The Permian-Triassic boundary sections in northern Vietnam (Nhi Tao and Lung Cam sections): Carbon-isotope excursion and elemental variations indicate major anoxic event

Palaeoworld ◽  
2007 ◽  
Vol 16 (1-3) ◽  
pp. 51-66 ◽  
Author(s):  
Trinh Hai Son ◽  
Christian Koeberl ◽  
Nguyen Linh Ngoc ◽  
Dang Tran Huyen
Keyword(s):  
Carbon Isotope ◽  
Triassic Boundary ◽  
Northern Vietnam ◽  
Carbon Isotope Excursion ◽  
Anoxic Event ◽  
Permian Triassic Boundary

scholarly journals Simulation of Carbon Isotope Excursion Events at the Permian-Triassic Boundary Based on GEOCARB

2018 ◽  
Vol 10 (1) ◽  
pp. 441-451 ◽  
Author(s):  
Y. J. Zhong ◽  
K. K. Huang ◽  
Y. F. Lan ◽  
A. Q. Chen
Keyword(s):  
Carbon Isotope ◽  
Inorganic Carbon ◽  
Dynamic Equilibrium ◽  
Terrestrial Ecosystem ◽  
Marine Species ◽  
Balance Model ◽  
Triassic Boundary ◽  
Carbon Isotope Excursion ◽  
Environmental Events ◽  
Permian Triassic Boundary

Abstract The biggest Phanerozoic mass extinctionoccurred at the Permian-Triassic boundary and resulted in the loss of about 95% or more of all marine species. For quite some time, many kinds of abnormal environmental events were adopted to explain the abnormal reduction of carbon isotope at the Permian-Triassic boundary, however there still has not been a unified opinion. In this paper, based on the carbon cycle balance model of the earth under a long-period scale, the contributions of possible cataclysm events at the Permian-Triassic boundary to the carbon isotope records in carbonates were quantitatively simulated. The results proved that a single event, such as volcanism, terrestrial ecosystem collapse or another factor, was not strong enough to lead to the negative bias of carbon isotope at the Permian-Triassic boundary. Even though the release of methane hydrate can result in a comparably large negative excursion of inorganic carbon, this explanation becomes unsuitable when both the shifting Permian-Triassic boundary and the fluctuation record of other inorganic carbon isotopes in the early Triassic as a whole are considered. Therefore, it is suggested that the dynamic equilibrium between inorganic carbon reserves and organic carbon reserves was possibly disturbed by a superimposed effect of multiple events.

Are Late Permian carbon isotope excursions of local or of global significance?

2019 ◽  
Vol 132 (3-4) ◽  
pp. 521-544 ◽  
Author(s):  
Borhan Bagherpour ◽  
Hugo Bucher ◽  
Torsten Vennemann ◽  
Elke Schneebeli-Hermann ◽  
Dong-xun Yuan ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
South China ◽  
Sea Water ◽  
Equatorial Position ◽  
Late Permian ◽  
Terrestrial Organic Matter ◽  
Triassic Boundary ◽  
Atmospheric Propagation ◽  
Isotope Record ◽  
Permian Triassic Boundary

Abstract We present a new, biostratigraphically calibrated organic and inorganic C-isotope record spanning the basal Late Permian to earliest Triassic from southern Guizhou (Nanpanjiang basin, South China). After fluctuations of a likely diagenetic overprint are removed, three negative carbon isotope excursions (CIEs) persist. These include a short-lived CIE during the early Wuchiapingian, a protracted CIE ending shortly after the Wuchiapingian–Changhsingian Boundary, and a third CIE straddling the Permian–Triassic boundary. Comparison of our new C-isotope record with others from the same basin suggests that influences of local bathymetry and of the amount of buried terrestrial organic matter are of importance. Comparison with other coeval time series outside of South China also highlights that only the negative CIE at the Permian–Triassic boundary is a global signal. These differences can be explained by the different volumes of erupted basalts between the Late Permian Emeishan and the younger Siberian large igneous provinces and their distinct eruptive modalities. Emeishan volcanism was largely submarine, implying that sea water was an efficient buffer against atmospheric propagation of volatiles. The equatorial position of Emeishan was also an additional obstacle for volatiles to reach the stratosphere and benefit from an efficient global distribution. Consequently, the local significance of these CIEs calls into question global correlations based on C-isotope chemostratigraphy during the Late Permian. The timing of the Late Permian Chinese CIEs is also not reflected in changes in species diversity or ecology, unlike the sudden and global Permian–Triassic boundary crisis and subsequent Early Triassic upheavals.

A close-up view of the Permian–Triassic boundary based on expanded organic carbon isotope records from Norway (Trøndelag and Finnmark Platform)

2010 ◽  
Vol 74 (3-4) ◽  
pp. 156-167 ◽  
Author(s):  
Elke Hermann ◽  
Peter A. Hochuli ◽  
Hugo Bucher ◽  
Jorunn O. Vigran ◽  
Helmut Weissert ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Isotope ◽  
Triassic Boundary ◽  
Organic Carbon Isotope ◽  
Permian Triassic Boundary

scholarly journals A global event with a regional character: the Early Toarcian Oceanic Anoxic Event in the Pindos Ocean (northern Peloponnese, Greece)

2011 ◽  
Vol 148 (4) ◽  
pp. 619-631 ◽  
Author(s):  
N. KAFOUSIA ◽  
V. KARAKITSIOS ◽  
H. C. JENKYNS ◽  
E. MATTIOLI
Keyword(s):  
Carbon Isotope ◽  
Passive Margin ◽  
Oceanic Anoxic Event ◽  
Northern European ◽  
Carbon Isotope Excursion ◽  
Anoxic Event ◽  
Considerable Controversy ◽  
Regional Character ◽  
Globally Distributed ◽  
Ammonite Zones

