Assembly, configuration, and break-up history of Rodinia: A synthesis

Li, Z.X.; Bogdanova, Svetlana; Collins, Alan S.; Davidson, A; Waele, Bert De; Ernst, Richard E.; Fitzsimons, I. C. W.; Fuck, Reinhardt A.; Гладкочуб, Д.П.; Jacobs, Joachim; Karlstrom, Karl E.; Song-nian, LU; Natapov, Lev M.; Pease, Victoria; Pisarevsky, Sergei; Thrane, Kristine; Vernikovsky, V. A.

doi:10.1016/j.precamres.2007.04.021

Cited by 2,951 publications

(1,571 citation statements)

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“…the CIA values of fresh basalts (CIA = 30-45%, Nesbitt and Young, 1982 and U, in covariance diagrams (Cann, 1970, Li et al, 2008, 2010. As shown in Figure 9, the trace elements possess a linear relationship with Zr, which indicates that the trace elements are immobile during later ocean floor alteration and metamorphism.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Basalts and picrites from a plume-type ophiolite in the South Qilian Accretionary Belt, Qilian Orogen: Accretion of a Cambrian Oceanic Plateau?

Zhang

Song

Yang

et al. 2017

Lithos

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'Basalts and picrites from a plume-type ophiolite in the South Qilian Accretionary Belt, Qilian Orogen : accretion of a Cambrian Oceanic Plateau? ', Lithos.,[278][279][280][281] Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Basalts and picrites from a plume-type ophiolite in the South Qilian Accretionary Belt, Qilian Orogen: Accretion of a Cambrian Oceanic Plateau?

Zhang

Song

Yang

et al. 2017

Lithos

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“…A hydrothermal heat flux is therefore prescribed here at the bottom of the ocean and is spatially uniform except where enhanced flux is prescribed to simulate the effect of spreading ridges. These enhanced geothermal areas are prescribed in the model runs shown in the paper to be not far from the equator (motivated by the Neoproterozoic continental reconstruction of 30 ), and the geothermal flux there is up to four times its background value. The observed background flux away from ocean ridges is about 0.05 W m −2 , and the flux observed at mid--ocean ridges is about 4 times larger, such that the average over ocean basins is estimated to be of the order of 0.1 Wm −2 (see, for example, Table 4 of 39 ).…”

Section: Model Descriptionmentioning

confidence: 99%

Dynamics of a Snowball Earth ocean

Ashkenazy

Gildor

Lösch

et al. 2013

Nature

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Geological evidence suggests that marine ice extended to the equator at least twice during the Neoproterozoic (∼750-635 Myr ago) 1, 2 , inspiring the Snowball Earth hypothesis that the Earth was globally ice covered 3, 4 . In a possible Snowball Earth climate, ocean circulation and mixing processes would have determined the melting and freezing rates that determine ice thickness 5,6 , influenced the survival of photosynthetic life 4,5,7-9 , and may provide important constraints for the interpretation of geochemical and sedimentological observations 4,10 . Here we show that in a Snowball Earth, the ocean would have been well mixed and characterized by a dynamic circulation 11 , with vigorous equatorial meridional overturning circulation, zonal equatorial jets, a well-developed eddy field, strong coastal upwelling and convective mixing. This is in contrast to the sluggish ocean often expected in a snowball scenario 3 .As a result of vigorous convective mixing, the ocean temperature, salinity and density were either uniform in the vertical or weakly stratified in a few locations. Our results are based on a coupled ice flow-ocean circulation model driven by a weak geothermal heat flux under a global ∼1 km ice cover. Compared to the modern ocean, the snowball ocean had far larger vertical mixing rates, and comparable horizontal mixing by ocean eddies. The strong circulation and coastal upwelling resulted in melting rates near continents as much as ten times larger than previously estimated 6, 7 . While we cannot resolve the ongoing debate on the existence of a global snowball ice cover 10,12,13 , we discuss the implications to nutrient supply for photosynthetic activity and to banded iron formations. The new insights and constraints on ocean dynamics may help resolve the Snowball Earth controversy when combined with future geochemical and geological observations.The flow of thick ice over a Snowball ocean ("sea glaciers", characterized by very different dynamics from thinner sea ice 14 ), has received significant attention over the past few years [5][6][7]9,14,15 . Similarly, the role and dynamics of atmospheric circulation and heat transport, CO2 concentration, cloud feedbacks, and continental configuration have been studied [16][17][18] , as has the role of dust over the Snowball ice cover 17,19 . In contrast, despite its importance, the ocean circulation during Snowball events has received little attention. The few studies that used full ocean General Circulation Models (GCMs) concentrated mostly on the ocean role in Snowball initiation and aftermath 20,21 . None of these studied accounted for the combined effects of thick ice cover flow and driving by geothermal heating 11,13,22,23 , yet 11 simulated an ocean under a 200 m thick ice cover with no geothermal heat flux, and calculated a non steady--state solution with near--uniform temperature and salinity, and vanishing Eulerian circulation together with a strong parameterized eddy--induced high latitude circulation cells.To allow simulating the special circumstan...

