Faylona Mgpg auteur aut IRD Lazareth Claire E. auteur aut IRD Sémah Anne-Marie auteur aut IRD Caquineau Sandrine auteur aut IRD Boucher Hugues auteur aut IRD Ronquillo W. P. auteur aut IRD text journalArticle eng text/pdf born digital access Tridacnidae shells, a valuable archive of past environments, are common in the Balobok Rockshelter archaeological site on Sanga-Sanga Island in the south Philippines. This site was occupied during the mid-Holocene (ca. 5000-8800 C-14 yr B.P.), a period of Neolithic cultural expansion in the Philippines. This paper focuses on the preservation of two shell specimens, Hippopus hippopus and Tridacna maxima, unearthed from two mid-Holocene layers within the rockshelter. The shells' mineralogy and microstructure (prismatic and crossed-lamellar) were studied using micro-Fourier transform infrared spectroscopy and scanning electron microscopy to determine if the samples were suitable as paleoenvironmental records. Both shells are still aragonitic but aragonite crystals of both microstructure types are partly dissolved. This dissolution, characteristic of meteoric water alteration, precludes their utility in paleoenvironmental geochemical studies. Nevertheless, these shells are abundant in archaeological sites in the region and may be better preserved in other depositional contexts; more studies on Philippine Tridacnidae shell diagenesis are needed. specialized 112 064 26 6 888-901 2011 0883-6353 https://www.documentation.ird.fr/hor/fdi:010053913 10.1002/gea.20377 0883-6353 [F B010053913] https://www.documentation.ird.fr/hor/fdi:010053913 https://www.documentation.ird.fr/intranet/publi/2011/11/010053913.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-11-30 2017-08-23 fdi:010053913 fre