Lomagundi excursion
E843364
The Lomagundi excursion is a major Paleoproterozoic carbon isotope anomaly reflecting a prolonged global increase in organic carbon burial and atmospheric oxygen levels.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Lomagundi excursion canonical | 1 |
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
Paleoproterozoic geological event
ⓘ
carbon isotope anomaly ⓘ carbon isotope excursion ⓘ |
| affects |
atmospheric oxygen concentration
ⓘ
global carbon cycle ⓘ redox state of the oceans ⓘ |
| associatedWith | Great Oxidation Event NERFINISHED ⓘ |
| characterizedBy |
elevated atmospheric oxygen levels
ⓘ
global-scale positive δ13C anomaly ⓘ large positive carbon isotope values in marine carbonates ⓘ prolonged increase in organic carbon burial ⓘ |
| duration | on the order of 100 million years or more ⓘ |
| endTime | approximately 2.06 billion years ago ⓘ |
| evidenceType |
carbon isotope ratios in marine carbonate rocks
ⓘ
δ13C measurements of carbonate and organic carbon ⓘ |
| follows | initial rise of atmospheric oxygen in the Great Oxidation Event ⓘ |
| geologicalAge | Paleoproterozoic Eon NERFINISHED ⓘ |
| hasConsequence |
long-term shift in surface environment redox conditions
ⓘ
possible expansion of habitable niches for early life ⓘ |
| hasMagnitude | δ13Ccarb values commonly exceeding +10‰ ⓘ |
| interpretedAs |
evidence for large-scale organic carbon sequestration
ⓘ
interval of enhanced net oxygen production ⓘ |
| linkedToProcess |
enhanced burial of organic carbon in sediments
ⓘ
long-term oxygen accumulation in the atmosphere-ocean system ⓘ oxidation of reduced volcanic and crustal gases ⓘ |
| namedAfter | Lomagundi region in Zimbabwe NERFINISHED ⓘ |
| recordedIn |
Lomagundi Group of Zimbabwe
NERFINISHED
ⓘ
Paleoproterozoic sedimentary basins ⓘ |
| relatedConcept |
Earth oxygenation events
ⓘ
carbon isotope stratigraphy ⓘ organic carbon burial feedbacks ⓘ |
| relevance |
constrains timing of atmospheric oxygenation
ⓘ
informs models of early Earth habitability ⓘ used to calibrate Paleoproterozoic stratigraphy ⓘ |
| spatialExtent | global ⓘ |
| startTime | approximately 2.22 billion years ago ⓘ |
| studiedInDiscipline |
geochemistry
ⓘ
paleoclimatology ⓘ sedimentary geology ⓘ |
| temporalRelation |
postdates onset of the Great Oxidation Event
ⓘ
precedes later Paleoproterozoic decline in δ13C values ⓘ |
| uncertainty |
exact duration is debated
ⓘ
mechanisms driving the anomaly are debated ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.