Age and Geochemical Characteristics of Bimodal Magmatism in the Neoproterozoic Grandfather Mountain Rift Basin

Fetter, Allen H.; Goldberg, Steven A.

doi:10.1086/629749

Cited by 58 publications

(23 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Data sources are as in Fig. 7. blocks from China is comparable with the synchronous rift-related volcanism on other Rodinian continents including Australia, Laurentia, South Korea, India and the Seychelles (e.g., Parrish and Scammell, 1988;Heaman et al, 1992;Su et al, 1994;Zhao et al, 1994;Fetter and Goldberg, 1995;Park et al, 1995;Lee et al, 1998Lee et al, , 2003Bhushan, 2000;Preiss, 2000;Frimmel et al, 2001;Ashwal et al, 2002;Li et al, 1999bLi et al, , 2002aLi et al, ,b,c, 2003bLi et al, , 2005aLi et al, ,b,c, 2006Li et al, , 2008aLi et al, ,b,c, 2009bLing et al, 2003;Shellnutt et al, 2004;Song et al, 2010;Wang et al, 2007Wang et al, , 2008Wang et al, 2010;Xu et al, 2005;Xia et al, 1996aXia et al, ,b, 2002Xia et al, , 2007aXia et al, ,b,c, 2008aXia et al, , 2009aZhang et al, 1999a,b;Zhang et al, 2010). This global intraplate volcanism has commonly been attributed to mantle plumes or a mantle superplume (e.g., Heaman et al, 1992;Zhao et al, 1994;Park et al, 1995;Li et al, 1999bLi et al, , 2003bLi et al, , 2005a…”

Section: Implications For Rifting and Break-up Of Rodinia Supercontinentmentioning

confidence: 59%

“…The rift-related volcanic successions of the first stage in Qaidam and South China are also found in Australia (Zhao et al, 1994;Wingate et al, 1998), India (Radhakrishna and Mathew, 1996), Kalahari (Frimmel et al, 2001), ArabianeNubian terranes (Stein and Goldstein, 1996;Teklay et al, 2002) and Laurentia (Su et al, 1994;Aleinikoff et al, 1995;Fetter and Goldberg, 1995). Li et al (2008c) suggested that by ca.…”

Section: Implications For Rifting and Break-up Of Rodinia Supercontinentmentioning

confidence: 92%

See 1 more Smart Citation

Mid–Late Neoproterozoic rift-related volcanic rocks in China: Geological records of rifting and break-up of Rodinia

Linqi

Zuchun

et al. 2012

Geoscience Frontiers

View full text Add to dashboard Cite

Early Cambrian and MideLate Neoproterozoic volcanic rocks in China are widespread on several Precambrian continental blocks, which had aggregated to form part of the Rodinia supercontinent by ca. 900 Ma. On the basis of petrogeochemical data, the basic lavas can be classified into two major magma types: HT (Ti/Y > 500) and LT (Ti/Y < 500) that can be further divided into HT1 (Nb/La > 0.85) and HT2 (Nb/La 0.85), and LT1 (Nb/La > 0.85) and LT2 (Nb/La 0.85) subtypes, respectively. The geochemical variation of the HT2 and LT2 lavas can be accounted for by lithospheric contamination of asthenosphere-(or plume-) derived magmas, whereas the parental magmas of the HT1 and LT1 lavas did not undergo, during their ascent, pronounced lithospheric contamination. These volcanics exhibit at least three characteristics: (1) most have a compositional bimodality; (2) they were formed in an intracontinental rift setting; and (3) they are genetically linked with mantle plumes or a mantle surperplume. This rift-related volcanism at end of the Mide Neoproterozoic and Early Cambrian coincided temporally with the separation between Australiae East Antarctica, South China and Laurentia and between Australia and Tarim, respectively.

show abstract

Section: Implications For Rifting and Break-up Of Rodinia Supercontinentmentioning

confidence: 59%

Section: Implications For Rifting and Break-up Of Rodinia Supercontinentmentioning

confidence: 92%

Mid–Late Neoproterozoic rift-related volcanic rocks in China: Geological records of rifting and break-up of Rodinia

Linqi

Zuchun

et al. 2012

Geoscience Frontiers

View full text Add to dashboard Cite

show abstract

“…The Grandfather Mountain Formation is a structurally isolated, thick succession of clastic sedimentary rocks and volcanic flows (Fig. 1), the stratigraphically highest of which has an age of 742 ± 2 Ma (Fetter and Goldberg 1995). Nearby, temporally related plutons range in age from ~765 to 728 Ma ( Fig.…”

Section: Iapetan Rifted Continental Marginmentioning

confidence: 99%

“…Nearby, temporally related plutons range in age from ~765 to 728 Ma ( Fig. 1) (Su et al 1994;Fetter and Goldberg 1995;Ownby et al 2004). The separate, distinctive, thick synrift accumulations suggest rotated halfgrabens along a lower-plate rift margin, which ends northeastward at the Virginia-Tennessee transform fault (Thomas 1993).…”

Section: Iapetan Rifted Continental Marginmentioning

confidence: 99%

A Mechanism for Tectonic Inheritance at Transform Faults of the Iapetan Margin of Laurentia

Thomas

2014

View full text Add to dashboard Cite

Transform faults along the Iapetan rifted continental margin of Laurentia offset the continental rift and/or bound domains of oppositely dipping low-angle detachments. Rift-parallel and transform-parallel intracratonic fault systems extend into continental crust inboard from the rifted margin. Ages of synrift igneous rocks, ranging from 765 to 530 Ma, document non-systematic diachroneity of rifting along the Iapetan margin. Synrift sedimentary accumulations show abrupt variations in thickness across transform faults, and some concentrations of synrift igneous rocks are distributed along transform faults and transform-parallel intracratonic fault systems. The greatest thicknesses of Cambrian–Ordovician passive-margin shelf-carbonate deposits are along transform margins and in continental-margin basins along transform faults, as well as along transform-parallel intracratonic fault systems, indicating anomalously great post-rift thermal subsidence along transform faults. Along the Ordovician–Permian Appalachian-Ouachita orogenic belt, a diachronous array of synorogenic clastic wedges fills foreland basins, recording tectonic-load-driven flexural subsidence of the lithosphere. The greatest thicknesses of synorogenic clastic wedges of all ages are consistently in foreland basins along transform margins and inboard from intersections of transform faults with the rifted margin, indicating systematically weaker lithosphere along transform faults. The distinctive and pervasive properties and behaviour of the lithosphere along transform faults in successive tectonic settings suggest fundamental controls on tectonic inheritance at transform faults. Recent models for continental rifting incorporate ductile extension of the mantle lithosphere beneath brittle extension of the crust; the domain of ductile extension of the mantle lithosphere may reach significantly inboard from the rifted margin of the brittle crust, accounting for rift-parallel extensional faults in the crust inboard from the rifted margin. A transform offset of a rift in brittle crust requires a similar offset in ductile extension of the mantle lithosphere, leading to differential ductile flow on opposite sides of the transform and imparting a transform-parallel distributed-shear fabric. Transform-parallel distributed shear in the mantle lithosphere provides a mechanism for brittle transform-parallel fault systems in the continental crust. Studies of seismic anisotropy show fast directions parallel with transform faults, indicating systematic orientation of crystals through transform-parallel distributed shear in the mantle lithosphere.SOMMAIRELes failles transformantes le long de la marge continentale divergente japétienne de la Laurentie décalent le rift continental et/ou les domaines accrétés en des décollements à pendages opposés faibles. Des systèmes de failles intracratoniques parallèles au rift, et parallèles à la transformation, pénètrent vers l’intérieur de la croûte continentale à partir de la marge de rift. Les âges des roches ignées syn-rift, entre 765 Ma et 530 Ma, témoignent d’une activité de rifting diachronique non-systématique le long de la marge japétienne. Des empilements sédimentaires syn-rifts montrent des variations abruptes d’épaisseur d’une faille transformante à l’autre, et des concentrations de roches ignées syn-rifts se répartissent le long des systèmes de failles transformantes et de failles intracratoniques parallèles. Les accumulations les plus épaisses de carbonates de plateforme de marge continentale passive se trouvent le long des marges de cisaillement et dans les bassins de marge continentale le long de failles transformantes, de même qu’au long des systèmes de failles intracratoniques parallèles, évoquant une subsidence anormalement forte le long des failles transformantes. Le long de la bande orogénique ordovicienne-permienne Appalaches-Ouachita, une gamme diachronique de prismes clastiques synorogéniques remplit les bassins d’avant-pays, attestant d’une subsidence par flexure lithosphérique d’origine tectonique. Les plus grandes épaisseurs de prismes clastiques synorogéniques à tous les âges sont toujours situées dans les bassins d’avant-pays le long des marges transformantes, et vers l’intérieur, à partir des intersections des failles transformantes avec la marge de rift, indiquant une lithosphère systématiquement plus fragile le long des failles transformantes. Les propriétés particulières et le comportement généralisés de la lithosphère le long des failles transformantes dans les contextes tectoniques successifs sont la marque de contrôles fondamentaux sur l'héritage tectonique des failles transformantes. Les modèles récents de rifting continental comportent une extension ductile de la lithosphère mantellique sous l’extension cassante de la croûte; le domaine d'extension ductile de la lithosphère mantellique peut s’étendre significativement vers l’intérieur de la marge de divergence de la croûte cassante, d’où les failles d'extension parallèle au rift, à l’intérieur de la croûte de la marge de divergence. Un décalage de transformation de rift de la croûte comporte un décalage du même genre de l’extension ductile de la lithosphère mantellique, ce qui implique un différentiel de flux ductile sur les bords opposés de la transformation, d’où cette fabrique d’extension parallèle à la transformation. L’extension parallèle à la transformation de la lithosphère mantellique fournit un mécanisme qui explique les systèmes de failles transformantes parallèles dans la croûte continentale. Les études de l’anisotropie sismique montre les grandes vitesses de propagation parallèles aux failles de transformations, ce qui indique une orientation systématique des cristaux induite par une extension répartie selon les cassures transformantes dans la lithosphère mantellique.

