Cape O'Brien Member

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Journal Article
Published: 01 June 2017
South African Journal of Geology (2017) 120 (2): 223-230.
... in the Paarl Pluton, as indeed in all members of the Cape Granite Suite. The pegmatite with bavenite is a body of some 6 m 3 with irregular shape. It is essentially a quartz-microcline pegmatite with calcian albite, fluorite, and calcite. Quartz and microcline microperthite are graphically intergrown...
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Journal Article
Journal: Geology
Published: 07 June 2018
Geology (2018) 46 (7): 643-646.
... this has been established qualitatively, modern thermodynamic data sets allow quantification of the thermal consequences for real rocks. Here we calculate the heat consumption of melting reactions, and its effect on the temperature attained during high-grade metamorphism, for two compositional end members...
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Series: European Mineralogical Union Notes in Mineralogy
Published: 01 January 2017
EISBN: 9780903056663
... for the detection of fibres and ABs, then we discuss the possibility of using: (1) populations of animal sentinel system (ASS) as models to assess the environmental exposure to aerodispersed inorganic fibres (asbestos and non-asbestos) and to provide early warning of possible implications for human health (O’Brien...
Journal Article
Published: 01 December 2007
South African Journal of Geology (2007) 110 (4): 631-646.
... magmas sharing a common plumbing system ( Smith, 1983a ), derivation from isotopically distinct source regions ( Beard et al. , 2000 ), as well as mixing of source regions ( Smith et al. , 1994 ; O’Brien and Tyni, 1999 ). The primary aims of this study are to characterise the geochemistry...
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Journal Article
Published: 01 March 2000
Geological Magazine (2000) 137 (2): 137-153.
... terranes) can be explained as supra-subduction zone magmatism above a single northwest-dipping (present co-ordinates) Benioff zone. Ayuso, Barr & Longstaffe (1996) have shown that the Pb isotope signatures in Neoproterozoic igneous rocks in Cape Breton Island represent mixing of two end members...
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Journal Article
Published: 01 March 2016
South African Journal of Geology (2016) 119 (1): 171-186.
... Formation to test its ability to act as a cap rock to the underlying carbon-rich, potentially gas-bearing shales of the Whitehill Formation. Fresh core samples from a borehole drilled through the Lower Ecca Group near Jansenville, in the Eastern Cape, South Africa, were analysed for their mineralogical...
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Journal Article
Journal: AAPG Bulletin
Published: 01 January 1975
AAPG Bulletin (1975) 59 (1): 3-59.
...K. O. Emery; Elazar Uchupi; C. O. Bowin; Joseph Phillips; E. S. W. Simpson Abstract Approximately 17,000 km of continuous gravity, magnetic, and seismic-reflection profiles were recorded to determine the structure of the continental margin from Cape St. Francis to Walvis Ridge, and of the adjacent...
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Journal Article
Journal: Clay Minerals
Published: 01 September 2016
Clay Minerals (2016) 51 (4): 675-689.
...Vincent Trincal; Vincent Trincal; Pierre Lanari Abstract A compilation of Fe 3+ -bearing chlorite analyses is used: (1) to investigate the Al-free di-trioctahedral (AFDT) substitution 2Fe 3+ + □ = 3(Mg,Fe 2+ ) in chlorite; and (2) to estimate the composition of a ferri-sudoite end-member (Si 3 Al...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP460.9
EISBN: 9781786203410
... Fig. 3. Summary of current knowledge of basement rock ages in the circum-Arctic. Sources of information include: Pearya (Arctic Canada), Hadlari et al. (2013) , Malone et al. (2014) ; Chukchi Borderland, Brumley (2014) , O’Brien & Miller (2014) , Brumley et al. (2015...
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Journal Article
Published: 01 June 2014
South African Journal of Geology (2014) 117 (1): 31-44.
... compositions were determined using a JEOL JXA-8100 electron microprobe housed at the University of Cape Town. Analyses were carried out using a 15 kV acceleration voltage, 20 nA probe current and 2 to 3μm spot size. Counting times were 5 seconds for both backgrounds and 10 seconds for peaks on all elements...
