Search Results - "Armstrong, R.A."

Improvement of laser ablation in situ micro-analysis to identify diagenetic alteration and measure strontium isotope ratios in fossil human teeth by Willmes, M., Kinsley, L., Moncel, M.-H., Armstrong, R.A., Aubert, M., Eggins, S., Grün, R.

“…Strontium isotope ratios measured in fossil human teeth are a powerful tool to investigate past mobility patterns. In order to apply this method, the sample…”
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Petrographic, geochemical and SHRIMP U–Pb titanite age characterization of the Thabazimbi mafic sills: Extended time frame and a unifying petrogenetic model for the Bushveld Large Igneous Province by Rajesh, H.M., Chisonga, B.C., Shindo, K., Beukes, N.J., Armstrong, R.A.

“…► SHRIMP U–Pb titanite age of Thabazimbi sills indicate they are syn-Bushveld. ► Bushveld LIP consisted of three pulses with separate low-Ti and high-Ti…”
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Geochronology of emplacement and charnockite formation of the Margate Granite Suite, Natal Metamorphic Province, South Africa: Implications for Natal-Maud belt correlations by Mendonidis, P., Thomas, R.J., Grantham, G.H., Armstrong, R.A.

“…•New U-Pb zircon ages from the Natal Metamorphic Province (NMP) are presented.•Four plutons of the Margate Granite Suite (NMP) yielded ages spanning…”
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A new geological framework for south-central Madagascar, and its relevance to the “out-of-Africa” hypothesis by Tucker, R.D., Roig, J.Y., Macey, P.H., Delor, C., Amelin, Y., Armstrong, R.A., Rabarimanana, M.H., Ralison, A.V.

“…▶ Paleoproterozoic terrane identified in south Madagascar. ▶ Greater Dharwar Craton is redefined. ▶ Concept of Azania and the Betsimisaraka suture should be…”
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Evidence for an early Archaean granite from Bastar Craton, India by Rajesh, H. M, Mukhopadhyay, J, Beukes, N. J, Gutzmer, J, Belyanin, G. A, Armstrong, R. A

“…Granitoids in the early Archaean are believed to be potassium-poor tonalite-trondhjemite-granodiorite rocks. Only after continental crust attained sufficient…”
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Tectono-magmatic evolution of the Hutti-Maski Greenstone Belt, India: Constrained using geochemical and geochronological data by Rogers, A.J., Kolb, J., Meyer, F.M., Armstrong, R.A.

“…The Hutti-Maski Greenstone Belt (HMGB), situated in the eastern block of the Dharwar Craton, India is dominated by bimodal volcanics with a minimum magmatic…”
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The age and correlation of the Postmasburg Group, southern Africa: Constraints from detrital zircon grains by Moore, J.M., Polteau, S., Armstrong, R.A., Corfu, F., Tsikos, H.

“…► The maximum age of the Postmasburg Group is constrained by the youngest detrital-zircon age of 2436±7Ma. ► Close similarities in zircon populations exist…”
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Geology of the Monapo Klippe, NE Mozambique and its significance for assembly of central Gondwana by Macey, P.H., Miller, J.A., Rowe, C.D., Grantham, G.H., Siegfried, P., Armstrong, R.A., Kemp, J., Bacalau, J.

“…•We present a revised lithodemic framework for the Monapo Klippe.•New geochronology is presented for emplacement of intrusive rocks and metamorphism.•The…”
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Provenance and tectonic significance of the Palaeoproterozoic metasedimentary successions of central and northern Madagascar by De Waele, B., Thomas, R.J., Macey, P.H., Horstwood, M.S.A., Tucker, R.D., Pitfield, P.E.J., Schofield, D.I., Goodenough, K.M., Bauer, W., Key, R.M., Potter, C.J., Armstrong, R.A., Miller, J.A., Randriamananjara, T., Ralison, V., Rafahatelo, J.M., Rabarimanana, M., Bejoma, M.

“…► Three separate supracrustal successions in Madagascar have similar detrital modes. ► Based on detrital zircon ages, the successions were deposited between…”
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Isotope geochemistry and geochronology of the Nico Pérez Terrane, Rio de la Plata Craton, Uruguay by Mallmann, G., Chemale, F., Ávila, J.N., Kawashita, K., Armstrong, R.A.

