Multivariate analysis of compositional data of bioclastic carbonate sediments from Lady Musgrave Reef, Great Barrier Reef, Australia in Recent advances in geomathematics. An international symposium.
A partir de plusieurs analyses multivariées sur le type de particules, la minéralogie et les éléments-traces de sédiments carbonatés bioclastiques prélevés en haut du Lady Musgrave Reef, les relations obtenues permettent de déterminer deux types de
horizontalement et de façon concentrique au sommet du récif avec un gradient suivant la taille des éléments grossiers en haut et des particules très fines dans le lagon. Ce gradient reflète la décroissance graduelle de l'action hydrodynamique du transport
Sedimentology and hydrodynamics of mixed (siliciclastic-bioclastic) shallow-marine deposits of Acerenza (Pliocene, Southern Apennines, Italy)
During the Pliocene, along the Apennines front of Southern Italy (Acerenza area), a sector of the wedge-top basin hosted shallow-marine siliciclastic-carbonate (-bioclastic) sedimentation. Based on the recognition of textural features, sedimentary
structures, and degree of segregation between siliciclastic and bioclastic particles, facies analysis revealed 10 facies grouped into 5 associations. They suggest the occurrence of either wave or current dominated environments, showing different degrees
of heterolithic segregation between siliciclastic and bioclastic particles. The depositional system was characterised by a gentle sloping profile irregularly undulated by syndepositional gentle folds. Waves dominated the shallowest areas of the mixed system
and the terrigenous fraction derived mainly from wave erosion of substrate (arenaceous) rocks. In the deepest sector of the system (offshore), pervasive bioturbation dominated causing unsegregation of the siliciclastic and bioclastic fractions. - (NF)
Les ooïdes continentaux pédologiques: description et interprétation. On décrit le nucleus des ooïdes (grain détritique, bioclaste| galet| élément de sédiment ou de sol détaché par fissuration liée à la dessiccation| puis leur cortication (ciment
Hydrodynamic behaviour of coarse bioclastic sand from shelly cheniers
This paper focuses on the hydrodynamic behaviour of bioclastic sand sampled from the cheniers of Mont-Saint-Michel bay (France). The dual behaviour of the shell fragments (low settling velocity, good resistance to unidirectional flow) should
Sur la plage de Pattaya, sur la côte E du golfe de Siam, les sédiments de l'estran consistent en un mélange de grains de quartz et de feldspath et de bioclastes marins consolidés par un ciment marin et transformés en beach-rock (microphotographies).
Present-day sedimentary environments in the eastern Weddell Sea confirm low clastic sediment input from wide (> 100 km) ice-shelves. Mainly bioclastic sediments are formed in situ on the inner and shallow central-shelf areas (250 to 350 m water
Nine samples were collected from a 3 m thick section of the Gratteri Formation cropping out at Casa Asciutto, near Isnello (Madonie Mts.) consisting of yellow silty marls alternating to bioclastic marly and quartzy sandstones, rich in displaced