Early Pleistocene climatic cycles in continental deposits of the Lesser Caucasus of Armenia inferred from palynology, magnetostratigraphy, and 40Ar/39Ar dating
Sebastien Joannin
(1, 2, 3)
,
Jean-Jacques Cornee
(4)
,
Philippe Münch
(4)
,
Michel Fornari
(5)
,
Iuliana Vasiliev
(6)
,
Wout Krijgsman
(6)
,
Samuel Nahapetyan
(7)
,
Ivan Gabrielyan
(7)
,
Vincent Ollivier
(8)
,
Paul Roiron
(9)
,
Christine Chataigner
(7)
1
LCE -
Laboratoire Chrono-environnement (UMR 6249)
2 PEPS - PaleoEnvironnements et PaleobioSphere
3 MSHE - Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124)
4 Géosciences Montpellier
5 GEOAZUR 6526 - Géoazur
6 Universiteit Utrecht / Utrecht University [Utrecht]
7 Archéorient - ARCHEORIENT - Environnements et sociétés de l'Orient ancien
8 LAMPEA - Laboratoire méditerranéen de préhistoire Europe-Afrique
9 CBAE - Centre de Bio-Archéologie et d'Ecologie
2 PEPS - PaleoEnvironnements et PaleobioSphere
3 MSHE - Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124)
4 Géosciences Montpellier
5 GEOAZUR 6526 - Géoazur
6 Universiteit Utrecht / Utrecht University [Utrecht]
7 Archéorient - ARCHEORIENT - Environnements et sociétés de l'Orient ancien
8 LAMPEA - Laboratoire méditerranéen de préhistoire Europe-Afrique
9 CBAE - Centre de Bio-Archéologie et d'Ecologie
Sebastien Joannin
- Fonction : Auteur
- PersonId : 19986
- IdHAL : sebastien-joannin
- ORCID : 0000-0001-8345-9252
- IdRef : 11417038X
Jean-Jacques Cornee
- Fonction : Auteur
- PersonId : 183306
- IdHAL : jean-jacques-cornee
- ORCID : 0000-0003-0542-098X
- IdRef : 080266827
Philippe Münch
- Fonction : Auteur
- PersonId : 753493
- IdHAL : philippe-munch
- ORCID : 0000-0003-4616-8039
- IdRef : 157417069
Vincent Ollivier
- Fonction : Auteur
- PersonId : 753184
- IdHAL : vincent-ollivier-cnrs
- ORCID : 0000-0002-4326-6891
- IdRef : 112254934
Christine Chataigner
- Fonction : Auteur
- PersonId : 832454
Résumé
Plio-Pleistocene diatomitic sequences in the Shamb paleo-lake (South Armenia, Lesser Caucasus) offer a rare opportunity to give new insights on the paleo-climate of Western Asia. We present an integrated palynological, 40Ar/39Ar geochronologic and magnetostratigraphic study for the most complete section in the sedimentary deposits of the Shamb paleo-lake. 40Ar/39Ar dating of two volcaniclastic layers provided ages of 1.24 ± 0.03 and 1.16 ± 0.02 Ma (2. Magnetostratigraphic data show that the entire Shamb section is of reversed polarity which, combined with 40Ar/39Ar dating, suggests that the entire section correlates with part of the Matuyama period (1.785-1.070 Ma). Pollen assemblages and macroremains diversity clearly show an alternation of glacial and interglacial phases. Age calibrations and accumulation rate extrapolation allow a direct correlation of climate changes with the global isotopic curve, and show that the Shamb section probably ranges from approximately 1.300 to 1.080 Ma (marine isotopic stages 40 to 31). The vegetation of the Lesser Caucasus developed in a mosaic pattern in a Pleistocene continental, mostly arid climate, comparable to the present-day climate. The observed vegetation changes record a dominant climate response to the obliquity orbital parameter, but the influence of precession could not be established from the Shamb data. Pollen and macroflora both indicate that glacial periods were cold and dry and that interglacials were warm with local humidity. The early Pleistocene climatic model for Western Asia is thus similar to the climatic model for the Mediterranean area.
