scholarly journals Extremely low structural hydroxyl contents in upper mantle xenoliths from the Nógrád-Gömör Volcanic Field (northern Pannonian Basin): Geodynamic implications and the role of post-eruptive re-equilibration

2019 ◽  
Vol 507 ◽  
pp. 23-41 ◽  
Author(s):  
Levente Patkó ◽  
Nóra Liptai ◽  
István János Kovács ◽  
László Előd Aradi ◽  
Qun-Ke Xia ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Pannonian Basin ◽  
Volcanic Field ◽  
Mantle Xenoliths ◽  
Structural Hydroxyl

‘Water’ content as a tool to estimate rheological differences in the lithosphere of young extensional basins

2020 ◽  
Author(s):  
Nóra Liptai ◽  
Thomas P. Lange ◽  
Levente Patkó ◽  
Márta Berkesi ◽  
Csaba Szabó ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Upper Mantle ◽  
Lithospheric Mantle ◽  
Pannonian Basin ◽  
Volcanic Field ◽  
Mantle Xenoliths ◽  
Self Healing ◽  
Alkali Basalts ◽  
Extensional Basin ◽  
Marginal Areas

<p>Nominally anhydrous minerals in the lithospheric mantle, such as olivine and pyroxenes can host a small amount (tens to hundreds of ppm) of structurally bound hydroxyl (‘water’). Numerous studies pointed out that water has a strong effect on the rheological properties of the lithospheric mantle, such as melting temperature, electrical conductivity, viscosity and seismic wave propagation speed. Water content of mantle xenoliths can thus be used to estimate such rheological properties which can then be compared with geophysical observations.</p><p>In this study we present effective viscosities and electrical resistivities calculated with the use of ‘water’ contents of upper mantle xenoliths from the Carpathian-Pannonian region (CPR). The CPR is a young extensional basin in Central Europe, where intraplate alkali basalts sampled the lithosphere in five areas, including locations from both the central and marginal regions. ‘Water’ contents are generally higher in xenoliths from the marginal areas compared with those from the central areas of the CPR, due to significant hydrogen loss during the extension in the Miocene (Patkó et al., 2019). It is demonstrated that due to the different ‘water’ contents, the lithospheric mantle in the central areas can be characterized with higher effective viscosity and electrical resistivity, and thus can be considered as more rigid than the marginal areas. This relative rigidity induced by lithospheric thinning may be a general feature of extensional basin systems worldwide, and can be regarded as a ‘self-healing’ mechanism of the extending lithosphere.</p><p> </p><p>References:</p><p>Patkó, L., Liptai, N., Kovács, I. J., Aradi, L. E., Xia, Q.-K., Ingrin, J., Mihály, J., O’Reilly, S. Y., Griffin, W. L., Wesztergom, V., Szabó, C., 2019. Extremely low structural hydroxyl contents in upper mantle xenoliths from the Nógrád-Gömör Volcanic Field (northern Pannonian Basin): Geodynamic implications and the role of post-eruptive re-equilibration. Chemical Geology, 507, 23-41.</p>

scholarly journals Metasomatism-induced wehrlite formation in the upper mantle beneath the Nógrád-Gömör Volcanic Field (Northern Pannonian Basin): Evidence from xenoliths

2020 ◽  
Vol 11 (3) ◽  
pp. 943-964 ◽  
Author(s):  
Levente Patkó ◽  
Nóra Liptai ◽  
László Előd Aradi ◽  
Rita Klébesz ◽  
Eszter Sendula ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Pannonian Basin ◽  
Volcanic Field

Amphibole lamellae formation in the upper mantle due to interaction of fluid inclusions and host minerals: a case study from Persani Mountains Volcanic Field, Transylvania

2020 ◽  
Author(s):  
Thomas Pieter Lange ◽  
Zsófia Pálos ◽  
Levente Patkó ◽  
Márta Berkesi ◽  
Nóra Liptai ◽  
...  
Keyword(s):  
Fluid Inclusion ◽  
Fluid Inclusions ◽  
Upper Mantle ◽  
Volcanic Field ◽  
Planetary Science ◽  
Mantle Xenoliths ◽  
Fluid Inclusion Study ◽  
Chemical Components ◽  
Major Element Composition ◽  
Host Mineral

<p>Amphibole is one of the most abundant ’water’-bearing minerals in the Earth’s upper mantle. Amphiboles occur as interstitial grains, lamellae within pyroxenes or as daughter minerals within fluid inclusions.  Most commonly amphibole formation is related to mantle metasomatism, where the agent has a subducted slab (e.g. Manning 2004) or an asthenospheric origin (e.g. Berkesi et al. 2019).  After the formation of fluid inclusions, a subsolidus interaction can take place where the H<sub>2</sub>O content of fluid inclusions may crystallize pargasite (e.g. Plank et al. 2016).</p><p>Here we present amphibole lamellae formation in mantle xenoliths from the Persani Mountains Volcanic Field that is interrelated to a reaction between fluid inclusions and host clinopyroxene.  Newly formed amphibole lamellae occur only in the surroundings of the fluid inclusions and grow within the host clinopyroxene in a preferred crystallographic direction.  Studied lamellae do not reach the rim of the host mineral implying that components needed for formation of amphibole lamellae in clinopyroxene could have only originated from the fluid inclusion itself.  We measured the major element composition of amphibole lamellae and host clinopyroxene (1) and used Raman spectroscopy and FIB-SEM on fluid inclusion study situated next to the lamellae (2).  Results support the hypothesis that chemical components (dominantly H<sup>+</sup>) migrated sub-solidus from the fluid inclusion into the host mineral after fluid entrapment via subsolidus interaction.  Beyond the clinopyroxene-hosted fluid inclusions, fluid inclusions in orthopyroxenes were also studied as a reference.  Our study shows that post-entrapment diffusion from a fluid inclusion into the host mineral changes the solid/fluid ratio of the mantle  which could modify the rheology of the lithospheric mantle.</p><p>Berkesi, M. et al. 2019. Chemical Geology, 508, 182-196.</p><p>Kovács et al. (2017) Acta Geodaetica et Geophysica, 52(2), 183-204.</p><p>Manning C. E. 2004. Earth and Planetary Science Letters, 223, 1-16.</p><p>Plank, T. A. et al. 2016. In AGU Fall Meeting Abstracts.</p>

