Fluid inclusions in mantle and lower crustal xenoliths from the Simcoe volcanic field, Washington

1999 ◽  
Vol 154 (1-4) ◽  
pp. 83-95 ◽  
Author(s):  
Inci Evren Ertan ◽  
William P Leeman
Keyword(s):  
Fluid Inclusions ◽  
Volcanic Field ◽  
Crustal Xenoliths ◽  
Lower Crustal

scholarly journals Lower crustal zircons reveal Neogene metamorphism beneath the Pannonian Basin (Hungary)

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Hilary Downes ◽  
Andrew Carter ◽  
Richard Armstrong ◽  
Gabor Dobosi ◽  
Antal Embey-Isztin
Keyword(s):  
Pannonian Basin ◽  
Granulite Facies ◽  
Blocking Temperature ◽  
Late Devonian ◽  
Alkali Basalts ◽  
Volcanic Deposits ◽  
Eruption Age ◽  
Crustal Xenoliths ◽  
Lower Crustal ◽  
Variscan Basement

AbstractNeogene alkaline intraplate volcanic deposits in the Pannonian Basin (Hungary) contain many lower crustal granulite-facies xenoliths. U-Pb ages have been determined for zircons separated from a metasedimentary xenolith, using LA-ICPMS and SHRIMP techniques. The zircons show typical metamorphic characteristics and are not related to the hostmagmatism. The oldest age recorded is late Devonian, probably related to Variscan basement lithologies. Several grains yield Mesozoic dates for their cores, which may correspond to periods of orogenic activity. Most of the zircons show young ages, with some being Palaeocene-Eocene, but the majority being younger than 30Ma. The youngest zircons are Pliocene (5.1-4.2 Ma) and coincide with the age of eruptions of the host alkali basalts. Such young zircons, so close to the eruption age, are unusual in lower crustal xenoliths, and imply that the heat flow in the base of the Pannonian Basin was sufficiently high to keep many of them close to their blocking temperature. This suggests that metamorphism is continuing in the lower crust of the region at the present day.

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