South China in Rodinia: Part of the missing link between Australia–East Antarctica and Laurentia?

Li, Zheng‐Xiang; Zhang, Linghua; Powell, C. McA.

doi:10.1130/0091-7613(1995)023<0407:scirpo>2.3.co;2

Cited by 704 publications

(247 citation statements)

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“…Our geochemical data are also in contrast to that expected for carbonatite contamination of a plume-related source, which would share highly fractionated Zr/Hf ratios (up to 100) and extremely high LREE contents ( 100 ppm) (e.g., Woodhead et al, 1993;Hastie et al, 2011). Most importantly, there is no geological observation supporting the development of an earliest Neoproterozoic plume in the eastern SCB (e.g., Li et al, 1995Li et al, , 2002Yu et al, 2009;Shu et al, 2011).…”

Section: Group 3: Nb-enriched Basalt From a Newly Metasomatised Wedgecontrasting

confidence: 48%

“…The SCB has been argued to lie within or external to the Rodinia supercontinent in the latest Mesoproterozoic to earliest Neoproterozoic (e.g., Li et al, 1995Li et al, , 2002Zhao and Cawood, 1999;Yang et al, 2004;Yu et al, 2008;Zhao et al, 2011). In the model proposed by others (1995, 2002), the proposed Sibao orogen is considered to range in age from 1.3 Ga to 1.0 Ga and constitutes a collisional orogen equivalent to the Grenville Orogen and is associated with Rodinia assembly.…”

Section: An Exterior Accretionary Orogen For the Scb Along The Marginmentioning

confidence: 99%

“…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%

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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

226

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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Section: Group 3: Nb-enriched Basalt From a Newly Metasomatised Wedgecontrasting

confidence: 48%

Section: An Exterior Accretionary Orogen For the Scb Along The Marginmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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

226

121

View full text Add to dashboard Cite

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“…South China, including the Yangtze and Cathaysia blocks, was presumably part of the Precambrian supercontinent-Rodinia (Li et al, 1995;Zhou et al, 2002). The Yangtze Block is separated from the North China Craton by the Qinling-Dabie orogenic belt to the north and is bounded on the west and south by the Tibetan Plateau and Indochina Block, respectively.…”

Section: Possible Sediment Sourcesmentioning

confidence: 99%

Zircon U-Pb geochronology and heavy mineral composition constraints on the provenance of the middle Miocene deep-water reservoir sedimentary rocks in the Yinggehai-Song Hong Basin, South China Sea

Liang

Foster

Xie

et al. 2016

Marine and Petroleum Geology

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“…Second, the extension of the dyke swarm into western Canada means that other continents which may have lain alongside western Laurentia in Middle Proterozoic or later times, and were subsequently rifted away, may contain distal members of the Mackenzie swarm. Candidates for formerly attached continents include Australia (Bell and Jefferson, 1987;Moores, 1991;Ross et al, 1992), Siberia (Sears and Price, 2000), and South China (Li et al, 1995). If Mackenzie-aged dykes were to be identified in one or more of these regions, the orientation, composition, and exact age of the dykes would serve as valuable tools in resolving the controversy over paleocontinental reconstructions and understanding magmatic processes of giant dyke swarms.…”

Section: Regional Significancementioning

confidence: 99%

The Bear River dykes (1265–1269 Ma): westward continuation of the Mackenzie dyke swarm into Yukon, Canada

Schwab

Thorkelson

Mortensen

et al. 2004

Precambrian Research

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The 1.27 Ga Mackenzie dyke swarm, the largest on Earth, radiates from a point in the western Canadian Arctic and extends across much of the Canadian Shield. Possible western extensions of the swarm are largely obscured by younger sedimentary cover. Paleoproterozoic inliers in northern Yukon host the Bear River dykes (BRD), herein dated by U-Pb baddeleyite and zircon methods at 1268.5 ± 1.5 Ma and 1264.6 ± 1.2 Ma. The BRD share similar geochemical and Nd-isotopic characteristics with the Mackenzie dykes and the coeval Coppermine River basalts, and are regarded as products of the same plume. Hydrothermal activity at ∼1270 Ma in breccia of the Nor mineral occurrence, northwest of the BRD, was probably generated by BRD at depth. The BRD generally strike northwest, approximately 90 • to the orientation predicted by the radiating dyke model. This difference may be explained by an anomalous local stress field at the time of BRD emplacement, or reorientation of BRD during subsequent events of Cordilleran deformation. Using the Nor mineral occurrence as the westernmost locale of Mackenzie dyking, and assuming a model of uniform dyke radiation, the arc of the Mackenzie swarm is at least 50 • greater than previously recognized, bringing the total arc of dyke radiation to >150 • .

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South China in Rodinia: Part of the missing link between Australia–East Antarctica and Laurentia?

Cited by 704 publications

References 0 publications

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

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

Zircon U-Pb geochronology and heavy mineral composition constraints on the provenance of the middle Miocene deep-water reservoir sedimentary rocks in the Yinggehai-Song Hong Basin, South China Sea

The Bear River dykes (1265–1269 Ma): westward continuation of the Mackenzie dyke swarm into Yukon, Canada

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