Authors: LiJuan Wang JinHai Yu SY O’Reilly WL Griffin Tao Sun ZhenYang Wei ShaoYong Jiang LiangShu Shu
Publish Date: 2008/08/20
Volume: 53, Issue: 19, Pages: 3037-
Abstract
Metamorphic basement rocks in the Cathaysia Block are composed mainly of metasediments with different ages New zircon UPb geochronological results from the metasedimentary rocks exposed in the Zengcheng and Hezi areas southern Cathaysia Block show that they consist dominantly of early Neoproterozoic 10–09 Ga materials with minor Paleoto Mesoproterozoic and late Neoproterozoic 08–06 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 arccontinent collisional setting Singlepeak 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 IndiaEast Antarctica continents in Early Neoproterozoic rather than between western Laurentia and eastern Australia
Keywords: