Quartz gabbro

Quartz gabbro

Quartz gabbro is a type of rock that contains a small amount of interstitial quartz, which is formed from the last liquid to crystallize from a magma with slightly higher silica content than normal. An example of quartz gabbro is the Carrock Fell rock in Cumberland. It is found in the Kathleen Valley Layered Intrusive Complex along with anorthosite, porphyritic gabbro, and gabbro.From: A Geology for Engineers [2017], Stratigraphy of the Agnew-Wiluna Greenstone Belt: review, synopsis and implications for the late Mesoarchean to Neoarchean geological evolution of the Yilgarn Craton [2022]

Igneous Rocks

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Published in F.G.H. Blyth, M. H. de Freitas, A Geology for Engineers, 2017

F.G.H. Blyth, M. H. de Freitas

Troctolite has olivine and plagioclase (no augite). Quartz-gabbro contains a little interstitial quartz, derived from the last liquid to crystallize from a magma with slightly higher silica content than normal; e.g. the Carrock Fell rock, Cumberland.

Stratigraphy of the Agnew-Wiluna Greenstone Belt: review, synopsis and implications for the late Mesoarchean to Neoarchean geological evolution of the Yilgarn Craton

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Published in Australian Journal of Earth Sciences, 2022

Q. Masurel, N. Thébaud, J. Sapkota, M. C. De Paoli, M. Drummond, R. H. Smithies

Crustal units dated between ca 2740 and 2720 Ma have been locally identified in the AWB, and include the 2736 ± 3 Ma Kathleen Valley Layered Intrusive Complex. This layered intrusive complex occurs in the hanging wall of the Ida Shear Zone, which represents the historical boundary between the Youanmi and Kalgoorlie terranes in the AWB (Figure 6). The Kathleen Valley Layered Intrusive Complex consists of anorthosite, porphyritic gabbro, gabbro and quartz-gabbro (Eisenlohr, 1989; Naldrett & Turner, 1977). The Kathleen Valley Layered Intrusive Complex intruded a >1000 m-thick sequence of pillow-textured to massive, tholeiitic, locally feldspar-porphyritic to megacrystic basalts, collectively referred to as the Mt Goode Basalt (Figure 6). Igneous layering is consistently overturned in all stratigraphic units, with younging directions towards the southeast or east-southeast (Duuring et al., 2012).

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Igneous Rocks

Stratigraphy of the Agnew-Wiluna Greenstone Belt: review, synopsis and implications for the late Mesoarchean to Neoarchean geological evolution of the Yilgarn Craton