scholarly journals Marine anoxia and sedimentary mercury enrichments during the Late Cambrian SPICE event in northern Scotland

Geology ◽  
2019 ◽  
Vol 47 (5) ◽  
pp. 475-478 ◽  
Author(s):  
Sara B. Pruss ◽  
David S. Jones ◽  
David A. Fike ◽  
Nicholas J. Tosca ◽  
Paul B. Wignall
Keyword(s):  
Late Cambrian ◽  
Spice Event

Evidence of a large δ13Ccarb and δ13Corg depth gradient for deep-water anoxia during the late Cambrian SPICE event

Geology ◽  
2018 ◽  
Vol 46 (7) ◽  
pp. 631-634 ◽  
Author(s):  
Dandan Li ◽  
Xiaolin Zhang ◽  
Dongping Hu ◽  
Xiaoyan Chen ◽  
Wei Huang ◽  
...  
Keyword(s):  
Deep Water ◽  
Depth Gradient ◽  
Late Cambrian ◽  
Spice Event

Questioning a widespread euxinia for the Furongian (Late Cambrian) SPICE event: indications from δ13C, δ18O, δ34S and biostratigraphic constraints

2015 ◽  
Vol 152 (6) ◽  
pp. 1085-1103 ◽  
Author(s):  
THOMAS WOTTE ◽  
HARALD STRAUSS
Keyword(s):  
Elemental Concentrations ◽  
Carbonate Carbon ◽  
Late Cambrian ◽  
Seawater Ph ◽  
Carbon Isotope Excursion ◽  
Sulphate Sulphur ◽  
Almost All ◽  
Spice Event ◽  
Resolution Study ◽  
Peak Value

AbstractResults from a high-resolution study of δ13Ccarb, δ18Ocarb, δ34SCAS, δ34SCRSand elemental concentrations (Ca, Fe, Mg, Mn and Sr) in the Furongian Kyrshabakty section, southern Kazakhstan, are reported here. The investigated interval covers the Drumian to Jiangshanian stages of the Cambrian Period, respectively the regionalPtychagnostus atavustoIvshinagnostus ivshini-Irvingella majortrilobite zones. δ13Ccarbdata include the Steptoean positive carbon isotope excursion (SPICE) with a local peak value of +5‰. The onset of SPICE corresponds to theKormagnostus simplex–Glyptagnostus stolidotuszones and pre-dates the base of the Paibian Stage/Furongian Series. δ34SCASdata already increase during theLejopyge armatabiozone culminating in three positive excursions prior and after the SPICE maximum. Differences in onset, peak values and shape of the δ13Ccarband/or δ34SCASexcursions at Kyrshabakty, but also in almost all sections characterized by the SPICE, are pointing towards Furongian seawater that was low in sulphate concentration and heterogeneous in its carbonate carbon and sulphate sulphur isotopic composition. The occurrence of benthic faunal elements in almost all SPICE-related sections strongly supports oxygenated conditions at the seafloor, therefore excluding widespread anoxia or euxinia. Regional anoxic conditions are most probable. A positive δ18Ocarbexcursion parallel to the SPICE could probably be explained by a decline in seawater pH associated with a sea-level rise. Again, no euxinic conditions would be mandatory for explaining the SPICE event.

EVIDENCE FOR SULFIDIC SHOREFACE SETTINGS DURING THE LATE CAMBRIAN SPICE EVENT

2020 ◽  
Author(s):  
James Zambito ◽  
◽  
Lisa D. Haas ◽  
Poul Emsbo ◽  
Patrick I. McLaughlin
Keyword(s):  
Late Cambrian ◽  
Spice Event

Exotic facies episodes of a carbonate platform: implications for middle and late Cambrian ecosystems and impact of bioturbation in the Alborz Basin, Iran

2021 ◽  
pp. SP522-2020-269
Author(s):  
Aram Bayet-Goll ◽  
Mehdi Daraei ◽  
Gerd Geyer ◽  
Carlos Neto de Carvalho ◽  
Nasrin Bahrami
Keyword(s):  
Environmental Stress ◽  
Environmental Conditions ◽  
Carbonate Platform ◽  
Northern Iran ◽  
Virtual Absence ◽  
Late Cambrian ◽  
Physico Chemical ◽  
Stage 4 ◽  
Middle And Late Cambrian ◽  
Spice Event

AbstractThe sedimentological and ichnological data of the Mila Group in the Alborz Basin, northern Iran indicate that the appearance of exotic facies and resurgence of microbialites resulted from the development of extraordinary palaeoceanographic conditions with widespread environmental stress and enhanced precipitation of CaCO3. Inhospitable environmental conditions in the Mila Group platform led to a considerable reduction in ichnodiversity, bioturbation intensity, depth and size of burrows, which led to periods of dominating calcimicrobe ecology. The development of exotic, or anachronistic facies started around the Cambrian Stage 4-Wuliuan boundary, probably simultaneous with the SPICE event whereas the Furongian exotic facies period probably took place simultaneous with the HERB event. Biotic and physico-chemical changes in the ocean during these events may have led as well to the virtual absence of the mixed layer and infaunal ecospace utilisation in the deposits of the Mila Group. Nevertheless, the local presence of metazoan-microbial build-ups that established between the two suggested exotic facies developments indicates that these periods started at the Cambrian Stage 4-Wuliuan boundary interval, but a fluctuation of abnormal palaeoceanographic conditions and ambient normal marine conditions took place during the Miaolingian and Furongian in the Alborz Basin as a representative of northern Gondwanan margin.

Early Ordovician alkali-ultramafic Zhilandy complex (Central Kazakhstan): structure and age of formation

2019 ◽  
Vol 484 (1) ◽  
pp. 61-65
Author(s):  
R. M. Antonuk ◽  
A. A. Tretyakov ◽  
K. E. Degtyarev ◽  
A. B. Kotov
Keyword(s):  
Complex Formation ◽  
Central Asian Orogenic Belt ◽  
Early Cambrian ◽  
Early Ordovician ◽  
Late Cambrian ◽  
Central Asian ◽  
Geochronological Study ◽  
Three Stages ◽  
Late Neoproterozoic ◽  
Quartz Monzodiorites

U–Pb geochronological study of amphibole-bearing quartz monzodiorites of the alkali-ultramafic Zhilandy complex in Central Kazakhstan, whose formation is deduced at the Early Ordovician era (479 ± 3 Ma). The obtained data indicate three stages of intra-plate magmatism in the western part of the Central Asian Orogenic Belt: Late Neoproterozoic stage of alkali syenites of the Karsakpay complex intrusion, Early Cambrian stage of ultramafic-gabbroid plutons of the Ulutau complex formation, and Late Cambrian–Early Ordovician stage of formation of the Zhilandy complex and Krasnomay complex intrusions.

LINGULIFORM BRACHIOPODS ACROSS THE STEPTOEAN/SUNWAPTAN (LATE CAMBRIAN) “BIOMERE” BOUNDARY IN THE GREAT BASIN, USA

2017 ◽  
Author(s):  
Rebecca L. Freeman ◽  
◽  
James F. Miller ◽  
Kevin R. Evans ◽  
Damon J. Bassett
Keyword(s):  
Great Basin ◽  
Late Cambrian
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