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Strategies & Market Trends : Ride the Tiger with CD
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To: ogi who wrote (161371)5/29/2009 11:39:02 AM
From: E. Charters  Read Replies (2) of 313392
 
Sometimes anastomosing shears or cleavage are mistaken for sedimentary breccia, and the terminology is also confused with volcanic agglomerates.



This is as rough approximation of anastomosing cleavage which is sometimes referred to as breccia.

There are heterolithic sedimentary breccias, which are not all that interesting in terms of mineralization. Volcanic breccia zones, which are fairly interesting loci of hydrothermal fluids are actually localized autoclastic zones showing brittle reaction to transpressional forces.



This is an autoclastic breccia, of more interest. In this case marble. The texture is the key, not the host. But the welding of the fragments could be hydrothermal mineralization in some cases.



This is another example of autoclastic breccia which has economic significance, being copper-replaced in the fractures.

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