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.

Basic information

Original name

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

Authors

PUTIS, Marian (703 Slovakia, guarantor), Yue-Heng YANG (156 China), Tomáš VACULOVIČ (203 Czech Republic, belonging to the institution), Matúš KOPPA (703 Slovakia), Xian-Hua LI (156 China) and Pavel UHER (703 Slovakia)

Edition

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

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10406 Analytical chemistry

Country of publisher

Slovakia

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 1.358

RIV identification code

RIV/00216224:14310/16:00093827

Organization unit

Faculty of Science

DOI

UT WoS

000375774300002

Keywords in English

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

Tags

Tags

International impact
Změněno: 9/4/2017 11:33, Ing. Andrea Mikešková

Abstract

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.

Links

LQ1601, research and development project
Name: CEITEC 2020 (Acronym: CEITEC2020)
Investor: Ministry of Education, Youth and Sports of the CR