Unscrambling the Proterozoic supercontinent record of northeastern Washington State, USA

Author:

Brennan Daniel T.1,Box Stephen E.2,Eyster Athena3

Affiliation:

1. Montana Bureau of Mines and Geology, Montana Technological University, 1300 West Park Street, Butte, Montana 59701, USA

2. U.S. Geological Survey, 904 West Riverside Avenue, Spokane, Washington 99201, USA

3. Earth and Climate Sciences Department, Tufts University, 419 Boston Avenue, Medford, Massachusetts 02155, USA

Abstract

ABSTRACT The time interval from Supercontinent Nuna assembly in the late Paleoproterozoic to Supercontinent Rodinia breakup in the Neoproterozoic is considered by some geologists to comprise the “Boring Billion,” an interval possibly marked by a slowdown in plate tectonic processes. In northeastern Washington State, USA, similar to much of western Laurentia, early workers generally thought the tectonostratigraphic framework of this interval of geologic time consisted of two major sequences, the (ca. 1480–1380 Ma) Mesoproterozoic Belt Supergroup and unconformably overlying (<720 Ma) Neoproterozoic Windermere Supergroup. However, recent research indicates that strata considered by early workers as Belt Supergroup equivalents are actually younger, and a post-Belt, pre-Windermere record is present within the <1360 Ma Deer Trail Group and <760 Ma Buffalo Hump Formation. Thus, the northeastern Washington region perhaps comprises the most complete stratigraphic record of the “Boring Billion” time interval in the northwestern United States and holds important insights into global Proterozoic supercontinent tectonic processes. In light of these exciting developments, this field guide will address the early historic economic geology and original mapping of these Proterozoic sequences in the northeastern Washington region, and from that foundation explore more recent isotopic provenance data and their regional to global context. Finally, the guide will end with a discussion of remaining questions with a goal of stimulating interest in these relatively understudied, yet important, rocks.

Publisher

Geological Society of America

Reference158 articles.

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4. An hypothesis for an Australian-Canadian connection in the Late Proterozoic and the birth of the Pacific Ocean;Bell,;Pacific Rim Congress 87, Proceedings, Gold Coast, Queensland,1987

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