Lithostratigraphy and petrology of Lachman Crags and Cape Lachman lava-fed deltas, Ulu Peninsula, James Ross Island, north-eastern Antarctic Peninsula: Preliminary results

Şafak Altunkaynak*, Ercan Aldanmaz, Işil Nur Güraslan, Ayşe Zeynep çalişkanoğlu, Alp ünal, Daniel Nývlt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


This paper presents the preliminary results regarding the lithostratigraphy, petrography and petrology of James Ross Island Volcanic Group dominating the Lachman Crags and Cape Lachman lava-fed deltas in the Ulu Peninsula, James Ross Island north-eastern Antarctic Peninsula. Studied lava-fed deltas were produced via Late Miocene to Pleistocene sub-marine and sub-glacial volcanism and made up four main lithofacies: abottomset pillow lavas, peperites and associated volcanoclastic/siliciclastic deposits; bforeset- bedded hyaloclastite breccias; c- intrusions (feeder dykes, sills, and plugs) and dtopset subaerial lavas. Collectively these lithofacies record the transition from an effusive subaqueous to an effusive subaerial eruption environment. All lava samples and dykes from bottomset, foreset and topset lava-fed delta associations are olivine-phyric alkali basalts and are mineralogically and geochemically homogeneous. These eruptive products display significant enrichments in alkali contents and have ocean island basalt (OIB)-type, intra-plate geochemical signatures characterized by enrichments in all highly to moderately incompatible trace elements relative to basaltic rocks from ocean ridge settings. Volcanic products from a number of different eruptive periods display limited variations in major and trace element relative abundances, indicating derivation from a relatively homogeneous mantle source. The results of quantitative modelling of geochemical data is consistent with the view that the primary melts from which these mafic alkaline rocks were originated are the products of relatively small degrees (~3 - 7%) of partial melting of a volatile-bearing, metasomatized mantle source. The magmatism is likely the result of extension-driven mantle upwelling.

Original languageEnglish
Pages (from-to)60-83
Number of pages24
JournalCzech Polar Reports
Issue number1
Publication statusPublished - 2018

Bibliographical note

Publisher Copyright:
© 2018 Universidad de Murcia Servicio de Publicaciones.


Received July 19, 2018, accepted September 7, 2018. *Corresponding author: S. Altunkaynak <[email protected]> Acknowledgements: This study was carried under the auspices of Turkish Republic Presidency, supported by the Ministry of Science, Industry and Technology, and coordinated by Istanbul Technical University (ITU) Polar Research Center (PolReC). Field study on James Ross Island was undertaken within the scope of TAEII, Turkey-Czech Republic Bilateral Cooperation, and a collaborative research between Istanbul Technical University and Masaryk University in Brno. We would like to express our special thanks to the expedition members and crew of the J.G. Mendel Station for their friendship and logistic support during the field campaign (January-March 2018). The facility of the J.G. Mendel Station is supported by the Ministry of Education, Youth and Sports of the Czech Republic projects no. LM2015078 and CZ.02.1.01/0.0/0.0/16_013/0001708. We also thank the anonymous reviewers for their careful reading of our manuscript and their insightful comments and suggestions.

FundersFunder number
Ministerstvo Školství, Mládeže a TělovýchovyCZ.02.1.01/0.0/0.0/16_013/0001708, LM2015078
Istanbul Teknik Üniversitesi
Bilim, Sanayi ve Teknoloji Bakanliği


    • Antarctica
    • James Ross Island
    • Lava-fed delta
    • Lithostratigraphy
    • Petrology


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