New evidence for a volcanic arc on the western margin of a rifting Rodinia from ultramafic intrusions in the Andriamena region, north-central Madagascar

Bybee, G. M.; Ashwal, Lewis D.; Wilson, A. H.

doi:10.1016/j.epsl.2010.02.017

Cited by 44 publications

(19 citation statements)

References 41 publications

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“…Moreover, the petrochemical features of the amphibolites reported in this study are comparable to those of Neoproterozoic mafic intrusive rocks from the Seychelles, Andriamena region of north-central Madagascar, and Malani Igneous Suite of northwest India (Tucker et al, 2001;Gregory et al, 2009;Bybee et al, 2010;Pradhan et al, 2010). Thus, we propose that the Seychelles, Madagascar and Lhasa terranes were adjacent to the western and northern margins of Greater India, in a slightly revised configuration of Rodinia supercontinent as proposed by Torsvik et al (1996), Meert and Torsvik (2003), Rino et al (2008) and Bybee et al (2010).…”

Section: Tectonic Implicationssupporting

confidence: 63%

“…Recently, some studies have demonstrated that the Neoproterozoic granitoids and associated basaltic magmas from the Seychelles, Madagascar and northwestern India were formed in a contiguous continental arc, indicating the existence of an active Andean-type orogeny on the northwestern edge of the Rodinia supercontinent between 800 and 700 Ma (e.g., Torsvik et al, 1996;Tucker et al, 2001;Meert and Torsvik, 2003;Li et al, 2008b;Rino et al, 2008;Gregory et al, 2009;Bybee et al, 2010) (Fig. 9).…”

Section: Tectonic Implicationsmentioning

confidence: 97%

“…The global Neoproterozoic magmatism has commonly been attributed to mantle plumes or a mantle superplume that caused Torsvik et al, 1996;Meert and Torsvik, 2003;Zhou et al, 2006;Rino et al, 2008;Bybee et al, 2010), showing the distribution of late Mesoproterozoic-early Neoproterozoic convergence plate margin and the positions of lithologies with an Andean-arc affinity (labeled in black). the rifting and fragmentation of the Neoproterozoic supercontinent Rodinia (e.g., Heaman et al, 1992;Zhao et al, 1994;Park et al, 1995;Li et al, 1999Li et al, , 2002aLi et al, ,b, 2006Frimmel et al, 2001;Shellnutt et al, 2004;Maruyama et al, 2007;Wang et al, 2009b).…”

Section: Tectonic Implicationsmentioning

confidence: 99%

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Late Neoproterozoic thermal events in the northern Lhasa terrane, south Tibet: Zircon chronology and tectonic implications

Dong

Zhang

Santosh

et al. 2011

Journal of Geodynamics

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Section: Tectonic Implicationssupporting

confidence: 63%

Section: Tectonic Implicationsmentioning

confidence: 97%

Section: Tectonic Implicationsmentioning

confidence: 99%

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Late Neoproterozoic thermal events in the northern Lhasa terrane, south Tibet: Zircon chronology and tectonic implications

Dong

Zhang

Santosh

et al. 2011

Journal of Geodynamics

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“…Metamorphosed equivalents are exposed in the Mozambique Belt as the Eastern Granulites of Kenya and Tanzania with 0.85-0.65 Ga calc-alkaline protoliths Muhongo et al, 2001;Maboko and Nakamura, 2002), the Vohibory Domain of southwest Madagascar with 0.85-0.67 Ga basaltic and granitic protoliths (Jöns and Schenk, 2008;Boger et al, 2015), and the Cabo-Delgado Nappe Complex of Mozambique with 0.82-0.70 Ga gabbroic, tonalitic and granitic protoliths (Viola et al, 2008;Boyd et al, 2010). Although it is difficult to trace ophiolite units into the Mozambique Belt (Berhe, 1990;Shackleton, 1996) Granite and gabbro of the 0.85-0.70 Ga ImoronaItsindro Suite in Madagascar Bybee et al, 2010;Moine et al, 2014) and similar rocks in the Madurai Block of India (Teale et al, 2011;Plavsa et al, 2012;Santosh et al, 2012) have been interpreted as a continental arc linked to a possible second suture at the western edge of the Antongil and Masora domains in Madagascar and southern edge of the Dharwar Craton in India (Fig. 4a).…”

Section: Cryogenian Magmatic Arcs and Ophiolitementioning

confidence: 99%

Pan–African granulites of Madagascar and southern India: Gondwana assembly and parallels with modern Tibet

