Lomagundi event
E843363
The Lomagundi event was a prolonged Paleoproterozoic episode of unusually high carbon isotope ratios in marine carbonates, interpreted as evidence for a major global increase in oxygen production and organic carbon burial.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Lomagundi event canonical | 1 |
| Lomagundi–Jatuli event | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10138357 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Lomagundi event Context triple: [Lomagundi–Jatuli carbon isotope excursion, alsoKnownAs, Lomagundi event]
-
A.
Great Oxidation Event
The Great Oxidation Event was a pivotal period in Earth’s early history when atmospheric oxygen levels rose dramatically due to photosynthetic microorganisms, fundamentally transforming the planet’s environment and biosphere.
-
B.
Sturtian glaciation
The Sturtian glaciation was a major global ice age during the Neoproterozoic, when extensive ice sheets may have covered much of Earth’s surface in one of the most severe glacial events in the planet’s history.
-
C.
Permian–Triassic mass extinction
The Permian–Triassic mass extinction was the most severe biodiversity crisis in Earth's history, wiping out the majority of marine and terrestrial species around 252 million years ago and marking the boundary between the Paleozoic and Mesozoic eras.
-
D.
Marinoan glaciation
The Marinoan glaciation was a major Neoproterozoic ice age, likely a global or near-global “Snowball Earth” event that occurred around 650–635 million years ago.
-
E.
Huronian glaciation
The Huronian glaciation was one of Earth's earliest and longest ice ages, occurring over 2.4 billion years ago and likely linked to the Great Oxidation Event and major climatic shifts.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Lomagundi event Target entity description: The Lomagundi event was a prolonged Paleoproterozoic episode of unusually high carbon isotope ratios in marine carbonates, interpreted as evidence for a major global increase in oxygen production and organic carbon burial.
-
A.
Great Oxidation Event
The Great Oxidation Event was a pivotal period in Earth’s early history when atmospheric oxygen levels rose dramatically due to photosynthetic microorganisms, fundamentally transforming the planet’s environment and biosphere.
-
B.
Sturtian glaciation
The Sturtian glaciation was a major global ice age during the Neoproterozoic, when extensive ice sheets may have covered much of Earth’s surface in one of the most severe glacial events in the planet’s history.
-
C.
Permian–Triassic mass extinction
The Permian–Triassic mass extinction was the most severe biodiversity crisis in Earth's history, wiping out the majority of marine and terrestrial species around 252 million years ago and marking the boundary between the Paleozoic and Mesozoic eras.
-
D.
Marinoan glaciation
The Marinoan glaciation was a major Neoproterozoic ice age, likely a global or near-global “Snowball Earth” event that occurred around 650–635 million years ago.
-
E.
Huronian glaciation
The Huronian glaciation was one of Earth's earliest and longest ice ages, occurring over 2.4 billion years ago and likely linked to the Great Oxidation Event and major climatic shifts.
- F. None of above. chosen
Statements (39)
| Predicate | Object |
|---|---|
| instanceOf |
carbon isotope excursion
ⓘ
geological event ⓘ paleoclimatic event ⓘ |
| affects | marine carbonates ⓘ |
| associatedWith |
changes in global carbon cycle
ⓘ
long-term oxygenation of Earth’s surface environments ⓘ rise of atmospheric oxygen ⓘ |
| duration | on the order of 100 million years or more ⓘ |
| endTime | approximately 2.1 billion years ago ⓘ |
| fieldOfStudy |
Earth system science
ⓘ
geochemistry ⓘ geology ⓘ paleoclimatology ⓘ |
| follows | Great Oxidation Event NERFINISHED ⓘ |
| geologicTimePeriod | Paleoproterozoic ⓘ |
| hasCharacteristic |
large positive δ13C excursion
ⓘ
unusually high carbon isotope ratios in marine carbonates ⓘ |
| hasConsequence |
changes in ocean redox conditions
ⓘ
drawdown of volcanic and metamorphic CO2 ⓘ possible climatic cooling ⓘ |
| interpretedAsEvidenceFor |
enhanced organic carbon burial
ⓘ
major global increase in oxygen production ⓘ |
| involvesProcess |
burial of organic carbon in sediments
ⓘ
oxygenic photosynthesis ⓘ |
| linkedTo |
changes in sulfur and iron cycling
ⓘ
evolution of early aerobic ecosystems ⓘ |
| namedAfter |
Lomagundi district in Zimbabwe
NERFINISHED
ⓘ
Lomagundi region NERFINISHED ⓘ |
| recordedIn |
carbonate rock sequences
ⓘ
marine sedimentary basins ⓘ |
| relatedTo | Great Oxidation Event NERFINISHED ⓘ |
| scale | global ⓘ |
| startTime | approximately 2.3 billion years ago ⓘ |
| studiedUsing |
stable carbon isotope geochemistry
ⓘ
stratigraphic correlations ⓘ |
| temporalRelation |
occurs after initial rise of atmospheric O2 in the Paleoproterozoic
ⓘ
precedes later Proterozoic oxygenation events ⓘ |
| uncertainty |
exact duration and global synchronicity remain debated
ⓘ
magnitude of associated atmospheric O2 increase is uncertain ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Lomagundi event Description of subject: The Lomagundi event was a prolonged Paleoproterozoic episode of unusually high carbon isotope ratios in marine carbonates, interpreted as evidence for a major global increase in oxygen production and organic carbon burial.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Lomagundi–Jatuli event