Faculty Mentor

Chad Pritchard

Presentation Type

Poster

Primary Discipline of Presentation

Geosciences

Abstract

The Saltese Upland Conservation Area provides a window into

the Priest River Core Complex with Lake Hauser gneiss grading

to migmatite, garnet-baring amphibolite juxtaposed with

felsite to orthogneiss rocks. U/Pb ages from LA-ICP-MS of

separated zircon grains show trends very similar to detrital

207Pb/206Pb ages of the Belt Supergroup. The amphibolite

displays a much stronger peak at 1.4 to 1.5 Ga , possibly related

to the emplacement of Mesoproterozoic dikes. The

amphibolite and granitic rocks also contain a number of grains

with 238U/206Pb around 60 Ma preserving events from the

uplift of the Priest River Complex in the Spokane area. The

Saltese Uplands are a very common location for sharing natural

sciences to the public, so these results help decipher the history

of a part of the Priest River Core Complex and also provide data

and support to develop a story for the public to understand

complex geologic areas.

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U/Pb zircon ages of Saltese Upland Conservation Area, Priest River Core Complex

The Saltese Upland Conservation Area provides a window into

the Priest River Core Complex with Lake Hauser gneiss grading

to migmatite, garnet-baring amphibolite juxtaposed with

felsite to orthogneiss rocks. U/Pb ages from LA-ICP-MS of

separated zircon grains show trends very similar to detrital

207Pb/206Pb ages of the Belt Supergroup. The amphibolite

displays a much stronger peak at 1.4 to 1.5 Ga , possibly related

to the emplacement of Mesoproterozoic dikes. The

amphibolite and granitic rocks also contain a number of grains

with 238U/206Pb around 60 Ma preserving events from the

uplift of the Priest River Complex in the Spokane area. The

Saltese Uplands are a very common location for sharing natural

sciences to the public, so these results help decipher the history

of a part of the Priest River Core Complex and also provide data

and support to develop a story for the public to understand

complex geologic areas.