Middle Miocene climate of southwestern Anatolia from multiple botanical proxies

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Bouchal, Johannes M.,1979-Naturhistoriska riksmuseet,Enheten för paleobiologi,Paleobiologi (author)

Middle Miocene climate of southwestern Anatolia from multiple botanical proxies

Article/chapterEnglish2018

Publisher, publication year, extent ...

2018-10-17
Vienna :European Geosciences Union (EGU),2018
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:nrm-2837
https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-2837URI
https://doi.org/10.5194/cp-14-1427-2018DOI

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Language:English
Summary in:English

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Subject category:vet swepub-contenttype
Subject category:art swepub-publicationtype

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The middle Miocene climate transition (MMCT) was a phase of global cooling possibly linked to decreasing levels of atmospheric CO2. The MMCT coincided with the European Mammal Faunal Zone MN6. From this time, important biogeographic links between Anatolia and eastern Africa include the hominid Kenyapithecus. Vertebrate fossils suggested mixed open and forested landscapes under (sub)tropical seasonal climates for Anatolia. Here, we infer the palaeoclimate during the MMCT and the succeeding cooling phase for a middle Miocene (14.8–13.2 Ma) of an intramontane basin in southwestern Anatolia using three2palaeobotanical proxies: (i) Köppen signatures based on the nearest-living-relative principle. (ii) Leaf physiognomy analysed with the Climate Leaf Analysis Multivariate Program (CLAMP). (iii) Genus-level biogeographic affinities of fossil floras with modern regions. The three proxies reject tropical climates for the MMCT of southwestern Anatolia and instead infer warm temperate C climates. Köppen signatures reject summer-dry Cs climates but cannot discriminate between fully humid Cf and winter-dry Cw; CLAMP reconstructs Cf climate based on the low X3.wet/X3.dry ratio. Additionally, we assess whether the palaeobotanical record does resolve transitions from the warm Miocene Climatic Optimum (MCO, 16.8–14.7 Ma) into the MMCT (14.7–13.9 Ma), and a more pronounced cooling at 13.9–13.8 Ma, as reconstructed from benthic stable isotope data. For southwestern Anatolia, we find that arboreal taxa predominate in MCO floras (MN5), whereas in MMCT floras (MN6) abundances of arboreal and non-arboreal elements strongly fluctuate indicating higher structural complexity of the vegetation. Our data show a distinct pollen zone between MN6 and MN7+8 dominated by herbaceous taxa. The boundary MN6 and MN7+8, roughly corresponding to a first abrupt cooling at 13.9–13.8 Ma, possibly might be associated with this herb-rich pollen zone.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Klimatforskning hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Climate Research hsv//eng
NATURVETENSKAP Biologi Botanik hsv//swe
NATURAL SCIENCES Biological Sciences Botany hsv//eng
NATURVETENSKAP Geovetenskap och miljövetenskap Geologi hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Geology hsv//eng
NATURVETENSKAP Geovetenskap och miljövetenskap Naturgeografi hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Physical Geography hsv//eng
Miocene
Climate proxies
The changing Earth
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Added entries (persons, corporate bodies, meetings, titles ...)

Güner, Tuncay H.Naturhistoriska riksmuseet,Enheten för paleobiologi,Faculty of Forestry, Department of Forest Botany, Istanbul University Cerrahpa¸sa, 34473 Bahçeköy, Istanbul, Turkey(Swepub:nrm)TuncGune (author)
Denk, ThomasNaturhistoriska riksmuseet,Enheten för paleobiologi(Swepub:nrm)thomdenk (author)
Naturhistoriska riksmuseetEnheten för paleobiologi (creator_code:org_t)

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In:Climate of the Past DiscussionsVienna : European Geosciences Union (EGU)14, s. 1427-14401814-93401814-93591814-9332

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By the author/editor: Bouchal, Johanne ...; Güner, Tuncay H.; Denk, Thomas

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Climate Research

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Botany

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geology

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Physical Geograp ...

Articles in the publication: Climate of the P ...

By the university: Swedish Museum of Natural History

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