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Vermes
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Primary terms
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absolute age (6)
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Africa
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Southern Africa
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Asia
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Far East
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Gujarat India
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Amba Dongar (1)
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Kerala India
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Maharashtra India (1)
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Northeastern India
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Middle East
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Iran (2)
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Siberian Platform
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Aldan Shield (1)
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Stanovoy Range (1)
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Vindhyan Basin (1)
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Atlantic Ocean
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Amazon Fan (1)
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Gulf of Mexico (1)
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North Sea
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carbon
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Cenozoic
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Pleistocene
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upper Pleistocene
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upper Quaternary (1)
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Tertiary
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Asmari Formation (1)
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upper Miocene
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Germany
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Italy
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Western Europe
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France
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
C-13
The Palaeo-Productivity Signals Chronicled from the Buxa Formation, North-East Lesser Himalaya, India Available to Purchase
Marine redox dynamics and biotic response to the mid-Silurian Ireviken Extinction Event in a mid-shelf setting Open Access
Alkenone-derived estimates of Cretaceous p CO 2 Available to Purchase
Clumped and in situ carbon and oxygen isotopes of calcite as tracers for oxidation of hydrocarbons in deep siliciclastic strata Available to Purchase
The distribution of carbonate in apatite: The environment model Available to Purchase
Multidisciplinary Analysis to Interpret the Palaeoclimate and Depositional Environment of the Late Paleozoic Post-glacial Sediments from Wardha Basin, Maharashtra, Central India Available to Purchase
Evolutionary, paleoecological, and biostratigraphic implications of the Ediacaran-Cambrian interval in West Gondwana Available to Purchase
Mass occurrence of echinoids in an Oligocene hydrocarbon-seep limestone from the Olympic Peninsula, Washington State, USA Open Access
Geochemistry of the Cretaceous Mowry Shale in the Wind River Basin, Wyoming Open Access
Formation of authigenic carbonates contributed by sulfate- and metal-driven anaerobic oxidation of methane in the northern Okinawa Trough, East China Sea Available to Purchase
Messinian seep-carbonates marking the transition to the evaporite deposits in the Romagna sector of the northern Apennines (Italy) Available to Purchase
Geochemical indicators of a biogenic component in source materials of moldavites Available to Purchase
ABSTRACT Formation of the Central European tektites, known as moldavites, has been associated with a large meteorite impact in southern Germany 14.8 m.y. ago. The geochemical link between moldavites and their source materials, and the processes of their possible chemical differentiation still remain uncertain. Some differences in chemical composition between moldavites and sediments of corresponding age from the surroundings of the Ries crater could be explained by a hypothesis according to which biomass covering the pre-impact area contributed to the source materials. In a comparison of the geochemical compositions of a large representative set of moldavites and suitable Ries sediments, enrichment in elements K, Ca, Mg, and Mn and depletion of Na in moldavites, similar to redistribution of these elements during their transfer from soil to plants, could indicate the unconventional biogenic component in moldavite source materials. Simple mixing calculations of the most suitable Ries sediments and a model biogenic component represented by burned biomass residue are presented. The plausibility of the estimated biomass contribution considering reconstructions of the middle Miocene paleoenvironment in the pre-impact Ries area is discussed. No significant vapor fractionation is required to explain the observed variability of moldavite chemical composition.