scholarly journals Stable Carbon and Oxygen Isotopic Composition of Mio-Pliocene Bivalve Shells and Calcareous Sediments in Nhila Anticline, Southeast Bengal Basin, Bangladesh

2014 ◽  
Vol 8 ◽  
pp. 113-117
Author(s):  
HM Zakir Hossain ◽  
Md Sultan-Ul-Islam ◽  
John S Armstrong-Altrin ◽  
Alcides N Sial ◽  
Sabbir Ahamed ◽  
...  
Keyword(s):  
Oxygen Isotopic Composition ◽  
Bengal Basin ◽  
Stable Carbon ◽  
Lower Section ◽  
Diagenetic Alteration ◽  
Salinity Gradients ◽  
Oxygen Isotopic ◽  
Bivalve Shell ◽  
Calcareous Sediment ◽  
Bivalve Shells

Stable carbon (?13C) and oxygen (?18O) isotopes of bivalve shells and calcareous sediments of the Mio-Pliocene Nhila Anticline, southeast Bengal Basin, Bangladesh have been investigated to obtain information on paleoclimate and paleoenvironment conditions during deposition. The ?13CPDB, ?18OPDB and ?18OSMOW values in bivalve shell range from -2.81‰ to -1.56‰, -3.57‰ to -2.39‰ and 27.18‰ to 28.40‰ in bivalve shells and -13.90‰ to -1.75‰, -4.71‰ to -2.13‰ and 26.01‰ to 28.66‰ in calcareous sediments, respectively. The ?13CPDB values in bivalve shells are comparable to that of calcareous sediments (~ -1.75‰) in the upper section, but ?13CPDB values in calcareous sediments are more negative excursion towards lower section (up to -13.90‰). These results signify that salinity gradients could modified the isotope values and/or strong influence of freshwater conditions. The variable ?18OPDB values in both bivalve shell and calcareous sediment suggesting diagenetic alteration of carbonates and water temperature effects. The more negative ?18OPDB values imply humid paleoclimatic conditions during the Mio-Pliocene sedimentation. Therefore, the ?18OPDB values of the Mio-Pliocene sediments of Nhila Anticline are probably controlled by paleotemperature leading to intensification of high rainfall. DOI: http://dx.doi.org/10.3329/jles.v8i0.20155 J. Life Earth Sci., Vol. 8: 113-117, 2013

The utility of stable isotopic signatures in coral skeletons

1996 ◽  
Vol 1 ◽  
pp. 249-291 ◽  
Author(s):  
Peter K. Swart ◽  
Jim J. Leder
Keyword(s):  
Isotopic Composition ◽  
Dissolved Inorganic Carbon ◽  
Carbon Isotopic Composition ◽  
Oxygen Isotopic Composition ◽  
Stable Carbon ◽  
Carbon And Oxygen Isotopes ◽  
Coral Skeletons ◽  
Carbon And Oxygen Isotope ◽  
Oxygen Isotopic ◽  
Zooxanthellate Corals

There is a fundamental ecologic differentiation between zooxanthellate and non-zooxanthellate corals. This paper reviews factors which govern the stable carbon and oxygen isotopic composition of these groups of corals. Although the stable carbon and oxygen isotope compositions of coral skeletons are strongly influenced by environmental and physiological factors, the precise mechanisms remain a matter of debate. In particular the oxygen isotopic composition is known to be governed by the temperature and the oxygen isotopic composition of the water and perhaps also by kinetic factors. In contrast the carbon isotopic composition is controlled by a combination of photosynthesis, respiration, autotrophy, heterotrophy, and the isotopic composition of dissolved inorganic carbon. Using a combination of carbon and oxygen isotopes it is possible to distinguish zooxanthellate from non-zooxanthellate corals.

Postimpact earliest Paleogene warming shown by fish debris oxygen isotopes (El Kef, Tunisia)

Science ◽  
2018 ◽  
Vol 360 (6396) ◽  
pp. 1467-1469 ◽  
Author(s):  
K. G. MacLeod ◽  
P. C. Quinton ◽  
J. Sepúlveda ◽  
M. H. Negra
Keyword(s):  
Isotopic Composition ◽  
Oxygen Isotopic Composition ◽  
Greenhouse Warming ◽  
Suitable Material ◽  
Diagenetic Alteration ◽  
El Kef ◽  
Oxygen Isotopic ◽  
Stratotype Section ◽  
Short Time ◽  
Chicxulub Impact

Greenhouse warming is a predicted consequence of the Chicxulub impact, but supporting data are sparse. This shortcoming compromises understanding of the impact’s effects, and it has persisted due to an absence of sections that both contain suitable material for traditional carbonate- or organic-based paleothermometry and are complete and expanded enough to resolve changes on short time scales. We address the problem by analyzing the oxygen isotopic composition of fish debris, phosphatic microfossils that are relatively resistant to diagenetic alteration, from the Global Stratotype Section and Point for the Cretaceous/Paleogene boundary at El Kef, Tunisia. We report an ~1 per mil decrease in oxygen isotopic values (~5°C warming) beginning at the boundary and spanning ~300 centimeters of section (~100,000 years). The pattern found matches expectations for impact-initiated greenhouse warming.

Climate signals in the ring widths and stable carbon, hydrogen and oxygen isotopic composition of Larix decidua growing at the forest limit in the southeastern European Alps

Trees ◽  
2011 ◽  
Vol 25 (6) ◽  
pp. 1141-1154 ◽  
Author(s):  
Polona Hafner ◽  
Iain Robertson ◽  
Danny McCarroll ◽  
Neil J. Loader ◽  
Mary Gagen ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Oxygen Isotopic Composition ◽  
Larix Decidua ◽  
European Alps ◽  
Stable Carbon ◽  
Oxygen Isotopic ◽  
Climate Signals ◽  
Forest Limit
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