An authigenic calcite layer in the sediments of the Sea of Marmara—A geochemical marker horizon with paleoceanographic significance

Reichel, T.; Halbach, Peter

doi:10.1016/j.dsr2.2007.04.008

Cited by 20 publications

(19 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The highest values characterize the 1380-980 cm so-called "sapropelic" interval. This organic matter enrichment has been previously reported in the different basins of the Sea of Marmara, and in the shallower zone between the Tekirdag and Central basins (Çagatay et al, 2000;Reichel and Halbach, 2007;Vidal et al, 2010). The different ages proposed are in agreement and a 11-7.5 kyr BP period (cal 14 C without reservoir correction) has been attributed to this particular episode.…”

Section: Background Sedimentationsupporting

confidence: 72%

“…The end of significant Black Sea input at 11.5 cal kyr BP (Vidal et al, 2010) may correspond to the end of the calcite-rich episode. Differences may be due to data sets respectively coming from a deep basin floor (Vidal et al, 2010) and from a shallower setting between two basins (Reichel and Halbach, 2007).…”

Section: The Nonmarine To Marine Transition -Age and Implicationsmentioning

confidence: 99%

“…Due to its importance for the study of the last climatic cycle, the hydrologic evolution of the Sea of Marmara has been intensively surveyed by different authors through sedimentation. Biological, chemical, mineralogical, and isotopic proxies, have been analyzed to detect the respective influence of the Black Sea and the Aegean Sea since the Last Glacial Maximum (MIS 2) depending on their surface level (Çagatay et al, 2000;Major et al, 2006;Reichel and Halbach, 2007;Eriş et al, 2007;Vidal et al, 2010). The impact of these variations has also been investigated in shallow parts (Çagatay et al, 2003).…”

Section: The Nonmarine To Marine Transition -Age and Implicationsmentioning

confidence: 99%

“…The impact of these variations has also been investigated in shallow parts (Çagatay et al, 2003). Based on detailed data from cores taken in the Central Basin and between the Tekirdag and Central basins, Reichel and Halbach (2007) proposed a model of fresh water and marine water mixing. Their results fit with their detection of a calcite peak (30 %) related to authigenic precipitation and interpreted as the result of a first mixing of bottom anoxic fresh water with surface oxic marine water.…”

Section: The Nonmarine To Marine Transition -Age and Implicationsmentioning

confidence: 99%

See 3 more Smart Citations

Estimation of successive coseismic vertical offsets using coeval sedimentary events – application to the southwestern limit of the Sea of Marmara's Central Basin (North Anatolian Fault)

Beck

Campos

Eriş

et al. 2015

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. In the deep part of the Sea of Marmara (Turkey), the sedimentation developing upon the North Anatolian Fault is strongly influenced by the associated seismic activity, through gravity reworking (fluidized landslides) and tsunamis. Specific layers (homogenites + turbidites, HmTu), representing individual sedimentary events, have been characterized along three giant piston cores retrieved from the Çinarcik and Central (or Orta) basins. Pre-Holocene, nonmarine sediments, were analyzed, representing the last 12-17 kyr BP (before present). For a 2 kyr long interval, 11 events could be precisely correlated on both sides of the Central Basin's southwestern scarp. For each of them, based on the specific depositional process, the thickness difference between the two sites was considered as a direct estimation of the vertical component of a coeval coseismic offset. The homogenite (upper) component accounts for the major part of the thickness difference (ranging from 36 to 144 cm). These offsets were considered as likely representing dominantly vertical throws, along the transtensional southwestern boundary of the inner, pull-apart Central Basin. In terms of natural hazards, further investigations on this local behavior should rather be directed to tsunami genesis.

show abstract

Section: Background Sedimentationsupporting

confidence: 72%

Section: The Nonmarine To Marine Transition -Age and Implicationsmentioning

confidence: 99%

Section: The Nonmarine To Marine Transition -Age and Implicationsmentioning

confidence: 99%

Section: The Nonmarine To Marine Transition -Age and Implicationsmentioning

confidence: 99%

See 2 more Smart Citations

Estimation of successive coseismic vertical offsets using coeval sedimentary events – application to the southwestern limit of the Sea of Marmara's Central Basin (North Anatolian Fault)

Beck

Campos

Eriş

et al. 2015

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…After its reconnection with the Mediterranean about 12 kyr 14C BP the sea level in the Sea of Marmara rose in tandem with the global ocean. The mixing of the anoxic lake deep water and oxygenated marine surface water caused the precipitation of authigenic carbonates (Reichel and Halbach, 2007). A sapropelic sediment layer was deposited between 11,500 and 7,000 yr BP under suboxic bottom water conditions.…”

Section: Geological Settingmentioning

confidence: 99%

Geochemical Dynamics of the Natural-Gas Hydrate System in the Sea of Marmara, Offshore Turkey

Ruffine¹,

Fandiño²,

Étoubleau³

et al. 2012

Advances in Natural Gas Technology

View full text Add to dashboard Cite

Pore water geochemistry at two seismogenic areas in the Sea of Marmara

Ruffine

Germain

Polonia

et al. 2015

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Within the Sea of Marmara, the highly active North Anatolian Fault (NAF) is responsible for major earthquakes (Mw 7), and acts as a pathway for fluid migration from deep sources to the seafloor. This work reports on pore water geochemistry from three sediment cores collected in the Gulfs of Izmit and Gemlik, along the Northern and the Middle strands of the NAF, respectively. The resulting data set shows that anaerobic oxidation of methane (AOM) is the major process responsible for sulfate depletion in the shallow sediment. In the Gulf of Gemlik, depth concentration profiles of both sulfate and alkalinity exhibit a kink-type profile. The Sulfate Methane Transition Zone (SMTZ) is located at moderate depth in the area. In the Gulf of Izmit, the low concentrations observed near the seawater-sediment interface for sulfate, calcium, strontium, and magnesium result from rapid geochemical processes, AOM, and carbonate precipitation, occurring in the uppermost part of the sedimentary column and sustained by free methane accumulation. Barite dissolution and carbonate recrystallization have also been identified at deeper depth at the easternmost basin of the Gulf of Izmit. This is supported by the profile of the strontium isotope ratios ( 87 Sr/ 86 Sr) as a function of depth which exhibits negative anomalies compared to the modern seawater value. The strontium isotopic signature also shows that these carbonates had precipitated during the reconnection of the Sea of Marmara with the Mediterranean Sea. Finally, a first attempt to interpret the sulfate profiles observed in the light of the seismic activity at both sites is presented. We propose the hypothesis that seismic activity in the areas is responsible for the transient sulfate profile, and that the very shallow SMTZ depths observed in the Gulf of Izmit is likely due to episodic release of significant amount of methane.

show abstract

An authigenic calcite layer in the sediments of the Sea of Marmara—A geochemical marker horizon with paleoceanographic significance

Cited by 20 publications

References 36 publications

Estimation of successive coseismic vertical offsets using coeval sedimentary events – application to the southwestern limit of the Sea of Marmara's Central Basin (North Anatolian Fault)

Estimation of successive coseismic vertical offsets using coeval sedimentary events – application to the southwestern limit of the Sea of Marmara's Central Basin (North Anatolian Fault)

Geochemical Dynamics of the Natural-Gas Hydrate System in the Sea of Marmara, Offshore Turkey

Pore water geochemistry at two seismogenic areas in the Sea of Marmara

Contact Info

Product

Resources

About