| THISTLEWOOD, L., LEAT, P. T., MILLAR, I. L., STOREY, B. C., VAUGHAN, A. P. M. (1997) Basement geology and PalaeozoicâMesozoic mafic dykes from the
Cape Meredith Complex, Falkland Islands: a record of repeated
intracontinental extension. Geological Magazine, 134 (3) 355-367 doi:10.1017/s0016756897007085 | Journal (article/letter/editorial) | PalaeozoicâMesozoic mafic dykes from the Cape Meredith Complex, Falkland Islands: a record of repeated intracontinental...and granitoids of the Cape Meredith Complex on the southern tip of West Falkland, provide an important...lamprophyres and Jurassic Ferrartype magmas in the Cape Meredith Complex demonstrate for the first time that the...Introduction The Cape Meredith Complex on the southern tip of West Falkland, Falkland Islands, is important...1; Beckinsale et al. 1976; Tarney, 1976), the complex is the only observed continental crystalline basement | | | Journal (article/letter/editorial) | evolution of the Mesoproterozoic Cape Meredith Complex, West Falkland ROBERT J. THOMAS*, JOACHIM JACOBSâ ...metamorphic and igneous rocks of the Cape Meredith Complex, West Falkland. The data indicate that the oldest...rocks, the ~1.1 Ga supracrustal gneisses of the Big Cape Formation, which form three petrographic and geochemical...groups (mafic amphibolite, quartzâplagioclaseâbiotiteâhornblende intermediate gneiss and acid gneiss)...extruded in an island-arc at around 1120 Ma. The Big Cape Formation was intruded by granitoids during and | | | Journal (article/letter/editorial) | Pre-lamprophyre mafic dykes of the Cape Meredith Complex, West Falkland R. J. THOMAS*, F. HENJES-KUNSTâ ...which intrude the Mesoproterozoic Cape Meredith Complex, West Falkland. The dykes, which have been previously...suite of lamprophyre sheets. New KâAr data from biotite separates from two lamprophyres suggest a miminum...which intrude the Mesoproterozoic Cape Meredith Complex on West Falkland. Two of us (Thomas and Jacobs)...geological mapping and sampling program on the Cape Meredith Complex in late 1994 (Thomas, Jacobs & Weber, 1995 | | | Journal (article/letter/editorial) | lithologies of the NamaquaâNatal Belt are exposed in the west and east of South Africa but the central section...supercontinent of Rodinia. Zircons from granite and biotite gneiss in two deep boreholes which penetrated the...Kaapvaal Craton. The Belt can also be followed north-west to the Awasib Mountain Terrane of southern Namibia...whilst continental reconstructions place the Falkland Islands, Agulhas Plateau and the Maudheim Province...have been obtained from basement exposures in the west (Namaqua sector: Kheis, Gordonia and Bushmanland | | | Journal (article/letter/editorial) | Paleogeography of Late Paleozoic Diamictite, Falkland Islands pebbly mudstone, graded graywacke, and shale...sandstone of the western facies. Transport from west to east is indicated by small-scale sedimentary...during Late Paleozoic time. Abstract: In the Falkland Islands, diamictite of Carboniferous to Early Permian...those derived locally from both the Cape Meredith basement complex and the Devonian sequence as well as...well-sorted sandstone and minor conglomerate in the west to extensive, bedded intercalations of CONTENTS | | Mendonidis, P., Thomas, R.J., Grantham, G.H., Armstrong, R.A. (2015) Geochronology of emplacement and charnockite formation of the Margate Granite Suite, Natal Metamorphic Province, South Africa: Implications for Natal-Maud belt correlations. Precambrian Research, 265. 189-202 doi:10.1016/j.precamres.2015.02.013 | Journal (article/letter/editorial) | garnet-free leucogranite, charnockite and garnet-biotite augen gneiss. In this study we present new U-Pb...age of 1169 ďą 14 Ma, obtained from the garnet-biotite augen gneiss phase, is statistically similar to...49 2 the Margate Terrane is longer and more complex than previously thought. The original granite protolith...Natal belt. In this scenario, the Cape Merdith Complex, West Falkland, which shows no zircon evidence of...(Jacobs et al, 1993; Grantham et al, 1997), via the Falkland microplate (e.g. Thomas et al., us 1997) and | | Riley, T.R., Flowerdew, M.J., Pankhurst, R.J., Millar, I.L., Whitehouse, M.J. (2020) U-Pb zircon geochronology from Haag Nunataks, Coats Land and Shackleton Range (Antarctica): Constraining the extent of juvenile Late Mesoproterozoic arc terranes. Precambrian Research, 340. 