Paleomagnetism of Early Cambrian Itabaiana mafic dikes (NE Brazil) and the final assembly of Gondwana

Trindade, R. I.; D’Agrella-Filho, Manoel S.; Epof, Igor; Neves, Benjamim B. Brito

doi:10.1016/j.epsl.2005.12.039

Cited by 165 publications

(110 citation statements)

References 61 publications

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“…Minor transcurrent motions between West Africa and Amazon, sometime between original craton assembly at 2.1 Ga (Ledru et al 1994) and their Gondwanan amalgamation in the Cambrian (e.g. Trindade et al 2006), are proposed based on limited palaeomagnetic data from those two blocks (Onstott & Hargraves 1981;Onstott et al 1984;Nomade et al 2003). Such minor amounts of relative displacement would preserve the proposed tectonic correlations among the Atlantica cratons, but further palaeomagnetic testing is needed.…”

Section: Supercontinentsmentioning

confidence: 99%

Palaeoproterozoic supercontinents and global evolution: correlations from core to atmosphere

Reddy

Evans

2009

115

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The Palaeoproterozoic era was a time of profound change in Earth evolution and represented perhaps the first supercontinent cycle, from the amalgamation and dispersal of a possible Neoarchaean supercontinent to the formation of the 1.9-1.8 Ga supercontinent Nuna. This supercontinent cycle, although currently lacking in palaeogeographic detail, can in principle provide a contextual framework to investigate the relationships between deep-Earth and surface processes. In this article, we graphically summarize secular evolution from the Earth's core to its atmosphere, from the Neoarchaean to the Mesoproterozoic eras (specifically 3.0-1.2 Ga), to reveal intriguing temporal relationships across the various 'spheres' of the Earth system. At the broadest level our compilation confirms an important deep-Earth event at c. 2.7 Ga that is manifested in an abrupt increase in geodynamo palaeointensity, a peak in the global record of large igneous provinces, and a broad maximum in several mantle-depletion proxies. Temporal coincidence with juvenile continental crust production and orogenic gold, massive-sulphide and porphyry copper deposits, indicate enhanced mantle convection linked to a series of mantle plumes and/or slab avalanches. The subsequent stabilization of cratonic lithosphere, the possible development of Earth's first supercontinent and the emergence of the continents led to a changing surface environment in which voluminous banded iron-formations could accumulate on the continental margins and photosynthetic life could flourish. This in turn led to irreversible atmospheric oxidation at 2.4-2.3 Ga, extreme events in global carbon cycling, and the possible dissipation of a former methane greenhouse atmosphere that resulted in extensive Palaeoproterozoic ice ages. Following the great oxidation event, shallow marine sulphate levels rose, sediment-hosted and iron-oxide-rich metal deposits became abundant, and the transition to sulphide-stratified oceans provided the environment for early eukaryotic evolution. Recent advances in the geochronology of the global stratigraphic record have made these inferences possible. Frontiers for future research include more refined modelling of Earth's thermal and geodynamic evolution, palaeomagnetic studies of geodynamo intensity and continental motions, further geochronology and tectonic syntheses at regional levels, development of new isotopic systems to constrain geochemical cycles, and continued innovation in the search for records of early life in relation to changing palaeoenvironments.

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Section: Supercontinentsmentioning

confidence: 99%

Palaeoproterozoic supercontinents and global evolution: correlations from core to atmosphere

Reddy

Evans

2009

115

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“…Otherwise, the close fit of the 525 Ma poles from Amazonia and proto-Gondwana (in a Gondwana pre-drift configuration) might show that complete closure of Clymene Ocean occurred only at Ediacaran times ). In the model proposed by Trindade et al (2006), West Gondwana was formed diachronically, similarly to the East Gondwana whose final amalgamation occurred only at 525 Ma (Meert & Van der Voo 1997).…”

