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July 2, 2026Geological Society of America Bulletin

Timing of Jurassic orogeny in the Klamath Mountains province: A view from the middle crust

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Authors

CBC.G. BarnesKGK. GatesSLS. Leib

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Overview

Randomized trial identifies distinct Jurassic orogenic events influencing crustal evolution in North America, suggesting complex thermal processes.

Key Points

  • This research investigates the timing and nature of Jurassic orogenesis and its impacts on the Klamath Mountains' crustal evolution.
  • New U-Pb dating of zircon from pinning plutons to determine ages of terrane amalgamation.
  • Single-crystal U-Pb dating and Sm-Nd techniques to establish metamorphic histories.
  • Analysis of various geochronological techniques including 40Ar/39Ar dating for cooling ages.
  • Middle Jurassic terrane amalgamation (Siskiyou orogeny) ended by ca. 172 Ma.
  • Peak metamorphism occurred by ca. 157 Ma, linked to the Nevadan orogeny.
  • Peak plutonism reached around 158 Ma, suggesting magma transport influenced metamorphic processes.

Cite This Study

Barnes et al. (2026) studied this question.

synapsesocial.com/papers/6a45fffc9ed13430313102fahttps://doi.org/10.1130/b39050.1
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