| This was the thesis subject for my graduate work at SDSU. |
|---|
|
WHERE it is:
Approximately within the yellow rectangle |
|
WHAT it is:
A densely intruded, northwest-striking, predominantly silicic regional dike swarm exposed over an approximately 100 km-long segment in the west-central portion of the Cretaceous Peninsular Ranges batholith (PRB). Cross-cutting field relationships and a preliminary U-Pb zircon age of 120±1 Ma establish the swarm as an integral feature in the magmatic evolution of the PRB.
|
 Here's one of the dikes in a roadcut near Ejido San Marcos. Click on the picture below left for a closeup.  
|
|
I gave a poster session to present the on-going research of this dike swarm to the Geological Society of America Cordilleran Section Centennial meeting in Berkeley in June of 1999. In November 2004, I presented the updated version at GSA in Denver.  GSA 2004 Click here for the poster(s) |
|
Photos from a field trip in 1999, source of the image above. |
|
Here's a web version (HTML5/Flash) of my thesis defense 2003. |
|
And here's the final thesis, approved on 30 July 2004. |
|
© 1999-2016, Phil Farquharson, CG-Squared Productions E-mail: dikeswarm AT geology-guy.com (not a "clickable" link) Latest revision: 24 December 2021 (added 'https' links) |
Google Earth .kmz file of
sample locations: 