Section: The Amazonian Craton In Gondwanamentioning

confidence: 99%

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

et al. 2016

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In the last decade, the participation of the Amazonian Craton on Precambrian supercontinents has been clarified thanks to a wealth of new paleomagnetic data. Paleo to Mesoproterozoic paleomagnetic data favored that the Amazonian Craton joined the Columbia supercontinent at 1780 Ma ago, in a scenario that resembled the South AMerica and BAltica (SAMBA) configuration. Then, the mismatch of paleomagnetic poles within the Craton implied that either dextral transcurrent movements occurred between Guiana and Brazil-Central Shield after 1400 Ma or internal rotation movements of the Amazonia-West African block took place between 1780 and 1400 Ma. The presently available late-Mesoproterozoic paleomagnetic data are compatible with two different scenarios for the Amazonian Craton in the Rodinia supercontinent. The first one involves an oblique collision of the Amazonian Craton with Laurentia at 1200 Ma ago, starting at the present-day Texas location, followed by transcurrent movements, until the final collision of the Amazonian Craton with Baltica at ca. 1000 Ma. The second one requires drifting of the Amazonian Craton and Baltica away from the other components of Columbia after 1260 Ma, followed by clockwise rotation and collision of these blocks with Laurentia along Grenvillian Belt at 1000 Ma. Finally, although the time Amazonian Craton collided with the Central African block is yet very disputed, the few late Neoproterozoic/Cambrian paleomagnetic poles available for the Amazonian Craton, Laurentia and other West Gondwana blocks suggest that the Clymene Ocean separating these blocks has only closed at late Ediacaran to Cambrian times, after the Amazonian Craton rifted apart from Laurentia at ca. 570 Ma.

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“…These continental domains coalesced during the Sunsas (Grenvilleage) orogeny (Loewy et al, 2004;Tohver et al, 2002Tohver et al, , 2004Casquet et al, 2008). This large continent collided obliquely with the Rio de la Plata and Kalahari cratons to the east (present coordinates) to produce the Pampean orogeny in the early Cambrian, with the disappearance of the intervening Clymene Ocean (Trindade et al, 2006).…”

Section: Geological and Paleogeographical Settingmentioning

confidence: 99%

A deformed alkaline igneous rock–carbonatite complex from the Western Sierras Pampeanas, Argentina: Evidence for late Neoproterozoic opening of the Clymene Ocean?

Casquet

Pankhurst

Galindo

et al. 2008

Precambrian Research

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A deformed ca. 570 Ma syenite-carbonatite body is reported from a Crenville-age (1.0-1.2 Ca) terrane in the Sierra de Maz, one of the Western Sierras Pampeanas of Argentina. This is the first recognition of such a rock assemblage in the basement of the Central Andes. The two main lithologies are coarse-grained syen ite (often nepheline-bearing) and enclave-rich fine-grained foliated biotite-calcite carbonatite. Samples of carbonatite and syenite yield an imprecise whole rock Rb-Sr isochron age of 582 ± 60 Ma (MSWD = 1.8; Sri = 0.7029); SHRIMP U-Pb spot analysis of syenite zircons shows a total range of2 0 6Pb_238U ages between 433 and 612 Ma, with a prominent peak at 560-580 Ma defined by homogeneous zircon areas. Te xtural interpretation of the zircon data, combined with the constraint of the Rb-Sr data suggest that the car bonatite complex formed at ca. 570 Ma. Further disturbance of the U-Pb system took place at 525 ± 7 Ma (Pampean orogeny) and at ca. 430-440 Ma (Famatinian orogeny) and it is concluded that the Western Sierras Pampeanas basement was joined to Condwana during both events. Highly unradiogenic values in calcites (0.70275-0.70305) provide a close estimate for the initial Sr isotope composition of the carbonatite magma. Sm-Nd data yield BNds7 0 values of +3.3 to +4.8. The complex was probably formed during early opening of the Clymene Ocean from depleted mantle with a component from MesojNeo proterozoic lower continental crust.

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Paleomagnetism of Early Cambrian Itabaiana mafic dikes (NE Brazil) and the final assembly of Gondwana

Cited by 165 publications

References 61 publications

Palaeoproterozoic supercontinents and global evolution: correlations from core to atmosphere

Palaeoproterozoic supercontinents and global evolution: correlations from core to atmosphere

Paleomagnetism of the Amazonian Craton and its role in paleocontinents

A deformed alkaline igneous rock–carbonatite complex from the Western Sierras Pampeanas, Argentina: Evidence for late Neoproterozoic opening of the Clymene Ocean?

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