Rodinia: the evidence from integrated palaeomagnetism and UâPb geochronology

Buchan, Kenneth L.; Ernst, Richard E.; Hamilton, Michael A.; Mertanen, S.; Pesonen, L. J.; Elming, Sten-åke

doi:10.1016/s0301-9268(01)00178-4

Cited by 107 publications

(33 citation statements)

References 104 publications

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“…Considering the well-established Laurentia-Baltica connection in the period of the Mesoproterozoic (e.g. Buchan et al, 2000Buchan et al, , 2001 and a significant clockwise rotation (up to w808) of Baltica away from Laurentia in the period between 1.2 and 1.1 Ga (Park, 1992), we think that the Geraldes et al (2001) reconstruction of Fig. 9 may represent a configuration of Laurentia-Baltica-Amazonia at the end of the Neoproterozoic.…”

Section: South America and West Africa: Divorced And Re-married Or A mentioning

confidence: 85%

Some key issues in reconstructions of Proterozoic supercontinents

Zhao

Sun

Wilde

et al. 2006

Journal of Asian Earth Sciences

117

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Section: South America and West Africa: Divorced And Re-married Or A mentioning

confidence: 85%

Some key issues in reconstructions of Proterozoic supercontinents

Zhao

Sun

Wilde

et al. 2006

Journal of Asian Earth Sciences

117

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“…The details of these events are very difficult to specify because of a lack of age constraints and because of the varied quality of palaeomagnetic data. An extreme parsimonious approach is to use only the highest quality palaeomagnetic data from multiple localities, precisely (U-Pb) dated from volcanic, shallow intrusions and associated rocks, to provide key palaeomagnetic poles (Buchan et al 2001). On this basis, both Laurentia and Australia were equatorial around 750 Ma, although their relative longitudinal positions are unconstrained (Fig.…”

Section: Palaeomagnetism and Palaeogeographymentioning

confidence: 99%

Neoproterozoic glaciation in the Earth System

Fairchild

Kennedy

2007

JGS

213

116

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The Neoproterozoic contains severe glacial intervals (750–580 Ma) including two extending to low palaeomagnetic latitudes. Paucity of radiometric dates indicates the need for chronostratigraphic tools. Whereas the marine 87 Sr/ 86 Sr signatures show a steady rise, δ 13 C fluctuates, the most reproducible variations being negative signatures in carbonate caps to glacial units, but more diagenetic work is needed. Four conceptual models for the icehouse conditions are contrasted: Zipper-Rift Earth (diachronous glaciation related to continental rift margins), High-tilt Earth (high-obliquity and preferential low-latitude glaciation), Snowball Earth (extreme glaciation related to runaway ice–albedo feedback) and Slushball Earth (coexistence of unfrozen oceans and sea-level glaciers in the tropics). Climate models readily simulate runaway glaciation, but the Earth may not be able to recover from it. The Slushball state requires more extensive modelling. Biogeochemical models highlight the lack of CO 2 buffering in the Neoproterozoic and the likely transition from a methane- to a CO 2 -dominated climate system. Relevant processes include tropical weathering of volcanic provinces, and new land biotas stimulating both clay mineral formation and P delivery to the oceans, facilitating organic C burial. Hence a step change in the Earth System was probably both facilitated by organisms and responsible for moderating Phanerozoic climate.

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“…In recent years, especially in the last decade, a long-lived pre-Rodinia supercontinent, referred to as Columbia or Nuna, has been proposed to have existed during the Paleo to Mesoproterozoic (∼1.8-1.3 Ga) (Rogers and Santosh, 2002, 2004Zhao et al, 2002aZhao et al, , 2004Condie, 2003). Reconstructions of Columbia are limited by the fact that Precambrian paleomagnetic data show a large scatter of poles and have poor age constraints (Buchan et al, 2001;Meert, 2002;Rogers and Santosh, 2002). In this context, comparable geological events (e.g., the coincident mid-Proterozoic rifts in eastern India and western North America) are considered to provide critical evidence for the existence of Columbia (Rogers and Santosh, 2003).…”

Section: Introductionmentioning

confidence: 99%