Refractory “dark biogenic silica” and its effects on the connection between the marine cycles of carbon and silicon

Manuel Maldonado1, Maria Lopez-Acosta2, Marta Garcia-Puig2, Celia Sitja2 and Gemma Ercilla3, (1)Center for Advanced Studies of Blanes (CEAB, CSIC), Department of Marine Ecology, Blanes, Spain, (2)Center for Advanced Studies of Blanes (CEAB-CSIC), Blanes, Spain, (3)Instituto Ciencias del Mar-CSIC, Barcelona, Spain