Propylitization of Tertiary Volcanic Rocks Near Ebbetts Pass, Alpine County, California (Classic Reprint) - Hardcover

Howard G. Wilshire

Hardcover

ISBN 10: 0266827837 ISBN 13: 9780266827832

Publisher: Forgotten Books, 2018

Synopsis

Propylitization near Ebbetts Pass: a clear look at how volcanic rocks change

This concise study maps and analyzes how early Tertiary rocks in Alpine County, California were altered by propylitization. It explains what propylitization looks like in the field and what minerals show the alteration, with a practical view of the processes involved.

The report describes two zones of propylitic rocks near Ebbetts Pass, outlining the geology, field methods, and the conditions that led to alteration. It also covers how groundwater, heat, and intrusive activity may have contributed to the changes, and it compares different rock types and alteration patterns across the region. The work is grounded in field mapping, petrography, and chemical analyses, with references to earlier studies for context.

This edition clarifies definitions, discussion of mineral replacements, and the scope of propylitization in volcanic terrains that have not been heavily deformed. It also explains how the alteration is identified in the breccias and flows and what this means for interpreting the region’s geological history.

• How propylitized rocks look in the field, including color and texture changes
• Which secondary minerals commonly replace primary minerals during alteration
• How rock type and local conditions influence the pattern of alteration
• The role of groundwater and heat in driving the propylitization process

Ideal for readers of regional geology, field geologists, and students interested in mineral alteration and volcanic rock history.

Edition details

• Publisher: Forgotten Books
• Publication date: 2018
• Language: English
• ISBN 10: 0266827837
• ISBN 13: 9780266827832
• Binding: Hardcover
• Number of pages: 43