The new data on the origin of the Patom Crater (East Siberia)

It has been found that the origin of the Patom Crater is related to endogenous processes with the main role played by deep flow of fluid components, which determine formation of the ejecta cone at about 500 years ago or more. This is evidenced by the zonal structure of the crater and geochemical pec...

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Bibliographic Details
Published in:Doklady earth sciences 2011-10, Vol.440 (2), p.1391-1395
Main Authors: Antipin, V. S., Fedorov, A. M., Dril’, S. I., Voronin, V. I.
Format: Article
Language:English
Subjects:
Breccia
Carbon dioxide
Craters
Earth and Environmental Science
Earth science
Earth Sciences
Enrichment
Fluid dynamics
Fluid flow
Fluids
Geochemistry
Geology
Rare earth elements
Rocks
Sandstone
Strontium
Terrigenous sediments
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Summary:It has been found that the origin of the Patom Crater is related to endogenous processes with the main role played by deep flow of fluid components, which determine formation of the ejecta cone at about 500 years ago or more. This is evidenced by the zonal structure of the crater and geochemical peculiarities of rocks, caused by the long formation time for particular zones. Sandstone and schist blocks that were included into eruptive breccia within the crater were affected by gaseous or fluid components and intensively carbonized. During carbonatization, these rocks within the crater were being enriched in Ca and Sr, but the shares of the 87 Sr and, consequently, 87 Sr/ 86 Sr ratio in them abruptly decrease. This is explained by the influence of deep fluids on terrigenous rocks, which were initially depleted in the radiogenic strontium isotope and might flow from a magmatic source with a low 87 Sr/ 86 Sr ratio. However, these fluids were enriched in CO2 and transported significant quantities of Sr, which led to enrichment of all terrigenous rocks in the crater in this element. The discovery of individual sandstone blocks with high concentrations of summarized rare earth elements (up to 557 g/t) and higher Sr and Ba contents among the fragments of host stratum within the Patom Crater allows us to suppose that there is a magmatic source enriched in fluid components at depths. The effect of the active fluid phase with low strontium isotopic ratios on rocks during the Patom Crater formation might lead to an abrupt decrease in values of the initial 87 Sr/ 86 Sr ratio in carbonized sandstones and schists.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X11100187