Abstract:

The “radiolarian cherts”within the Northeastern Jiangxi tectonic belt are mainly distributed in Zhangshudun-Maoqiao area, belonging to structuralophiolitic melange belt in Zhangcun Group, flanked by fault to the around lithostratigraphy. They are argillaceous siliceous rocks revealed by their mineral and chemical components. These rocks, associated with argillaceous phyllite, metavolcanite and ophiolite, contain “doubtful” Late Paleozoic radiolarian and are reconstructed by low greenschist-facies metamorphism. While the siliceous rock of Maokou (and/or Gufeng) Formation are widely developed in the Northeastern Jiangxi and South Anhui,they accord with the law of superposition (Smith Stratigraphy) and conformbly located under the coal measure strata of Leping Formation and on the limestone of Xiaojiangbian Formation. These rocks are “pure” siliceous rocks, belonging to the Permian Period. They contain aboundant fossils like the Brachiopod, Fusulinidea faunas and corals, without metamorphism and re-crystallization, associated with carbon-mudstone and limestone. Thus, the “radiolarian cherts” and the siliceous rock of Maokou Formation are diferent lithostratigraphic units.

Key words: Zhangcun Group, Maokou (and/or Gufeng) Formation, siliceous rock, structural-ophiolitic melange block, Northeastern Jiangxi