Scasso, RA; McArthur, JM; del Rio, CJ; Martinez, S; Thirlwall, MF; (2001) Sr-87/Sr-86 Late Miocene age of fossil molluscs in the 'Entrerriense' of the Valdes Peninsula (Chubut, Argentina). Journal of South American Earth Sciences , 14 (3) pp. 319-329. 10.1016/S0895-9811(01)00032-3.

Text McArthur_564_2001 J. S. Amer. Earth Sci. Argentina Sr.pdf - Published Version Access restricted to UCL open access staff Download (632kB)

Abstract

87Sr/86Sr analysis on calcitic shells of pectinids (Chlamys actinodes and Chesapecten crassus) and oysters (Ostrea sp.) shows that the ‘Entrerriense’ sequence belonging to the Puerto Madryn Formation, Valdés Penı́nsula (Chubut), was deposited at about Full-size image (<1 K) Thus, a middle Tortonian age is assigned to the sequence. Within the sequence, the pectinids better retain their original 87Sr/86Sr ratio, whilst the oysters are altered and yield older-than-real ages. The latter is the result of greater susceptibility to interaction with diagenetic fluids bearing Sr derived from the alteration of tuffaceous materials and volcanic rocks of intermediate and basic composition.

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