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Age of Paleozoic Strata in Northern Hainan Island:Constraints from the Detrital Zircon U-Pb Geochronology

Zhang Limin;Wang Yuejun;Zhang Yuzhi;Liu Huichuan;Zhang Xinchang;School of Earth Sciences and Engineering,Sun Yat-Sen University;Key Laboratory of Mineral Resources & Geological Processes,Guangdong Province;  
The Paleozoic sedimentary rocks in the Hainan Island are outcropped mainly in the southern Sanya and sporadically in Qiongzhong terranes.Unlike the Sanya terrane,the depositional period of the Paleozoic sedimentary rocks in the Qiongzhong terrane remains as a controversy due to theabsence of fossils and geochronological data.This paper presents laser zircon U-Pb dating results for the representative sandstone samples from the Paleozoic sequences in the northern Hainan Island.The three samples collected from the previously-mapped Ordovician(11HN-23)and Silurian(11HN-07,-19)give the youngest ~(206)Pb/~(238) U apparent age-peaks at 373 Ma,352 Ma and 369 Ma,respectively.Their detrital zircon age spectrum are similar to those of the sandstone samples taken from the Permian E'cha Formation(11HN-45).These samples yield a predominant age-peak at ~370 Ma and two subordinary age-peaks at~980Ma,~447Ma,along with two age spans of 1 969-1 520 Ma and 2 681-2 328 Ma.Our results suggest that part of the metasedimentary rocks,which were previously-mapped as Ordovician and Silurian in the northern Hainan Island, were most likely deposited in between Carboniferous and Early Permian.This study enriches the geochronological data for the Paleozoic strata and provides new constraints on the tectonic evolution of the Hainan Island.
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