Petrographical and geochemical changes in Bosnian stalagmites and their palaeo-environmental significance
Veronica Chiarini
(1, 2)
,
Isabelle Couchoud
(2)
,
Russell N. Drysdale
(3, 2)
,
Petra Bajo
(3)
,
Simone Milanolo
(4)
,
Silvia Frisia
(5)
,
Alan Greig
,
John Hellstrom
(3)
,
Jo de Waele
(1)
Isabelle Couchoud
- Fonction : Auteur
- PersonId : 8420
- IdHAL : isabelle-couchoud
- ORCID : 0000-0002-7166-9575
- IdRef : 115103139
Alan Greig
- Fonction : Auteur
Résumé
Detailed petrographic observations have been coupled with trace element and δ13C - δ18O analyses in order to investigate their dynamics in two Holocene Bosnian speleothems. The potential of this multiproxy approach in providing a means to extract palaeo-environmental information from stalagmites whose stable isotope signals are noisy and without obvious trends has been tested. The studied stalagmites are mostly characterized by columnar microcrystalline fabric. At the sub-millimetre scale of lamination, different microcrystalline columnar sub-types (open and closed) have been detected and classified on the basis of the observed porosity and the crystallite size. The presence of variations in crystallite arrangement at the lamina scale suggests the occurrence of small-scale environmental changes recorded in the studied samples. A positive correlation was found found between Mg concentration, δ13C and fabric variations, while a negative correlation relates those parameters with Sr concentration. Both δ13C and fabric changes appear to be directly related to changes in hydrology. The detailed observation of calcite fabrics combined with stable isotope and trace element profiles allowed for the interpretation of the conditions under which the speleothems were deposited.
Domaines
Milieux et Changements globaux Biodiversité et Ecologie Ingénierie de l'environnement Environnement et Société GéographieFormat du dépôt | Notice |
---|---|
Type de dépôt | Article dans une revue |
Résumé |
en
Detailed petrographic observations have been coupled with trace element and δ13C - δ18O analyses in order to investigate their dynamics in two Holocene Bosnian speleothems. The potential of this multiproxy approach in providing a means to extract palaeo-environmental information from stalagmites whose stable isotope signals are noisy and without obvious trends has been tested. The studied stalagmites are mostly characterized by columnar microcrystalline fabric. At the sub-millimetre scale of lamination, different microcrystalline columnar sub-types (open and closed) have been detected and classified on the basis of the observed porosity and the crystallite size. The presence of variations in crystallite arrangement at the lamina scale suggests the occurrence of small-scale environmental changes recorded in the studied samples. A positive correlation was found found between Mg concentration, δ13C and fabric variations, while a negative correlation relates those parameters with Sr concentration. Both δ13C and fabric changes appear to be directly related to changes in hydrology. The detailed observation of calcite fabrics combined with stable isotope and trace element profiles allowed for the interpretation of the conditions under which the speleothems were deposited.
|
Titre |
en
Petrographical and geochemical changes in Bosnian stalagmites and their palaeo-environmental significance
|
Auteur(s) |
Veronica Chiarini
1, 2
, Isabelle Couchoud
2
, Russell N. Drysdale
3, 2
, Petra Bajo
3
, Simone Milanolo
4
, Silvia Frisia
5
, Alan Greig
, John Hellstrom
3
, Jo de Waele
1
1
UNIBO -
Alma Mater Studiorum Università di Bologna = University of Bologna
( 30978 )
- Via Zamboni, 33 - 40126 Bologna
- Italie
2
EDYTEM -
Environnements, Dynamiques et Territoires de Montagne
( 20150 )
- Université de Savoie, Campus scientifique, 73376 Le Bourget du Lac cedex
- France
3
University of Melbourne
( 306322 )
- Parkville VIC 3010
- Australie
4
hydro engineering institute, Sarajevo
( 544772 )
- Bosnie-Herzégovine
5
Newcastle University [Newcastle]
( 252912 )
- Newcastle upon Tyne NE1 7RU
- Royaume-Uni
|
Comité de lecture |
Oui
|
Nom de la revue |
|
Langue du document |
Anglais
|
Volume |
46
|
Numéro |
1
|
Page/Identifiant |
33 - 49
|
Date de publication |
2017-01
|
Audience |
Internationale
|
Vulgarisation |
Non
|
Éditeur commercial |
|
Référence interne |
|
Domaine(s) |
|
DOI | 10.5038/1827-806X.46.1.2057 |
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