Insight into the Evolution of Lithosphere beneath Pannonian Basin Through Studying H2O Content in NAMs from Füzes-Tó Upper Mantle Xenoliths (Hungary)
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Tartalom: http://real.mtak.hu/29464/
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published



Type = Conference or Workshop Item
Cím:
Insight into the Evolution of Lithosphere beneath Pannonian Basin Through Studying H2O Content in NAMs from Füzes-Tó Upper Mantle Xenoliths (Hungary)
Létrehozó:
Pintér, Zsanett
Kovács, István János
Szabó, Csaba
Dátum:
2015
Téma:
QE02 Geochemistry / geokémia
QE03 Geodynamics / geodinamika
QE06 Petrology. Petrography / kőzettan, petrográfia
Tartalmi leírás:
The youngest xenolith-bearing alkali basaltic outcrop
(Füzes-tó) in Bakony-Balaton Highland Volcanic Field
(BBHVF) in the central Carpathian-Pannonian region (CPR)
includes peridotite xenoliths with the highest diverse textures
from the BBHVF.
Based on prior studies [1], a two-layered continental
lithospheric mantle is present beneath the region: 1) shallow
lithospheric mantle portion with fine-grained texture from the
MOHO to 40 km depth, and 2) deeper, coarse-grained layer
between 40 km depth and the present LAB boundary. The
deeper layer could represent a juvenile lithosphere which was
transformed form asthenosphere following the Miocene
extension event. It was also proposed that tabular equigranular
textures xenoliths may form a thin horizon which may separate
these two layers [2].
Six representative and well characterized spinel peridotite
xenoliths were selected for detailed FTIR study, covering the
two mantle domains and, in addition, three tabular
equigranular textured xenoliths from Füzes-tó are also
inlcuded. H2O content of the nominally anhydrous minerals
(NAMs) were calculated from avaraged unpolarized FTIR
spectra of each NAM [3]. Xenoliths from shallow layer show
generally low bulk H2O content (6-13 ppm), wheares the
xenoliths from juvenile deep mantle have higher bulk H2O
contents (~20 ppm). The tabular equigranular textured
xenoliths from the horizon that separate the two main domains
show the most elevated H2O concentrations in bulk NAM
(~25 ppm). The higher water content of the deeper layer may
be explained by its asthenospheric origin due to higher water
activity presumably induced by the instability of pargasitic
amphibole.
Típus:
Conference or Workshop Item
PeerReviewed
Formátum:
text
Azonosító:
Pintér, Zsanett and Kovács, István János and Szabó, Csaba (2015) Insight into the Evolution of Lithosphere beneath Pannonian Basin Through Studying H2O Content in NAMs from Füzes-Tó Upper Mantle Xenoliths (Hungary). In: Goldschmidt 2015, 16?21 Aug 2015., Prague.
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