb, Ta, Th, and REE are revealed. Rare metal and rare-earth minerals and a silver mineral (most likely, hessite) are found, the presence of alluvial gold in alluvium is established. The metallogenic features of carbonaceous sedimentary rocks afected by hydrothermal processes at the contact zone with igneous rocks are determined. The conclusion is made on a possible fnding of primary gold related to hydrothermal mineralisation in black shale of the region.

Weathering of Post-Impact Hydrothermal Deposits from the Haughton Impact Structure: Implications for Microbial Colonization and Biosignature Preservation

Astrobiology ◽  
2011 ◽  
Vol 11 (6) ◽  
pp. 537-550 ◽  
Author(s):  
M.R.M. Izawa ◽  
Neil R. Banerjee ◽  
G.R. Osinski ◽  
R.L. Flemming ◽  
J. Parnell ◽  
...  
Keyword(s):  
Microbial Colonization ◽  
Impact Structure ◽  
Hydrothermal Deposits ◽  
Post Impact

Paleomagnetism and rock magnetism of East and West Clearwater Lake impact structures

2019 ◽  
Vol 56 (9) ◽  
pp. 983-993
Author(s):  
Jérôme Gattacceca ◽  
William Zylberman ◽  
Adam B. Coulter ◽  
François Demory ◽  
Yoann Quesnel ◽  
...  
Keyword(s):  
Rock Magnetism ◽  
Drill Hole ◽  
Hydrothermal Activity ◽  
Radiometric Dating ◽  
Impact Structure ◽  
The West ◽  
Impact Melt ◽  
Basement Rocks ◽  
East And West ◽  
The Impact

The East and West Cleawater Lake impact structures (Wiyâshâkimî Lake, Québec), ∼26 and 32 km in diameter, respectively, have been proposed to represent an impact doublet. We investigated their paleomagnetism to contribute to this debate. The paleomagnetic directions of the impact melt rocks and impact melt-bearing breccias from the West Clearwater structure are compatible with the radiometric age of 280–290 Ma previously determined for this structure and indicate that the impact occurred during a reverse polarity interval of the geomagnetic field. A similar remagnetization direction is found in the basement within 10 km of the structure center, whereas basement farther away from the center has escaped remagnetization by the impact. Samples for the East Clearwater structure come from two holes drilled in 1963 and 1964. Unfortunately, the drill hole through the melt rocks is tilted by 30° from the vertical with an unknown azimuth. The paleomagnetic inclination of these melt rocks cannot be constrained to better than between −28° and +32°. This is, however, distinct from the inclination of the melt rocks of the West Clearwater Lake impact structure (−27.8° ± 3.7°), suggesting that the two structures do not represent an impact doublet, in agreement with recent radiometric dating. The basement rocks and the melt rocks within 10 km of the center of the West Clearwater Lake impact structure show a magnetic signature of titanohematite that crystallized during postimpact hydrothermal activity under oxidizing conditions. This is not observed in the basement or the melt rocks from the East Clearwater Lake impact structure.

scholarly journals New evidence for persistent impact-generated hydrothermal activity in the Miocene Ries impact structure, Germany

2013 ◽  
Vol 48 (12) ◽  
pp. 2491-2516 ◽  
Author(s):  
Gernot Arp ◽  
Claudia Kolepka ◽  
Klaus Simon ◽  
Volker Karius ◽  
Nicole Nolte ◽  
...  
Keyword(s):  
Hydrothermal Activity ◽  
Impact Structure ◽  
New Evidence

Rare metals on shatter cone surfaces from the Steinheim Basin (SW Germany) – remnants of the impacting body?

2017 ◽  
Vol 155 (6) ◽  
pp. 1205-1229 ◽  
Author(s):  
E. BUCHNER ◽  
M. SCHMIEDER
Keyword(s):  
Hydrothermal Activity ◽  
Upper Jurassic ◽  
Lower Jurassic ◽  
Iron Meteorite ◽  
Rare Metals ◽  
X Ray ◽  
Central Uplift ◽  
Post Impact ◽  
Shatter Cones ◽  
First Time

AbstractThe ~3.8 km Steinheim Basin in SW Germany is a well-preserved complex impact structure characterized by a prominent central uplift and well-developed shatter cones that occur in different shocked target lithologies. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy and electron probe microanalysis have revealed, for the first time, the occurrence of rare metals on the Steinheim shatter cone surfaces. Shatter cones produced from the Middle Jurassic (Aalenian) Opalinus Claystone (‘Opalinuston’), temporarily exposed in the central uplift in spring 2010, and shatter cones in Upper Jurassic (Oxfordian) limestones from the southeastern crater rim domain are commonly covered by faint coatings. The Opalinus Claystone shatter cone surfaces carry coatings dominated by Fe, Ca, P, S and Al, and are covered by abundant small, finely dispersed microparticles and aggregates of native gold, as well as locally elevated concentrations of Pt. On several surfaces of the claystone shatter cones, additional Fe, Ni and Co was detected. The Ca–Mn-rich coatings on the limestone shatter cone surfaces locally include patches of Fe, Ni, Co, Cu and Au in variable amounts and proportions. The intriguing coatings on the Steinheim shatter cones could either stem from the impacted Lower Jurassic to Palaeogene sedimentary target rocks; from the crystalline-metamorphic Variscan crater basement; or, alternatively, these coatings might represent altered meteoritic matter from the Steinheim impactor, possibly an iron meteorite, which may have been remobilized during post-impact hydrothermal activity. We here discuss the most plausible source for the rare metals found adherent to the shatter cone surfaces.

scholarly journals Clarketal_2021.zip

2021 ◽  
Author(s):  
Martin Clark
Keyword(s):  
South Africa ◽  
Remote Sensing ◽  
Impact Structure ◽  
Aerial Photo ◽  
Special Issue ◽  
Still Images ◽  
Spatial Expression ◽  
Post Impact

This dataset is supplementary to a submitted manuscript to MDPI: Geosciences, "Making an Impact" special issue.<div><br></div><div>Manuscript title: Post-impact faulting of the Holfontein Granophyre Dike of the Vredefort Impact Structure, South Africa, inferred from remote sensing, geophysics, and geochemistry.</div><div>Authors: Clark, M.D., Kovaleva, E., Huber, M.S., Fourie, F., Harris, C.<br><div><br></div><div>The file contains an aerial photo and videos acquired via a drone which document the spatial expression of the geological dike.</div></div><div><br></div><div>Resolution of video is 4k (3840x2160 pix). Resolution of still images is 5472x3648 pix.</div>

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