Chapter 12 - Layered Mafic Intrusions - Faculty web pages
Chapter 12 - Layered Mafic Intrusions - Faculty web pages
Chapter 12 - Layered Mafic Intrusions - Faculty web pages
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Basal Series<br />
Stratigraphy<br />
a thin (50-150 m) layer of norites and gabbros<br />
Ultramafic Series base = first appearance of<br />
copious olivine cumulates (phase layering)<br />
Lower Peridotite Zone<br />
20 cycles (20-150 m thick) of macrorhythmic<br />
layering with a distinctive sequence of lithologies<br />
The series begins with dunite (plus chromite),<br />
followed by harzburgite and then orthopyroxenite<br />
Upper Orthopyroxenite Zone<br />
is a single, thick (up to 1070 m) layer of cumulate<br />
orthopyroxenite
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