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Journal Article
Published: 18 July 2000
Canadian Journal of Earth Sciences (2000) 37 (7): 1039-1052.
... for sedimentary rocks range from −8.4 to +3.6. A granite within the Kingston terrane has ε Nd (438 Ma) = +4.0. Nd isotopic compositions for the Kingston and Caledonia terranes are similar to those of the Mira terrane in Cape Breton Island, the Antigonish Highlands of Nova Scotia, and plutonic rocks of eastern...
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Journal Article
Published: 19 June 2003
Canadian Journal of Earth Sciences (2003) 40 (6): 887-905.
...David P. West, Jr.; Heather M. Beal; Timothy W. Grover Abstract The Casco Bay Group in south-central Maine consists of a sequence of Late Cambrian to Early Ordovician interlayered quartzofeldspathic granofels and pelite (Cape Elizabeth Formation) overlain by Early to Late Ordovician back-arc...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2011
GSA Bulletin (2011) 123 (7-8): 1448-1477.
... disconformably overlie the Franni-aus Member of the Ombaatjie Formation, a coarsening-upward stack of carbonate turbidites and oolite-clast debris-flow breccias interpreted to be a glacioeustatic falling-stand wedge. Within the main Ghaub Formation, carbonate diamictites are interleaved with mesoscale, laminated...
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Journal Article
Published: 07 August 2015
Geological Magazine (2016) 153 (3): 460-486.
... was therefore undertaken. Five samples of the Durban and Mariannhill Formations (Natal Group) and the Msikaba Formation (Cape Supergroup) were obtained. A total of 882 concordant U–Pb ages of detrital zircon populations from these units were determined by means of laser ablation inductively coupled plasma mass...
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Series: GSA Special Papers
Published: 14 June 2019
DOI: 10.1130/2018.2541(12)
EISBN: 9780813795416
... source by the early Carboniferous, metamorphism in the orthogneiss basement observed between ca. 395 and 372 Ma, and the emplacement of the Cape Woods post-tectonic pluton at 390 Ma. The Paleozoic tectonic evolution of the northern margin of Laurentia and the Arctic extension...
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Journal Article
Published: 15 April 2009
Canadian Journal of Earth Sciences (2009) 46 (3): 169-180.
...Peter H. Reynolds; Sandra M. Barr; Chris E. White Abstract We report single-grain ages for detrital muscovite separated from sandstone samples from five localities in southern New Brunswick and southeastern Cape Breton Island, Nova Scotia, and from two quartzite clasts from a quartzite-pebble...
Journal Article
Journal: Palynology
Published: 20 December 2018
Palynology (2018) 42 (0): 162-181.
... (off Cape Blanc) environments. This is the first study that provides detailed inter-site comparison of dinoflagellate cysts in sediment traps and analyzes seasonal, annual, and inter-annual cyst production from different geographic regions. We identified that cyst fluxes of all Spiniferites species...
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Journal Article
Published: 01 July 2002
Journal of Sedimentary Research (2002) 72 (4): 510-523.
...Alexa L. Troedson; James B. Riding Abstract The Cape Melville Formation (CMF), exposed on southeastern King George Island, South Shetland Islands, provides rare evidence of extensive earliest Miocene glaciation in the Antarctic Peninsula region. The formation records the presence of regional marine...
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Journal Article
Journal: GSA Bulletin
Published: 01 September 2008
GSA Bulletin (2008) 120 (9-10): 1305-1325.
... follows the basin-wide synthesis of Embry (1986) , in which basin-margin sandstone tongues (the Cape Butler, Pell Point, and Cape O'Brien members) are reflected in shale-dominated, but coarsening-up units in the basin center. They also identify additional transgressive surfaces (and sequences) within...
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... Dolomite in southern Missouri. He defined a Theodosia Formation (with two members: lower Lutie and upper Blackjack Knob) for strata that underlie the Cotter Dolomite, but he believed that these units are not exposed in Arkansas. The Theodosia Formation has not been widely recognized subsequently...
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