Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8912515 | Precambrian Research | 2018 | 54 Pages |
Abstract
Neoproterozoic paleogeography of the South China is dominated by the formation of Rodinia, its break-up, and the subsequent amalgamation of Gondwana. Two negative excursions of the chemical index of alteration (CIA) and the chemical index of weathering (CIW) recorded in the Cryogenian to Ediacaran sedimentary rocks of the Cathaysia Block, South China, indicate two cooling events. In combination with available age constraints, this data suggests correlation with the global Marinoan (ca. 650-635â¯Ma) and Gaskiers (ca. 579â¯Ma) glaciations. U-Pb ages of detrital zircons from the Cryogenian to lower Ediacaran strata define two distinctive age peaks at 1056â¯Ma and 998â¯Ma, whereas the upper Ediacaran strata show only one age peak at 957â¯Ma. These data demonstrate Neoproterozoic sedimentary rocks in the Cathaysia Block were derived from a source external to the craton. The predominant late Mesoproterozoic to early Neoproterozoic (1140-870â¯Ma) detrital zircons were most likely derived from a source dominated by North India and East Antarctica with limited input from Western Australia. Furthermore, εHf(t) values of detrital zircons are similar to the coeval detrital zircons from Rayner-Eastern Ghats. The detrital record of the late Cryogenian and Ediacaran strata in the Cathaysia Block suggests that the South China Block was connected to the northern margin of India during the dispersal of Rodinia and the assembly of East Gondwana. Detrital zircons from Cryogenian strata overlying the Jiangnan Orogen are largely in the range 900-700â¯Ma with scattered Archean and Paleoproterozoic grains. These ages are consistent with derivation from local sources within South China. The timing of accumulation of these units, after collisional assembly of South China, likely accounts for their more restricted provenance with collision generated relief providing both a local source and restricting input from further south within India and/or the rest of Gondwana.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Liang Qi, Yajun Xu, Peter A. Cawood, Yuansheng Du,