Fitzsimons

2016

Journal of Mineralogical and Petrological Sciences

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Granulites of the southern East African Orogen formed by continental collision during Gondwana assembly. The highest metamorphic gradients of 25-50°C km −1 were attained at 0.58-0.53 Ga in a microcontinental block that was sandwiched between two collisional sutures and is now exposed in Madagascar and southern India. The 50 Myr duration of extreme pressure-temperature (P-T) conditions and lack of coeval mantle magmatism suggest that metamorphism was driven by radiogenic heat accumulation beneath a long-lived orogenic plateau. Bounding sutures most likely record transfer of this microcontinent across the Neoproterozoic Mozambique Ocean, analogous to Gondwanan terranes that crossed Tethys before final India-Asia collision and, like Tibet, these sutures mark the edges of a plateau that formed following terminal ocean closure and collision. Both sutures record moderate metamorphic gradients of 15-25°C km −1 but with quite different ages. Metamorphism along the western suture at 0.65-0.61 Ga followed the end of magmatism in an adjacent 0.85-0.65 Ga ocean-arc terrane. It has an anti-clockwise P-T path that reflects preferential thickening of the hot arc during early stages of collision, and dates ocean closure at the western suture. Metamorphism along the eastern suture at 0.53-0.51 Ga has a clockwise P-T path and is widely assumed to date terminal collision in the East African Orogen. However, this event was coeval with rapid exhumation of granulites in the adjacent plateau and is more likely to reflect reactivation of a much older eastern suture during plateau collapse. Great care should be taken when using metamorphism to date ocean closure in ancient orogens. Rocks with hot metamorphic gradients give poor age constraints on initial collision because peak T is attained >50 Myr after ocean closure if radioactivity is a major part of the heat budget. Suture zone rocks with moderate metamorphic gradients can provide more reliable estimates for the time of ocean closure but are also prone to later reactivation in orogens with protracted histories.

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“…1), which was believed to be totally individualized from the fragmentation of a Rodinian supercontinent between 1.1 Ga and 750 Ma (e.g., Dalziel, 1991;Moores, 1991;Hoffman, 1991;Dalziel, 1995;Torsvik et al, 1996;Meert, 2001;Torsvik, 2003;Meert and Torsvik, 2003;Rino et al, 2008;Bybee et al, 2010). The oceanic crust that was originally part of this paleoplate was totally consumed during the Brasiliano-Pan African orogeny at the end of the Neoproterozoic (i.e., mainly during the Ediacaran), which produced marginal magmatic arcs and fold-thrust belts and finally integrated into the Gondwana paleocontinent (e.g., Pedrosa-Soares et al, 2001;Alkmim et al, 2007;Meert, 2003).…”

Section: Geological Settingmentioning

confidence: 98%

Constraints on the Statherian evolution of the intraplate rifting in a Paleo-Mesoproterozoic paleocontinent: New stratigraphic and geochronology record from the eastern São Francisco craton

et al. 2015

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An integrated approach of stratigraphic analysis and U-Pb age dating reveals some information on the tectonosedimentary evolution of the Statherian cover of the São Francisco craton in the so-called Espinhaço basin (Atlantic shield in eastern Brazil). Here, continental sedimentation patterns, such as alluvial fan, braided-plain and lacustrine facies associations, with associated volcanic rocks are documented in two superposed basin fill-successions, which are defined as the Algodão and Sapiranga Synthems and grouped in the Botuporã Supersynthem. Both studied units consist mainly of conglomerates and cross-bedded sandstones and minor amounts of mudstones, sedimentary breccias, volcanic lava beds and volcaniclastic rocks, which were deposited in a rift basin -the Botuporã rift -during two syn-rifting phases. The Algodão Synthem represents the first rifting phase. The basal synsedimentary conglomerates of this unit were deposited mainly by subaerial debris flows, most likely along and near a rift border fault. The framework of this rock consists of only crystalline rock clasts from the basement and no fragments of volcanic rocks. Detrital zircon grains that were extracted from this facies show ages older than 2.05 Ga. The remainder of the section is dominated by fluvial sandy lithofacies with minor conglomerate lenses and sandstone-mudstone heterolithic lithofacies, which represent distal, waning-flood deposits in a lacustrine environment. The upper section also contains hummocky cross-stratified sandstone lithofacies, which are related to a storm-influenced deposition. On top of the Algodão succession, the volcanic rocks were dated at 1775 ± 7 Ma, which was interpreted as the near final age of the first rift-phase. Representing the second rift-phase, the Sapiranga Synthem shows similar sedimentation patterns to the Algodão Synthem. The Sapiranga Synthem rests directly on the volcanic rocks of the Algodão Synthem, and its basal conglomerates (which are most likely also related to a master fault) contain voluminous clasts of volcanic rocks, sandstones and crystalline rocks. The detrital zircon grains that were extracted from this facies show ages of 1741 ± 14 and 1766 Ma as well older than 2.05 Ga. The volcanic rocks on the upper succession of the Sapiranga Synthem record ages of 1740 ± 10 Ma, which finalized the Botuporã rift evolution. A preliminary geochemical study of volcanic rocks from the Botuporã Supersynthem showed that these rocks are alkaline rocks with high K 2 O/Na 2 O ratios, which belong to an ultrapotassic suite. The low concentrations of MgO wt.% suggest a felsic ultrapotassic character. The Botuporã Supersynthem is unconformably covered by a volcanosedimentary rift-succession of EoCalymmian age -the Pajeú Synthem, which represents the second rifting stage of the Espinhaço basin. Several Statherian-related volcano-sedimentary sequences and anorogenic granitoids occur dispersed in the São Francisco block, which requires a regional geologic model to explain the extensional and magmatism process during ...

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New evidence for a volcanic arc on the western margin of a rifting Rodinia from ultramafic intrusions in the Andriamena region, north-central Madagascar

Cited by 44 publications

References 41 publications

Late Neoproterozoic thermal events in the northern Lhasa terrane, south Tibet: Zircon chronology and tectonic implications

Late Neoproterozoic thermal events in the northern Lhasa terrane, south Tibet: Zircon chronology and tectonic implications

Pan–African granulites of Madagascar and southern India: Gondwana assembly and parallels with modern Tibet

Constraints on the Statherian evolution of the intraplate rifting in a Paleo-Mesoproterozoic paleocontinent: New stratigraphic and geochronology record from the eastern São Francisco craton

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