New evidence for a continental rift tectonic setting of the Neoproterozoic Imorona-Itsindro Suite (central Madagascar)

Zhou, Jiu-Long; Li, Xian‐Hua; Tang, Guoqiang; Liu, Yu; Tucker, Robert D.

doi:10.1016/j.precamres.2017.12.029

Cited by 20 publications

(10 citation statements)

References 91 publications

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“…by finding the metamorphic rocks of Buchan facies series in continental rifts (He et al, 2018;Cipar et al, 2020), but also by documenting the formation of 18 O granites in continental rifts (He et al, 2016(He et al, , 2019Zhou et al, 2018Zhou et al, , 2020. In this context, cold to warm subduction leads to amalgamation and assembly rather than breakup and dispersal of supercontinents.…”

Section: Research Papermentioning

confidence: 98%

Extreme metamorphism and metamorphic facies series at convergent plate boundaries: Implications for supercontinent dynamics

Zheng

Chen

2021

Geosphere

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Crustal metamorphism under extreme pressure-temperature conditions produces characteristic ultrahigh-pressure (UHP) and ultrahigh-temperature (UHT) mineral assemblages at convergent plate boundaries. The formation and evolution of these assemblages have important implications, not only for the generation and differentiation of continental crust through the operation of plate tectonics, but also for mountain building along both converging and converged plate boundaries. In principle, extreme metamorphic products can be linked to their lower-grade counterparts in the same metamorphic facies series. They range from UHP through high-pressure (HP) eclogite facies to blueschist facies at low thermal gradients and from UHT through high-temperature (HT) granulite facies to amphibolite facies at high thermal gradients. The former is produced by low-temperature/pressure (T/P) Alpine-type metamorphism during compressional heating in active subduction zones, whereas the latter is generated by high-T/P Buchan-type metamorphism during extensional heating in rifting zones. The thermal gradient of crustal metamorphism at convergent plate boundaries changes in both time and space, with low-T/P ratios in the compressional regime during subduction but high-T/P ratios in the extensional regime during rifting. In particular, bimodal metamorphism, one colder and the other hotter, would develop one after the other at convergent plate boundaries. The first is caused by lithospheric subduction at lower thermal gradients and thus proceeds in the compressional stage of convergent plate boundaries; the second is caused by lithospheric rifting at higher thermal gradients and thus proceeds in the extensional stage of convergent plate boundaries. In this regard, bimodal metamorphism is primarily dictated by changes in both the thermal state and the dynamic regime along plate boundaries. As a consequence, supercontinent assembly is associated with compressional metamorphism during continental collision, whereas supercontinent breakup is associated with extensional metamorphism during active rifting. Nevertheless, aborted rifts are common at convergent plate boundaries, indicating thinning of the previously thickened lithosphere during the attempted breakup of supercontinents in the history of Earth. Therefore, extreme metamorphism has great bearing not only on reworking of accretionary and collisional orogens for mountain building in continental interiors, but also on supercontinent dynamics in the Wilson cycle.

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Section: Research Papermentioning

confidence: 98%

Extreme metamorphism and metamorphic facies series at convergent plate boundaries: Implications for supercontinent dynamics

Zheng

Chen

2021

Geosphere

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“…Understanding the isotopic nature of these magmatic suites in terms of their crustal versus mantle components is important for correlating them with other age‐equivalent terranes. The c. 850–750 Ma Imorona‐Itsindro magmatic suite is widespread in central Madagascar (Archibald et al, ; Archibald, Collins, Foden, & Razakamanana, ; Zhou et al, ), and may be an extension of the Bemarivo Domain. Likewise, there are age‐equivalent terranes in the Seychelles, the Malani Igneous Suite of northwest India, Oman, and the Yangtze Belt of south China.…”

