SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WAKA:vet ;lar1:(nrm)"

Sökning: WAKA:vet > Naturhistoriska riksmuseet

  • Resultat 1-10 av 316
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • A. Marques, Ana F., et al. (författare)
  • The Seven Sisters Hydrothermal System : First Record of Shallow Hybrid Mineralization Hosted in Mafic Volcaniclasts on the Arctic Mid-Ocean Ridge
  • 2020
  • Ingår i: Minerals. - : MDPI AG. - 2075-163X.
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • We document the discovery of an active, shallow, seafloor hydrothermal system (known as the Seven Sisters Vent Field) hosted in mafic volcaniclasts at a mid-ocean ridge setting. The vent field is located at the southern part of the Arctic mid-ocean ridge where it lies on top of a flat-topped volcano at ~130 m depth. Up to 200 deg C phase-separating fluids vent from summit depressions in the volcano, and from pinnacle-like edifices on top of large hydrothermal mounds. The hydrothermal mineralization at Seven Sisters manifests as a replacement of mafic volcaniclasts, as direct intraclast precipitation from the hydrothermal fluid, and as elemental sulfur deposition within orifices. Barite is ubiquitous, and is sequentially replaced by pyrite, which is the first sulfide to form, followed by Zn-Cu-Pb-Ag bearing sulfides, sulfosalts, and silica. The mineralized rocks at Seven Sisters contain highly anomalous concentrations of ‘epithermal suite’ elements such as Tl, As, Sb and Hg, with secondary alteration assemblages including silica and dickite. Vent fluids have a pH of ~5 and are Ba and metal depleted. Relatively high dissolved Si (~7.6 mmol/L Si) combined with low (0.2–0.4) Fe/Mn suggest high-temperature reactions at ~150 bar. A delta-13C value of -5.4 permil in CO2 dominated fluids denotes magmatic degassing from a relatively undegassed reservoir. Furthermore, low CH4 and H2 (<0.026 mmol/kg and <0.009 mmol/kg, respectively) and 3He/4He of ~8.3 R/Racorr support a MORB-like, sediment-free fluid signature from an upper mantle source. Sulfide and secondary alteration mineralogy, fluid and gas chemistry, as well as delta-34S and 87Sr/86Sr values in barite and pyrite indicate that mineralization at Seven Sisters is sustained by the input of magmatic fluids with minimal seawater contribution. 226Ra/Ba radiometric dating of the barite suggests that this hydrothermal system has been active for at least 4670 +/- 60 yr.
  •  
2.
  •  
3.
  •  
4.
  • Andersson, Ulf Bertil, et al. (författare)
  • Emendment to the term complex in: “Guide for geological nomenclature in Sweden” (Kumpulainen 2016)
  • 2022
  • Ingår i: GFF. - : Taylor & Francis. - 1103-5897 .- 2000-0863. ; 144:3-4, s. 151-151
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Since the publication of Kumpulainen (2016), the Committeehave been alerted by the investigation and subsequent changesto the North American Stratigraphic Code concerning thelithodemic unit“complex”(Easton et al.2016; North Ameri-can Commission on Stratigraphic Nomenclature (NACSN)2017). These changes concern the introduction of the nomen-clature unit“Intrusive Complex”. In the original version(NACSN1983), as well as in the Swedish Guide for nomencla-ture (Kumpulainen2016), the unit“complex”is defined ascontaining at least two genetic classes of rocks, i.e., igneous,sedimentary, or metamorphic.
  •  
5.
  • Andriambololonera, Sylvie Renée, et al. (författare)
  • Mussaendeae-Sabiceeae clade (subfamily Ixoroideae)
  • 2022
  • Ingår i: The new Natural History of Madagascar. - USA : Princeton University Press. ; , s. 756-758
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
  •  
6.
  • Artedi, Peter, et al. (författare)
  • Ichthyologia
  • 2022
  • Bok (övrigt vetenskapligt/konstnärligt)
  •  
7.
  •  
8.
  • Bagriy, I.D., et al. (författare)
  • H2 - Ecological source of decarbonization - The path to energy independence of Ukraine
  • 2023
  • Bok (övrigt vetenskapligt/konstnärligt)abstract
    • The research studied the pressing problem of the fuel and energy strategy of the XXI century. For the first time, there was shown the diversity of the authors' approach to theoretical and applied problems of hydrogen energy. General issues of fundamental and applied aspects of hydrogen origin were covered. The study provides the results of scientific developments on hydrogen mapping performed within the framework of scientific and practical exploratory and geo-ecological research on more than 200 hydrocarbon objects both on land (including mining fields) and in marine water areas. Prognostic and search system criteria were substantiated, with hydrogen being used for the first time as a component of the complex of methodical solutions in the search practice. The research showed the importance of solving the problem of geo-ecological processes and accidents in mine workings and wells, connected to numerous disasters. According to numerous studies of mine massives, a set of preventive measures and criteria that prevent explosive processes was provided.The presence of a unique complex of natural components of hydrogen technology, solar and wind energy resources and fresh waters of the Danube lakes and the Danube was stated.The study emphasises the decisive role of Ukraine in the competition for primacy in scientific developments. For the first time in world practice, the implementation of global projects for the extraction and production of green and white hydrogen was substantiated.The technology was tested on numerous hydrocarbon deposits, water resources and mine workings and therefore has all the prospects for the effective application in the search and extraction of hydrogen. This monograph can be useful and informative for specialists in the fields of oil and gas geology, general and regional geology, hydrology, environmental protection, as well as for the students and postgraduate students of fuel and energy, oil and gas geological and hydrological areas, as well as for domestic and foreign investors.
