Stable isotope-based reconstruction of Oligo-Miocene paleoenvironment and paleohydrology of Central Anatolian lake basins (Turkey)

Tina LÜDECKE; Tamás MIKES; F. Bora ROJAY; Michael A. COSCA; Andreas MULCH

Makale detayları

Stable isotope-based reconstruction of Oligo-Miocene paleoenvironment and paleohydrology of Central Anatolian lake basins (Turkey)

Yazarlar:

Tina LÜDECKE | Tamás MIKES | F. Bora ROJAY | Michael A. COSCA | Andreas MULCH

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2013 Vol.22 Issue 5, pp.793-819

Belge Tipi:

Makale

Yayın Tarihi:

4/2013

Belge Dili:

Türkçe

Document ID (Org No.):

2000731722

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985

Özet:

 

Isotope geochemistry of lacustrine carbonate represents a powerful tool to reconstruct paleoclimatic and paleoenvironmental conditions. Here, we present a comprehensive set of long-term oxygen (delta18O) and carbon (delta13C) stable isotope records from 5 Chattian to Burdigalian lacustrine sequences distributed over the Central Anatolian Plateau. Field relationships combined with stable isotope geochemistry indicate a relatively humid subtropic Late Oligocene climate with an environment characterized by large, temporally open freshwater lakes. Approximately during the middle Aquitanian, a 4%o-5%o increase in lake delta18O values indicates changes in regional climate including more arid conditions and an increasing dominance of closed saline lake conditions in the central plateau region. This time period was also characterized by frequent climatic fluctuations such as short-lived humid periods, possibly recording the influence of seasonality, topography, and the waxing and waning of aridity. In general, relatively high Oligo-Miocene delta18O lake water values within the modern plateau interior, even for the least evaporative sequences, suggest the absence of significant orographic barriers at both the northern and southern plateau margins prior to 20-16 Ma.

 

Isotope geochemistry of lacustrine carbonate represents a powerful tool to reconstruct paleoclimatic and paleoenvironmental conditions. Here, we present a comprehensive set of long-term oxygen (delta18O) and carbon (delta13C) stable isotope records from 5 Chattian to Burdigalian lacustrine sequences distributed over the Central Anatolian Plateau. Field relationships combined with stable isotope geochemistry indicate a relatively humid subtropic Late Oligocene climate with an environment characterized by large, temporally open freshwater lakes. Approximately during the middle Aquitanian, a 4%o-5%o increase in lake delta18O values indicates changes in regional climate including more arid conditions and an increasing dominance of closed saline lake conditions in the central plateau region. This time period was also characterized by frequent climatic fluctuations such as short-lived humid periods, possibly recording the influence of seasonality, topography, and the waxing and waning of aridity. In general, relatively high Oligo-Miocene delta18O lake water values within the modern plateau interior, even for the least evaporative sequences, suggest the absence of significant orographic barriers at both the northern and southern plateau margins prior to 20-16 Ma.

Makale detayları

Stable isotope-based reconstruction of Oligo-Miocene paleoenvironment and paleohydrology of Central Anatolian lake basins (Turkey)

Yazarlar: Tina LÜDECKE | Tamás MIKES | F. Bora ROJAY | Michael A. COSCA | Andreas MULCH

Yayıncı: TUBITAK

Dergi: Turkish Journal of Earth Sciences 2013 Vol.22 Issue 5, pp.793-819

Belge Tipi: Makale

Yayın Tarihi: 4/2013

Belge Dili: Türkçe

Document ID (Org No.): 2000731722

Sıklık: İki Aylık

eISSN: 1303-619X

pISSN: 1300-0985

Sayı

Yazarlar:

Tina LÜDECKE | Tamás MIKES | F. Bora ROJAY | Michael A. COSCA | Andreas MULCH

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Earth Sciences 2013 Vol.22 Issue 5, pp.793-819

Belge Tipi:

Makale

Yayın Tarihi:

4/2013

Belge Dili:

Türkçe

Document ID (Org No.):

2000731722

Sıklık:

İki Aylık

eISSN:

1303-619X

pISSN:

1300-0985