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Altered volcanic ash as an indicator of marine environment, reflecting pH and sedimentation rate — Example from the Ordovician Kinnekulle bed of Baltoscandia

Published online by Cambridge University Press:  01 January 2024

Tarmo Kiipli ,
Enli Kiipli ,
Toivo Kallaste ,
Rutt Hints ,
Peeter Somelar  and
Kalle Kirsimäe
Tarmo Kiipli*
Affiliation:
Institute of Geology at Tallinn University of Technology, Ehitajate tee 5 19086 Tallinn, Estonia
Enli Kiipli
Affiliation:
Institute of Geology at Tallinn University of Technology, Ehitajate tee 5 19086 Tallinn, Estonia
Toivo Kallaste
Affiliation:
Institute of Geology at Tallinn University of Technology, Ehitajate tee 5 19086 Tallinn, Estonia
Rutt Hints
Affiliation:
Institute of Geology, University of Tartu, Vanemuise 46 51014 Tartu, Estonia
Peeter Somelar
Affiliation:
Institute of Geology, University of Tartu, Vanemuise 46 51014 Tartu, Estonia
Kalle Kirsimäe
Affiliation:
Institute of Geology, University of Tartu, Vanemuise 46 51014 Tartu, Estonia
*
*E-mail address of corresponding author: tarmo.kiipli@gi.ee
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Abstract

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The composition of altered volcanic ash of the Late Ordovician Kinnekulle bed was studied in geological sections of the Baltic Paleobasin. The composition of altered ash varies with paleosea depth from northern Estonia to Lithuania. The ash bed in shallow shelf limestones contains an association of illite-smectite (I-S) and K-feldspar, with the K2O content ranging from 7.5 to 15.3%. The limestone in the transition zone between shallow- and deep-shelf environments contains I-S-dominated ash with K2O content from 6.0 to 7.5%. In the deep-shelf marlstone and shale, the volcanic ash bed consists of I-S and kaolinite with a K2O content ranging from 4.1 to 6.0%. This shows that authigenic silicates from volcanic ash were formed during the early sedimentary-diagenetic processes. The composition of the altered volcanic ash can be used as a paleoenvironmental indicator showing the pH of the seawater or porewater in sediments as well as the sedimentation rate.

Keywords

BaltoscandiaK-bentoniteKinnekulleMarine EnvironmentOrdovicianpHSedimentation RateVolcanic Ash
Type
Research Article
Information
Clays and Clay Minerals , Volume 55 , Issue 2 , April 2007 , pp. 177 - 188
Copyright
Copyright © 2007, The Clay Minerals Society

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