Isua Greenstone Belt
E804854
The Isua Greenstone Belt is one of the oldest known rock formations on Earth, preserving early Archean crust and some of the earliest evidence of geological and possibly biological activity.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Isua Greenstone Belt canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T9504179 — 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: Isua Greenstone Belt Context triple: [Eoarchean Era, hasRockRecord, Isua Greenstone Belt]
-
A.
Nuvvuagittuq Greenstone Belt
The Nuvvuagittuq Greenstone Belt is an ancient rock formation in northern Quebec, Canada, that contains some of the oldest known rocks on Earth, offering key insights into early crustal evolution and the conditions on the young planet.
-
B.
Lufilian Belt
The Lufilian Belt is a major Neoproterozoic mountain belt in south-central Africa, renowned for its rich copper-cobalt mineralization and its role in the tectonic evolution of the Congo and Kalahari cratons.
-
C.
Barberton Greenstone Belt
The Barberton Greenstone Belt is one of the oldest and best-preserved pieces of Earth’s early continental crust, renowned for its Archean volcanic and sedimentary rocks that provide key evidence about the planet’s early geological and biological history.
-
D.
Acasta Gneiss Complex
The Acasta Gneiss Complex is one of the oldest known rock formations on Earth, consisting of highly metamorphosed ancient continental crust located in the Canadian Shield of Northwest Territories, Canada.
-
E.
Grenville orogenic belt
The Grenville orogenic belt is a vast, ancient mountain-building region in eastern North America and beyond, formed over a billion years ago and representing one of the major Precambrian collisional events in Earth’s history.
- 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: Isua Greenstone Belt Target entity description: The Isua Greenstone Belt is one of the oldest known rock formations on Earth, preserving early Archean crust and some of the earliest evidence of geological and possibly biological activity.
-
A.
Nuvvuagittuq Greenstone Belt
The Nuvvuagittuq Greenstone Belt is an ancient rock formation in northern Quebec, Canada, that contains some of the oldest known rocks on Earth, offering key insights into early crustal evolution and the conditions on the young planet.
-
B.
Lufilian Belt
The Lufilian Belt is a major Neoproterozoic mountain belt in south-central Africa, renowned for its rich copper-cobalt mineralization and its role in the tectonic evolution of the Congo and Kalahari cratons.
-
C.
Barberton Greenstone Belt
The Barberton Greenstone Belt is one of the oldest and best-preserved pieces of Earth’s early continental crust, renowned for its Archean volcanic and sedimentary rocks that provide key evidence about the planet’s early geological and biological history.
-
D.
Acasta Gneiss Complex
The Acasta Gneiss Complex is one of the oldest known rock formations on Earth, consisting of highly metamorphosed ancient continental crust located in the Canadian Shield of Northwest Territories, Canada.
-
E.
Grenville orogenic belt
The Grenville orogenic belt is a vast, ancient mountain-building region in eastern North America and beyond, formed over a billion years ago and representing one of the major Precambrian collisional events in Earth’s history.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
Archean terrane
ⓘ
geological formation ⓘ greenstone belt ⓘ |
| contains |
banded iron formation layers
ⓘ
carbonaceous sediments ⓘ deformed and metamorphosed volcanic-sedimentary sequences ⓘ graphitic carbon inclusions ⓘ isotopically light carbon ⓘ metacherts ⓘ pillow basalts ⓘ rare earth element-enriched rocks ⓘ |
| containsRocksDatedTo | about 3.8 billion years old ⓘ |
| country | Greenland ⓘ |
| discoveredBy | geologists in the 1960s ⓘ |
| evidenceFor |
early biosignatures
ⓘ
early hydrosphere ⓘ early oceanic crust ⓘ early plate tectonic-style deformation ⓘ early subduction-like processes ⓘ |
| geologicalAge | Archean Eon ⓘ |
| hasDebatedInterpretations |
biogenic origin of carbon isotopic signatures
ⓘ
evidence for early plate tectonics ⓘ |
| locatedIn | southwestern Greenland ⓘ |
| locatedNear |
Isukasia
ⓘ
linked to:
Aasiaat
Nuuk ⓘ |
| locatedOn |
North Atlantic craton
ⓘ
linked to:
North Atlantic Craton
|
| maximumAge | about 3.8 billion years ⓘ |
| metamorphicGrade | amphibolite facies ⓘ |
| minimumAge | about 3.7 billion years ⓘ |
| overlies | older tonalite–trondhjemite–granodiorite gneisses ⓘ |
| partOf |
North Atlantic craton
ⓘ
linked to:
North Atlantic Craton
|
| preservationState | strongly metamorphosed but retaining primary structures ⓘ |
| rockType |
banded iron formations
ⓘ
gneiss ⓘ mafic volcanic rocks ⓘ metasedimentary rocks ⓘ sedimentary rocks ⓘ ultramafic volcanic rocks ⓘ |
| significance |
contains some of the oldest known supracrustal rocks
ⓘ
important for studies of early Earth conditions ⓘ important for studies of early life on Earth ⓘ important for studies of early plate tectonics ⓘ one of the oldest known rock formations on Earth ⓘ preserves early Archean continental crust ⓘ records some of the earliest known geological activity on Earth ⓘ |
| structuralStyle | highly deformed and folded ⓘ |
| studiedFor |
early Earth geodynamics
ⓘ
early atmosphere and ocean composition ⓘ origin of life ⓘ |
| tectonicSetting | Archean greenstone belt complex ⓘ |
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: Isua Greenstone Belt Description of subject: The Isua Greenstone Belt is one of the oldest known rock formations on Earth, preserving early Archean crust and some of the earliest evidence of geological and possibly biological activity.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.