Sedimentary carbon-isotope systematics on the Amazon shelf

1996 ◽  
Vol 16 (1) ◽  
pp. 17-23 ◽  
Author(s):  
Christopher K. Sommerfield ◽  
Charles A. Nittrouer ◽  
David J. DeMaster
Keyword(s):  
Carbon Isotope ◽  
Amazon Shelf ◽  
Isotope Systematics ◽  
Sedimentary Carbon

scholarly journals Modeling the consequences on late Triassic environment of intense pulse-like degassing during the Central Atlantic Magmatic Province using the GEOCLIM model

2012 ◽  
Vol 8 (3) ◽  
pp. 2075-2110 ◽  
Author(s):  
G. Paris ◽  
Y. Donnadieu ◽  
V. Beaumont ◽  
F. Fluteau ◽  
Y. Goddéris
Keyword(s):  
Carbon Cycle ◽  
Carbon Isotope ◽  
Carbon Isotopic Composition ◽  
Late Triassic ◽  
Carbonate Production ◽  
Carbon Isotopic ◽  
Central Atlantic Magmatic Province ◽  
Igneous Provinces ◽  
Central Atlantic ◽  
Sedimentary Carbon

Abstract. The Triassic-Jurassic boundary (TJB) is associated with one of the five largest mass extinctions of the Phanerozoic. A deep carbon cycle perturbation and a carbonate production crisis are observed during the late Triassic. The Central Atlantic Magmatic Province (CAMP), one of the most important large igneous provinces of the Phanerozoic, emplaced at the TJB. To understand the carbon cycle perturbations observed at the TJB, we investigate the consequences of CO2 degassing associated to the CAMP emplacement on atmospheric and oceanic carbon cycle. The CO2 input within the atmosphere due to volcanism has been modeled using a global biogeochemical cycle box model (COMBINE) coupled with a climate model (FOAM). Weathering fluxes and CO2 equilibrium are constrained by the Rhaetian paleogeography and different scenarios of the CAMP emplacement are modeled. The study focuses (1) on the geological record and the carbonate productions crisis and (2) on the sedimentary carbon isotope record. For point (1), comparison of different modeling scenarios shows that a Gaussian CO2 emission distribution over the duration of the main activity phase of the CAMP fails in reproducing any of the geological observations, mainly the carbonate production crisis observed in the late Rhaetian sediments. Contrastingly, intense degassing peaks lead to successive decrease in carbonate production as observed in the geological record. For point (2), the perturbations of carbon cycle due to the degassing of CO2 with a mantellic carbon isotopic composition of −5‰ do not reproduce the intensity of the observed carbon isotope excursions. This was achieved in our model by assuming a mantellic carbon isotopic composition of −20‰. Even if this hypothesis requires further investigations, such low values may be associated to degassing of carbon from pools of light isotopic carbon located at the transition zone (Cartigny, 2010), possibly linked to setting of large igneous provinces (LIP's). Breakdown of biological primary productivity can also partially account for the sedimentary carbon isotope excursions and for the observed increase of atmospheric pCO2.

Helium and carbon isotope systematics of natural gases from Taranaki Basin, New Zealand

2001 ◽  
Vol 16 (4) ◽  
pp. 419-436 ◽  
Author(s):  
John R. Hulston ◽  
D.R. Hilton ◽  
I.R. Kaplan
Keyword(s):  
New Zealand ◽  
Carbon Isotope ◽  
Natural Gases ◽  
Isotope Systematics

scholarly journals Carbon isotope systematics of Turrialba volcano, Costa Rica, using a portable cavity ring-down spectrometer

2017 ◽  
Vol 18 (7) ◽  
pp. 2769-2784 ◽  
Author(s):  
K. S. Malowany ◽  
J. Stix ◽  
J. M. de Moor ◽  
K. Chu ◽  
G. Lacrampe-Couloume ◽  
...  
Keyword(s):  
Costa Rica ◽  
Carbon Isotope ◽  
Turrialba Volcano ◽  
Isotope Systematics ◽  
Cavity Ring Down

Carbon isotope systematics of a mantle “hotspot”: a comparison of Loihi Seamount and MORB glasses

1986 ◽  
Vol 78 (2-3) ◽  
pp. 189-199 ◽  
Author(s):  
R.A. Exley ◽  
D.P. Mattey ◽  
D.A. Clague ◽  
C.T. Pillinger
Keyword(s):  
Carbon Isotope ◽  
Isotope Systematics

scholarly journals Helium and carbon isotope systematics at Ontake volcano, Japan

1998 ◽  
Vol 103 (B10) ◽  
pp. 23863-23873 ◽  
Author(s):  
Yuji Sano ◽  
Yoshiro Nishio ◽  
Sho Sasaki ◽  
Toshitaka Gamo ◽  
Keisuke Nagao
Keyword(s):  
Carbon Isotope ◽  
Ontake Volcano ◽  
Isotope Systematics

Helium and carbon isotope systematics in crustal fluids from the Eifel, Oberpfalz and Schwarzwald

1988 ◽  
Vol 70 (1-2) ◽  
pp. 37
Author(s):  
E. Griesshaber ◽  
R.K. O'Nions ◽  
E.R. Oxburgh
Keyword(s):  
Carbon Isotope ◽  
Crustal Fluids ◽  
Isotope Systematics
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