Chinese Science Bulletin

, 46:1828

New observations on spiculelike structures from Doushantuo phosphorites at Weng’an, Guizhou Province

Notes

Abstract

Doushantuo phosphorites at Weng’an, Guizhou Province, provide a unique opportunity for the study of early evolution of multicellular organisms, including metazoans. Our light microscope and SEM observations, however, do not substantiate a sponge spicule interpretation of spicular structures. No convincing axial canals have been seen in the observed spicule population. Instead, the coexistence of some monaxonal spicules with clearly diagenetic crystal fascicles and dumbbells suggest that these monaxons may also be diagenetic in origin. Our preliminary EDS analyses detect no significant silicon in spicule-containing intraclasts (including abiotic clasts and fragments of sphaeromorphic acritarchs and algal thalli), that contain abundant monaxonal spicular structures. We, therefore, believe that the evidence for a sponge spicule interpretation of the Doushantuo spicular structures are at best ambiguous at present; these alleged sponge spicules are indistinguishable from coexistent diagenetic crystals.

Keywords

Doushantuo Formation Neoproterozoic Guizhou phosphorite sponge 

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Copyright information

© Science in China Press 2001

Authors and Affiliations

  1. 1.Nanjing Institute of Geology and PaleontologyChinese Academy of SciencesNanjingChina
  2. 2.Department of GeologyTulane UniversityNew OrleansUSA

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