AbstractThe Early Toarcian (Early Jurassic, c. 183 Ma) was characterized by an Oceanic Anoxic Event (T-OAE), primarily identified by the presence of globally distributed approximately coeval black organic-rich shales. This event corresponded with relatively high marine temperatures, mass extinction, and both positive and negative carbon-isotope excursions. Because most studies of the T-OAE have taken place in northern European and Tethyan palaeogeographic domains, there is considerable controversy as to the regional or global character of this event. Here, we present the first high-resolution integrated chemostratigraphic (carbonate, organic carbon, δ13Ccarb, δ13Corg) and biostratigraphic (calcareous nannofossil) records from the Kastelli Pelites cropping out in the Pindos Zone, western Greece. During the Mesozoic, the Pindos Zone was a deep-sea ocean-margin basin, which formed in mid-Triassic times along the northeast passive margin of Apulia. In two sections through the Kastelli Pelites, the chemostratigraphic and biostratigraphic (nannofossil) signatures of the most organic-rich facies are identified as correlative with the Lower Toarcian, tenuicostatum/polymorphum–falciferum/serpentinum/levisoni ammonite zones, indicating that these sediments record the T-OAE. Both sections also display the characteristic negative carbon-isotope excursion in organic matter and carbonate. This occurrence reinforces the global significance of the Early Toarcian Oceanic Anoxic Event.

scholarly journals Stratigraphic significance of carbon isotope variations in the shallow-marine Seis/Siusi Permian–Triassic boundary section (Southern Alps, Italy)

Fossil Record ◽  
2009 ◽  
Vol 12 (2) ◽  
pp. 197-205 ◽  
Author(s):  
S. H. Kraus ◽  
S. Siegert ◽  
W. Mette ◽  
U. Struck ◽  
C. Korte
Keyword(s):  
Carbon Isotope ◽  
Southern Alps ◽  
Late Permian ◽  
Current Event ◽  
Triassic Boundary ◽  
Shallow Marine ◽  
Carbonate Carbon ◽  
Biostratigraphic Correlation ◽  
Positive Peak ◽  
Permian Triassic Boundary

Carbonate carbon-isotope values from the Permian–Triassic (P–T) boundary section at Seis/Siusi (Southern Alps, Italy) show a trend similar to that in numerous other P–T boundary sections worldwide. Values decrease from 3.2‰ (V-PDB) in the upper <i>Bellerophon</i> Limestone Formation (Late Permian) to a minimum of –1.7‰ in the lower Mazzin Member. This minimum may represent the P–T boundary. The overall declining carbon-isotope trend is interrupted by a ca. 1‰ positive excursion in the higher Tesero Oolite Horizon. This positive peak is located at a higher lithostratigraphic level than a comparable peak in the adjacent Pufels section, which suggests that the Tesero Oolite Horizon in the Seis section is stratigraphically slightly older than in the Pufels section, and this is also suggested by palaeomagnetic correlation. It is therefore concluded that the base of the Tesero Oolite Horizon does not reflect a synchronous "current event" but is slightly diachronous, a result that was previously shown by biostratigraphic correlation. Nevertheless, this suggestion should be verified by further detailed litho-, magneto- and chemostratigraphic analysis of other P–T sections in the Southern Alps. <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.200900007" target="_blank">10.1002/mmng.200900007</a>

Organic carbon isotopes in terrestrial Permian-Triassic boundary sections of North China: Implications for global carbon cycle perturbations

2019 ◽  
Vol 132 (5-6) ◽  
pp. 1106-1118 ◽  
Author(s):  
Yuyang Wu ◽  
Jinnan Tong ◽  
Thomas J. Algeo ◽  
Daoliang Chu ◽  
Ying Cui ◽  
...  
Keyword(s):  
High Resolution ◽  
Carbon Cycle ◽  
Carbon Isotope ◽  
North China ◽  
Global Carbon Cycle ◽  
Middle Part ◽  
Triassic Boundary ◽  
Permian Mass Extinction ◽  
Permian Triassic Boundary ◽  
Global Carbon

Abstract The end-Permian mass extinction (ca. 252 Ma) represents the most severe biotic crisis of the Phanerozoic, and it was accompanied by profound environmental perturbations, especially to the global carbon cycle, as indicated by sharp negative carbon isotope excursions (CIE) in both carbonates (δ13Ccarb) and organic matter (δ13Corg). To date, carbon isotope records are mostly from marine Permian-Triassic transitional sequences with relatively few high-resolution carbon isotope profiles having been generated for terrestrial facies. Terrestrial Permian-Triassic sequences suitable for high-resolution carbon isotope study are rare globally and are difficult to correlate with better-studied marine sequences. However, carbon isotope records from continental facies are essential to a full understanding of global carbon cycle changes during the Permian-Triassic transition. Here, we present bulk δ13Corg profiles for three terrestrial sections in North China representing Permian-Triassic transitional beds. These profiles exhibit similar patterns of secular variation defining three stages: (1) a pre-CIE interval, (2) a CIE interval, characterized by a rapid negative shift of 1.7‰–2.2‰ within the middle part of the Sunjiagou Formation, and (3) a post-CIE interval. The similarity of the CIE in all three study sections facilitates correlations among them, and its presence in the Permian-Triassic transitional beds suggests that it is equivalent to the negative CIE at the Permian-Triassic boundary in the Meishan global stratotype section and point (GSSP) and in coeval marine and terrestrial sections globally. The end-Permian CIE was probably triggered by a massive release of 13C-depleted carbon from volcanogenic sources leading to elevated atmospheric pCO2, although oceanic sources of CO2 cannot be ruled out at present.

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