Geology 1 - Geology - 3/17/2008 9:11 AM Other Volcanic...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Geology - 3/17/2008 9:11 AM Other Volcanic pipes and necks o Pipes are short conduits that connect a magna chamber to the surface o Volcanic necks(e.g. Ship Rock, New Mexico) are resistant vents left standing after erosion has removed the volcanic cone Intrusive igneous activity o Most magma is emplaced at depth o An underground igneous body is called a pluton o Plutons are classified according to Shape Tabular (sheetlike) Massive Orientation with respect to the host (surrounding) rock Discordant – cuts across existing structures Concordant – Parallel to features such as sedimentary strata o Types of igneous intrusive features Dike – a tabular, discordant pluton Sill – a tabular, concordant pluton E.g. Palisades Sill, NY Resemble buried lava flows May exhibit columnar joints Laccoliths Similar to a sill Lens shaped mass Arches overlying strata upward
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Batholiths Contain precious metals Largest intrusive body
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

Geology 1 - Geology - 3/17/2008 9:11 AM Other Volcanic...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online