World Library  
Flag as Inappropriate
Email this Article

Sierra Nevada Batholith

Article Id: WHEBN0006736677
Reproduction Date:

Title: Sierra Nevada Batholith  
Author: World Heritage Encyclopedia
Language: English
Subject: Batholith, Sierran Arc, Geologic timeline of Western North America, Batholiths, Nevadan orogeny
Collection: Batholiths, Geology of California, Sierra Nevada (U.S.)
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Sierra Nevada Batholith

Half Dome, Yosemite, a classic granite dome of the Sierra Nevada Batholith

The Sierra Nevada Batholith is a large batholith which forms the core of the Sierra Nevada mountain range in California, USA, exposed at the surface as granite.

The batholith is composed of many individual masses of rock called plutons, which formed deep underground during separate episodes of magma intrusion, millions of years before the Sierra itself first began to rise. The extremely hot, more buoyant plutons, also called plutonic diapirs, intruded through denser, native country rock and sediments, never reaching the surface. At the same time, some magma managed to reach the surface as volcanic lava flows, but most of it cooled and hardened below the surface and remained buried for millions of years.

The batholith – the combined mass of subsurface plutons – became exposed as tectonic forces initiated the formation of the Basin and Range geologic province, including the Sierra Nevada. As the mountains rose, the forces of erosion eventually wore down the material which had covered the batholith for millions of years. The exposed portions of the batholith became the familiar granite peaks of the High Sierra, including for example, Mount Whitney, Half Dome and El Capitan. However, most of the batholith remains below the surface.

Origins

Research thus far indicates that the Sierra batholith was formed from heating as the Farallon Plate subducted below the North American Plate. The episodic nature of the formation of the plutons is not yet well-explained. It may involve the effects of the emplacement of various terranes along the margin of the continent. Termination of the formation process occurred as the Farallon Plate was fully subducted along the Pacific coastline west of the Sierra.

See also

External links


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.