Tholeiitic Gabbro

Title

Tholeiitic Gabbro

Alternative Title

Gabbro

Identifier

KBR-4

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 red 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 65% plagioclase, 25% pyroxene (mainly augite), and 10% 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