Loess Letter 2016

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The new LL is here now!

LL vol. 73. “The Secondary Carbonate issue”

“Secondary carbonates are sensitive paleoenvironmental indicators: not just
their stable carbon and oxygen isotope composition provides information about
former environmental conditions, but their morphology and distribution along
the sequence.
Primary carbonate content of loess derives from calcite and dolomite crystals,
which are settling down contemporaneously with the mineral dust – and
these crystals are responsible for the cementation of mineral grains during
sedimentation.
Clay bridges play a role in the fixation of settling dust and in the impregnation
of the matrix, besides biological loess crusts.
The formation of secondary carbonates is due to the vertical, horizontal or in situ
resettlement of primary carbonates in the soil-sedimentary environment: this
process is connected with the flow of bicarbonate solutions, biomineralization
processes and the weathering of calcium-bearing minerals and mollusc shells.”

Based on:

Barta, G. 2016. Analysis of secondary carbonates from the young
loess-paleosol sequences of the Carpathian Basin – especially regarding their
paleoenvironmental role. PhD Dissertation, Eötvös Loránd University Budapest,
DOI: 10.15476/ELTE.2016.044.)

Download link:

LL_2016

Published by

Balazs Bradak

Keywords: paleomagnetism, magnetic fabric, paleopedology, (loess) stratigraphy, environment reconstruction and planetology

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