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BURIAL RATE DETERMINES HOLOCENE RHODOLITH DEVELOPMENT ON THE BRAZILIAN SHELF

2018; Society for Sedimentary Geology; Volume: 33; Issue: 10 Linguagem: Inglês

10.2110/palo.2017.109

1938-5323

Poliana S. Brasileiro, Juan C. Braga, Gilberto M. Amado‐Filho, Rachel Nunes Leal, Davide Bassi, Tarcila Franco, Alex Cardoso Bastos, Rodrigo L. Moura,

Coral and Marine Ecosystems Studies

Research Article| October 09, 2018 BURIAL RATE DETERMINES HOLOCENE RHODOLITH DEVELOPMENT ON THE BRAZILIAN SHELF POLIANA S. BRASILEIRO; POLIANA S. BRASILEIRO 1Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, 22460-030 Rio de Janeiro, RJ, Brazil Search for other works by this author on: GSW Google Scholar JUAN C. BRAGA; JUAN C. BRAGA 2Departamento de Estratigrafía y Paleontología, Universidad de Granada, Campus Fuentenueva, s/n, 18002, Granada, Spain Search for other works by this author on: GSW Google Scholar GILBERTO M. AMADO-FILHO; GILBERTO M. AMADO-FILHO 1Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, 22460-030 Rio de Janeiro, RJ, Brazil Search for other works by this author on: GSW Google Scholar RACHEL N. LEAL; RACHEL N. LEAL 1Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, 22460-030 Rio de Janeiro, RJ, Brazil Search for other works by this author on: GSW Google Scholar DAVIDE BASSI; DAVIDE BASSI 3Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, via Saragat 1, I-44122 Ferrara, Italy Search for other works by this author on: GSW Google Scholar TARCILA FRANCO; TARCILA FRANCO 4Departamento de Oceanografia, Universidade Federal do Espírito Santo, Avenida Fernando Ferrari 514, 29090-600 Vitória, ES, Brazil Search for other works by this author on: GSW Google Scholar ALEX C. BASTOS; ALEX C. BASTOS 4Departamento de Oceanografia, Universidade Federal do Espírito Santo, Avenida Fernando Ferrari 514, 29090-600 Vitória, ES, Brazil Search for other works by this author on: GSW Google Scholar RODRIGO L. MOURA RODRIGO L. MOURA 5Departamento de Biologia Marinha, Instituto de Biologia, Universidade Federal do Rio de Janeiro, CP68011, 21944-970, Rio de Janeiro, RJ, Brazil Search for other works by this author on: GSW Google Scholar PALAIOS (2018) 33 (10): 464–477. https://doi.org/10.2110/palo.2017.109 Article history first online: 09 Oct 2018 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation POLIANA S. BRASILEIRO, JUAN C. BRAGA, GILBERTO M. AMADO-FILHO, RACHEL N. LEAL, DAVIDE BASSI, TARCILA FRANCO, ALEX C. BASTOS, RODRIGO L. MOURA; BURIAL RATE DETERMINES HOLOCENE RHODOLITH DEVELOPMENT ON THE BRAZILIAN SHELF. PALAIOS 2018;; 33 (10): 464–477. doi: https://doi.org/10.2110/palo.2017.109 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyPALAIOS Search Advanced Search Abstract The structure and composition of rhodoliths in two regions of the Brazilian shelf, Abrolhos Continental Shelf (ACS) and South Espírito Santo State (SES) were examined and compared. Rhodoliths were sampled at depth ranges of 10–20 m and 50–60 m in SES, and 20–30 m and 50–75 m in ACS. Rhodoliths in SES are algal boundstones, built mainly of melobesioid corallines, with subordinate bryozoans and encrusting foraminifers. They show high porosity and the sediment infill of borings and voids contains a relatively high amount of siliciclastics (up to 8%). Rhodoliths from ACS are formed by a structureless carbonate mass covered by a thin veneer of encrusting coralline algae. The massive interior was produced by multiphase boring and infilling of an original boundstone. The infillings consist of a micritic matrix with bioclasts and low amounts of siliciclastic grains. Coralline assemblages are reduced to fragments of thin crusts. Rhodoliths from shallow depths are small (< 8 cm) whereas rhodoliths from the deeper zone have a wide size range (1 to 17 cm). The innermost parts of deeper rhodoliths in ACS yield radiocarbon ages of ∼ 7,000 years BP (75 m) and ∼ 2,000 years BP (65 m). Rhodoliths from the deep zone in SES are younger (less than 700 years BP). Siliciclastic sediment influx reaching rhodolith beds promotes burial of rhodoliths, determining the small size of shallow SES rhodoliths and the relatively young ages of the deeper ones. Scarce siliciclastic influx at the ACS rhodolith beds favors long residence times of rhodoliths on the seafloor, resulting in a thorough destruction of the original coralline/invertebrate boundstone by bioerosion. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.