第八届青年地学论坛

The Anthropocene has yet to be formalised as a new epoch, and a robust Global Boundary Stratotype Section and Point (GSSP) with an appropriate primary marker must be established. Here we systematically analysed stratigraphic records of five possible markers: ^239+240Pu, spheroidal carbonaceous particles (SCPs), plastics, NO₃^– + δ¹⁵N, and Pb. The potential of each as a primary marker for the Anthropocene was assessed on the basis of the requirements of long-term preservation, wide-ranging distribution, and globally synchronized human-related variations in the mid 20^th century. The results indicate that ^239+240Pu is the most suitable primary marker owing to its globally synchronous peak during the 1950s. Local and regional variations in SCP and Pb concentrations in geological facies preclude their use as primary markers, but they may have applications as secondary markers. NO₃^– and δ¹⁵N are not appropriate markers because of natural variations caused by the global nitrogen cycle. Further research on sedimentary plastics is required to assess their applicability as an Anthropocene marker. Additional work is also needed for Pb, particularly considering that Pb isotope ratios reflect the globally enhanced consumption of leaded gasoline after World War II, which may be reflected in a globally synchronous change during the 1950s.

GSSP,人类世,关键标志物,zhibiaotixi,地层记录