MioCarb project aims to understand the modern carbon cycle emergence at the late Miocene-early Pliocene (10-4 Ma) transition. This time interval is marked by a global cooling and a steepening of sea surface latitudinal temperature gradient forced by a decrease in atmospheric CO2. Between 9 Ma and 4 Ma, there is an increase in deep oceans carbonate and opal sedimentary fluxes called the Biogenic Bloom which is synchronous with the climatic change. The pelagic carbonate production – an important driver of the carbon cycle – is sustained by the calcareous nannoplankton, photosynthetic algae producing micrometric calcite platelets amount them the coccoliths. During the Biogenic Bloom, there is an increase in the calcareous nannoplankton accumulation rates in the deep oceans. Nevertheless, there are also major macroevolutionary changes within the calcareous nannoplankton community with the decrease in species richness and size and mass per nannofossil. Thel Miocene-early Pliocene carbon cycle transition is then marked by a set of major macroevolutive, biogeochemical and climate changes. MioCarb project aims to understand the origin of the Biogenic Bloom and its impact on the carbon cycle. In order to answer those questions, several complementary tasks are planned: 1) Quantification of calcium carbonate and organic matter mass accumulation rates and calcareous nannofossils and their calcium carbonate mass accumulation rates based on absolute abundance and size quantification over 10 deep-sea drilling sites. This task will quantify CaCO3 by automatic calcimetry and TOC by elementary analysis. The quantification of calcareous nannofossils and their mass will be done with an automatic light microscope purchase with the ANR financial support and the coccolith automatic identification system by artificial intelligence (SYRACO) developed at CEREGE. This task will then quantify the impact of macroevolutionary and paleoceanographic changes on the pelagic sedimentary production during the Biogenic Bloom. 2) Quantification of carbonate mass accumulations at the global scale. This task will focus on data compilation from deep-sea drilling expeditions associated with the state-of-the-art oceanic basins reconstruction from the Australian scientific team EarthByte. This task will lead to a quantitative estimation of CCD evolution through time, the pelagic sedimentary budget and the mass of carbon stored during the Biogenic Bloom. 3) Climatic modeling study including the late Miocene climatic, biologic, sedimentary and geographic specificities in order to reconstruct the origin of the Biogenic Bloom and its impact on the carbon cycle. A team of micropaleontologists, paleoceanographers, sedimentologists, climate modeler, light microscopy engineer and micropaleontology lab technician from CEREGE, AMU and University of Sydney is gathered to carry out this project.