Intersertal Ferrothoeleiite

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The intersertal ferrotholeiite samples are highly fractionated and were most likely emplaced before the gabbro of the formation. They have textures associated with rapidly frozen or highly viscous melts. KBR-7 through KBR-10 are also intersertal ferrotholeiites. Intersertal is a texture marked by the occurrence of interstitial glass between laths of feldspar, usually in basalts. It has an aphanitic porphyritic texture and is holocrystalline. It has a consistent dark gray color and contains fine veins of quartz <1mm wide. There are medium grained subhedral plagioclase phenocrysts (2 mm- 5 mm). There is a calcic residue on a heavily oxidized weathered surface. There is a subophitic micro-texture. Radiating pyroxenes are clearly visible in plain polarized light.
Thin sections are shown in plain polarized light and cross polarized light at 40x magnification.
The rock is comprised of 65% plagioclase, 30% pyroxenes (mainly enstatite), and 5% opaques.


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Purchased from Western Minerals, Inc.

Number of Thin Sections