By Peter R. Johnson
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Extra info for PROTEROZOIC GEOLOGY OF WESTERN SAUDI ARABIA
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In the vicinity of the Baqarah gneiss dome, between about lat 18°45′N and 19°10′N, the metamorphic grade is higher and the rocks include quartz-biotite schist, actinolitebiotite schist, actinolite-biotite-quartz-feldspar schist, quartzofeldspathic granofels, amphibolite, hornblende schist, and white, gray, and brown marble. Flecks of malachite are present in the quartzofeldspathic rocks and phyllite, in addition to copper minerals in mafic sills at the Wadi Yiba prospect (Kattu and others, 2006), and kyanite, as kyanite-quartz-muscovite and kyanite-quartz-biotite schists, occurs on the flanks of and as roof pendants in the Baqarah gneiss.
Explanatory notes to the map of Proterozoic geology of western Saudi Arabia 21 Ghamr group, ~750 Ma The Ghamr group (gk) (Kemp and others, 1982) consists of low-grade volcanic and sedimentary rocks in the eastern part of the Jiddah terrane. The rocks are unconformable on the Hufayriyah tonalite (760 Ma), and yield an Rb-Sr whole-rock isochron age of 748±22 Ma (Calvez and others, 1983) from a subvolcanic intrusion that is consistent with this relationship. They are treated here as middle Cryogenian.
Most of the rocks are amphibolite grade. Mafic granulite is locally present and other rocks are greenschist. For the purpose of compilation, they are grouped by Johnson (2005b) as a composite map unit (nk). The Dhiran formation (Cole, 1988) consists of andesite and minor dacite. The Nafi formation, Hillit formation, and Dukhnah gneiss comprise chlorite schist, biotite schist, muscovite-garnet schist, quartzofeldspathic schist, amphibolite, rare calcareous beds, biotite gneiss, quartzfeldspar gneiss, and local mafic granulite.