Domaines
Sciences de l'environnement Sciences de la Terre Interfaces continentales, environnement Milieux et Changements globaux Etudes de l'environnementFormat du dépôt | Notice |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Early Pleistocene climatic cycles in continental deposits of the Lesser Caucasus of Armenia inferred from palynology, magnetostratigraphy, and 40Ar/39Ar dating
|
Résumé |
en
Plio-Pleistocene diatomitic sequences in the Shamb paleo-lake (South Armenia, Lesser Caucasus) offer a rare opportunity to give new insights on the paleo-climate of Western Asia. We present an integrated palynological, 40Ar/39Ar geochronologic and magnetostratigraphic study for the most complete section in the sedimentary deposits of the Shamb paleo-lake. 40Ar/39Ar dating of two volcaniclastic layers provided ages of 1.24 ± 0.03 and 1.16 ± 0.02 Ma (2. Magnetostratigraphic data show that the entire Shamb section is of reversed polarity which, combined with 40Ar/39Ar dating, suggests that the entire section correlates with part of the Matuyama period (1.785-1.070 Ma). Pollen assemblages and macroremains diversity clearly show an alternation of glacial and interglacial phases. Age calibrations and accumulation rate extrapolation allow a direct correlation of climate changes with the global isotopic curve, and show that the Shamb section probably ranges from approximately 1.300 to 1.080 Ma (marine isotopic stages 40 to 31). The vegetation of the Lesser Caucasus developed in a mosaic pattern in a Pleistocene continental, mostly arid climate, comparable to the present-day climate. The observed vegetation changes record a dominant climate response to the obliquity orbital parameter, but the influence of precession could not be established from the Shamb data. Pollen and macroflora both indicate that glacial periods were cold and dry and that interglacials were warm with local humidity. The early Pleistocene climatic model for Western Asia is thus similar to the climatic model for the Mediterranean area.
|
Auteur(s) |
Sebastien Joannin
1, 2, 3
, Jean-Jacques Cornee
4
, Philippe Münch
4
, Michel Fornari
5
, Iuliana Vasiliev
6
, Wout Krijgsman
6
, Samuel Nahapetyan
7
, Ivan Gabrielyan
7
, Vincent Ollivier
8
, Paul Roiron
9
, Christine Chataigner
7
1
LCE -
Laboratoire Chrono-environnement (UMR 6249)
( 57629 )
- 16, route de Gray - 25030 Besançon Cedex
- France
2
PEPS -
PaleoEnvironnements et PaleobioSphere
( 172603 )
- Campus de la Doua, Bâtiment GEODE 2 rue Raphaël Dubois 69622 Villeurbanne cedex
- France
3
MSHE -
Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124)
( 2228 )
- 32-36, rue Mégevand 25030 BESANCON CEDEX
- France
4
Géosciences Montpellier
( 24484 )
- Université de Montpellier Campus Triolet cc060 Place Eugène Bataillon 34095 Montpellier Cedex05
- France
5
GEOAZUR 6526 -
Géoazur
( 179699 )
- Bât 4, 250 rue Albert Einstein Les Lucioles 1, Sophia Antipolis 06560 VALBONNE
- France
6
Universiteit Utrecht / Utrecht University [Utrecht]
( 300572 )
- Heidelberglaan 8, 3584 CS Utrecht
- Pays-Bas
7
Archéorient -
ARCHEORIENT - Environnements et sociétés de l'Orient ancien
( 619 )
- Maison de l'Orient et de la Méditerranée Jean-Pouilloux 7 rue Raulin 69365 LYON Cedex 07
- France
8
LAMPEA -
Laboratoire méditerranéen de préhistoire Europe-Afrique
( 208163 )
- MMSH 5 Rue du château de l'Horloge BP 647 13094 AIX EN PROVENCE CEDEX 2
- France
9
CBAE -
Centre de Bio-Archéologie et d'Ecologie
( 39847 )
- Institut de Botanique 163 rue Auguste Broussonnet 34090 Montpellier
- France
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Date de publication |
2010-01-27
|
Volume |
291
|
Numéro |
1-4
|
Page/Identifiant |
149-158
|
Audience |
Internationale
|
Domaine(s) |
|
Référence interne |
|
Financement |
|
Mots-clés |
en
climate, Early Pleistocene, Western Asia, Caucasus paleovegetation, 40Ar/39Ar dating, magnetostratigraphy, climate.
|
DOI | 10.1016/j.epsl.2010.01.007 |
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