Geochronology of Neoproterozoic mafic rocks and sandstones from northeastern Guizhou, South China: Coeval arc magmatism and sedimentation

Zhou, Jingfeng; Wang, Xiao Lei; Qiu, Junlan

doi:10.1016/j.precamres.2008.11.002

Cited by 256 publications

(128 citation statements)

References 52 publications

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“…The lower intercept age (ca. 800 Ma) may represent the time when the rock suffered a later thermal event, which also is consistent with the time of Neoproterozoic tectonothermal events in the Yangtze block, or even over the entire South China area [54][55][56][57][58][59][60][61][62][63].…”

Section: Zircon U-pb Age and Characteristics Of Rare Earth Element Comentioning

confidence: 79%

Discovery of Paleoproterozoic rapakivi granite on the northern margin of the Yangtze block and its geological significance

Zhang

Wang

et al. 2011

Chin. Sci. Bull.

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The Huashanguan rapakivi pluton in Zhongxiang, Hubei Province, China, is the first discovered Proterozoic rapakivi pluton in the Yangtze block. Based on field and petrographical observations, a typical rapakivi texture was found in the northern portion of the Huashanguan granitic pluton. Almost all the K-feldspar phenocrysts were round to oval in shape and most had plagioclase coatings known as rapakivi phenocrysts. Alkali feldspars and quartz had two or more generations. Petrochemically, the Huashanguan rapakivi granites were characterized as having high values of Si, K, Fe, Th, U, La, Ga, Ce, Sm and LREE, low values of Ca, Mg, Sr, Nb, Y and HREE, and a negative Eu anomaly. These geochemical characteristics of the Huashanguan granites were concordant with typical rapakivi granites, and had an affinity to A-type granites. LA-ICP-MS U-Pb zircon dating also was conducted. The dating yielded a 207 Pb/ 206 Pb weighted mean age of 1851±18 Ma (MSWD =1.2), which represents the age of the pluton emplacement. The age of 803±170 Ma at the lower intercept in the concordia diagram corresponds to the age of a later deformation event which affected the pluton, and suggests that the Huashanguan pluton was influenced by Neoproterozoic thermo-tectonic events after its formation. The discovery of Paleoproterozoic Huashanguan rapakivi granites indicates continental rifting or a post-orogenic extensional event that took place in the Paleoproterozoic in the Yangtze block. These events may be related to the breakup of the Paleoproterozoic Columbia supercontinent.

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Section: Zircon U-pb Age and Characteristics Of Rare Earth Element Comentioning

confidence: 79%

Discovery of Paleoproterozoic rapakivi granite on the northern margin of the Yangtze block and its geological significance

Zhang

Wang

et al. 2011

Chin. Sci. Bull.

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“…Inset (b) shows the age-spectra of detrital zircons for the Neoproterozoic sedimentary rocks from the Yunkai-Nanling and Jiangnan domains. Data in (b) from Wang et al (2007bWang et al ( , 2008aWang et al ( , 2010a, Zhang et al (2012a), Yu et al (2007Yu et al ( , 2008Yu et al ( , 2010, Wan et al (2007Wan et al ( , 2010, Li et al (2011);Zhao et al (2011) and Zhou et al (2009). An overall northwestward propagation of orogenic assembly of units is supported by the age-spectra of detrital zircons for the Neoproterozoic sedimentary rocks and their derivation from the southeast (inset (b) of Fig. 16, e.g., Wang et al, 2008aWang et al, , 2010aYu et al, 2005Yu et al, , 2010Zhang et al, 2012a).…”

Section: Neoproterozoic Northwesterly Episodic Amalgamation Along Thementioning

confidence: 88%

“…The crystallization ages of the igneous rocks along the Jiangnan domain are commonly younger than 850 Ma with a cluster of ∼850-820 Ma ( Fig. 16; e.g., Li, 1999;Zhou et al, 2004;Zhong et al, 2005;Wu et al, 2006;Wang et al, 2007bWang et al, , 2008aWang et al, , 2011aZheng et al, 2007Zheng et al, , 2008Zhou et al, 2009;Ma et al, 2009;Xue et al, 2010;Dong et al, 2010;Wang et al, 2010a;Zhao et al, 2011;Zhang et al, 2012cZhang et al, , 2013. These data suggest the backarc basin along the Jiangnan domain developed from ∼850 and its cessation of subduction and final closure at ∼830-820 Ma by the Jinningian Orogen ( Fig.…”

