kezia
Uploaded by
11 SLIDES
253 VUES
110LIKES

Exploring the Basin-Range Transition: A Field Guide by Dan Dziekan and Richard Fletcher

DESCRIPTION

Join Dan Dziekan and Richard Fletcher for a comprehensive one-day field guide exploring the Basin-Range transition. This guided tour includes significant stops at Lava Butte, Paulina Peak, Hole in the Ground, Green Mountain Lookout, Crack in the Ground, Winter Ridge, and the Ana River Fault at Summer Lake. Learn about the geologic history of the Newberry Caldera, its eruptions, and the various volcanic and tectonic features throughout the area. Perfect for geology enthusiasts and adventurers alike!

1 / 11

Télécharger la présentation

Exploring the Basin-Range Transition: A Field Guide by Dan Dziekan and Richard Fletcher

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Basin Range Transition Presented by Dan Dziekan and Richard Fletcher

  2. 1 Day Field Guide Overview 2 Stop One: Lava Butte Stop Two: Paulina Peak Stop Three: Hole in the Ground Stop Four: Green Mountain Lookout Stop Five: Crack in the Ground Stop Six: Winter Ridge Stop Seven: Ana River Fault at Summer Lake 3 4 5 7 6

  3. Brief Newberry Overview • Named after John Newberry • Caldera reaches 2,400 meters • Formed 80,000 years ago • Most recent eruption 1,300 years ago • Formed from Rhyolite to Basalt flows

  4. Lava Butte • Northern most vent along Holocene fissure • Extends 30 km south to Newberry • Erupted 7,000 years ago • Began as a 2.4 km long fissure • Concentrated at the site of Lava Butte • 150 m high cinder cone • Eruptive products cover 23 km squared • Flows erupted from various vents

  5. Paulina Peak • Located on southern side of Newberry Caldera • Provides Great view of many flows

  6. Hole in the Ground • Maar formed when Newberry Lavas entered water saturated sediment of Fort Rock basin 50-100 thousand years ago. • Premature eruption

  7. Green Mountain Lookout • Basalt Shield • Fed lava flow at Crack in the Ground • Around 740 thousand years ago • East lava field erupted from Lava Mountain Shield Volcano • Marked by a 1.6km long series of craters

  8. Crack in the Ground • Northwest striking crack • Coincides with a Quaternary normal fault trace • Crack penetrates more than one lava flow • Suggests tectonic rather than volcanic • About 10 meters of vertical displacement

  9. Winter Ridge • Stop located in the foot wall of Winter Ridge fault system • Viewpoint allows for multiple fault to be observed • Defines first extensional escarpment

  10. Summer Lake • Pleistocene pluvial lake called Lake Chewaucan • Occupied basin formed between Winter Ridge and Abert Rim • Ana River and Winter Ridge faults cut shorelines

More Related