Geochemical indicators of a biogenic component in source materials of moldavites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F22%3A00563661" target="_blank" >RIV/67985891:_____/22:00563661 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389005:_____/22:00563499

Výsledek na webu

<a href="http://dx.doi.org/10.1130/2021.2553(26)" target="_blank" >http://dx.doi.org/10.1130/2021.2553(26)</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1130/2021.2553(26)" target="_blank" >10.1130/2021.2553(26)</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Geochemical indicators of a biogenic component in source materials of moldavites

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Geochemical indicators of a biogenic component in source materials of moldavites

Popis výsledku anglicky

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.

Druh

C - Kapitola v odborné knize

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název knihy nebo sborníku

In the Footsteps of Warren B. Hamilton: New Ideas in Earth Science

ISBN

978-08-1372-553-6

Počet stran výsledku

12

Strana od-do

335-346

Počet stran knihy

434

Název nakladatele

The Geological Society of America

Místo vydání

Boulder

Kód UT WoS kapitoly

000891146500027