Al/Cr ratios of coexisting pyroxenes and spinellids in some ultramafic rocks
- Authors: Eales, Hugh V , Marsh, Julian S
- Date: 1983
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/133534 , vital:36987 , https://doi.org/10.1016/0009-2541(83)90045-1
- Description: Al/Cr atomic ratios of coexisting spinellids and ortho- and clinopyroxenes show a pattern of sympathetic variation that persists through ultramafic rocks of layered mafic complexes of upper-crustal type, Alpine complexes, and the nodules found in kimberlites and alkaline basalts. Simple expressions are empirically derived to link (Al/Cr) orthopyroxene and (Al/Cr)spinel ratios in putatively equilibrated rocks. Equivalence of spinel compositions in shallow layered complexes and kimberlite nodules of deep-seated origin negates direct crystallochemical control of Al/Cr ratios of spinels by pressure.
- Full Text: false
- Date Issued: 1983
Statistical base for planning service centres in Transkei's north-west region
- Authors: Osmond, Lange, Vandeverre, Haarhoff, Goldswain and Burger
- Date: 1983
- Subjects: f-sa , 0-20 km 30.5595° S, 22.9375° E , Transkei (South Africa) Maps , Regional planning -- South Africa -- Transkei Maps , Regional development -- South Africa -- Transkei Maps , Population density -- South Africa -- Transkei Maps , South Africa History 1909-1961 Maps
- Language: English
- Type: maps , digital maps , cartographic
- Identifier: http://hdl.handle.net/10962/121750 , vital:35142 , Cory Library for Humanities Research, Rhodes University Library, Grahamstown, South Africa , MP1881
- Description: Maps to accompany "Statistical base for planning service centres in Transkei's north-west region" by Osmond Lange Vandeverre Haarhoff Goldswain and Burger, architects and regional planners. For the Department of Commerce, Industry and Tourism, Republic of Transkei. Map 1 north west region, Map 2 north east region.
- Full Text: false
- Date Issued: 1983