U-Pb calcite geochronology, EPR, geochemistry, and C-O-Sr isotopes of Africanomarbles in the Seferihisar (İzmir, Türkiye) U-Pb calcite geochronology, EPR, geochemistry, and C-O-Sr isotopes of Africano marbles in the Seferihisar (İzmir, Türkiye)

Authors

FATMA ŞİŞMAN TÜKELFollow
NAMIK AYSALFollow
İPEK DENİZ YILDIRIMFollow
MARCEL GUILLONGFollow
TONGUÇ UYSALFollow
SİNAN ÖNGENFollow
EMRE ERDEMFollow

Abstract

The Africano marbles (Africano Verde and Bigio Africano) extracted from the region of Sığacık (ancient Teos) region and its surroundings were widely used and even traded in construction and decorative items throughout the Roman period due to their brecciated and colourful appearance. There are two different types of Africano marble, the first consisting of marble breccias embedded in a dark matrix. In this type, the marble breccias show micritic, microsparitic, and sometimes sparitic textures formed by coarse-grained calcite, while the dark matrix consists of chlorite and/or serpentine minerals. The second type is Bigio Africano, which consists of grey-blue homogeneous limestones, composed mainly of microsparitic and sparitic calcite. The geochemical and isotopic characteristics of Africano marbles extracted from three different quarries indicate that these marbles generally originate from carbonates deposited in an open ocean environment. Africano marbles can be easily distinguished from other brecciated marbles (Marmor Sagarium, Marmo Docimeion) by their grain sizes, the textural differences in the marble breccias and their geochemical properties. The same distinction, however, does not apply to Bigio Africano. This grey marble is very similar to other grey marbles used in ancient times. The ⁸⁷Sr/⁸⁶Sr isotope ratios in the whole marble samples vary between 0.70723 (±0.0000059) and 0.70956 (±0.0000058). The δ¹³C isotope values range from –4.96‰ (±0.08) to 3.36‰ (±0.08), while the δ¹⁸O isotope values range from –11.17‰ (±0.10) to –5.41‰ (±0.10). For the first time in this study, the U-Pb calcite age of Africano marbles was determined to be 73.3 ± 11 Ma, and this age is compatible with the fossil ages of limestones from the Bornova flysch zone. All spectroscopic characterization studies and age analyses performed on the Africano marbles will be an important data source for researchers investigating the source of these marbles in the future.

Author ORCID Identifier

FATMA ŞİŞMAN TÜKEL: 0000-0002-6218-1578

NAMIK AYSAL: 0000-0001-9669-7305

İPEK YILDIRIM: 0000-0002-5559-8447

MARCEL GUILLONG: 0000-0002-6920-3362

TONGUÇ UYSAL: 0000-0002-8263-8774

SİNAN ÖNGEN: 0000-0003-2437-2506

EMRE ERDEM: 0000-0002-8395-0364

DOI

10.55730/1300-0985.1977

Keywords

Africano marble, geochemistry, Sr-C-O isotopes, U-Pb dating, provenance studies

First Page

590

Last Page

609

Publisher

The Scientific and Technological Research Council of Türkiye (TÜBİTAK)

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Recommended Citation

ŞİŞMAN TÜKEL, FATMA; AYSAL, NAMIK; YILDIRIM, İPEK DENİZ; GUILLONG, MARCEL; UYSAL, TONGUÇ; ÖNGEN, SİNAN; and ERDEM, EMRE (2025) "U-Pb calcite geochronology, EPR, geochemistry, and C-O-Sr isotopes of Africanomarbles in the Seferihisar (İzmir, Türkiye) U-Pb calcite geochronology, EPR, geochemistry, and C-O-Sr isotopes of Africano marbles in the Seferihisar (İzmir, Türkiye)," Turkish Journal of Earth Sciences: Vol. 34: No. 4, Article 8. https://doi.org/10.55730/1300-0985.1977
Available at: https://journals.tubitak.gov.tr/earth/vol34/iss4/8