An equation for deriving spatial variations in carbonate production rates from sediment deposition rates and dilution: Application to Santa Maria Island, Azores
The Zambezi deep-sea fan: mineralogical, REE, Zr/Hf, Nd-isotope, and zircon-age variability in feldspar-rich passive-margin turbidites
Tepees associated with mobility of evaporite sulfate: The case of the Irati Formation, Permian of Paraná Basin, Brazil
Provenance of middle to late Pleistocene tills in Illinois, U.S.A.: evidence for long-distance (∼ 2000 km) ice transport during two successive glaciations
COVER EXPLANATION.—Ripples on the inner shelf of Santa Maria island, Azores. The sandy bed here comprises a mixture of carbonate and terrigenous particles. Mitchell et al. (this issue) postulate that, if the terrigenous component is conserved (e.g., it weathers only very slowly), it can act as a tracer, which is progressively diluted away from the island's coasts by carbonate particles. That dilution can be represented by a simple equation based on conservation of mass. Using it, Mitchell et al. find that the rate of production of carbonate particles, mainly from in situ growth of mollusks, increases towards the mid-shelf of the island, where mollusks are less frequently strongly disturbed by water movements.
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