Section: Regional Geology Of the Bemarivo Domainmentioning

confidence: 99%

“…Zircons analyzed from the two Anaboriana Belt samples have evolved ε Hf ( t ) signatures that overlap with values from the Marojejy Terrane samples, but are generally less evolved than those from the slightly older Imorona‐Itsindro Suite (Archibald et al, ; Zhou et al, ). We interpret this evolved signature as the result of incorporation of crustal material during magma genesis.…”

Section: Regional Evolution Of the Bemarivo Domainmentioning

confidence: 99%

“…R scripts to produce plots are provided in Supplementary File C. Data sourced from the following: Alessio et al (), Archibald et al (), Ashwal et al (), Blades et al (), Huang et al (), Long et al (), Morag et al (), Qi et al (), Robinson et al (), Wang et al (), Wang et al (), Zhao et al (), Zheng et al (), Zheng et al (), and Zhou et al ().…”

Section: Links To Rodiniamentioning

confidence: 99%

“…Wang et al () further included the Imorona‐Itsindro suite along with this magmatic arc. However, available ε Hf ( t ) data from the Imorona‐Itsindro Suite of central Madagascar (Archibald et al, ; Zhou et al, ) are predominantly evolved (Figure ), implying that it does not correlate with this juvenile arc system. Oman has also been interpreted as a series of arcs that accreted to Rajasthan in northwest India (which includes the Malani Igneous Suite) during the period c. 850–720 Ma (Blades et al, in review).…”

Section: Links To Rodiniamentioning

confidence: 99%

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Evolving Marginal Terranes During Neoproterozoic Supercontinent Reorganization: Constraints From the Bemarivo Domain in Northern Madagascar

et al. 2019

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Madagascar is a key area for unraveling the geodynamic evolution of the transition between the Rodinia and Gondwana supercontinents as it contains several suites of c. 850–700 Ma magmatic rocks that have been postulated to correlate with other Rodinian terranes. The Bemarivo Domain of northern Madagascar contains the youngest of these units that date to c. 750–700 Ma. We present zircon Hf and O isotope data to understand northern Madagascar's place in the Neoproterozoic plate tectonic reconfiguration. We demonstrate that the northern component of the Bemarivo Domain is distinct from the southern part of the Bemarivo Domain and have therefore assigned new names—the Bobakindro Terrane and Marojejy Terrane, respectively. Magmatic rocks of the Marojejy Terrane and Anaboriana Belt are characterized by evolved εHf(t) signatures and a range of δ18O values, similar to the Imorona‐Itsindro Suite of central Madagascar. These magmatic suites likely formed together in the same long‐lived volcanic arc. In contrast, the Bobakindro Terrane contains juvenile εHf(t) and mantle‐like δ18O values, with no probable link to the rest of Madagascar. We propose that the Bobakindro Terrane formed in a juvenile arc system that included the Seychelles, the Malani Igneous Suite of northwest India, Oman, and the Yangtze Belt of south China, which at the time were all outboard from continental India and south China. The final assembly of northern Madagascar and amalgamation of the Bobakindro Terrane and Marojejy Terrane occurred along the Antsaba subduction zone, with collision occurring at c. 540 Ma.

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Structure and chronology across the Achankovil terrain boundary shear zone system (South India), and its Madagascar connection in the Gondwanaland

Praharaj

Rekha

Bhattacharya

2021

Int J Earth Sci (Geol Rundsch)

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New evidence for a continental rift tectonic setting of the Neoproterozoic Imorona-Itsindro Suite (central Madagascar)

Cited by 20 publications

References 91 publications

Extreme metamorphism and metamorphic facies series at convergent plate boundaries: Implications for supercontinent dynamics

Extreme metamorphism and metamorphic facies series at convergent plate boundaries: Implications for supercontinent dynamics

Evolving Marginal Terranes During Neoproterozoic Supercontinent Reorganization: Constraints From the Bemarivo Domain in Northern Madagascar

Structure and chronology across the Achankovil terrain boundary shear zone system (South India), and its Madagascar connection in the Gondwanaland

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