THE UPPER CAMBRIAN NORTH CHINA SPICE EVENT: NEW STRONTIUM ISOTOPE DATA AND ITS IMPLICATIONS
The Cambrian North China Platform was believed to be mostly shallow-water deposits. It lacks the biostratigraphic significant agnostids Glyptagnostus recticulatus for global correlation of the base of the Paibian Stage. The onset of the SPICE signals helped to enhance the stratigraphic correlation between North China and the other paleo-continents. Nonetheless, the relationship between these chemical signals and the trilobite turnover event is still not entirely clear.
Here, we combined our published carbon and oxygen isotope data with the new strontium isotope (87Sr/86Sr) results from the Huangyangshan section, Shandong Province, on the North China Platform. The preliminary results indicate that the strontium isotope values are compatible to the modern ocean and may be even slightly higher. The relatively high values could signify an increase in chemical weathering rate. Besides, other than the published trilobite and carbon isotope information, by comparing with the global seawater 87Sr/86Sr curve, the new strontium isotope results may also provide an additional constraint on the depositional age of the Huangyangshan section.