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Itremo Domain

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Journal Article
Published: 03 March 2020
Journal of the Geological Society (2020) 177 (4): 784–798.
... that are linked to orogenesis of the East African Orogen. In this study, we integrate remote sensing, field data and thermochronology to unravel complex deformation in the Ikalamavony and Itremo domains of central Madagascar. The deformation sequence comprises a gneissic foliation (S 1 ), followed by south- to SW...
FIGURES | View All (10)
Journal Article
Published: 01 December 1998
Journal of the Geological Society (1998) 155 (6): 1009–1024.
...RÓNADH COX; RICHARD A. ARMSTRONG; LEWIS D. ASHWAL Abstract Proterozoic metasediments of the Itremo Group in central Madagascar probably represent a passive margin sequence predating Gondwana assembly. The quartzites are well-sorted quartz arenites that contain flat lamination, wave ripples, current...
Image
Geological map, structural data and cross-sections through the <b>Itremo</b>–Antan...
Published: 03 March 2020
Fig. 5. Geological map, structural data and cross-sections through the Itremo–Antananarivo Domain using both our new data and previously published data ( Macey et al. 2009 ). Measured fold axes are generally interpreted to be F 2 folds as we do not observe any overprinting fold generations
Journal Article
Published: 01 February 2006
The Canadian Mineralogist (2006) 44 (1): 87–103.
... and orthogneiss of the Neoproterozoic Itremo Group, of medium metamorphic grade. The subhorizontal bodies of pegmatite are strongly zoned and, in the mineralized area called Sarodivotra, they show a rich paragenetic assemblage in which Ti–Nb–Ta-bearing minerals occur. We recognize two generations of pyrochlore...
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Journal Article
Published: 01 January 2000
Geological Magazine (2000) 137 (1): 39–51.
..., i.e. directly above the Antananarivo block. The boundary between the Itremo sheet and the Antananarivo block is split into two domains based on their kinematic and structural styles. West of Antsirabe (Fig. 1 ), the boundary is imbricated, and preserves evidence of contractional deformation (top...
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Journal Article
Published: 01 February 2011
Canadian Journal of Earth Sciences (2011) 48 (2): 389–417.
... terranes derived from East Africa ( It , Itremo; Ant , Antananarivo) and the Dharwar Craton of India ( A , Antongil; M , Masora). A–A, Afif–Abas terrane; B , Bemarivo domain; MB , Mozambique belt (accreted southern terranes of Androyen and Vohibory); Sey , Seychelles. The present paper...
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Image
Fig. 2.  ( a ) Tectonic <b>domains</b> of the Malagasy shield (exposed Precambrian...
Published: 01 February 2011
, the Vohibory (V), Androyen (Ad), Anosyen (As), Ikalamavony–Itremo (Ik–It), Antananarivo (A), Betsimisaraka domain (BS), Antongil–Masora (A/M), and Bemarivo (B) domains. The Antananarivo domain includes a major subdomain, the Tsaratanana Complex, comprising the following: Bk, Bekadoka; M, Maevatanana
Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2011
DOI: 10.1144/SP357.4
EISBN: 9781862396050
... Complex, the Neoproterozoic Bemarivo Belt and the Itremo Domain comprising Proterozoic metasedimentary rocks (Fig.  2 ; Collins et al. 2000 ; Kröner et al. 2000 ; Collins & Windley 2002 ; Collins 2006 ). Recent work has shown that while all parts of the EAAO shared a common end-Proterozoic...
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Journal Article
Published: 31 July 2017
Journal of the Geological Society (2018) 175 (1): 111–129.
.... 1035 and 982 Ma ( CGS 2009 a ; Rakotoarimanana 2001 ; Tucker et al. 2007 , 2011 b ). The poorly understood Molo Group is a minor group of metaclastic rocks that crop out to the west of the Itremo Domain near the margin with the Ikalamavony Domain ( Fig. 2 ). The Molo Group's detrital zircon...
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Image
Geological map, structural data and cross-section through the Antananarivo ...
Published: 03 March 2020
Fig. 7. Geological map, structural data and cross-section through the Antananarivo Domain. This transect does not contain the complex folding that we observe in the Ikalamavony and Itremo domains. Here, foliations are steeply west-dipping. Geological polygons are from Roig et al. (2012
Image
Schematic cross-section through central Madagascar from Miandrivazo to Bric...
