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Assembly and breakup of the core of Paleoproterozoic-Mesoproterozoic supercontinent Nuna (2011)

Evans, David A.D. ; Mitchell, Ross N.

Geological Society of America (GSA)

In: Geology 39: 443-446.

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Publikationsdatum: 2011-05-01

Beschreibung: Idealized conceptual models of supercontinent cyclicity must be tested against the geologic record using pre-Pangean reconstructions. We integrate tectonostratigraphic records and paleomagnetic data from Siberia, Laurentia, and Baltica to produce a quantitative reconstruction of the core of the Nuna supercontinent at 1.9-1.3 Ga. In our model, the present southern and eastern margins of Siberia juxtapose directly adjacent to, respectively, the arctic margin of Laurentia and the Uralian margin of Baltica. Consistent tectonostratigraphic records of the three cratons collectively indicate the history of Nuna's assembly and breakup. According to this reconstruction, the late Mesoproterozoic transition from Nuna to Rodinia appears to have been much less dramatic than the subsequent late Neoproterozoic transition from Rodinia to Gondwana.

Print ISSN: 0091-7613

Digitale ISSN: 1943-2682

Thema: Geologie und Paläontologie

Publiziert von Geological Society of America (GSA)

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Late Neoproterozoic 40{degrees} intraplate rotation within Australia allows for a tighter-fitting and longer-lasting Rodinia (2011)

Li, Zheng-Xiang ; Evans, David A.D.

Geological Society of America (GSA)

In: Geology 39: 39-42.

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Publikationsdatum: 2011-01-01

Beschreibung: Previous paleomagnetic work has appeared to demand the breakup of southwest United States-East Antarctic (SWEAT) type Rodinia reconstructions before ca. 750 Ma, significantly earlier than the stratigraphic record of rift-drift transition between 715 Ma and 650 Ma. Here we reanalyze Australian paleomagnetic and regional tectonic data to produce a model in which the Precambrian Australian continent had a slightly different configuration before the breakup of Rodinia. A cross-continental megashear zone developed along the Paterson and Petermann orogens at ca. 650-550 Ma, during or after the breakup of Rodinia, manifested as an [~]40{degrees} clockwise rotation of the South and West Australian cratons relative to the North Australian craton around a vertical axis in Central Australia. This model reconciles major paleomagnetic discrepancies within Australia, and allows for a longer lifespan of SWEAT-like reconstructions of Rodinia that are consistent with the Neoproterozoic stratigraphic records of Australia and Laurentia.

Print ISSN: 0091-7613

Digitale ISSN: 1943-2682

Thema: Geologie und Paläontologie

Publiziert von Geological Society of America (GSA)

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