closure of Iapetus Ocean

E87796

Paleozoic orogeny ocean closure tectonic event

The closure of the Iapetus Ocean was a major Paleozoic tectonic event in which ancient continental plates converged, leading to the formation of mountain belts such as the Appalachians and Caledonides.

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All labels observed (3)

Label	Occurrences
Iapetus Ocean closure	1
closure of Iapetus Ocean canonical	1
closure of the Iapetus Ocean	1

How this entity was disambiguated

This entity first appeared as the object of triple T738745 — 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: closure of Iapetus Ocean
Context triple: [Paleozoic Era, tectonicActivity, closure of Iapetus Ocean]

A. Scotia Plate
The Scotia Plate is a small tectonic plate in the South Atlantic Ocean, located between the South American and Antarctic Plates and associated with the complex plate boundaries and seismic activity of the Scotia Sea region.
B. breakup of Gondwana
The breakup of Gondwana was a major tectonic event during the Mesozoic era in which the ancient southern supercontinent fragmented into the continents and oceanic plates of the Southern Hemisphere, reshaping global geography and climate.
C. Gorda Plate
The Gorda Plate is a small tectonic plate off the coast of northern California that forms part of the complex plate boundary system between the Pacific and North American Plates.
D. Bornholm Basin
Bornholm Basin is a deep, low-oxygen sub-basin in the southern Baltic Sea that plays a key role in the region’s water exchange and marine ecology.
E. Farallon Plate
The Farallon Plate was a large, ancient oceanic tectonic plate in the Pacific that has mostly subducted beneath the North American Plate, leaving only fragments such as the Juan de Fuca Plate.
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: closure of Iapetus Ocean
Target entity description: The closure of the Iapetus Ocean was a major Paleozoic tectonic event in which ancient continental plates converged, leading to the formation of mountain belts such as the Appalachians and Caledonides.

A. Scotia Plate
The Scotia Plate is a small tectonic plate in the South Atlantic Ocean, located between the South American and Antarctic Plates and associated with the complex plate boundaries and seismic activity of the Scotia Sea region.
B. breakup of Gondwana
The breakup of Gondwana was a major tectonic event during the Mesozoic era in which the ancient southern supercontinent fragmented into the continents and oceanic plates of the Southern Hemisphere, reshaping global geography and climate.
C. Gorda Plate
The Gorda Plate is a small tectonic plate off the coast of northern California that forms part of the complex plate boundary system between the Pacific and North American Plates.
D. Bornholm Basin
Bornholm Basin is a deep, low-oxygen sub-basin in the southern Baltic Sea that plays a key role in the region’s water exchange and marine ecology.
E. Farallon Plate
The Farallon Plate was a large, ancient oceanic tectonic plate in the Pacific that has mostly subducted beneath the North American Plate, leaving only fragments such as the Juan de Fuca Plate.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	Paleozoic orogeny ⓘ ocean closure ⓘ tectonic event ⓘ
endTime	Devonian Period ⓘ middle Paleozoic ⓘ
followedBy	assembly of Pangaea ⓘ opening of Rheic Ocean ⓘ
follows	opening of Iapetus Ocean ⓘ
geologicalContext	Wilson cycle ⓘ
hasCause	plate convergence ⓘ subduction of oceanic lithosphere ⓘ
hasEffect	collision of Laurentia and Avalonia ⓘ collision of Laurentia and Baltica ⓘ continental suturing ⓘ crustal thickening ⓘ deformation of passive margin sediments ⓘ development of major suture zones ⓘ formation of Appalachian Mountains ⓘ formation of Caledonian Mountains ⓘ formation of Euramerica ⓘ formation of Grampian Highlands ⓘ formation of Laurussia ⓘ formation of Scandinavian Caledonides ⓘ granite magmatism ⓘ regional metamorphism ⓘ
involves	Avalonia ⓘ Baltica ⓘ Laurentia ⓘ microcontinents ⓘ
location	present-day British Isles ⓘ present-day Greenland ⓘ present-day Scandinavia ⓘ present-day eastern North America ⓘ proto-Atlantic region ⓘ
occursIn	Paleozoic Era ⓘ
partOf	Acadian orogeny ⓘ Appalachian orogeny ⓘ Caledonian orogeny ⓘ Grampian orogeny ⓘ linked to: Caledonian orogeny Taconic orogeny ⓘ assembly of Euramerica ⓘ assembly of Laurussia ⓘ
precededBy	rifting of Rodinia margins ⓘ
startTime	Ordovician Period ⓘ early Paleozoic ⓘ
studiedIn	metamorphic geology ⓘ paleogeography ⓘ structural geology ⓘ tectonics ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Paleozoic Era → tectonicActivity → closure of Iapetus Ocean ⓘ

Greenland Caledonides → relatedTo → Iapetus Ocean closure ⓘ

linked to: closure of Iapetus Ocean

Walls Boundary Fault → formedDuring → closure of the Iapetus Ocean ⓘ