Geochronology and geochemistry of a suite of mafic rocks in Chencai area, South China: Implications for petrogenesis and tectonic setting

Zhao, Lei; Zhai, Mingguo; Zhou, Xiwen; Santosh, M.; Ma, Xudong

doi:10.1016/j.lithos.2015.09.004

Cited by 43 publications

(39 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Orogenesis resulted in extensive metamorphism and deformation of pre-Devonian rocks along with granite intrusions and emplacement of minor basalts (Li et al, 2010;Shu et al, 2015;Wang et al, 2012e;Wang et al, 2013c;Wang et al, 2010c;Yao et al, 2012;Zhao et al, 2015). Metamorphism was largely at greenschist facies, but locally reached amphibolite to granulite facies (Yu et al, 2005).…”

Section: Accepted M M a N U mentioning

confidence: 99%

Reconstructing South China in Phanerozoic and Precambrian supercontinents

Cawood

Zhao

Yao

et al. 2018

Earth-Science Reviews

387

178

View full text Add to dashboard Cite

The history of the South China Craton and the constituent Yangtze and Cathaysia blocks are directly linked to Earth's Phanerozoic and Precambrian record of supercontinent assembly and dispersal. Exposed Archean rocks are limited to isolated fragments in the Yangtze Block that preserve a record of Meso-to Neo-Archean magmatism, sedimentation and metamorphism associated with a period of global craton formation and stabilization that corresponds with the assembly of the Kenor supercontinent/supercraton.

show abstract

Section: Accepted M M a N U mentioning

confidence: 99%

Reconstructing South China in Phanerozoic and Precambrian supercontinents

Cawood

Zhao

Yao

et al. 2018

Earth-Science Reviews

387

178

View full text Add to dashboard Cite

show abstract

“…ε Hf (t) values vs. age, t = 440 Ma (a) and histogram of T DM1 from the early Paleozoic mafic rocks (b; data are from Wang et al, ; Yao et al, ; Zhang et al, ; Zhang et al, ; Zhao et al, )…”

Section: Discussionmentioning

confidence: 99%

“…440–400 Ma (Charvet et al, ; Li et al, ). Latest study has investigated a garnet‐bearing amphibolite in Zhejiang province with zircon Hf model age peaking at 490 Ma, showing an earliest Paleozoic depleted mantle derivation (Zhao et al, ). In addition, based on the investigations on the metamorphosed Chencai and Mayuan groups (containing kyanite), some workers hypothesized that the early Paleozoic subduction had occurred between the present‐day Cathaysia Block and an unknown continent (Chen, Tong, Zhang, Zhu, & Li, ; Zhang et al, ; Zhao & Cawood, , ; Zhao, Sun, & He, ).…”

Section: Discussionmentioning

confidence: 99%

“…In recent years, some early Paleozoic mafic‐medium‐felsic rocks with subduction features have been identified in Zhejiang‐Fujian‐Guangxi‐Guangdong region, and they hypothesized that the early Paleozoic subduction had occurred within the QHSZ (Chen, Zeng, Yang, & Wu, ; Peng, Liu, Lin, Wu, & Han, , ; Qin et al, ; Xu, Chen, Xia, Li, & He, ; Yang, Chen, Wu, & Dong, ). The coeval mafic rocks are commonly characterized by enriched Nd‐Hf isotopic compositions (Wang et al, ; Wang et al, ; Yao et al, ; Zhang et al, ; Zhang et al, ; Zhao et al, ; Zhong et al, ). Although they have LILEs enrichments and HFSEs depletions (showing subduction signatures), it is unlikely originated from the early Paleozoic subduction as the presence of zircon Hf model age peak at ca.…”

Section: Discussionmentioning

confidence: 99%

“…The majority of the granites were formed during 460–400 Ma (peak at 436 Ma; Wang, Zhang, Fan, Zhang, & Zhang, ). Coeval mafic rocks were considered absent until recent years, with their ages ranging from 442 to 420 Ma (Wang et al, ; Yao et al, ; Zhang et al, ; Zhang, Santosh, Zhu, Chen, & Huang, ; Zhao, Zhai, Zhou, Santosh, & Ma, ).…”

Section: Regional Geology and Petrologymentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

Qin

et al. 2018

Geological Journal

View full text Add to dashboard Cite

The Early Paleozoic orogeny in South China has remained controversial in the long run with debate over intracontinental orogeny versus plate subduction. Limited studies have focused on the Early Paleozoic volcanic rocks in South China, which is crucial for us to understand the tectonic evolution of the South China Block. The Dabaoshan Fe–Cu–Pb–Zn–Mo–W orefield, one of the largest polymetallic deposits in South China, is hosted by Paleozoic volcanic‐sedimentary rocks and Mesozoic granitic porphyry. In this study, zircon U–Pb dating yielded ages of 439.4 ± 2.7 Ma, 439.3 ± 3.2 Ma, and 442.0 ± 2.2 Ma for the Dabaoshan dacite. These ages are all in good agreement within errors and indicate that the dacite formed during the early Silurian (ca. 440 Ma). The dacites are slightly peraluminous, calc‐alkaline with relatively high K2O + Na2O, FeOt, TiO2, CaO/Na2O ratios, and small negative Eu anomalies. They show enrichment in LILEs and LREE and depletion in Ba, Nb, Sr, P, and Ti. It has high initial 87Sr/86Sr values (0.70983–0.71140) and negative εNd(t) values ranging from −7.6 to −10 with T2DM ages of 1.80–1.99 Ga, εHf(t) values from −4.95 to −15.48 with T2DM ages of 1.72 Ga to 2.38 Ga. The overlapped Nd–Hf two‐stage model ages range from 1.89 Ga to 1.99 Ga, which indicates that the Dabaoshan dacite originated from a Paleoproterozoic source. Combining these geochemical and in situ zircon Hf isotopic data, we propose that the Dabaoshan dacite may have originated from the partial melting of mixed source of Paleoproterozoic metasedimentary and metaigneous rocks as a result of underplating of mafic magma during the post‐orogenic collapse and extension followed by lithospheric thining and asthenospheric mantle upwelling in an intraplate setting. Based on field observation and the geochronology results, we propose that the stratiform Cu–Pb–Zn mineralization may be related with the early Silurian volcanic rocks.

show abstract

Geochronology and geochemistry of a suite of mafic rocks in Chencai area, South China: Implications for petrogenesis and tectonic setting

Cited by 43 publications

References 74 publications

Reconstructing South China in Phanerozoic and Precambrian supercontinents

Reconstructing South China in Phanerozoic and Precambrian supercontinents

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

Geochronology and geochemistry of Early Silurian felsic volcanic rocks in the Dabaoshan ore district, South China: Implications for the petrogenesis and geodynamic setting

Contact Info

Product

Resources

About