Tholeiitic Gabbro

Title

Tholeiitic Gabbro

Alternative Title

Gabbro

Identifier

KBR-5

Description

KBR-3 through KBR-6 are a second gabbro mass, distinguished from the first by a repetition of the differentiation cycle. The gabbro is medium grained and holocrystalline with a hypidiomorphic-granular texture. There are gray and black crystals, both ranging from <1mm- 3mm. There is a reddish, rusty looking weathered surface. This rock has an average specific gravity.
Thin sections shown in plain and cross polarized light at 40x magnification.The rock is made up of 80% plagioclase, 20% pyroxene (mainly augite), and ~2% opaques.

Date

No date given.

Contributor

Western Minerals, Inc

Is Part Of

http://www.geosciencecollections.milne-library.org/collections/show/17

Spatial Coverage

Karoo- Birds River, Eastern Cape, South Africa

Temporal Coverage

183-179 Ma (Jurassic)

Accrual Method

Purchased from Western Minerals Inc

Unit

Lesotho Formation

Number of Thin Sections

2

Geolocation