show abstract

“…Neoproterozoic magmatism is widespread in several continental fragments including Australia, Laurentia, South China, South Korea, India and Tarim (e.g., Powell et al, 1994;Heaman et al, 1992;Su et al, 1994;Zhao et al, 1994;Fetter and Goldberg, 1995;Park et al, 1995;Lee et al, 1998Lee et al, , 2003Li et al, 1999Li et al, , 2002aLi et al, ,b, 2005Li et al, , 2006Li et al, , 2008aBhushan, 2000;Preiss, 2000;Frimmel et al, 2001;Ashwal et al, 2002;Ling et al, 2003;Shellnutt et al, 2004;Xu et al, 2005;Rino et al, 2008;Stern, 2008;Condie et al, 2009;Oh et al, 2009;Zhang et al, 2006Zhang et al, , 2009bZheng et al, 2009;Dharma Rao et al, 2010;Just et al, 2011). Granitic magmatism during Neoproterozoic at ca.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

Late Neoproterozoic thermal events in the northern Lhasa terrane, south Tibet: Zircon chronology and tectonic implications

Dong

Zhang

Santosh

et al. 2011

Journal of Geodynamics

View full text Add to dashboard Cite

Age and Geochemical Characteristics of Bimodal Magmatism in the Neoproterozoic Grandfather Mountain Rift Basin

Cited by 58 publications

References 42 publications

Mid–Late Neoproterozoic rift-related volcanic rocks in China: Geological records of rifting and break-up of Rodinia

Mid–Late Neoproterozoic rift-related volcanic rocks in China: Geological records of rifting and break-up of Rodinia

A Mechanism for Tectonic Inheritance at Transform Faults of the Iapetan Margin of Laurentia

Late Neoproterozoic thermal events in the northern Lhasa terrane, south Tibet: Zircon chronology and tectonic implications

Contact Info

Product

Resources

About