Section: Neoproterozoic Northwesterly Episodic Amalgamation Along Thementioning

confidence: 99%

“…16). Li et al, 1994;12) Gao et al, 2009;13) 14) Ye et al, 2007;15) Chen et al, 2009a;17) Wang et al, 2012a;18) Zhou et al, 2004Zhou et al, , 200919) Zhang et al, 2009;20) Li et al, 2009;21) Ding et al, 2008;22) Zhang et al, 2012c;23) Wang et al, 2008b;24) Shu et al, 2006;25) Li et al, 2010a;26) Hu and Liu, 2002;27) Qin et al, 2006;28) Zhang et al, 1998;29) Zhang et al, 2012a;30) Shu et al, 2008;31) Liu et al, 2001; 32) Shu et al, 2011;33) Li et al, 2005;34) Li et al, 2002;35) Zhang et al, 2011b and 36) this study. Inset (a) shows the early Neoproterozoic tectonic subdivision in the eastern South China Block and associated orogenism.…”

Section: Neoproterozoic Northwesterly Episodic Amalgamation Along Theunclassified

“…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). Furthermore, additional age-data suggest that final assembly along the Jiangnan domain did not occur until at least ∼830 Ma (e.g., Wang et al, 2006Wang et al, , 2007bWang et al, , 2008bWang et al, ,c, 2011aWu et al, 2006;Zhou et al, 2004Zhou et al, , 2009Zheng et al, 2007Zheng et al, , 2008Zhao et al, 2011;Zhang et al, 2011cZhang et al, , 2012cZhao and Guo, 2012). As a result, the SCB has either been placed on the margin of Rodinia or external to the supercontinent (e.g., Zhao and Cawood, 1999;Torsvik et al, 2001;Yang et al, 2004).…”

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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Temporal and spatial patterns of sediment routing across the southeast margin of the Tibetan Plateau: Insights from detrital zircon

et al. 2016

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The Cenozoic deposits of the Tibetan Plateau's southeastern margin are often cited as part of a continental‐scale river system connecting the Paleo‐Yangtze River with the Paleo‐Red River. Confirming the purported connection and any subsequent drainage reorganization has garnered significant attention and varied proposed ages for reorganization. This study presents detrital zircon U‐Pb ages and paleocurrents in Eocene to Pleistocene sedimentary basin deposits distributed over a broad area of the southeast Tibetan Plateau margin within the area of proposed paleoriver connectivity. When combined with previously published studies, our U‐Pb ages allow examination of the temporal and spatial distributions of provenance throughout the Cenozoic. We identify six key age components of the detrital U‐Pb age distributions and use these to examine the patterns of sediment provenance for different Cenozoic epochs. Detailed analysis of these components shows that provenance for both onshore and offshore deposits is best described by local bedrock sources and provides little to no evidence of regional changes in provenance. This suggests that a stable fluvial system similar to the modern drainage network has existed since the Eocene with no evidence for major provenance‐altering river capture. Paleoflow measurements taken throughout the SE margin further corroborate the results of detrital zircon provenance. The combination of U‐Pb age components and paleocurrent directions does not support a Cenozoic connection between the Paleo‐Yangtze and Paleo‐Red Rivers.

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Geochronology of Neoproterozoic mafic rocks and sandstones from northeastern Guizhou, South China: Coeval arc magmatism and sedimentation

Cited by 256 publications

References 52 publications

Discovery of Paleoproterozoic rapakivi granite on the northern margin of the Yangtze block and its geological significance

Discovery of Paleoproterozoic rapakivi granite on the northern margin of the Yangtze block and its geological significance

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

Temporal and spatial patterns of sediment routing across the southeast margin of the Tibetan Plateau: Insights from detrital zircon

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