Navigation überspringen
Universitätsbibliothek Heidelberg
Status: Bibliographieeintrag

Verfügbarkeit
Standort: ---
Exemplare: ---
heiBIB
 Online-Ressource
Verfasst von:Kleint, Charlotte [VerfasserIn]   i
 Bach, Wolfgang [VerfasserIn]   i
 Kleint, Jan F. [VerfasserIn]   i
Titel:Geochemical characterization of highly diverse hydrothermal fluids from volcanic vent systems of the Kermadec intraoceanic arc
Verf.angabe:Charlotte Kleint, Wolfgang Bach, Alexander Diehl, Nico Fröhberg, Dieter Garbe-Schönberg, Jan F. Hartmann, Cornel E. J. de Ronde, Sylvia G. Sander, Harald Strauss, Valerie K. Stucker, Janis Thal, Rebecca Zitoun, Andrea Koschinsky
E-Jahr:2019
Jahr:03 September 2019
Umfang:20 S.
Fussnoten:Gesehen am 06.02.2020
Titel Quelle:Enthalten in: Chemical geology
Ort Quelle:New York, NY [u.a.] : Elsevier, 1966
Jahr Quelle:2019
Band/Heft Quelle:528(2019) Artikel-Nummer 119289, 20 Seiten
ISSN Quelle:1872-6836
Abstract:During the R/V Sonne cruise SO253 in 2016/2017, hydrothermal vent sites along the Kermadec intraoceanic arc were sampled for hydrothermal fluids at four active volcanoes: Macauley, Haungaroa, Brothers and Rumble III, respectively. Water depths ranged between 290m and 1700m. A new vent field was discovered at Haungaroa. The samples were taken from diffuse-flow sites as well as from white and black smokers - rich in metals and gases - with discharge temperatures as high as 311°C. Their fluid composition is very variable but basically divides into two types: one that indicates distinct magmatic input and another that shows evidence for intense water-rock interaction under hot, acidic conditions. Fluid samples from Macauley, the shallowest sampling site (~300m), had Fe concentrations as high as 1.7mM, Al concentrations up to 122μM and H2S up to 10mM at a pH of only 1.2. At Brothers, the deepest sampling site (down to 1600m), we identified two different fluid types: 1) A magmatically-influenced type at the Upper and Lower Cone with highest temperatures of 115°C, up to 95.6mM Mg (the highest Mg concentration measured in fluids from intraoceanic arc systems so far), elevated SO42− (76.9mM), high H2S (5.0mM), but Fe concentrations of only 15μM and 2) A fluid with low Mg (5.4mM), low H2S (1.1mM), temperatures reaching 311°C and high Fe contents (12.4mM) at the Upper Caldera and NW Caldera Wall, typical of a black smoker fluid. Chloride concentrations in all fluids were similar, or highly enriched when compared to seawater (e.g. up to 787mM, brine fluids), with also one low-chlorinity vapor-phase fluid sample recovered, indicating that phase separation is occurring at Brothers. Unusual highly elevated Mg concentrations in fluids from the Brothers Lower Cone (95.6mM, compared to 53.2mM in ambient seawater) combined with highly elevated concentrations of SO42− (76.9mM, compared to 29.0mM in ambient seawater) indicate dissolution of Mg- and SO42−-bearing minerals in the subsurface, such as caminite. Our data show how highly diverse and variable island arc systems can be with respect to their fluid chemistry, both spatially and temporally. It adds to the still limited data set of arc systems compared to mid-ocean ridges and supplies an important contribution towards a better understanding of geochemical processes along arc volcanoes. The higher range in fluid chemistry together with shallower water depth implies that the fluids from intraoceanic arcs may contribute a significant fraction of dissolved metals not only to the global oceanic biogeochemical cycle but also into the photic zone, the area of highest bioproductivity.
DOI:doi:10.1016/j.chemgeo.2019.119289
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag ; Resolving-System: https://doi.org/10.1016/j.chemgeo.2019.119289
 Volltext: http://www.sciencedirect.com/science/article/pii/S0009254119303961
 DOI: https://doi.org/10.1016/j.chemgeo.2019.119289
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:High Mg-fluids
 High-chlorinity acid-sulfate fluids
 Hydrothermalism at intraoceanic arcs
 Kermadec arc
 Trace metals
K10plus-PPN:1689525436
Verknüpfungen:→ Zeitschrift

Permanenter Link auf diesen Titel (bookmarkfähig):  https://katalog.ub.uni-heidelberg.de/titel/68485528   QR-Code
zum Seitenanfang