Earliest Neoproterozoic (ca. 1.0Ga) arc–back-arc basin nature along the northern Yunkai Domain of the Cathaysia Block: Geochronological and geochemical evidence from the metabasite

Zhang, Aimei; Wang, Yuejun; Wu, Fan; Zhang, Yuzhi; Yang, Joe

doi:10.1016/j.precamres.2012.08.003

Cited by 141 publications

(62 citation statements)

References 144 publications

(230 reference statements)

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“…These ages are similar to those of two metabasites from the northern Yunkai domain (Zhang et al, 2012a), which yielded the U-Pb zircon ages of 997 ± 21 Ma and 978 ± 19 Ma. The earliest Neoproterozoic zircons from these samples have ε Hf (t) values of +4.5 to +15.3, Hf model ages of 0.92-1.42 Ga (Fig.…”

Section: Age Of the Mafic Igneous Rockssupporting

confidence: 75%

“…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: 87%

“…Recent geochronological data have shown that the Neoproterozoic and even Paleozoic units are additionally presented within the previously mapped basement succession (e.g., Li et al, 1998;Wang et al, 2007cWang et al, , 2010bWang et al, , 2011bWang et al, , 2012cWan et al, 2007Wan et al, , 2010Yu et al, 2009Yu et al, , 2010Li et al, 2010aLi et al, ,c, 2011. Within the Cathaysia basement, there are small amounts of mafic and ultramafic rocks (e.g., amphibolite, metagabbro, metadiabase, metabasite, peridotite and pyroxenite), which occur mainly as lens, pods and fragments (e.g., Fujian BGMR, 1985;Guangxi BGMR, 1985;Guangdong BGMR, 1988;Zhejiang BGMR, 1989;Zhang et al, 2012a). These rocks have previously been considered to either part of the Paleoproterozoic (∼1.8 Ga) Cathaysia basement (e.g., Shui, 1988;Li et al, 1998Li et al, , 1999a or the Neoproterozoic (even early Mesozoic) ophiolitic mélange (e.g., Li, 1993;Guangdong BGMR, 1988;Peng et al, 1999Peng et al, , 2006Qin et al, 2007).…”

Section: Geological Background and Petrologymentioning

confidence: 99%

“…Major oxides, trace element contents and Nd-Os isotopic ratios were measured at the GIG, CAS and details of the analytical methods are given in Supplementary Data File 1. Analytical results for the samples are listed in Tables 1 and 2, which also includes data for additional samples published in Li et al (1999a,b), Qin et al (2005Qin et al ( , 2007 and Zhang et al (2012a).…”

Section: Geochemical Characteristics and Petrogenesismentioning

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

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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

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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: Age Of the Mafic Igneous Rockssupporting

confidence: 75%

Section: Neoproterozoic Northwesterly Episodic Amalgamation Along Thementioning

confidence: 87%

Section: Geological Background and Petrologymentioning

confidence: 99%

Section: Geochemical Characteristics and Petrogenesismentioning

confidence: 99%

Section: Neoproterozoic Northwesterly Episodic Amalgamation Along Theunclassified

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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

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121

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Late Paleozoic to Early Mesozoic provenance record of Paleo‐Pacific subduction beneath South China