Petrology of Lower Crustal and Upper Mantle Xenoliths from the Cima Volcanic Field, California

1991 ◽  
Vol 32 (1) ◽  
pp. 169-200 ◽  
Author(s):  
H. G. WILSHIRE ◽  
A. V. McGUIRE ◽  
J. S. NOLLER ◽  
B. D. TURRIN
Keyword(s):  
Upper Mantle ◽  
Volcanic Field ◽  
Mantle Xenoliths ◽  
Lower Crustal ◽  
Cima Volcanic Field

scholarly journals Multiple Metasomatism beneath the Nógrád–Gömör Volcanic Field (Northern Pannonian Basin) Revealed by Upper Mantle Peridotite Xenoliths

2017 ◽  
Vol 58 (6) ◽  
pp. 1107-1144 ◽  
Author(s):  
Nóra Liptai ◽  
Levente Patkó ◽  
István J. Kovács ◽  
Károly Hidas ◽  
Zsanett Pintér ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Pannonian Basin ◽  
Mantle Peridotite ◽  
Volcanic Field ◽  
Peridotite Xenoliths

Mafic granulites and clinopyroxenite xenoliths from the Transdanubian Volcanic Region (Hungary): implications for the deep structure of the Pannonian Basin

1990 ◽  
Vol 54 (376) ◽  
pp. 463-483 ◽  
Author(s):  
A. Embey-Isztin ◽  
H. G. Scharbert ◽  
H. Dietrich ◽  
H. Poultidis
Keyword(s):  
Upper Mantle ◽  
Pannonian Basin ◽  
Granulite Facies ◽  
Mantle Xenoliths ◽  
Geochemical Data ◽  
Moderate Pressure ◽  
Spinel Lherzolites ◽  
Volcanic Region ◽  
Lower Crustal ◽  
Granulite Xenoliths

AbstractThe Transdanubian Volcanic Region (TVR) is composed mainly of Pliocene alkali basalts, basanites, olivine basalts and olivine tholeiites, as well as rare nephelinites. The partial melting and genesis of alkali basaltic liquids is a consequence of an upwelling of the upper mantle which also caused thinning of the lithosphere and recent sinking of the Pannonian Basin.Four different types of lower crustal and upper-mantle xenoliths are found within the TVR: garnet-free and garnet-bearing granulites, clinopyroxenites and spinel lherzolites. We present mineralogical and geochemical data on granulite facies and clinopyroxenite xenoliths from three localities in the Hungarian part of the TVR (Bondoróhegy, Szentbékálla and Szigliget). It is concluded that, whilst the protoliths of the granulite facies xenoliths were tholeiitic igneous rocks and could be part of an ancient crust, the clinopyroxenite xenoliths represent recent underplating and may have formed from an alkali basaltic liquid similar to the host lava. Planar contact relations between clinopyroxenites and spinel lherzolites as observed in composite xenoliths, as well as high Al-contents in clinopyroxenes, point to a high-pressure genesis in the upper mantle for these rocks. In contrast, geobarometrical estimates yielded only a moderate pressure range characteristic of lower crustal levels for the garnet-free granulite xenoliths (7–9 kbar). Nevertheless, two-pyroxene geothermometry yielded high temperatures of equilibration (>900°C) for these xenoliths, probably caused by advective heat transfer connected with underplating and in agreement with the high present-day geothermal gradient of this region. In the Central Range localities only garnet-free granulite xenoliths occur, whereas at the border of the TVR both garnet-free and garnet-bearing granulite facies nodules are found. It is possible that the incoming of garnet is retarded by higher temperatures in the lower crust below the Central Range.It is also suggested that the difference in seismically measured crustal thickness between the Central Range and adjacent basin areas may be connected with different thermal conditions below these regions and that the seismically defined Moho and the petrological Moho do not necessarily coincide.

Significance of silicate melt pockets in upper mantle xenoliths from the Bakony–Balaton Highland Volcanic Field, Western Hungary

Lithos ◽  
2002 ◽  
Vol 61 (1-2) ◽  
pp. 79-102 ◽  
Author(s):  
Enikő Bali ◽  
Csaba Szabó ◽  
Orlando Vaselli ◽  
Kálmán Török
Keyword(s):  
Upper Mantle ◽  
Volcanic Field ◽  
Mantle Xenoliths ◽  
Silicate Melt ◽  
Melt Pockets
Sign in / Sign up

Export Citation Format

Share Document