J 2016

Perovskite, reaction product of a harzburgite with Jurassic-Cretaceous accretionary wedge fluids (Western Carpathians, Slovakia): evidence from the whole-rock and mineral trace element data

PUTIS, Marian, Yue-Heng YANG, Tomáš VACULOVIČ, Matúš KOPPA, Xian-Hua LI et. al.

Základní údaje

Originální název

Perovskite, reaction product of a harzburgite with Jurassic-Cretaceous accretionary wedge fluids (Western Carpathians, Slovakia): evidence from the whole-rock and mineral trace element data

Autoři

PUTIS, Marian (703 Slovensko, garant), Yue-Heng YANG (156 Čína), Tomáš VACULOVIČ (203 Česká republika, domácí), Matúš KOPPA (703 Slovensko), Xian-Hua LI (156 Čína) a Pavel UHER (703 Slovensko)

Vydání

Geologica Carpathica, Bratislava, Earth Science Institute of the Slowak Academy of Sciences, 2016, 1335-0552

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10406 Analytical chemistry

Stát vydavatele

Slovensko

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 1.358

Kód RIV

RIV/00216224:14310/16:00093827

Organizační jednotka

Přírodovědecká fakulta

DOI

UT WoS

000375774300002

Klíčová slova anglicky

perovskite; serpentinization; rodingitization; ICP-MS; LA-ICP-MS; Western Carpathians accretionary wedge

Štítky

Příznaky

Mezinárodní význam
Změněno: 9. 4. 2017 11:33, Ing. Andrea Mikešková

Anotace

V originále

Perovskite (Prv) was discovered in an abyssal harzburgite from a "melange" type blueschist-bearing accretionary wedge of the Western Carpathians (Meliata Unit, Slovakia). Perovskite-1 formation in serpentinized orthopyroxene may be simplified by the mass-balance reaction: Ca2Si2O6 (Ca-pyroxene-member)+2Fe(2)TiO(4) (ulvospinel molecule in spinel)+2H(2)O+O-2=2CaTiO(3) (Prv)+2SiO(2)+4FeOOH (goethite). Perovskite-2 occurs in a chlorite-rich blackwall zone separating serpentinite and rodingite veins, and in rodingite veins alone. The bulk-rock trace-element patterns suggest negligible differences from visually and microscopically less ("core") to strongly serpentinized harzburgite due to serpentinization and rodingitization: an enrichment in LREE(La,Ce), Cs, +/- Ba, U, Nb, Pb, As, Sb, +/- Nd and Li in comparison with HREE, Rb and Sr. The U/Pb perovskite ages at similar to 135 Ma are interpreted to record the interaction of metamorphic fluids with harzburgite blocks in the Neotethyan Meliatic accretionary wedge. Our LA-ICP-MS mineral study provides a complex view on trace element behaviour during the two stages of rodingitization connected with Prv genesis. The positive anomalies of Cs, U, Ta, Pb, As, Sb, Pr and Nd in Cpx, Opx and Ol are combined with the negative anomalies of Rb, Ba, Th, Nb and Sr in these minerals. The similar positive anomalies of Cs, U, Ta, +/- Be, As, Sb found in typical serpentinization and rodingitization minerals, with variable contents of La, Ce and Nd, and negative anomalies of Rb, Ba, Th, Nb and Sr suggest involvement of crustal fluids during MP-LP/LT accretionary wedge metamorphism. LA-ICP-MS study revealed strong depletion in LREE from Prv-1 to Prv-2, and a typically negative Eu (and Ti) anomaly for Prv-1, while a positive Eu (and Ti) anomaly for Prv-2. Our multi-element diagram depicts enrichment in U, Nb, La, Ce, As, Sb, Pr, Nd and decreased Rb, Ba, Th, Ta, Pb, Sr, Zr in both Prv generations. In general, both Prv generations are very close to the end-member composition. In spite of low concentrations of isomorphic constituents, Prv-1 and Prv-2 display the (A)(La,Ce)(3+)+(B)(Fe,Cr)(3+)=Ca-A(2+)+Ti-B(4+) heterovalent couple substitution. A decrease of ferric iron in Prv-2 indicates increasing reduction conditions during rodingitization.

Návaznosti

LQ1601, projekt VaV
Název: CEITEC 2020 (Akronym: CEITEC2020)
Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, CEITEC 2020