Two distinct Late Mesoproterozoic/Early Neoproterozoic basement provinces in central/eastern Dronning Maud Land, East Antarctica: The missing link, 15–21°E

Jacobs, Joachim; Elburg, Marlina; Läufer, Andreas; Kleinhanns, Ilka C.; Henjes‐Kunst, Friedhelm; Estrada, Solveig; Ruppel, Antonia; Damaske, Detlef; Montero, P.; Беа, Ф.

doi:10.1016/j.precamres.2015.05.003

Cited by 88 publications

(87 citation statements)

References 59 publications

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“…Minor detrital zircons showing Archean to Paleoproterozoic ages have been identified in metamorphic rocks from neighboring Gondwana terranes with dominant late Mesoproterozoic to Neoproterozoic ages such as the Yamato-Belgica Complex (Shiraishi et al, 1994(Shiraishi et al, , 2003 in East Antarctica, Alto Benfica Group and Molócuè Group (Macey et al, 2010) in Nampula Complex, all of which had been affected by the Pan-African metamorphism. Additionally, Jacobs et al (2015) expected the existence of a crustal block at the southern end of the TOAST according to the aeromagnetic signature. These complexes or blocks may have a possibility to be related with the Archean to Mesoproterozoic fragments in the SW terrane.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, the geochronological and geochemical information about pre-Gondwana periods is also important to correlate the terranes before Gondwana amalgamation and to consider how the terranes with different origins collide. For example, Jacobs et al (2015) divided the EAAO into the Tonian oceanic arc super terrane (TAOST) with 1000-900 Ma ages and Maud Belt with 1130-1040 Ma based on the geochronological, geochemical and geophysical data (Fig. 1a).…”

Section: Introductionmentioning

confidence: 99%

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Detrital zircon provenances for metamorphic rocks from southern Sør Rondane Mountains, East Antarctica: A new report of Archean to Mesoproterozoic zircons

Kitano

Osanai

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

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The Sør Rondane Mountains in East Antarctica consist of the various metamorphic rocks and several plutonic rocks, which are related to formation of Gondwana supercontinent. In order to understand the detrital provenances, LA-ICP-MS zircon U-Pb dating were conducted from metamorphosed sedimentary rocks in southern Sør Rondane Mountains. Detrital cores with~990-730 Ma ages were recognized from zircons in the pelitic gneisses and calc-silicate rocks from Menipa, Imingfjella, Mefjell and Arden, while the pelitic gneiss from Tvihøgda exhibited the Archean to Mesoproterozoic ages of~2630-1060 Ma. The Neoproterozoic zircon ages are recognized not only from metamorphosed sedimentary rocks but also from metamorphosed igneous rocks distributed in the central and southern parts of the mountains. However, the Archean to Mesoproterozoic zircon ages are rare in these areas. The results imply the detrital zircons with the Neoproterozoic ages were probably derived from neighbouring igneous rocks (present metamorphosed igneous rocks), while those with Archean to Mesoproterozoic ages have clearly different provenances because of the lack in the Neoproterozoic components. This study suggests the possibility that southern Sør Rondane Mountains can be considered to be juvenile late Mesoproterozoic to Neoproterozoic terrane partly mixed with the Archean to Mesoproterozoic components.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detrital zircon provenances for metamorphic rocks from southern Sør Rondane Mountains, East Antarctica: A new report of Archean to Mesoproterozoic zircons

Kitano

Osanai

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

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“…This unusual configuration has been linked in part to the influence of tectonic inheritance, specifically to earlier collisional and indentation tectonic processes responsible for the assembly of East Antarctica and Africa into Gondwana during Pan-African events ca. 600-500 Ma (Jacobs et al, 2015;Jacobs and Thomas, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…We suggest that the ~60 degrees of rotation unaccounted for by the geophysically imaged Jurassic extension may have occurred during the Permian collisional Gondwanide orogen. Dalziel (2013) and Jacobs et al, (2015) respectively. a) Permian to Jurassic fragmentation of…”

mentioning

confidence: 99%

New geophysical compilations link crustal block motion to Jurassic extension and strike-slip faulting in the Weddell Sea Rift System of West Antarctica

2017

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“…Thus, we suggest the existence of a separate cratonic entity within the present day ice covered Antarctica, as suggested by Fitszimons (2000b). The final suturing and amalgamation of Gondwana is interpreted to result from the closure of smaller scale oceans and arc systems, as indicated by the protracted tectonic signatures recorded in zircon geochronology (Jacobs and Thomas, 2004;Collins and Pisarevsky, 2005;Jacobs et al, 2015). The geochemical and isotopic evidence presented here also provides evidence for the existence of a distinct 'East Antarctic Ocean' between the TOAST and a combined 'Napier-Rayner-Ruker East Antarctic Continent' beneath the ice covered Antarctica.…”

Section: Discussionmentioning

confidence: 52%

Sr and Nd Isotopic evidence in metacarbonate rocks for an extinct Island arc–ocean system in East Antarctica

Otsuji

Satish‐Kumar

Kamei

et al. 2016

Journal of Mineralogical and Petrological Sciences

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Chemically precipitated carbonate sediments directly record seawater composition that helps to decode the Earth's paleo-environment, the existence of paleo-oceans, and provide valuable clues on the paleo-tectonic position of continents through Earth's history. In addition, the geochemical and isotopic composition of carbonate rocks have a strong dependence on the depositional tectonic setting and surrounding source rock composition. This was particularly important in the Precambrian, during which biological activity was less prominent and vegetation was virtually absent. Here we present evidence for the existence of an extinct East Antarctic Ocean and its peripheral oceanic island arc system that preceded the formation of the East Antarctic continent in the Neoproterozoic before the final assembly of Gondwana. Applying a multi-element isotope geochemical approach on chemostratigraphically well-constrained metacarbonate rocks collected from the remote Sør Rondane Mountains in East Antarctica, we present a model on carbonate deposition surrounding an island arc system, mid-ocean volcanic islands and a shallow marine continental shelf of a yet unidentified interior Antarctic continent, all of which accreted in the late Neoproterozoic to early Paleozoic to form the present day East Antarctic continent prior to the final amalgamation of Gondwana supercontinent. Our results support the presence of an oceanic island arc system that might have separated the Mozambique ocean and East Antarctic ocean.

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Two distinct Late Mesoproterozoic/Early Neoproterozoic basement provinces in central/eastern Dronning Maud Land, East Antarctica: The missing link, 15–21°E

Cited by 88 publications

References 59 publications

Detrital zircon provenances for metamorphic rocks from southern Sør Rondane Mountains, East Antarctica: A new report of Archean to Mesoproterozoic zircons

Detrital zircon provenances for metamorphic rocks from southern Sør Rondane Mountains, East Antarctica: A new report of Archean to Mesoproterozoic zircons

New geophysical compilations link crustal block motion to Jurassic extension and strike-slip faulting in the Weddell Sea Rift System of West Antarctica

Sr and Nd Isotopic evidence in metacarbonate rocks for an extinct Island arc–ocean system in East Antarctica

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