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• W1527125067 abstract "The Sag-hegy volcanic complex is located in the little Hungarian plain volcanic field (LHPVF). An 39 Ar/ 40 Ar geochronolgy gave an isochron age of 5.42 ± 0.06 My for the Saghegy (Wijbrans et al. 2004). Evolution of the volcano included two clearly distinct events. At first, ascending magma entered meteoric water in a fluvio-lacustrine environment. Fuel-coolant interaction (FCI) of water (water saturated sediment) and magma led to the formation of a phreatomagmatic tuff ring. After water supply was used up the interior of the tephra ring was filled by a lava lake. Locally, the tuff ring wall collapsed and subsequently lava was able to flow out of the tuff ring. Due to intensive quarrying most of the effusive rocks have been removed, giving excellent insight to emplacement processes of feeder dykes, sills, and lava lake remnant (Martin and Nemeth 2004). Pyroclastic rocks include massive and bedded units of lapilli stone, lapilli tuff/ tuff as well as pyroclastic breccias. Varying proportions of accidental lithic clasts indicate excavation of basement rocks during the eruption. Juvenile clasts comprise mainly of angular, blocky sideromelane glass sharts with nearly equent shapes and a minor proportion of tachylite. A high amount of water within the system is evidenced by soft sediment deformation and accretionary lapilli in the pyroclastic bedsets. Dune and antidune bedding, chute and pool structures grading, and sorting features suggest that the tuff ring was gradually built up by base surge and intercalated fallout deposits. Subsequent to the phreatomagmatic stage the inner crater has been filled with a lava lake in which morphology was determined by the tephra deposits. At contacts to the pyroclastics a chilled margin of several centimeter thickness is developed which shows platty (onion shaped) jointing. A high number of dykes and sills were injected into adjacent bedsets. These shallow intrusive bodies can be found throughout the whole complex truncating and dissecting the pyroclastic units. In cases where pyroclastic units comprised a high amount of water this included even mingling with the wet tephra, leading to the formation of peperites. The uppermost units were represented by thick lava flows, which covered all underlying units. These rocks were quarried out except for a large strombolian spatter cone which is now exposed at the uppermost level of the quarry as a big sliced remnant including its large multiple feeder dyke. This setting offers a perfect opportunity to study the relationship between dyke and sill enplacement" @default.
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• W1527125067 date "2006-01-01" @default.
• W1527125067 modified "2023-09-27" @default.
• W1527125067 title "Magnetic characteristics of the Ság-hegy volcanic complex, little Hungarian Plain" @default.
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