scholarly journals The Steptoean Positive Carbon Isotope Excursion (SPICE), inorganic aragonite precipitation and seawater chemistry: Insights from the Middle ‐ Late Cambrian Port au Port Group, Newfoundland

2021 ◽  
Author(s):  
J.E. Neilson ◽  
R. Barili ◽  
A. Brasier ◽  
L.F. De Ros ◽  
S. Ledingham
Keyword(s):  
Carbon Isotope ◽  
Seawater Chemistry ◽  
Late Cambrian ◽  
Carbon Isotope Excursion

The geochemistry of the late Cambrian carbonate in North China: the Steptoean Positive Carbon Isotope Excursion (SPICE) record suppressed in a coastal condition?

2019 ◽  
Vol 156 (10) ◽  
pp. 1805-1819 ◽  
Author(s):  
Jing Huang ◽  
Yali Chen ◽  
Xuelei Chu ◽  
Tao Sun
Keyword(s):  
Sea Level ◽  
Carbon Isotope ◽  
North China ◽  
Coastal Environment ◽  
Sedimentary Records ◽  
Late Cambrian ◽  
Geochemical Proxies ◽  
Carbon Isotope Excursion ◽  
Globally Distributed ◽  
Shallow Coastal Environment

AbstractThe Steptoean Positive Carbon Isotope Excursion (SPICE) is globally distributed in late Cambrian sedimentary records but controversially heterogeneous in its magnitudes. Here we use multiple geochemical proxies to investigate the late Cambrian carbonates from the Tangwangzhai section in North China, which were deposited in a shallow coastal environment with three depositional sequences (S1–S3). Each sequence comprises a transgressive systems tract (TST) and a highstand systems tract (HST). The REE + Y and trace element records are consistent with the depositional condition and indicate that terrigenous influence was more significant in the TST than HST. δ13Ccarb and δ34SCAS are low in the TST relative to HST, consistent with the scenario that terrigenous inputs were profoundly aggressive to seawater by introducing 13C-depleted and 34S-depleted materials. Within the TST of S2, the SPICE excursion shows a scaled-down δ13Ccarb positive shift (∼1.7 ‰) relative to its general records (∼4–6 ‰); the corresponding δ34SCAS show no positive excursion. This ‘atypical’ SPICE record is attributed to enhanced 13C-depleted and 34S-depleted terrigenous influence during the TST, which would reduce the amplitude of δ13Ccarb excursion, and even obscure δ34SCAS excursion. Meanwhile the subaerial unconformity at the base of TST would also cause a partially missing and a ‘snapshot’ preservation. Our study confirms significant local influence to the SPICE records, and further supports the heterogeneity and low sulphate concentrations of the late Cambrian seawater, because of which the SPICE records may be vulnerable to specific depositional conditions (e.g. sea-level, terrigenous input).

scholarly journals The Furongian (late Cambrian) Steptoean Positive Carbon Isotope Excursion (SPICE) in Avalonia

2011 ◽  
Vol 168 (4) ◽  
pp. 851-862 ◽  
Author(s):  
Mark A. Woods ◽  
Philip R. Wilby ◽  
Melanie J. Leng ◽  
Adrian W.A. Rushton ◽  
Mark Williams
Keyword(s):  
Carbon Isotope ◽  
Late Cambrian ◽  
Carbon Isotope Excursion

A global carbon isotope excursion (SPICE) during the Late Cambrian: relation to trilobite extinctions, organic-matter burial and sea level

2000 ◽  
Vol 162 (3-4) ◽  
pp. 211-223 ◽  
Author(s):  
Matthew R. Saltzman ◽  
Robert L. Ripperdan ◽  
M.D. Brasier ◽  
Kyger C. Lohmann ◽  
Richard A. Robison ◽  
...  
Keyword(s):  
Organic Matter ◽  
Sea Level ◽  
Carbon Isotope ◽  
Late Cambrian ◽  
Carbon Isotope Excursion ◽  
Global Carbon ◽  
And Sea Level
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