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Exploring the nature and extent of the Mesoproterozoic Picuris Orogeny in Colorado, USA

Yvette D. Kuiper, Ruth F. Aronoff, Christopher G. Daniel and Madison Bzdok
Exploring the nature and extent of the Mesoproterozoic Picuris Orogeny in Colorado, USA (in Field excursions in the Front Range and Wet Mountains of Colorado for GSA Connects 2022, Kevin H. Mahan (editor) and Lynne Carpenter (editor))
Field Guide (Geological Society of America) (September 2022) 64: 17-38

Abstract

The Mesoproterozoic is a controversial time within the Earth's history, and is characterized by high temperature/pressure ratios in metamorphic rocks, a large volume of extensional plutons, very few economic mineral deposits, and possibly a slowdown in plate tectonic processes. In Laurentia, ca. 1.48-1.35 Ga is well known as a time of voluminous ferroan magmatism, which led to conflicting tectonic interpretations that range from continental extension to convergent margin settings. Recently, a ca. 1.50-1.35 Ga orogenic belt was proposed that spanned Laurentia from present-day eastern Canada to the southwestern United States. Unlike the preceding Paleoproterozoic Yavapai/Mazatzal orogenies and the subsequent late Mesoproterozoic Grenville orogeny, the early-mid-Mesoproterozoic Picuris orogeny in the southwestern United States was relatively unrecognized until about two decades ago, when geochronology data and depositional age constraints became more abundant. In multiple study areas of Arizona and New Mexico, deposition, metamorphism, and deformation previously ascribed to the Yavapai/Mazatzal orogenies proved to be part of the ca. 1.4 Ga Picuris orogeny. In Colorado, the nature and extent of the Picuris orogeny is poorly understood. On this trip, we discuss new evidence for the Picuris orogeny in the central Colorado Front Range, from Black Hawk in the central Colorado Front Range to the Wet Mountains, Colorado. We will discuss how the Picuris orogeny reactivated or overprinted earlier structures, and perhaps controlled the location of structures associated with Cambrian rifting, the Cretaceous-Paleogene Laramide orogeny, and the Rio Grande rift, and associated mineralization. We will also discuss whether and how the Picuris orogeny, and the Mesoproterozoic in general, were unique within the Earth's history.


ISSN: 2333-0937
EISSN: 2333-0945
Serial Title: Field Guide (Geological Society of America)
Serial Volume: 64
Title: Exploring the nature and extent of the Mesoproterozoic Picuris Orogeny in Colorado, USA
Title: Field excursions in the Front Range and Wet Mountains of Colorado for GSA Connects 2022
Author(s): Kuiper, Yvette D.Aronoff, Ruth F.Daniel, Christopher G.Bzdok, Madison
Author(s): Mahan, Kevin H.editor
Author(s): Carpenter, Lynneeditor
Affiliation: Colorado School of Mines, Department of Geology and Geological Engineering, Golden, CO, United States
Affiliation: University of Colorado at Boulder, Department of Geological Sciences, Boulder, CO, United States
Pages: 17-38
Published: 20220926
Text Language: English
Publisher: Geological Society of America, Boulder, CO, United States
ISBN: 9780813756646
ISBN: 9780813700649
References: 116
Accession Number: 2023-061031
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N37°45'00" - N38°15'00", W105°19'60" - W104°58'00"
Secondary Affiliation: Furman University, USA, United StatesBucknell University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2024, American Geosciences Institute.
Update Code: 202337
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