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Diagenetic aspects of Orbiculoidea in phosphatic concretions (Devonian, unit 2, Chapada group, MS): taphonomic and paleoenvironmental implications

Grant number: 16/17219-3
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): January 01, 2017
Effective date (End): November 30, 2017
Field of knowledge:Biological Sciences - Zoology - Paleozoology
Principal researcher:Mírian Liza Alves Forancelli Pacheco
Grantee:Victoria Giopato Benini
Home Institution: Centro de Ciências Humanas e Biológicas (CCHB). Universidade Federal de São Carlos (UFSCAR). Sorocaba , SP, Brazil

Abstract

The mineralogical characteristics of tegument can influence differential preservation processes among organisms (e.g. dissolution and concretization). In this context, stand out the chitin-phosphatic shells of orbiculoid brachiopods, fossil group that also composed the Malvinokaffric Relm. These fossils are usually preserved in phosphatic concretions in Devonian sediments of the Paraná Basin (Alto Garças Sub-basin). It is possible that the phosphatic nature of these shells has propitiated favorable microenvironment for the concretization, since the calcium phosphate can elevate the formation of apatite concretions. Hence, this group can be used as a model in studies of diagenesis concerned with alteration processes such as dissolution and deposition of calcium phosphate in concretions. In addition, the taphonomic biases involved in the process, may have taxonomical implications. Thus, the objectives of this study are: (1) to investigate micro and ultrastructure changes in orbiculoides preserved in concretions and other types of fossilization; (2) to understand diagenetic aspects in these phosphatic concretions and; (3) to investigate the relations between the presence of Rare Earth Elements (REE) and the formation of concretions in orbiculoides. Therefore, specimens collected near Rio Verde (Alto Garças Sub-Basin, MS) will be processed for observations under stereomicroscopy, MEV and petrography as well as other paleometric techniques, such as Raman spectroscopy, X-ray fluorescence, EMPA, EDXRF to assist in the investigation of geochemical aspects of the fossililization of those specimens. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GOMES, AMANDA L. S.; BECKER-KERBER, BRUNO; OSES, GABRIEL L.; PRADO, GUSTAVO; BECKER KERBER, PEDRO; DE BARROS, GABRIEL E. B.; GALANTE, DOUGLAS; RANGEL, ELIDIANE; BIDOLA, PIDASSA; HERZEN, JULIA; et al. Paleometry as a key tool to deal with paleobiological and astrobiological issues: some contributions and reflections on the Brazilian fossil record. International Journal of Astrobiology, v. 18, n. 6, p. 575-589, . (09/02312-4, 16/17219-3, 17/21584-1, 16/01827-4, 16/06114-6)
BECKER-KERBER, BRUNO; OSES, GABRIEL LADEIRA; CURADO, JESSICA FLEURY; RIZZUTTO, MARCIA DE ALMEIDA; RUDNITZKI, ISAAC DANIEL; ROMERO, GUILHERME RAFFAELI; ONARY-ALVES, SILVIO YUJI; BENINI, VICTORIA GIOPATO; GALANTE, DOUGLAS; RODRIGUES, FABIO; et al. GEOBIOLOGICAL AND DIAGENETIC INSIGHTS FROM MALVINOKAFFRIC DEVONIAN BIOTA (CHAPADA GROUP, PARANA BASIN, BRAZIL): PALEOBIOLOGICAL AND PALEOENVIRONMENTAL IMPLICATIONS. PALAIOS, v. 32, n. 4, p. 238-249, . (16/17219-3, 12/00202-0)

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