FOSSIL DIAGENESIS AND WEATHERING OF PYRITIZED FOSSILS IN THE LATE EDIACARAN GAOJIASHAN BIOTA IN NINGQIANG,SHAANXI
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Abstract:
The Gaojiashan biota known from Ningqiang County of Shaanxi Province,China,is characterized by the three-dimensional pyritization of soft-bodied fossil tubes.Three types of fossiliferous siltstones have been identified in the filed and detailed observations as well as comparisons of diagenetic and weathering attributes have also been documented.Fossil diagenetic characteristics of Conotubus indicate that pyritization initiated firstly and calcite infilling followed.Pyritized Gaojiashan fossils have been subjected to two series of weathering and the former had minor influence on the pyritized fossils,whereas the latter destroyed much of the diagenetic attributes and most likely took place in an oxidative environment.
