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Carboniferous arc setting in Central Hainan:Geochronological and geochemical evidences on the andesitic and dacitic rocks

Shubo Li , HuiyingHe *, Xin Qian, Yuejun Wang
School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, 510275, China

ABSTRACT:Volcanic rocks preserved in the Bangxi-Chenxing zone provide important carries for better understanding the Late Paleozoic tectonic evolution in Hainan and its temporal-spatial linkage with the Eastern Paleotethyan Ocean. This paper presents a set of new geochronological and geochemical data on the andesitic and dacitic rocks along the Bangxi-Chenxing zone in Central Hainan. The representative andesitic and dacitic samples yield similar zircon U–Pb ages of 353±3 Ma and 351±7 Ma, respectively, being of Early Carboniferous origin. These volcanic rocks are characterized by low TiO2 and high Al2O3 contents and are enriched in LILEs and LREEs but depletion in HFSEs along with negative εNd (t) values of -1.4–-4.7 and high 87Sr/86Sr (i) ratios of 0.70719–0.71013. Geochemical signatures suggest that the andesitic and dacitic samples might originate from a metasomatized wedge modified by the slab-derived component in a continental-arc setting. In combination with the available data, the development of a Carboniferous arc-back-arc system in response to the subduction of the Eastern Paleotethyan Ocean can be proposed. The Bangxi-Chenxing zone might westerly link with the Jinshajiang-Ailaoshan-Song Ma suture zone, constituting a suture boundary between the South China and Indochina blocks.

 

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Keywords:Early Carboniferous, arc volcanic rocks, wedge mantle source, Bangxi-Chenxing zone,Central Hainan, Paleotethyan evolution

DOI:
10.1007/s12583-017-0936-0
CLC number:
U469.72
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