The petrology and significance of a stratiform mafic segregation pegmatite in a Karoo-aged dolerite sheet

Mitchell, Andrew A; Naicker, S B; Marsh, Julian S; Dunlevey, J N

Title: The petrology and significance of a stratiform mafic segregation pegmatite in a Karoo-aged dolerite sheet
Creator: Mitchell, Andrew A
Creator: Naicker, S B
Creator: Marsh, Julian S
Creator: Dunlevey, J N
Date Issued: 1997
Date: 1997
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/149496
Identifier: vital:38858
Identifier: https://hdl.handle.net/10520/EJC-9293fd659
Description: A sub-horizontal stratiform mafic segregation pegmatite, of the order of 30 cm thick, occurs within 25 m of the top contact of a Karoo-aged dolerite sheet at Pietermaritzburg, South Africa. The host rock is an orthopyroxene-rich dolerite containing 5 - 8% interstitial granophyre. The pegmatite is similar to the host dolerite in many respects, except that the granophyre content is higher, and acicular augite is the only pyroxene. At its upper contact, a laterally continuous sub-horizontal joint forms a sharp boundary to the pegmatite, whilst the lower contact is gradational over a few millimetres. Low MgO and chalcophiles, and elevated incompatible element contents, are the main geochemical attributes of the pegmatite.
Format: 10 pages
Format: pdf
Language: English
Relation: South African Journal of Geology
Relation: Mitchell, A.A., Naicker, S.B., Marsh, J.S. and Dunlevey, J.N., 1997. The petrology and significance of a stratiform mafic segregation pegmatite in a Karoo-aged dolerite sheet. South African Journal of Geology, 100(3), pp.251-260.
Relation: South African Journal of Geology volume 100 number 3 251 260 September 1997 1012-0750
Rights: Author
Rights: Use of this resource is governed by the terms and conditions of the Sabinet Terms and Conditions Statement (https://www.sabinet.co.za/terms-conditions)

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