Migmatite (Precambrian; near Morrison, Colorado, USA) 1

            Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change.  This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event).  Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism.  Many metamorphic rocks have a foliated texture, but some are crystalline or glassy.

Migmatite forms by very high-grade metamorphism of gneiss, accompanied by partial melting.  Migmatite is a half-metamorphic, half-igneous rock with a half-gneiss, half-granite appearance.  It has both foliated and crystalline textures.  The granite portions of migmatite (= reddish speckled areas in the photo) formed by cooling of melt.

This specimen is out-of-place, but it may be from Colorado's Proterozoic-aged Idaho Springs Formation.  Injection gneisses, which also occur in the Precambrian of Colorado, are similar in appearance to migmatites.

Locality: loose rock on the slopes of the Dakota Hogback, near Arthur Lakes' "Quarry 10", next to the town of Morrison, north-central Coloado, USA

Some rights reserved

Taken on: November 3, 2010

Tags:

migmatite

Morrison

Dakota

Hogback

Precambrian « less

Sets appears in: • Migmatite

Stats: 315 views

go back

close tools panel

Badge creator

Use Flickriver Badge Creator to create a badge linking to your photos, your group or any other Flickriver view.

You can place your badge on your Flickr profile, Blog or Website.

Add to your iGoogle or Netvibes page

Flickriver widget for iGoogle or Netvibes can display almost any Flickriver view - most interesting today, by user, by group, by tag etc. Once added to your personalized homepage, just edit widget settings to select your desired view.

Clickr on one of the buttons below to install:

Embed on your Web site

To embed this view, Copy and Paste the following HTML code:

Black background (preview):

White background (preview):

Firefox and Chrome addons

Adds a 'Flickriver' button to your browser. While viewing any Flickr photos page, click on this button to open the same view on Flickriver.

Install in Firefox
Install in Chrome

Search plugin

Add 'Search on Flickriver' to your browser's search box. Works with Firefox and Internet Explorer. Install search plugin

"View on Flickriver" Greasemonkey script

A Greasemonkey script that adds Flickriver links to various Flickr photo pages - user photos, favorites, pools etc, allowing to quickly open the corresponding Flickriver view.

Also, allows quickly viewing any Flickr photo on black background in large size.

Install "View on Flickriver" script

Bookmarklet

While viewing any Flickr photos page, click on the bookmarklet to open the same view on Flickriver.

To install: drag and drop the following link to your Bookmarks toolbar.
IE users - add the link to your Favorites under the Links folder