Carbon and carbon isotope mass balance in the Neoproterozoic Earth system
نویسندگان
چکیده
منابع مشابه
Neoproterozoic glaciation in the Earth System
The Neoproterozoic contains severe glacial intervals (750–580 Ma) including two extending to low palaeomagnetic latitudes. Paucity of radiometric dates indicates the need for chronostratigraphic tools. Whereas the marine Sr/Sr signatures show a steady rise, C fluctuates, the most reproducible variations being negative signatures in carbonate caps to glacial units, but more diagenetic work is ne...
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The carbon budget and dynamics of the Earth's interior, including the core, are currently very poorly understood. Diamond-bearing, mantle-derived rocks show a very well defined peak at δ(13)C ≈ -5 ± 3‰ with a very broad distribution to lower values (∼-40‰). The processes that have produced the wide δ(13)C distributions to the observed low δ(13)C values in the deep Earth have been extensively de...
متن کاملDynamics of the Neoproterozoic carbon cycle.
The existence of unusually large fluctuations in the Neoproterozoic (1,000-543 million years ago) carbon-isotopic record implies strong perturbations to the Earth's carbon cycle. To analyze these fluctuations, we examine records of both the isotopic content of carbonate carbon and the fractionation between carbonate and marine organic carbon. Together, these are inconsistent with conventional, ...
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An unusual richness of biogeochemical events is recorded in Neoproterozoic– Cambrian strata of the Death Valley region, California, United States. Eight negative carbon isotope (d13C) excursions are found in carbonate units between 1.08 Ga and the Precambrian/Cambrian boundary; four of these excursions occur in carbonates that contain textural features similar to those found globally in postgla...
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We present carbon and oxygen isotopic data on carbonates along three profiles of the Neoproterozoic Bambuı́ group in central Brazil. This unit covers an area of more than 300 000 km and comprises carbonate–silicliclastic sediments at the base that grade into siliciclastic sediments towards the top. The Bambuı́ group overlies by unconformity the Paranoá group, which consists mostly of siltstone, q...
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ژورنال
عنوان ژورنال: Emerging Topics in Life Sciences
سال: 2018
ISSN: 2397-8554,2397-8562
DOI: 10.1042/etls20170170