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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Mineralogical evidence for warm and dry climatic conditions in the Neo-Tethys (eastern Turkey) during the middle Eocene

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Rego, E. S. [1] ; Jovane, L. [1] ; Hein, J. R. [2] ; Sant'Anna, L. G. [3, 4] ; Giorgioni, M. [1, 5] ; Rodelli, D. [1] ; Ozcan, E. [6]
Total Authors: 7
[1] Univ Sao Paulo, Inst Oceanog, BR-05508120 Sao Paulo - Brazil
[2] US Geol Survey, Santa Cruz, CA 95060 - USA
[3] Univ Sao Paulo, Escola Artes Ciencias & Humanidades, BR-03828000 Sao Paulo - Brazil
[4] Univ Sao Paulo, Inst Energia & Ambiente, BR-03828000 Sao Paulo - Brazil
[5] Univ Brasilia, Inst Geociencias, BR-70910900 Brasilia, DF - Brazil
[6] Istanbul Tech Univ, Dept Geol Engn, Fac Mines, TR-34469 Istanbul - Turkey
Total Affiliations: 6
Document type: Journal article
Web of Science Citations: 1

Minerals in stratigraphic sections are valuable tools for reconstructing past environmental conditions. Given the state of preservation of clay minerals, it is possible to determine under what conditions they formed, which provides clues about continental weathering (inherited minerals) and geochemical conditions in the water column or pore waters (neoformed or transformed) of the sedimentary environment. This study presents new mineralogical and chemical data from the Baskil section, a well-preserved middle Eocene Neo-Tethys sequence from eastern Turkey. Greater terrigenous input is marked by the increase of silicate minerals (e.g. phyllosilicates, quartz, and albite) in the section from 40.5 to 40 Ma, which diluted the marine carbonate content. This period is correlative with the global Middle Eocene Climatic Optimum (MECO) event. Authigenic palygorskite increased from the middle to the uppermost portion (similar to 40 to 37.3 Ma) of the section, indicating dryer conditions in the continent and availability of Si and Mg in the water column and pore waters favorable for its formation. Additionally, we suggest a stratified water column with warmer and more saline conditions at greater depths (e.g. > 200 m) after similar to 40 Ma favoring palygorskite and possibly authigenic dolomite precipitation. The mineralogical variations and element chemistry of rocks in the Baskil section reflect how detrital sources and weathering regimes changed in this area during the middle Eocene, and how these changes can be related to global, regional, and local processes. (AU)

FAPESP's process: 15/16501-4 - Variation of minerals and clay minerals recorded in the Atlantic and Neo-Tethys ocean: new evidence of a global warming event in the middle Eocene
Grantee:Eric Siciliano Rego
Support type: Scholarships in Brazil - Master
FAPESP's process: 12/15995-5 - Stable isotope geochemistry as main tool to unravel Eocene-Oligocene paleoclimate and paleoceanography
Grantee:Martino Giorgioni
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 11/22018-3 - Primary productivity in oceans studying magnetotactic bacteria in sediments
Grantee:Luigi Jovane
Support type: Research Program on Global Climate Change - Young Investigators
FAPESP's process: 16/02288-0 - Variation of minerals and clay minerals recorded in the Neo-Tethys and Southern Ocean: new evidence of a global warming event in the middle Eocene
Grantee:Eric Siciliano Rego
Support type: Scholarships abroad - Research Internship - Master's degree