  •  
9.
  • Bauer, Harald, et al. (författare)
  • Die Gobholo-Höhle in Swasiland : Expedition in eine der längsten Granithöhlen der Welt
  • 2015
  • Ingår i: Die Höhlen. - Wien, Österreich : Verband Österreichischer Höhlenforscher. - 0018-3091. ; 66:1-4, s. 27-42
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • A small part of the Gobholo cave in westernSwaziland (southern Africa) has been usedfor touristic adventure tours for a few years,but the cave has never been surveyed norinvestigated scientifically. An internationalteam of speleologists started exploring, surveyingand documenting the cave in early2014. So far, more than 1 km has been surveyed,making Gobholo cave one of theworld’s longest granite caves and severalcontinuations are still unexplored. The upperparts of the cave are located in a rockfalldeposit overlying the Gobholo river, whereasthe lower parts originated from in-situweathering of the archaic alkali feldspargranite. The river floods large parts of thecave during heavy rainfalls and is responsiblefor the partial removal of the weatheringmaterial out of the cave. Manifold and numerousflowstones (composed of opal-Aand pigotite) probably formed via microbialprocesses. The cave is also a habitat for variousanimal species, including bats, spidersand cave crickets. Archaeologic artefactsprobably dating back to the local Stone Ageand Iron Age bear evidence of a former culturaluse of the cave. A thermal spring wasfound and temperature, CO2 and radonmeasurements provide data about the caveclimate which is characterised by fairly goodventilation. The age of the cave is uncertainbut the only approximately dated archaeologicalartefacts suggest a minimum age of40,000 years.
  •  
10.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 316
Typ av publikation
rapport (130)
tidskriftsartikel (76)
bokkapitel (57)
konferensbidrag (26)
annan publikation (16)
bok (7)
visa fler...
samlingsverk (redaktörskap) (1)
doktorsavhandling (1)
forskningsöversikt (1)
recension (1)
visa färre...
Typ av innehåll
övrigt vetenskapligt/konstnärligt (316)
Författare/redaktör
Faxneld, Suzanne (38)
Roos, Anna, 1961- (27)
Bisang, Irene (27)
Hålenius, Ulf (26)
Pasero, Marco (25)
Hatert, Frédéric (25)
visa fler...
Ericson, Per G P, 19 ... (24)
Danielsson, Sara (24)
Bignert, Anders (19)
Mills, Stuart J. (19)
Nyberg, Elisabeth (17)
Langhof, Jörgen, 196 ... (14)
Hedenäs, Lars (13)
Ek, Caroline (10)
Bergsten, Johannes, ... (9)
Eriksson, Ulla (9)
Soerensen, Anne L. (9)
Egebäck, Anna-Lena (8)
Fjeldså, Jon (8)
Sundbom, Marcus (8)
Lind, Ylva (8)
Razafimandimbison, S ... (7)
Neimanis, Aleksija (7)
Werdelin, Lars (6)
Denk, Thomas (6)
Haglund, Peter (6)
Bouchal, Johannes M. ... (6)
Persson, Per-Olof, 1 ... (6)
Ågren, Erik (5)
Sköld, Martin (5)
Friis, Else Marie (5)
Carlström, Julia, 19 ... (5)
Holm, Karin (5)
Berger, Urs (5)
Bergamini, Ariel (5)
van Rooy, Jacques (5)
Kylberg, Eva (5)
Helander, Björn, 194 ... (5)
Bäcklin, Britt-Marie ... (5)
Fång, Johan (4)
Vasileiou, Maria (4)
Vajda, Vivi (4)
Christidis, Les (4)
Swenson, Ulf, 1959- (4)
Morris, George (4)
Ivarsson, Magnus, 19 ... (4)
Bäcklin, Britt-Marie (4)
Helander, Björn (4)
Dahlgren, Henrik (4)
Moraeus, Charlotta, ... (4)
visa färre...
Lärosäte
Naturvårdsverket (7)
Riksantikvarieämbetet (5)
Uppsala universitet (3)
Högskolan i Gävle (2)
Linnéuniversitetet (2)
visa fler...
Göteborgs universitet (1)
Luleå tekniska universitet (1)
Stockholms universitet (1)
Örebro universitet (1)
Lunds universitet (1)
visa färre...
Språk
Engelska (217)
Svenska (87)
Tyska (4)
Norska (2)
Franska (1)
Latin (1)
visa fler...
Ryska (1)
Spanska (1)
Polska (1)
Portugisiska (1)
visa färre...
Forskningsämne (UKÄ/SCB)
Naturvetenskap (237)
Humaniora (18)
Lantbruksvetenskap (3)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy