Mid-Neoproterozoic diabase dykes from Xide in the western Yangtze Block, South China: New evidence for continental rifting related to the breakup of Rodinia supercontinent

Cui, Xin-Long; Jiang, Xinwei; Wang, Jian; Wang, Xuance; Jiang, Zhuo; Deng, Qi; Liao, Shiyong; Wu, Hao; Jiang, Zhuo-Fei; Wei, Ya-Nan

doi:10.1016/j.precamres.2015.07.017

Cited by 55 publications

(24 citation statements)

References 117 publications

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“…The Nb/La ratio is more or less the same (average= 0.9 ± 0.08) in all the amphibolite samples, but is lower and shows significant sample-tosample variation in case of dolerites (average= 0.7 ± 0.12). The higher and more or less uniform Nb/La ratios in amphibolites and analogous Nb/Ta ratio to OIB suggest derivation of its parental melt from asthenospheric mantle (Wang et al, 2014;Cui et al, 2015). However, the lower values and greater variation in Nb/La ratio and lower Nb/Ta ratios of dolerites indicate the source of these rocks to be SLM.…”

Section: Partial Melting Of Mantle Sourcementioning

confidence: 99%

Petrographic features as an effective indicator for the variation in strength of granites

Sajid

Coggan

Arif

et al. 2016

Engineering Geology

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The important textural features include average grain size of rock, grain boundary recrystallization, maximum grain size of major rock forming minerals, mean grain size of cleaved minerals, mineral exsolution and variation of grain size within a rock. The petrographic observations, however, are more effective to describe the strength variation of granites having analogous weathering grade as change in degree of weathering has a dominant effect on rock mechanics.

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Section: Partial Melting Of Mantle Sourcementioning

confidence: 99%

Petrographic features as an effective indicator for the variation in strength of granites

Sajid

Coggan

Arif

et al. 2016

Engineering Geology

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“…820~830 Ma along the Jiangnan orogenic belt, and the extensive development of magmatic and tectonic events is related to the assembly and breakup of the Rodinia supercontinent (Li, 1999a;Ernst et al, 2008;Zhang et al, 2013aZhang et al, , 2013bWang et al, 2015;Zhao, 2015;Deng et al, 2016b). Recently, many scholars have studied the Mesoproterozoic-Neoproterozoic magmatic rocks and sedimentary basins of the Yangtze Block and have had lively discussions about the reconstruction and recovery of the assembly and breakup process of the Rodinia supercontinent (Li et al, 2008a;Wang et al, 2013;Wang et al, 2014b;Cui et al, 2015;Wang et al, 2015;Zhao, 2015). Among all the discussions, the petrogenesis and tectonic setting of the magmatic rocks between 860 and 750 Ma are vigorously debated (Li, 1999a, Li et al, 2003bLi et al, 1999bLi et al, , 2008bWang and Li, 2003;Zhao et al, 2008;Deng et al, 2013;Zhang et al, 2013a, 2013b, 2014bLi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Early Neoproterozoic syncollisional S-type granites from the western Yangtze Block, South China: Implications for final closure of the back-arc basin

Li¹,

Wang²,

Cui³

et al. 2019

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Records of Neoproterozoic magmatic activity in the western margin of the Yangtze Block are widely distributed, although considerable debate remains regarding the petrogenesis and tectonic setting of this region. We performed zircon U-Pb geochronologic, zircon Hf isotope and whole-rock geochemical analyses on Jinkouhe granite (JKHG) samples from the western margin of the Yangtze Block. The zircon U-Pb dating results show that the age of the JKHG formation is 860±4 Ma (MSWD=0.23). The JKHG is classified as high-K calc-alkaline strongly peraluminous S-type granite, and the samples have positive zircon ε Hf (t) values of 3.95 to 5.77. Based on the zircon ε Hf (t) values and the geochemical characteristics, we conclude that the JKHG is sourced from the mixture of partial melts of metagraywackes and partial melts of juvenile crust. The geochemical analysis shows that the JKHG has the characteristics of syncollisional granitic magmatism. Integrating previous studies with the regional correlations among magma records in this contribution, we propose that the Shimian-Ebian region was a back-arc basin system along the western margin of the Yangtze Block ca. 1070~940 Ma and that the JKHG may be related to the final closure of the back-arc basin.

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“…Unfortunately, the samples for supporting both models are mainly from felsic rocks and intermediate rocks; few basic rocks are involved as a result of their rare occurrences in the SCB. [3,28,41,42]). The inset is a tectonic sketch of China showing the three Precambrian blocks (after [43]).…”

Section: Introductionmentioning

confidence: 99%

Dual Geochemical Characteristics for the Basic Intrusions in the Yangtze Block, South China: New Evidence for the Breakup of Rodinia

et al. 2018

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Neoproterozoic intraplate magmatic rocks are widespread in the Yangtze Block (YZB). The contrasting interpretations on their petrogenesis and tectonic evolution induce stimulating discussions on the coeval tectonic setting, including the two competing models of rift-related (R-model) and arc-related (A-model). Their main evidence is dominantly from felsic magmatic rocks. In contrast, the less evolved basic rocks are more suitable for tectonic setting discrimination. Here we study the Longtanqing basic intrusions (LTQ) that are exposed to the central part of the N-S trending Kangdian rift in the western YZB, by detailed geochemical and geochronological investigations. Zircon U-Pb dating of the two diabases from LTQ yield identical ages within error of 777 ± 17 Ma and 780 ± 5.3 Ma, respectively. LTQ rocks are characterized by low SiO 2 (49.83-50.71 wt %), high MgO (5.91-6.53 wt %), and Cr (140-150 ppm) contents, supporting the significant mantle affinity. They also display dual geochemical characteristics, including a series of features of continental within-plate basalts (WPB, Ti/V = 37.3-47.5, Zr/Y = 3.4-3.8, Ta/Hf = 0.19-0.23), and the typical signatures of island arc basalt (IAB), such as highly depleted in HFSE and HREE, and enriched in LREE and LILE. Most zircon ε Hf (t) values are positive (1.6-9.4) while the corresponding Hf depleted mantle model ages (T DM1) range from 1.0 Ga to 1.3 Ga. In combination with the occurrence of inherited zircons (991-1190 Ma), it is suggested that their sources are dominantly derived from the lithospheric mantle that was reconstructed in the late Mesoproterozoic. Thus, LTQ is mainly formed by partial melting of the enriched lithospheric mantle, and subsequently assimilated by a juvenile crust during upwelling. The melt compositions are controlled by different degrees of the crystal fractionation of the dominant clinopyroxene and plagioclase with minor amphibole under high f O 2 conditions. Combined with previous geochronological and geochemical data in the YZB, our new results support the theory that the R-model can be responsible for the petrogenesis of Neoproterozoic magmatic rocks in South China.

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Mid-Neoproterozoic diabase dykes from Xide in the western Yangtze Block, South China: New evidence for continental rifting related to the breakup of Rodinia supercontinent

Cited by 55 publications

References 117 publications

Petrographic features as an effective indicator for the variation in strength of granites

Petrographic features as an effective indicator for the variation in strength of granites

Early Neoproterozoic syncollisional S-type granites from the western Yangtze Block, South China: Implications for final closure of the back-arc basin

Dual Geochemical Characteristics for the Basic Intrusions in the Yangtze Block, South China: New Evidence for the Breakup of Rodinia

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