Cawood

et al. 2015

Tectonics

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Northeast trending Yong'an Basin, southeast South China Craton, preserves a Permian-Jurassic, marine to continental, siliciclastic-dominated, retroarc foreland basin succession. Modal and detrital zircon data, along with published paleocurrent data, sedimentary facies, and euhedral to subhedral detrital zircon shapes, indicate derivation from multicomponent, nearby sources with input from both the interior of the craton to the northwest and from an inferred arc accretionary complex to the southeast. The detrital zircon U-Pb age spectra range in age from Archean to early Mesozoic, with major age groups at 2000-1700 Ma, 1200-900 Ma, 400-340 Ma, and 300-240 Ma. In addition, Early Jurassic strata include zircon detritus with ages of 200-170 Ma. Regional geological relations suggest that Precambrian and Early Paleozoic detritus was derived from the inland Wuyi Mountain region and Yunkai Massif of the South China Craton. Sources for Middle Paleozoic to early Mesozoic detrital zircons include input from beyond the currently exposed China mainland. Paleogeographic reconstruction in East Asia suggests derivation from an active convergent plate margin along the southeastern rim of the craton that incorporated part of Southwest Japan and is related to the subduction of the Paleo-Pacific Ocean. Integration of the geologic and provenance records of the Yong'an Basin with the time equivalent Yongjiang and Shiwandashan basins that lie to the southwest and south, respectively, provides an integrated record of the subduction of the Paleo-Pacific Ocean along the southeast margin of the South China Craton and termination of subduction of the Paleo-Tethys beneath its southwest margin in Permo-Triassic.

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Zircon U‐Pb geochronology and geochemistry of the metabasite and gabbro: Implications for the Neoproterozoic and Paleozoic tectonic settings of the Qinzhou Bay‐Hangzhou Bay suture zone, South China

Zheng

Zhou

et al. 2017

Geological Journal

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The Qinzhou Bay‐Hangzhou Bay Suture Zone (QHSZ) lies between the northwestern Yangtze Block and the southeastern Cathaysia Block in South China. An integrated zircon U‐Pb age, whole‐rock and mineral geochemical analyses have been enabled for understanding the Neoproterozoic and early Paleozoic geological evolution of the QHSZ. Zircon U‐Pb dating reveals that the Guizi metabasite and Zhuya gabbro were formed at 948 ± 11 Ma and 450.8 ± 2.9 Ma, respectively. The Guizi metabasites are characterized by Nb enrichments (8.18–16.11 ppm) with high Nb/La (0.76–0.98) and Nb/U (17.86–25.65) ratios. The samples are also LREE/HREE ([La/Yb]N = 2.66–3.29) and LILEs (Rb, Th, U and Pb) enriched with weakly depleted HFSEs (Nb, P and Ti), resembling the Nb‐enriched basalts. These geochemical signatures were likely to be originated from a newly subducted slab. Elemental contrasts illustrate that the Guizi metabasites are geochemically consistent with the Neoproterozoic Nb‐enriched basalts along the Wuyi‐Yunkai Domain, South China. Age and elemental characteristics of the Guizi samples suggest an earliest Neoproterozoic subduction within the QHSZ. The Zhuya gabbro samples have high contents of MgO (11.23–14.48%), Cr (520.8–782.7 ppm) and Ni (126.1–203.7 ppm), (La/Yb)N = 1.89–2.41, Eu/Eu* = 0.84–0.90, positive LILEs (Rb, Th, Sr and Pb) anomalies and negative HFSEs (Nb, P and Ti) anomalies. Clinopyroxene geochemical data show a significant arc cumulates trend. They were considered to be derived from an E‐MORB‐like source modified by subduction‐related fluids. Geochemical modelling indicates that a mixture of the Neoproterozoic mafic magma and SCB sediments (20–40%) can match the elemental and Sm‐Nd isotopic compositions of the Zhuya gabbros, which suggests the involvement of Neoproterozoic subduction‐modified mantle. Combined with regional geological and geochemical data, it is concluded that the Yangtze and Cathaysia blocks were likely sutured along the QHSZ forming an earliest Neoproterozoic arc‐back‐arc system, and the early Paleozoic mafic rocks are dominantly remelting products of the Neoproterozoic subduction modified mantle.

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Earliest Neoproterozoic (ca. 1.0Ga) arc–back-arc basin nature along the northern Yunkai Domain of the Cathaysia Block: Geochronological and geochemical evidence from the metabasite

Cited by 141 publications

References 144 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

Late Paleozoic to Early Mesozoic provenance record of Paleo‐Pacific subduction beneath South China

Zircon U‐Pb geochronology and geochemistry of the metabasite and gabbro: Implications for the Neoproterozoic and Paleozoic tectonic settings of the Qinzhou Bay‐Hangzhou Bay suture zone, South China

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