Published: 03 March 2020
Fig. 9. Schematic cross-section through central Madagascar from Miandrivazo to Brickaville, combining the cross-sections of Figures 4 , 5 and 7 and that of Collins et al. (2003 a ) . The Ikalamavony and Itremo domains preserve the same structural styles and kinematics. A change
Image
Schematic diagram showing our interpretation of the evolution of central Ma...
Published: 03 March 2020
); ( b ) at c . 1000 Ma the Dabolava Arc forms as an oceanic island arc outboard from the Antananarivo Domain ( Archibald et al. 2017 a ); ( c ) prior to the intrusion of the c . 850–750 Ma Imorona–Itsindro Suite, the Ikalamavony Domain is thrust over the Antananarivo–Itremo Domain; ( d
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Examples of samples and field outcrops; latitude and longitude are given in...
Published: 03 March 2020
Group of the Itremo sub-domain; ( c ) S 1 foliation folded around an F 2 fold in the Itremo sub-domain; ( d ) S 1 foliation folding around F 2 folds in the Itremo sub-domain; ( e ) S 1 foliation in a sample of augen gneiss of the Betsiboka Suite in the Antananarivo Domain; ( f ) S 1 foliation
Journal Article
Journal: GSA Bulletin
Published: 01 May 2014
GSA Bulletin (2014) 126 (5-6): 791–811.
... Mesoproterozoic, and evolved Neoproterozoic sources. These detrital signatures best fit the combined basement ages of the Congo-Tanzania-Bangweulu block and central Madagascar (Azania), thus linking the tectonic evolution of the southernmost tip of India to these domains throughout much of the Proterozoic...
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Journal Article
Published: 01 June 2001
South African Journal of Geology (2001) 104 (2): 151–166.
... of Archaean rocks, particularly in Tanzania and Madagascar, characterize the MB of East Africa and Madagascar, and these rocks either constitute marginal parts of cratonic domains or represent crustal blocks (terranes or microcontinents?) of unknown derivation. Furthermore, there is evidence for extensive...
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Journal Article
Published: 01 February 2008
American Mineralogist (2008) 93 (2-3): 263–269.
... undoubtedly instances of oblique contact, and as a result, the development of zones of oblique divergence (i.e., transtension: Dewey 2002 ) generally coeval with zones of convergence elsewhere in the region. In the Itremo region, in south-central Madagascar, the oldest migmatitic gneisses are late...
FIGURES
Journal Article
Published: 01 July 2018
European Journal of Mineralogy (2018) 30 (4): 869–876.
..., hydrokenopyrochlore occurs as tan to beige subhedral octahedral crystals, up to ∼1 mm across. Streak is white, fracture is irregular, and luster is resinous. Scanning electron microscopy revealed that the crystals are porous, with hydrokenopyrochlore occurring as relict domains, closely associated with quartz...
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Series: Geological Society, London, Memoirs, Geological Society, London, Memoirs
Published: 01 January 2015
DOI: 10.1144/M43.20
EISBN: 9781862397194
... Ghats Province; CB, Cuddapah Basin; KP, Krishna Province; SB, Salem Block; CSS, Cauvery Shear System; MB, Madurai Block; TB, Trivandrum Block; BM, Bemarivo domain; An, Antongil Craton; Ant, Antananarivo Craton; Ms, Masora Craton; Ik, Ikalamavony subdomain; A-M, Anaboriana–Manapotsy; (a) Itremo Group; (b...
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Journal Article
Published: 01 December 1999
Journal of the Geological Society (1999) 156 (6): 1125–1135.
.... Ashwal L.D. Sedimentology, geochronology, and provenance of the Proterozoic Itremo Group, central Madagascar, and implications for pre-Gondwana palaeogeography Journal of the Geological Society, London 1998 155 1009 1024 Drury S.A. Harris N.B.W. Holt R.W. Reeves-Smith G.J...
Journal Article
Published: 01 March 2008
Journal of the Geological Society (2008) 165 (2): 511–522.
... monazite extracted from the granitoid gneiss sample IBL2023-1. The more chemically complex grain IBL2023-1-1 displays two domains in the BSE image ( Fig. 3a ). A total of 35 analyses were carried out on it. Of these, 13 were made in domain 1, the lighter grey area enclosed by a white dashed line ( Fig. 3a...
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