Abstract：There were two global-scale glacial events, Sturtian and Marinoan, during the Cryogenian in late Neoproterozoic.It is known as the “Snowball Earth”period, and the paleoclimate evolution during this period has been widely concerned by geologists.The Nanhua system in Yangtze region was equivalent to the Cryogenian, and the Datangpo formation was interglacial sedimentary deposits during the Gucheng (Sturtian) and the Nantuo (Marinoan) glacial period.In this paper, the elemental geochemistries of the fine clastic rock samples from Datangpo formation of ZK701 drillcore in Zouma area of western Hubei province were studied.ICV(component variation index) values showed that the sediments had the characteristic of primary sedimentation.CIA(chemical alteration index) ,CIW(chemical weathering index) ,PIA(plagioclase alteration index) ,n(Al) /n(Ca) andn(Na) /n(K) ratio were calculated, and the paleoclimatic evolution of the Nanhua interglacial period in this area was discussed.According to previous studies, the climate of Datangpo in the early interglacial period was dry and cold (CIAvalue ranged from 55.6 to 69.8, mean value 65.0) , and the climate in middle and late interglacial period was warm, humid and stable (CIAvalue ranged from 71.0 to 77.7, mean value 73.4) .The paleoclimate evolution process reflected byCIW,PIA,n(Na) /n(K) , and other values were consistent with theCIAvalue, and the change ofn(Al) /n(Ca) value also reflected the fluctuation of terrigenous debris input with the paleoclimate.This study provided basic data for the interglacial paleoclimate evolution of Nanhua period in Yangtze region.

Keyword：Western Hubei;Datangpo formation;fine clastic rock;major element;paleoclimate;