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Origin of holocene beachrock cements in northeastern Brazil: Evidence from carbon and oxygen isotopes
Univ Fed Rio Grande do Norte, Ctr Ciencias Exatas & Terra, Dept Geol, Natal, RN, Brazil..
Univ Fed Pernambuco, NEG LABISE, Dept Geol, Recife, PE, Brazil..
Univ Fed Rio Grande do Sul, Programa Posgrad Geociencias, Porto Alegre, RS, Brazil..
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Petr Inst, Dept Petr Geosci, POB 2533, Abu Dhabi, U Arab Emirates..
2017 (English)In: Journal of South American Earth Sciences, ISSN 0895-9811, E-ISSN 1873-0647, Vol. 79, p. 401-408Article in journal (Refereed) Published
Abstract [en]

This study has utilized carbon and oxygen isotopic data to unravel the origin of Holocene beachrock cements of Rio Grande do Norte State coast, northeastern Brazil. The cements are exclusively constituted of Mg-calcite, with isopachous prismatic rim, equant spar, cryptocrystalline coating or pore-filling, pseudo-peloidal, radial and scalenohedral habits. The delta O-18(VPDB) values of most (93%) of the samples range from -1.8 parts per thousand to +0.5 parts per thousand, which are compatible with precipitation from marine waters. The delta C-13(VPDB) values of these cements are +1.7 to +3.6 parts per thousand (average + 3.05 parts per thousand) suggesting derivation from marine dissolved carbon. In a few cases, the Mg-calcite cement shows low delta C-13(VPDB) (-7.3% o and -7.8 parts per thousand) and delta O-18(VPDB) (-4.4 parts per thousand and -4.3) values, which may indicate precipitation or recrystallization of marine cements under the influence of meteoric waters.

Place, publisher, year, edition, pages
2017. Vol. 79, p. 401-408
Keywords [en]
Beachrock, Stable isotopes, Mg-calcite cement, Marine water
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-341651DOI: 10.1016/j.jsames.2017.09.002ISI: 000414619400028OAI: oai:DiVA.org:uu-341651DiVA, id: diva2:1183365
Available from: 2018-02-16 Created: 2018-02-16 Last updated: 2018-02-16Bibliographically approved

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Morad, Sadoon

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