tag:blogger.com,1999:blog-5211670216140060946.post7339745027168231370..comments2024-03-17T18:37:36.377-07:00Comments on Geotripper: Taking Granite for Granted? Looking at Gneiss Rocks in Joshua TreeGarry Hayeshttp://www.blogger.com/profile/00531226195147986457noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-5211670216140060946.post-18326680284238478472011-05-25T02:57:50.681-07:002011-05-25T02:57:50.681-07:00These rocks once may have been sands on a beach so...<i>These rocks once may have been sands on a beach some 2 billion years ago, or muds on a sea floor.</i><br /><br />Imagining a landscape in the distant past is what me so interested in Geology.Spingnoreply@blogger.comtag:blogger.com,1999:blog-5211670216140060946.post-35236480038949681752011-05-23T12:36:29.856-07:002011-05-23T12:36:29.856-07:00After time spent in the Sierra looking at white/bl...After time spent in the Sierra looking at white/black granite searching for lovely pink potassium feldspar phenocrysts, now you show me a pic of white/black granite as a xenolith. I want to say to my white/black background rock, "ah-ha, you can be caught up in something bigger than yourself, too." Silly, I know...Karennoreply@blogger.comtag:blogger.com,1999:blog-5211670216140060946.post-84880883858935709242011-05-22T20:24:55.993-07:002011-05-22T20:24:55.993-07:00I took that particular pic on the same trip, and g...I took that particular pic on the same trip, and guess I forgot what Dee said about them. I was thinking we were closer to the top of the magma chamber, near the intrusive breccia.Garry Hayeshttps://www.blogger.com/profile/00531226195147986457noreply@blogger.comtag:blogger.com,1999:blog-5211670216140060946.post-43512970774735682172011-05-22T20:16:33.756-07:002011-05-22T20:16:33.756-07:00Actually Garry, the bottom picture shows mafic enc...Actually Garry, the bottom picture shows mafic enclaves within the granitic rock. The idea is that a mafic magma intruded into the still liquid felsic magma, but didn't mix. (I have the same picture, taken during the NAGT trip, March, '07).Randy A.noreply@blogger.com