Lomagundi–Jatuli carbon isotope excursion
E226917
Paleoproterozoic geological event
carbon isotope excursion
global biogeochemical perturbation
paleoclimatic event
The Lomagundi–Jatuli carbon isotope excursion was a major global perturbation in the carbon cycle during the Paleoproterozoic, marked by unusually high carbon isotope ratios that suggest prolonged burial of organic carbon and significant changes in Earth’s atmosphere and oceans.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Lomagundi–Jatuli carbon isotope excursion canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2029564 — 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–Jatuli carbon isotope excursion Context triple: [Paleoproterozoic Era, containsEvent, Lomagundi–Jatuli carbon isotope excursion]
-
A.
Eocene–Oligocene climate transition
The Eocene–Oligocene climate transition was a major global cooling event around 34 million years ago that marked the shift from a greenhouse to an icehouse Earth, including the formation of large Antarctic ice sheets.
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B.
Magnesian Limestone succession
The Magnesian Limestone succession is a geological sequence of Permian-age dolomitic limestone formations that forms a distinctive belt across parts of northern and central England.
-
C.
On the Imperfection of the Geological Record
"On the Imperfection of the Geological Record" is a chapter in Charles Darwin's *On the Origin of Species* that addresses why the fossil record is incomplete and how this affects evidence for evolutionary change.
-
D.
Global Boundary Stratotype Section and Point at Klonk, Czech Republic
The Global Boundary Stratotype Section and Point at Klonk in the Czech Republic is a formally designated geological reference site that marks the internationally agreed base of the Devonian System and serves as a key standard for correlating Early Devonian rock strata worldwide.
-
E.
Gauss–Matuyama geomagnetic reversal
The Gauss–Matuyama geomagnetic reversal was a major event in Earth's history when the planet's magnetic field flipped polarity around 2.6 million years ago, marking a key boundary used in geological time scales.
- 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–Jatuli carbon isotope excursion Target entity description: The Lomagundi–Jatuli carbon isotope excursion was a major global perturbation in the carbon cycle during the Paleoproterozoic, marked by unusually high carbon isotope ratios that suggest prolonged burial of organic carbon and significant changes in Earth’s atmosphere and oceans.
-
A.
Eocene–Oligocene climate transition
The Eocene–Oligocene climate transition was a major global cooling event around 34 million years ago that marked the shift from a greenhouse to an icehouse Earth, including the formation of large Antarctic ice sheets.
-
B.
Magnesian Limestone succession
The Magnesian Limestone succession is a geological sequence of Permian-age dolomitic limestone formations that forms a distinctive belt across parts of northern and central England.
-
C.
On the Imperfection of the Geological Record
"On the Imperfection of the Geological Record" is a chapter in Charles Darwin's *On the Origin of Species* that addresses why the fossil record is incomplete and how this affects evidence for evolutionary change.
-
D.
Global Boundary Stratotype Section and Point at Klonk, Czech Republic
The Global Boundary Stratotype Section and Point at Klonk in the Czech Republic is a formally designated geological reference site that marks the internationally agreed base of the Devonian System and serves as a key standard for correlating Early Devonian rock strata worldwide.
-
E.
Gauss–Matuyama geomagnetic reversal
The Gauss–Matuyama geomagnetic reversal was a major event in Earth's history when the planet's magnetic field flipped polarity around 2.6 million years ago, marking a key boundary used in geological time scales.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Paleoproterozoic geological event
ⓘ
carbon isotope excursion ⓘ global biogeochemical perturbation ⓘ paleoclimatic event ⓘ |
| affects |
Earth’s atmosphere
ⓘ
Earth’s oceans ⓘ |
| alsoKnownAs |
Lomagundi event
ⓘ
Lomagundi excursion ⓘ Lomagundi event ⓘ
surface form:
Lomagundi–Jatuli event
|
| approximateAgeRange | 2.3–2.0 billion years ago ⓘ |
| associatedWith |
carbonate platform development
ⓘ
changes in ocean redox conditions ⓘ rise in atmospheric O2 ⓘ sulfur cycle perturbations ⓘ |
| characterizedBy |
global-scale carbon cycle perturbation
ⓘ
positive δ13C values ⓘ unusually high carbon isotope ratios in marine carbonates ⓘ |
| duration | tens of millions of years ⓘ |
| evidenceType | stable carbon isotope measurements ⓘ |
| geologicalAge |
Paleoproterozoic Era
ⓘ
surface form:
Paleoproterozoic Eon
|
| hasCauseHypothesis |
enhanced weathering of continental crust
ⓘ
increased primary productivity ⓘ tectonic reorganization ⓘ |
| hasConsequenceHypothesis |
changes in nutrient cycles
ⓘ
long-term oxygenation of surface environments ⓘ |
| indicates |
changes in atmospheric oxygen levels
ⓘ
enhanced organic carbon sequestration ⓘ prolonged burial of organic carbon ⓘ |
| linkedTo |
changes in global carbon reservoirs
ⓘ
evolution of early aerobic ecosystems ⓘ |
| nameOrigin |
Fennoscandia
ⓘ
surface form:
Jatulian Group in Fennoscandia
Lomagundi region in Zimbabwe ⓘ |
| precededBy | Great Oxidation Event ⓘ |
| recordedIn |
Paleoproterozoic sedimentary successions
ⓘ
marine carbonate rocks ⓘ |
| relatedTo | Great Oxidation Event ⓘ |
| scale | multi-million-year excursion ⓘ |
| spatialExtent | global ⓘ |
| studiedInDiscipline |
Earth system science
ⓘ
geochemistry ⓘ geology ⓘ paleoclimatology ⓘ |
| temporalRelation |
postdates initial rise of atmospheric oxygen
ⓘ
predates later Proterozoic oxygenation events ⓘ |
| usedAs | chemostratigraphic marker ⓘ |
| usedFor | correlation of Paleoproterozoic sedimentary sequences ⓘ |
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–Jatuli carbon isotope excursion Description of subject: The Lomagundi–Jatuli carbon isotope excursion was a major global perturbation in the carbon cycle during the Paleoproterozoic, marked by unusually high carbon isotope ratios that suggest prolonged burial of organic carbon and significant changes in Earth’s atmosphere and oceans.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.