105646 doi:10.1016/j.precamres.2020.105646 | Journal (article/letter/editorial) | Cross, Madingley Road, Cambridge, CB3 0ET, UK. West Building, Madingley Rise, Madingley Road, Cambridge...from the Mesoproterozoic Haag Nunataks gneiss complex of West Antarctica where the dominant granodiorite...potential correlation with the Haag Nunataks gneiss complex. The magmatic precursors of the Haag Nunataks orthogneisses...quartzo-feldspathic gneisses of Haag Nunataks in West Antarctica (Fig. 1a (Millar and Pankhurst, 1987;...Ellsworth-Whitmore Mountains (EWM) micro-continental block of West Antarctica, which was displaced during 4 Gondwana | | | Journal (article/letter/editorial) | ARCs at 2.078 Ga and by those of the Bushveld Complex and elsewhere between 2.061 and 2.054 Ga, and impacted...In contrast, the Natal Belt, including the Falkland Islands, acted from 1.25 Ga to 1.0 Ga, with TDM 2...was the intrusion of 520 Ma lamprophyre at Cape Meredith. A belt of âź1.1 Ga magmaticâmetamorphic rocks...the Grunehogna Province, the âź1.1 Ga NatalâFalkland Islands extend through the Maud Belt of DML through... by the 0.52 Ga alkaline rocks at Cape Meredith, Falkland Islands, and by the 3.0 Ga intrusions of the | | Jacobs, J., Bauer, W., Spaeth, G., Thomas, R. J., Weber, K. (1996) Lithology and structure of the Grenville-aged (~1.1âGa) basement of Heimefrontfjella (East Antarctica) Geologische Rundschau, 85 (4) 800-821 doi:10.1007/s005310050113 | Journal (article/letter/editorial) | were juxtaposed and pervasively deformed during a complex J. Jacobs (Y) Universität Bremen, FB5-Geowissenschaften...Canada through Texas into East Antarctica, the Falkland Islands and southern Africa (the NamaquaNatal belt;...nunataks, in western Dronning Maud Land, the Falkland Islands and in southern Africa. Arrows indicate main...Reconstruction of east Antarctica, southern Africa and the Falkland microplate after Martin and Hartnady (1986) and...southeast by the Grenville-aged belt exposed (from west to east) in Mannefallknausane, Heimefrontfjella | | | Journal (article/letter/editorial) | Dronning Maud Land (east Antarctica), and the Cape Meredith Complex in the Falklands, which on reconstruction...as the Beattie Magnetic Anomaly and the Southern Cape Conductive Belt (De Beer and Meyer, 1984) (Figure...in the Margate terrane is generally oriented east-west to northeast-southwest striking with a gentle to...coarse-grained, foliated, K-feldspar megacrystic, biotite garnet granite that crops out between the Mpenjati...perthitic K-feldspar, plagioclase (An24-30), quartz, biotite, garnet, opaques, apatite and zircon. Sillimanite | | Jacobs, J., Bauer, W., Spaeth, G., Thomas, R. J., Weber, K. (1996) Litholog and structure of the Grenville-aged (â1.1 Ga) basement of heimefrontfjella (East Antarctica) Geologische Rundschau, 85 (4) 800-821 doi:10.1007/bf02440112 | Journal (article/letter/editorial) | were juxtaposed and pervasively deformed during a complex Abstract J. Jacobs (Y:~) Universit~t Bremen, ...Canada through Texas into East Antarctica, the Falkland Islands and southern Africa (the NamaquaNatal belt;...southeast by the Grenville-aged belt exposed (from west to east) in Mannefallknausane, Heimefrontfjella...Haag nunataks, in western Dronning Maud Land, the Falkland the Mesoproterozoic belt and the Archaean crust...Reconstruction of east Antarctica, southern Africa and the Falkland microplate after Martin and Hartnady (1986) and | | | Journal (article/letter/editorial) | Sikombe Granite from northeastern Transkei (Eastern Cape Province). The outcrops form the most southerly...coastal outcrop in the former Transkei (now Eastern Cape Province), some 15km south of the Mtamvuna River...similarities with the âG2â augen gneisses of the Cape Meredith Complex, which may have lain close to southern KwaZulu-Natal...