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LITHOEN

Geological event

Muskox–Mackenzie magmatic event

A magmatic episode at about 1.27 billion years ago on the northwestern Canadian Shield, comprising the Muskox intrusion, the Mackenzie dyke swarm and the Coppermine River continental flood basalts, which the USGS chromite model treats as coeval and possibly cogenetic.

Classification

event kind
magmatic
timing resolution
geochronologicallyConstrained

How this record is known

1
Settled consensus
Cited as the accepted position of the discipline.

1 of 1 claims on this page cite at least one registered source. Counts describe how each statement is known, not how likely it is to be true.

What Lithoen records

Each claim states how it is known and cites its evidence.

Established1,270 Ma before present

The USGS stratiform chromite model dates the emplacement of the Muskox intrusion, the Mackenzie dyke swarm and the Coppermine River flood basalts on the northwestern Canadian Shield to about 1.27 billion years ago.

Not stated verbatim by the source — derived: 1.27 Ga x 1000 Ma/Ga = 1270 Ma

The report gives 1.27 Ga for the intrusion, the dyke swarm and the flood basalts alike; Lithoen stores geologic ages in Ma and the conversion is exact.

  • method: Geochronology as reported by the USGS deposit model, which gives the age as approximate and does not state the method or the uncertainty.
  • precision note: An age for the event as the source gives it. What exactly was dated — the whole body, one phase of it, one mineral — is not stated, and Lithoen does not supply an answer.

Evidence support: Derived from the cited evidence one source

Evidence: Schulte 2012 Primary authority

In the knowledge graph

Record last updated 2026-09-07. Corrections follow the published corrections policy; superseded claims are retained, never silently edited.