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“…The two blocks have been considered to have amalgamated at the end of the Mesoproterozoic to form the Sibao Orogen (inset of Fig. 1) associated with the assembly of Rodinia and to occupy an intracratonic keystone position between Australia and Laurentia (e.g., Li et al, 1995Li et al, , 2002Li et al, , 2008cCharvet et al, 1996;Ye et al, 2007;Boger et al, 2000;Li et al, 2008bLi et al, , 2009). However, an interior location within Rodinia does not fit readily with the presence of early Neoproterozoic (∼970-900 Ma) rock units of arc or back-arc basin affinities in the easternmost Yangtze Block (e.g., Shui, 1988;Li et al, , 2008aLi et al, 2006Li et al, , 2009Ye et al, 2007;Gao et al, 2009;Chen et al, 2009a,b;Shu et al, 2011;Cawood et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Wang

Zhang

Cawood

et al. 2013

Precambrian Research

231

121

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Keywords:Metabasic rocks MORB-and/or arc-like geochemical signatures Earliest Neoproterozoic Arc and back-arc system Eastern South China Block Periphery of Rodinia a b s t r a c t U-Pb geochronology along with elemental and Nd-Hf-Os isotopic data from the earliest Neoproterozoic metabasic rocks within the Cathaysia Block of the South China Block (SCB) constrain the tectonic setting and paleogeography of the block within the Rodinia supercontinent. The metabasic rocks give zircon U-Pb ages of 969-984 Ma, ε Hf (t) values of +1.8 to +15.3 and Hf model ages of 0.92-1.44 Ga. They are subalkaline basalts that can be geochemically classified into four groups. Group 1 has low Nb contents (1.24-4.33 ppm), highly positive ε Nd (t) values (+4.3 to +5.2), and REE and multi-elemental patterns similar to fore-arc MORB-type basalt. Group 2 has Nb contents ranging from 3.13 ppm to 6.48 ppm, ε Nd (t) of +3.1 to +6.2, low Re and Os contents and high initial Os isotopic ratios, and displays an E-MORB geochemical signature. Group 3 has Nb = 7.18-29.87 ppm, Nb/La = 0.60-1.40, Nb/U = 5.0-37, Ce/Pb = 1.1-6.6, ε Nd (t) = +2.9 to +7.0, 187 Re/ 188 Os = 5.87-8.87 and ␥Os (t) = 178-772, geochemically resembling to the Pickle Nb-enriched basalt. Group 4 has strong LREE/HREE and HREE fractionation and high ε Nd (t) values (+2.3 to +5.6), and is characterized by similar element patterns to arc volcanic rocks. Serpentinites coeval to Group 4 show 187 Os/ 188 Os of 0.1143-0.1442 and ␥Os (t) of −7.8 to +0.1. Groups 1 and 2 are interpreted to originate from the N-MORB and E-MORB-like sources with the addition of an arc-like component, genetically linked to fore-and back-arc settings, respectively. Groups 3 and 4 show inputs of newly subduction-derived melt and fluid in the wedge source. These geochronological and geochemical signatures fingerprint the development of an earliest Neoproterozoic (∼970 Ma) arc-back-arc system along the Wuyi-Yunkai domain of the Cathaysia Block. Regional relationships indicate that the Wuyi-Yunkai arc-back-arc system was one of a series of separate convergent margin settings, which included the Shuangxiwu (∼970-880 Ma) and Jiangnan (∼870-820 Ma) systems that developed in the SCB. The formation and closure of these arc-back-arc systems resulted in the northwestwardly episodic amalgamation of various pieces of the Yangtze and Cathaysia to finally form the SCB. These signatures require the SCB to occupy an exterior accretionary orogen along the periphery of Rodinia during 990-820 Ma, rather than to have formed through Mesoproterozoic Sibao orogenesis within the interior of Rodinia.

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Assembly, configuration, and break-up history of Rodinia: A synthesis

Cited by 2,951 publications

References 293 publications

Basalts and picrites from a plume-type ophiolite in the South Qilian Accretionary Belt, Qilian Orogen: Accretion of a Cambrian Oceanic Plateau?

Basalts and picrites from a plume-type ophiolite in the South Qilian Accretionary Belt, Qilian Orogen: Accretion of a Cambrian Oceanic Plateau?

Dynamics of a Snowball Earth ocean

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

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