“…U–Pb SHRIMP zircon geochronology, bulk-rock geochemistry, and Sr–Nd isotopic data are herein presented in order to better constrain the tectonic evolution of…”
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New SHRIMP, Rb/Sr and Sm/Nd isotope and whole rock chemical data from central Mozambique and western Dronning Maud Land, Antarctica: Implications for the nature of the eastern margin of the Kalahari Craton and the amalgamation of Gondwana by Grantham, G.H., Manhica, A.D.S.T., Armstrong, R.A., Kruger, F.J., Loubser, M.

“…► Lithological units with similar chemistry and age from Mozambique and Maud Belts close to the Kalahari Craton boundary. ► Kalahari Craton probably continues…”
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Geochronological problems related to polymetamorphism in the Limpopo Complex, South Africa by Van Reenen, D.D., Boshoff, R., Smit, C.A., Perchuk, L.L., Kramers, J.D., McCourt, S., Armstrong, R.A.

“…The integration of new and published geochronologic data with structural, magmatic/anatectic and pressure–temperature ( P–T) process information allow the…”
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Mesoproterozoic geology of the Nampula Block, northern Mozambique: Tracing fragments of Mesoproterozoic crust in the heart of Gondwana by Macey, P.H., Thomas, R.J., Grantham, G.H., Ingram, B.A., Jacobs, J., Armstrong, R.A., Roberts, M.P., Bingen, B., Hollick, L., de Kock, G.S., Viola, G., Bauer, W., Gonzales, E., Bjerkgård, T., Henderson, I.H.C., Sandstad, J.S., Cronwright, M.S., Harley, S., Solli, A., Nordgulen, Ø., Motuza, G., Daudi, E., Manhiça, V.

“…The Nampula Block covers over 100,000 km 2, making it the largest Mesoproterozoic crustal segment in northern Mozambique and an important component of the…”
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Tectono-thermal evolution of the Maud Belt: New SHRIMP U–Pb zircon data from Gjelsvikfjella, Dronning Maud Land, East Antarctica by Bisnath, A., Frimmel, H.E., Armstrong, R.A., Board, W.S.

“…The Maud Belt in Dronning Maud Land (western East Antarctic Craton) preserves a high-grade polyphase tectono-thermal history with two orogenic episodes of…”
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Geochronology of the Nchanga Granite, and constraints on the maximum age of the Katanga Supergroup, Zambian Copperbelt by Armstrong, R.A., Master, S., Robb, L.J.

“…The age of the Neoproterozoic Katanga Supergroup, which hosts the stratiform Cu–Co deposits of the Central African Copperbelt, has not been well constrained…”
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Geology and evolution of the Natal belt, South Africa by McCourt, S., Armstrong, R.A., Grantham, G.H., Thomas, R.J.

“…This paper outlines our current understanding of the geology and evolution of the Natal belt, the eastern sector of the ∼400 km wide Mesoproterozoic…”
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The western arm of the Lufilian Arc in NW Zambia and its potential for copper mineralization by Key, R.M., Liyungu, A.K., Njamu, F.M., Somwe, V., Banda, J., Mosley, P.N., Armstrong, R.A.

“…Parts of the Kasai Shield, a western foreland to the Lufilian Arc and the western arm of this orogen are traced into NW Zambia. The Kasai Shield comprises a…”
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Zircon geochronology of the Oribi Gorge Suite, KwaZulu-Natal, South Africa: constraints on the timing of trans-current shearing in the Namaqua–Natal Belt by Eglington, B.M, Thomas, R.J, Armstrong, R.A, Walraven, F

“…The Oribi Gorge Suite is a voluminous suite of rapakivi granite-charnockite plutons which occur in the Mzumbe and Margate terranes of the eastern (Natal)…”
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Geochronology of the Proterozoic Hartley Basalt formation, South Africa: constraints on the Kheis tectogenesis and the Kaapvaal Craton's earliest Wilson Cycle by Cornell, D.H., Armstrong, R.A., Walraven, F.

“…The Hartley Basalt Formation in the Northern Cape of South Africa comprises dominant Fe rich tholeiitic basalt and tuff, with porphyritic andesite found at…”
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A cryptic Mesoarchaean terrane in the basement to the Central African Copperbelt by Rainaud, Christine, Master, S, Armstrong, R. A, Robb, L. J

“…In a study of the geochronology of the Katangan Sequence and its basement in the Central African Copperbelt, detrital and xenocrystic zircons from Muva…”
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