(pink-weathering), strongly foliated feldspar-megacrystic biotite augen gneiss, with granite (sensu stricto) modal...graphite. Discoidal xenoliths of older country-rock biotite-hornblende gneiss and schist are common. The granite | | | Report (chapter) | have been collated from Antarctica and the Falkland Islands (adjacent in Gondwana) in order to identify...Early Palaeozoic areas of West Antarctica, Victoria Land and the Falkland Islands that formed the Gondwana...basalts that occur characteristically on ocean islands (ocean island basalt - OIB) have less d e p l e...more stable East Antarctica and the more mobile West Antarctica. This division is based mainly on the...single continental fragment at this time, while West Antarctica behaved as several small crustal blocks | | VORSTER, CLARISA, KRAMERS, JAN, BEUKES, NIC, VAN NIEKERK, HERMAN (2016) Detrital zircon UâPb ages of the Palaeozoic Natal Group and Msikaba Formation, Kwazulu-Natal, South Africa: provenance areas in context of Gondwana. Geological Magazine, 153 (3) 460-486 doi:10.1017/s0016756815000370 | Journal (article/letter/editorial) | Formations (Natal Group) and the Msikaba Formation (Cape Supergroup) were obtained. A total of 882 concordant...sources of detritus. The NamaquaâNatal Metamorphic Complex is suggested as a possible source of minor late...rocks of the c. 1.1 Ga NamaquaâNatal Metamorphic Complex (NNMC) along the SE coastal margin of South Africa...KwazuluâNatal and the far NE part of the Eastern Cape Province, remain somewhat controversial with regard...stratigraphic relationship to each other and to that of the Cape Supergroup further to the south (Fig. 1). The Msikaba | | | Journal (article/letter/editorial) | Maud Land) +8to+9 (Horlick Mts) +Ito+4 (Vijayan Complex) 1.75 3.5 East Africa 1.3-0.9 0.5 1.0 Australia...Baltica 1.3-1.2 -1to +5 (Kibaran) +2.5 (Fraser Complex) + 2 to +7 (Tromoy) + 3 to + 4 (Bandak Gp) 0.2...high-grade plutonic rocks. In the Van Horn area of West Texas, deformed arc volcanics and sediments are...the late Paleozoic. Mosher (1998) has proposed a complex plate tectonic model for the Texas Grenvillian...Lanka; Y,Yangtze block; C, Cathaysia block; Fk, Falkland plateau; H, Haag nunataks and parts of the TransAntarctic | | | Journal (article/letter/editorial) | to Permian strata in the southern Karoo and Falkland Islands suggests deposition in a separate and distinct...form the present collage of blocks that constitute West Antarctica and the Antarctic Peninsula. Two continental...Ellsworth Mountains in Antarctica and the Falkland Islands off South America, highlight the complexity...Africa and Antarctica. The geology of the Falkland Islands was recognized by Halle (1912) as having similarities...(1952) who realized that the geology of the Falkland Islands â Corresponding author. E-mail addresses: | | | Book | Mitchell -ThomĂŠ GEOLOGY OF THE SOUTH ATLANTIC ISLANDS 1970 GEBRUDER BORNTRAEGER - BERLIN - STUTTGART...STUTTGART GHOPOGY SOUTH OF, PHE ATLANTIC ISLANDS by Dr. Raoul C. Mitchell -ThomĂŠ Consulting Geologist-Geophysicist... Preface The volume herewith treats only of those islands lying in the South Atlantic. There is a valid argument...ago. Dotted throughout these watery wastes are islands, all character- ized, with scarce an exception...to treat in one volume the entire collection of islands of the Atlantic Ocean rather than merely those | | | Journal (article/letter/editorial) | felsic magmatism in the Cretaceous Paresis ring complex, Namibia: evidence for mixing of crust and mantle-derived...discontinuities in metamorphic belts: example of garnet-biotite-albite zone in the Otago schist, New Zealand. Int...Anrdt, N.T., Chauvel, C. and Duncan, R.A. (2000) A complex history for the Caribbean plateau: petrology, geochemistry... 4, No. 2,2001 Mesoproterozoic Cape Meredith Complex, west Falkland. Geol. Mag., v. 137, pp. 537-553 | | | Journal (article/letter/editorial) | continues to the west (Antarctica reconstructed to its position within Gondwana) trough the Falkland Plateau (Cape...(Cape Meredith Complex; Mitchell et al., 1986) and into the Natal Metamorphic Province (South Africa)...regional distribution of K-Ar muscovite (M) and biotite (B) ages in the Heimefrontfjella. In the northwestern...