A breccia pipe, also referred to as a chimney, is a mass of breccia (rock composed of broken fragments of minerals or rock cemented together by a fine-grained matrix), often in an irregular and cylindrical shape.[1]
Breccia is typically silicified and consists of many smaller irregular rock fragments.Breccia pipe cutting Eday Sandstone, Ophir Bay, Orkney
When exposed at the surface, a breccia pipe may appear as an iron-stained knob, from several feet to several hundred feet in diameter. Breccia pipes may or may not be silicified. They usually consist of fragments of the host rock (the rock layer they are contained in) cemented together by silica. They can also be cemented by finely ground host rock called rock flour. These formations are often hosts for ore deposition especially in copper and uranium mining districts.[2] They are sensitive to oxidation, and due to their porous nature, may be oxidized to depths far below the ground surface. Breccia pipes that have never reached the Earth's surface are referred to as "blind".[3]
Originedit
Although the origin of breccia pipes is disputed, the most commonly accepted theory is that they formed at intersections of fractures. In these areas, hydrothermal solutions forced their way to the surface. However, there are some breccia pipes that are a result of limestone collapse by acidic water or other soluble rock types.[2][3][4]
Hydrothermal circulation – Circulation of water driven by heat exchangePages displaying short descriptions of redirect targets
Vein (geology) – Sheetlike body of crystallized minerals within a rock
Referencesedit
^. New England Meteoritical Services. Archived from the original on December 25, 2001. Retrieved August 10, 2019.
^ abDescriptive Model of Solution Collapse- Breccia Pipe Uranium Deposits
^ abcHeylmun, Edgar B. "Breccia Pipes". Retrieved 2009-03-07.
^Mitcham, T. W. (1974). "Origin of breccia pipes". American Journal of Science. 69 (3): 412–413. Bibcode:1974EcGeo..69..412M. doi:10.2113/gsecongeo.69.3.412.
^. Archived from the original on 2007-06-29. Retrieved 2009-03-07.
October 29, 2023
breccia, pipe, breccia, pipe, also, referred, chimney, mass, breccia, rock, composed, broken, fragments, minerals, rock, cemented, together, fine, grained, matrix, often, irregular, cylindrical, shape, breccia, typically, silicified, consists, many, smaller, i. A breccia pipe also referred to as a chimney is a mass of breccia rock composed of broken fragments of minerals or rock cemented together by a fine grained matrix often in an irregular and cylindrical shape 1 Breccia is typically silicified and consists of many smaller irregular rock fragments Breccia pipe cutting Eday Sandstone Ophir Bay Orkney Contents 1 Characteristics 1 1 Origin 1 2 Occurrence 2 See also 3 ReferencesCharacteristics editWhen exposed at the surface a breccia pipe may appear as an iron stained knob from several feet to several hundred feet in diameter Breccia pipes may or may not be silicified They usually consist of fragments of the host rock the rock layer they are contained in cemented together by silica They can also be cemented by finely ground host rock called rock flour These formations are often hosts for ore deposition especially in copper and uranium mining districts 2 They are sensitive to oxidation and due to their porous nature may be oxidized to depths far below the ground surface Breccia pipes that have never reached the Earth s surface are referred to as blind 3 Origin edit Although the origin of breccia pipes is disputed the most commonly accepted theory is that they formed at intersections of fractures In these areas hydrothermal solutions forced their way to the surface However there are some breccia pipes that are a result of limestone collapse by acidic water or other soluble rock types 2 3 4 Occurrence edit Areas that contains many examples of breccia pipes include Copper Creek Arizona which contains approximately 500 mineralized breccia pipes 5 and the gold mining area of Cripple Creek Colorado which contains breccia pipe ore deposits associated with a volcanic diatreme 3 See also editHydrothermal circulation Circulation of water driven by heat exchangePages displaying short descriptions of redirect targets Vein geology Sheetlike body of crystallized minerals within a rockReferences edit Glossary of Meteoritical Terms New England Meteoritical Services Archived from the original on December 25 2001 Retrieved August 10 2019 a b Descriptive Model of Solution Collapse Breccia Pipe Uranium Deposits a b c Heylmun Edgar B Breccia Pipes Retrieved 2009 03 07 Mitcham T W 1974 Origin of breccia pipes American Journal of Science 69 3 412 413 Bibcode 1974EcGeo 69 412M doi 10 2113 gsecongeo 69 3 412 Geology And Geochemistry of the Mammoth Breccia Pipe Copper Creek Mining District Southeastern Arizona Archived from the original on 2007 06 29 Retrieved 2009 03 07 Retrieved from https en wikipedia org w index php title Breccia pipe amp oldid 1181756191, wikipedia, wiki, book, books, library,
