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Exploration of genetic links between breccia pipes and porphyry

Exploration of genetic links between breccia pipes and porphyry 2025

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The document is a master's thesis by Amy B. Eichenlaub that explores the genetic connections between breccia pipes and porphyry copper deposits within the Laramide hydrothermal system at Sombrero Butte, Arizona. It details the geological characteristics, mineralization processes, and alteration patterns of breccia pipes in the region, emphasizing their potential as indicators of underlying porphyry systems. The study employs various analytical methods including field mapping, petrographic analysis, and geochemical assessments to support its findings.

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What is another name for a volcanic pipe?

Conduit - The channelway or passage, which may be pipe-shaped, that brings magma from a reservoir or chamber to the vent at the surface where it is erupted. Lava flow - An outpouring of molten rock from a vent onto Earths surface during an effusive volcanic eruption; also the resulting solidified body of rock.

What is a volcanic pipe filled with breccia?

Breccia pipes are vertical cylindrical bodies of breccia ranging in width from about a metre to about 100 m, and in depth from tens of metres to over a kilometre. They give rise to landforms such as craters, lakes, or hills, and some are planated and hard to see on the ground.

What is a breccia pipe?

Breccia pipes are cylindrical or irregular bodies of brecciated rock that may show cross-cutting or gradational relations to the country rock. They are sometimes associated with igneous bosses or volcanic pipes, or show extensive mineralization. Others have no evidence of associated igneous or hydrothermal activity.

What does volcanic breccia look like?

Volcanic breccias are clastic-textured, extrusive igneous rocks. They generally appear as multicolored masses of jumbled angular grains.

How was porphyry formed?

Porphyry-type deposits are formed above magma chambers where fluids hydrofracture rock at 700350 C and at pressures ranging from supra-lithostatic to supra-hydrostatic.

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What is volcanic breccia known as?

Also known as: igneous breccia, pyroclastic breccia.

What are the deposits in the breccia pipes?

[2] The breccia pipe mineral deposits range from 1000 to 1800 feet deep and have a vertical extent of up to 600 feet. The pipes typically have a 200-to-400-foot (61 to 122 m) diameter. A 1,000-to-1,600-foot-deep (300 to 490 m) shaft is usually required to access the deposits.

What are porphyry copper deposits associated with?

In general, the majority of large porphyry deposits are associated with calc-alkaline intrusions, although some of the largest gold-rich deposits are associated with high-K calc-alkaline magma compositions.

Where would you expect a breccia to be deposited?

Breccia forms where broken, angular fragments of rock or mineral debris accumulate. One of the most common locations for breccia formation is at the base of an outcrop where mechanical weathering debris accumulates. Another is in-stream deposits a short distance from the outcrop or on an alluvial fan.

What sediments are in breccia?

Breccia is commonly used for clastic sedimentary rocks composed of large sharp-angled fragments embedded in a fine-grained matrix of smaller particles or mineral cement. The breccia generated by folding, faulting, magmatic intrusions, and similar forces is called tectonic breccia.

Exploration of genetic links between breccia pipes and porphyry 2025

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