Petrology and geodynamical interpretation of mantle xenoliths from Late Cretaceous lamprophyres, Villany Mts (S Hungary)

作者：Nedli Zsuzsanna; Toth Tivadar M; Downes Hilary; Csaszar Geza; Beard Andrew; Szabo Csaba^*

来源：Tectonophysics, 2010, 489(1-4): 43-54.

DOI：10.1016/j.tecto.2010.03.013

• Villany Mts
• Tisza unit
• Mantle xenolith
• Thermobarometry
• Geodynamics

A Late Cretaceous lamprophyre dyke in the Villany Mts (S Hungary), situated in the Tisza unit, contains abundant spinel Iherzolite xenoliths with porphyroclastic textures. Mineral chemistry suggests a relatively fertile mantle, which experienced only 5-7% melt extraction. Differences in porphyroclast and neoblast chemistry and thermobarometric calculations suggest that the mantle section represented by the xenoliths experienced recrystallization at lower PT as it was transported to shallow mantle depths close to the plagioclase stability field, followed by later relaxation. Based on volcanological and sedimentological constraints from the Villany Mts and the neighboring Mecsek Mts, we suggest that the uprise of the subcontinental mantle material was related to a Cretaceous rifting event and lithospheric deformation of the southwestern part of the Tisza unit. Mantle upwelling and formation of lamprophyre melts can be related to generation or reactivation of deep fractures of the lithosphere, during a period of lithospheric extension between the major nappe emplacements (Albian-Cenomanian and Paleocene) of the region.

• 出版日期2010-6-20