CYCLIC FLUCTUATION OF CARBONATE PRODUCTIO N THROUGH THE JURASSIC ALONG A BURGUNDY-ARDECHE CROSS-SECTION, EASTERN FRANCE

Relative carbonate accumulation rates are calculated through the Juras sic from 2-D restored depositional geometries of a shelf-basin cross-s ection. Rates show periodic cycles through time (12 and 19 Ma), with a difference of one order of magnitude. Maximum rates are close in valu e whatever the location, extent and nature of the carbonate factory. T he results suggest that a carbonate platform drowning can actually be induced by a major fall in carbonate production only. The long-term cy cles in carbonate productivity are believed to have been under the con trol of an ocean-related parametre that is the marine water CO2 conten ts.