Field Trips 2022, Proterozoic structures of the central Colorado Front Range

2022 Colorado Scientific Society Spring Field Trip

Tuesday, June 7, 2022 (all day)

Proterozoic structures of the central Colorado Front Range

Trip Leader: Yvette Kuiper, Colorado School of Mines

This field trip will focus on rocks and deformation associated with the Paleoproterozoic Yavapai/Mazatzal orogenies and the Mesoproterozoic Picuris orogeny in the central Colorado Front Range. We will discuss new evidence for the Picuris orogeny in the Black Hawk-Idaho Springs area. We will also examine some of the Cretaceous-Paleogene structures and mineralization, in particular in the Colorado School of Mines Edgar Mine.

Download The nature and extent of the Mesoproterozoic Picuris orogeny in Colorado
GSA Guidebook Kuiper et al May 9 2022_CSS (12.5 MB for more details.
The three following Figures are from the Guidebook.

Figure 1. Simplified geologic map of Proterozoic age provinces for North America and Proterozoic rocks exposed in the western U.S., (modified from Holland et al., 2020; Daniel et al., 2022a). Dashed black lines indicate the approximate area of the Pinware–Baraboo–Picuris (PBP) Orogen. Abbreviations: Pic–Picuris Mountains; SR–Salt River Canyon.
Figure 1. Simplified geologic map of Proterozoic age provinces for North America and Proterozoic rocks exposed in the western U.S., (modified from Holland et al., 2020; Daniel et al., 2022a). Dashed black lines indicate the approximate area of the Pinware–Baraboo–Picuris (PBP) Orogen. Abbreviations: Pic–Picuris Mountains; SR–Salt River Canyon.
Figure 2. Simplified map of the southwestern United States showing Proterozoic crustal blocks. Modified after Jones et al. (2010; cf. Condie, 1986; Bennett and DePaolo, 1987; Karlstrom and Bowring. 1988; Wooden et al., 1988; Wooden and DeWitt, 1991). Colorado Mineral Belt indicated with dashed line. After Mahatma (2019).
Figure 2. Simplified map of the southwestern United States showing Proterozoic crustal blocks. Modified after Jones et al. (2010; cf. Condie, 1986; Bennett and DePaolo, 1987; Karlstrom and Bowring. 1988; Wooden et al., 1988; Wooden and DeWitt, 1991). Colorado Mineral Belt indicated with dashed line. After Mahatma (2019).
Figure 3. Geologic map of the Idaho Springs-Ralston shear zone (IRSZ) area from Lytle (2016), after Gable (2000; cf. Sims, 1964; Sims and Gable, 1964; Wells, 1967; Wrucke and Wilson, 1967; Sheridan et al., 1972; Bryant et al., 1973; Sheridan and Marsh, 1976; Taylor, 1976; and Young, 1991). Automated Mineralogy (AM) samples and map areas as described in detail by Lytle (2016) indicated.
Figure 3. Geologic map of the Idaho Springs-Ralston shear zone (IRSZ) area from Lytle (2016), after Gable (2000; cf. Sims, 1964; Sims and Gable, 1964; Wells, 1967; Wrucke and Wilson, 1967; Sheridan et al., 1972; Bryant et al., 1973; Sheridan and Marsh, 1976; Taylor, 1976; and Young, 1991). Automated Mineralogy (AM) samples and map areas as described in detail by Lytle (2016) indicated.

Verified by MonsterInsights