scholarly journals Latest Danian carbon isotope anomaly and associated environmental change in the southern Tethys (Nile Basin, Egypt)

2009 ◽  
Vol 166 (6) ◽  
pp. 1135-1142 ◽  
Author(s):  
André Bornemann ◽  
Peter Schulte ◽  
Jorinde Sprong ◽  
Etienne Steurbaut ◽  
Mohamed Youssef ◽  
...  
Keyword(s):  
Environmental Change ◽  
Carbon Isotope ◽  
Nile Basin ◽  
Southern Tethys

scholarly journals Stable isotopes, ecological integration and environmental change: wolves record atmospheric carbon isotope trend better than tree rings

2007 ◽  
Vol 274 (1624) ◽  
pp. 2471-2480 ◽  
Author(s):  
Joseph K Bump ◽  
Kena Fox-Dobbs ◽  
Jeffrey L Bada ◽  
Paul L Koch ◽  
Rolf O Peterson ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Environmental Change ◽  
Carbon Isotope ◽  
Tree Rings ◽  
Atmospheric Carbon ◽  
Better Than

Dynamics of a stepped carbon-isotope excursion: Ultra high-resolution study of Early Toarcian environmental change

2012 ◽  
Vol 319-320 ◽  
pp. 45-54 ◽  
Author(s):  
Michaël Hermoso ◽  
Fabrice Minoletti ◽  
Rosalind E.M. Rickaby ◽  
Stephen P. Hesselbo ◽  
François Baudin ◽  
...  
Keyword(s):  
High Resolution ◽  
Environmental Change ◽  
Carbon Isotope ◽  
Carbon Isotope Excursion ◽  
Resolution Study

scholarly journals Carbon isotopes, stratigraphy, and environmental change: the Middle–Upper Cambrian Positive Excursion (SPICE) in Port au Port Group, western Newfoundland, Canada

2018 ◽  
Vol 55 (11) ◽  
pp. 1209-1222 ◽  
Author(s):  
Rosalia Barili ◽  
Joyce Elaine Neilson ◽  
Alexander Thomas Brasier ◽  
Karin Goldberg ◽  
Tatiana Pastro Bardola ◽  
...  
Keyword(s):  
North America ◽  
Environmental Change ◽  
Carbon Isotope ◽  
Carbon Isotopes ◽  
Carbonate Rocks ◽  
Isotopic Signature ◽  
Upper Cambrian ◽  
Carbon Isotopic ◽  
Carbon Isotope Excursion ◽  
Diagenetic Environment

In many basins, Upper Cambrian carbonate successions display intervals with a positive carbon isotope excursion (CIE) of up to +5‰. In North America, this marks the boundary between the Sauk II–III super-sequences. A Steptoean positive carbon isotope excursion (SPICE) locality previously identified in the Port au Port peninsula, western Newfoundland, has been revisited and an additional potential SPICE locality found. In both locations, a CIE is found to be associated with a prominent bioherm and sandstone layer within a sequence of carbonate rocks. At March Point columnar stromatolites occur, whereas at Felix Cove thrombolites can be seen. In the latter, the sandstone immediately overlies the thrombolites coincident with the CIE, whereas at March Point a dolomitized grainstone occurs above the stromatolites. The sandstone at this locality post-dates the CIE. Although lower than the SPICE in some localities, a positive CIE is present in both sections: March Point (+1.1‰) and Felix Cove (+1.8‰). Additionally, δ13Corg rises from −30.0‰ to −22.0‰ at March Point and from −27‰ to −24.0‰ at Felix Cove and, in accordance with previously published work, we suggest that this could be the SPICE. Comparison of the stratigraphy and petrography between the two localities suggest that both depositional and diagenetic factors could have influenced the nature of the interpreted SPICE in Newfoundland. It is also possible that the local carbon isotopic signature may have been influenced by a semi-restricted depositional and early diagenetic environment related to the paleogeographic configuration rather than the global marine excursion.

A long record of environmental change from bat guano deposits in Makangit Cave, Palawan, Philippines

2007 ◽  
Vol 98 (1) ◽  
pp. 59-69 ◽  
Author(s):  
Michael I. Bird ◽  
Ella M. Boobyer ◽  
Charlotte Bryant ◽  
Helen A. Lewis ◽  
Victor Paz ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Environmental Change ◽  
Tropical Forest ◽  
Carbon Isotope ◽  
Isotope Composition ◽  
First Record ◽  
Stable Isotope Composition ◽  
Lower Section ◽  
The Last Glacial Maximum ◽  
The Last Glacial

ABSTRACTWe present the first record of Holocene and Pleistocene environmental change derived from the chemical and stable-isotope composition of a tropical cave guano sequence from Makangit Cave in northern Palawan (Philippines). The 180 cm sequence of guano, derived predominantly from insectivorous bats and birds, consists of two distinct units. An upper section of reddish-brown oxidised guano to 110 cm was deposited since the mid-Holocene while a lower section of black, reduced guano was deposited through the Last Glacial Maximum (LGM) to >30 000 BP. Carbon-isotope (δ13C) values in guano deposited during the LGM are as high as −13·5‰ indicating that a C4-dominated grassland existed in the area around the cave at this time. Guano δ13C values of − 25‰ to − 28‰ suggest that this open vegetation was replaced by C3-dominated closed tropical forest, similar to that of the present, by the mid-Holocene. The results suggest that the climate of northern Palawan was substantially drier at the LGM than is currently the case.

DECIPHERING THE RECORD OF BIOLOGIC AND ENVIRONMENTAL CHANGE DURING THE LATER CAMBRIAN STEPTOEAN POSITIVE CARBON ISOTOPE EXCURSION

2017 ◽  
Author(s):  
Benjamin C. Gill ◽  
◽  
Matthew A. LeRoy ◽  
Angela Gerhardt ◽  
Theodore R. Them ◽  
...  
Keyword(s):  
Environmental Change ◽  
Carbon Isotope ◽  
Carbon Isotope Excursion

Carbon isotope evidence for environmental change in Nihewan Basin, China

1998 ◽  
Vol 43 (S1) ◽  
pp. 138-138
Author(s):  
Yang Wang ◽  
Junshe Dong ◽  
Ronald Amundson
Keyword(s):  
Environmental Change ◽  
Carbon Isotope ◽  
Nihewan Basin ◽  
Isotope Evidence
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