Source characterization using molecular distribution and stable carbon isotopic composition of n-alkanes in sediment cores from the tropical Mundaú–Manguaba estuarine–lagoon system, Brazil

2012 ◽  
Vol 53 ◽  
pp. 25-33 ◽  
Author(s):  
Thais R. Silva ◽  
Silvia R.P. Lopes ◽  
Gertrud Spörl ◽  
Bastiaan A. Knoppers ◽  
Débora A. Azevedo
Keyword(s):  
Isotopic Composition ◽  
Sediment Cores ◽  
Carbon Isotopic Composition ◽  
Stable Carbon ◽  
Source Characterization ◽  
Lagoon System ◽  
Molecular Distribution ◽  
Carbon Isotopic ◽  
Estuarine Lagoon

scholarly journals Environmental influences on the stable carbon isotopic composition of Devonian and Early Carboniferous land plants

2019 ◽  
Vol 531 ◽  
pp. 109100 ◽  
Author(s):  
Zhenzhu Wan ◽  
Thomas J. Algeo ◽  
Patricia G. Gensel ◽  
Stephen E. Scheckler ◽  
William E. Stein ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Environmental Influences ◽  
Carbon Isotopic Composition ◽  
Early Carboniferous ◽  
Land Plants ◽  
Stable Carbon ◽  
Carbon Isotopic

scholarly journals Radiocarbon in Porewater of Continental Shelf Sediments (Southeast Mediterranean)

Radiocarbon ◽  
2004 ◽  
Vol 46 (2) ◽  
pp. 633-642 ◽  
Author(s):  
O Sivan ◽  
B Lazar ◽  
E Boaretto ◽  
Y Yechieli ◽  
B Herut
Keyword(s):  
Sediment Cores ◽  
Carbon Isotopic Composition ◽  
Mediterranean Coast ◽  
Shelf Water ◽  
Stable Carbon ◽  
Last Glacial Period ◽  
Carbon Isotopic ◽  
Shelf Sediments ◽  
Water Depths ◽  
The Last Glacial

In this study, we aim to characterize the main processes controlling 14CDIC concentrations in porewater at the shallow shelf (water depth less than 120 m) off the Mediterranean coast of Israel. At these water depths, we expected to find evidence for seawater penetration toward the coast, since this area was flooded by seawater only some 18,000 yr ago (the end of the Last Glacial period).Measurements of the chemical composition (14CDIC) and stable carbon isotopic composition (δ13CDIC) were performed in several sediment cores (40–250 cm long) at water depths between 6 and 115 m. At water depths of 60 m, represented by a 2.5-m-long sediment core, the porewater 14CDIC levels (85–87 pMC) were lower than the corresponding sediment values in each layer (92–95 pMC), mainly due to the oxidation of relatively old organic matter (about 70 pMC) with no evidence to advection. In contrast, sediment cores from water depths shallower than 50 m showed only slight anaerobic oxidation and high 14CDIC values of approximately 100 pMC, indicating possible downward advection. These geochemical observations support the perception that the penetration of seawater into the coastal aquifer occurs at the shallow water zone (<50 m), while further verification by deeper cores is required.

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