(Kottasberge, Fig. 1) a diorite-tonalite-trondhjemite complex with talc-alkaline geochemical affinities occurs...were completed by late Mesoproterozoic time. To the west of the HSZ metamorphism reached granulite facies | | | Journal (volume) | Mesoproterozoic basement exposed in the West Falkland Islands and Haag nunataks, West Antarctica. The initial ÎľNd..........................................15 3.4 Falkland and Ellsworth-Haag microplates .....................................................16 3.4.1 Falkland microplate......................................g. Corner 1994). Suture zones are geologically complex and tectonically disturbed, and often provide a...of the juncture of East Antarctica, Africa, the Falkland microplate and the Ellsworth-Haag microplate (Jacobs | | Cuadros, Javier, Cesarano, Mara, Dubbin, William, Smith, Stuart W., Davey, Alexandra, Spiro, Baruch, Burton, Rodney G.O., Jungblut, Anne D. (2018) Slow weathering of a sandstone-derived Podzol (Falkland Islands) resulting in high content of a non-crystalline silicate. American Mineralogist, 103 (1) 109-124 doi:10.2138/am-2018-6230 | Journal (article/letter/editorial) | weathering of a sandstone-derived Podzol (Falkland Islands) resulting in high content of a non-crystalline...Jubilee Villas, Ross Road, Stanley, FIQQ 1ZZ, Falkland Islands 4 Environmental Consultant, Cambridge, U.K...influence globally. An Umbric Podzol from the Falkland Islands was studied while investigating possible ways...Thus, our observations indicate the existence of complex, successive weathering steps not yet identified...such as the soil described here. Keywords: Falkland Islands, non-crystalline silicates, podzols, weathering | | Wang, Cheng-Cheng, Jacobs, Joachim, Elburg, Marlina A., Läufer, Andreas, Thomas, Robert J., Elvevold, Synnøve (2020) Grenville-age continental arc magmatism and crustal evolution in central Dronning Maud Land (East Antarctica): Zircon geochronological and HfâO isotopic evidence. Gondwana Research, 82. 108-127 doi:10.1016/j.gr.2019.12.004 | Journal (article/letter/editorial) | Council for Geoscience, 3 Oos Street, Bellville, 7535, Cape Town, South Africa e Norwegian Polar Institute...elevated δ18O values (8â10â°). Samples from further west, na in Gjelsvikfjella have more mantle-like zircon...Natal Belt in southern Africa, which lay to the west in the context of Gondwana, although this assertion...accretion of (slightly older) juvenile oceanic islands in the Natal Belt, which, in contrast to the Maud...Gjelsvikfella and the MĂźhlig-Hofmann-Gebirge re in the west from the Orvin-Wohlthat mountains in the east (Fig | | | Journal (article/letter/editorial) | useful to recollecting dispersal of Pangea, and the complex geographical and geological picture emerging from...its break-up and dispersal after the Triassic. A complex framework of continental blocks and fragments of...Western Gondwana also reveals that it comprises a complex arrangement of a great diversity of large, intermediate...1991), suggesting that Laurentia was placed to the west of Gondwana until early Phanerozoic times (Moores...admitting that Laurentia circumscribed Gondwana to the west. On the other hand, it has to be stressed that these | | | Report (issue) | J. J. Veevers . Southern Africa: Karoo Basin and Cape Fold Belt ...................0404. J. J. Veevers...1992), (4) Grunow et al.âs (1991) reconstruction of West Antarctica, and (5) the clearer dating of the magmatic...Thurston Island: Implications for the tectonics of West Antarctica and Weddell Sea opening: Journal of Geophysical...1990, The Paleozoic and Andean magmatic arcs of West Antarctica and southern South America: Geological...Thus, East (Australia, India and Antarctica) and West (South America and Africa) Gondwanaland can be | | | Journal (article/letter/editorial) | Maud Belt (East Antarctica) and the Northampton Complex (Western Australia) Anna K. Ksienzyk a,â , Joachim...zircon ages from the Maud Belt and the Northampton Complex (Pinjarra Orogen, Western Australia) showed distinct...entirely different set of models place Kalahari to the west of Western Australia (Fig. 2b) with the Maud Belt...crustal block, F â Filchner crustal block, FI â Falkland Islands, G â Grunehogna Craton, H â Heimefrontfjella... SR â Shackleton Range, Sø â Sør Rondane, WCB â West Congo Belt, ZB â Zambezi Belt, ZC â Zimbabwe Craton |
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