Grenvillian orogeny in the Southern Cathaysia Block: Constraints from U-Pb ages and Lu-Hf isotopes in zircon from metamorphic basement |
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Authors: | LiJuan Wang JinHai Yu SY O’Reilly WL Griffin Tao Sun ZhenYang Wei ShaoYong Jiang LiangShu Shu |
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Institution: | (1) State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing, 210093, China;(2) GEMOC National Key Centre, Department of Earth and Planetary Science, Macquarie University, Sydney, NSW, 2109, Australia |
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Abstract: | Metamorphic basement rocks in the Cathaysia Block are composed mainly of meta-sediments with different ages. New zircon U-Pb
geochronological results from the meta-sedimentary rocks exposed in the Zengcheng and Hezi areas, southern Cathaysia Block,
show that they consist dominantly of early Neoproterozoic (1.0–0.9 Ga) materials with minor Paleo-to Mesoproterozoic and late
Neoproterozoic (0.8–0.6 Ga) components, suggesting that the detritus mostly come from a Grenvillian orogen. The youngest detrital
zircon ages place a constraint on the deposition time of these sediments in Late Neoproterozoic. Zircon Hf isotopic compositions
indicate that the Grenvillian zircons were derived from the reworking of Mesoproterozoic arc magmatic rocks and Paleoproterozoic
continental crust, implying an arc-continent collisional setting. Single-peak age spectra and the presence of abundant euhedral
Grenvillian zircons suggest that the sedimentary provenance is not far away from the sample location. Thus, the Grenvillian
orogen probably preexisted along the southern margin of the Cathaysia Block, or very close to the south. Similarity in the
ages of Grenvillian orogeny and the influence of the assembly of Gondwana in South China with India and East Antarctic are
discussed, with suggestion that South China was more likely linked with the India-East Antarctica continents in Early Neoproterozoic
rather than between western Laurentia and eastern Australia.
Supported by the National Natural Science Foundation of China (Grant Nos. 40634022, 40221301 and 40672125). This is publication
No. 511 from the National Key Centre for Geochemical Evolution and Metallogeny of Continents. |
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Keywords: | Cathaysia Block Grenvillian orogeny zircon U-Pb age Lu-Hf isotope Neoproterozoic Rodinia supercontinent |
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