Title

Aldanmaz, E., Köprübaşı, N., Gürer, Ö. F., Kaymakçı, N. and Gourgaud, A. (2006): Geochemical constraints on the Cenozoic, OIB-type alkaline volcanic rocks of NW Turkey: implications for mantle sources and melting processes. Lithos, 86: 50-76.

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Barker, D. H. N., Christenson, G. L., Austin, J. A. and Dalziel, I. W. D. (2003): Backarc basin evolution and cordilleran orogenesis: Insights from new ocean-bottom seismograph refraction profiling in Bransfield Strait, Antarctica. Geology, 31: 107-110.

Bastías, J., Hervé, F., Fuentes, F., Schilling, M., Poiron, A. and Gutiérrez, F. (2012): Mantle xenoliths found at Santa Martha cove, James Ross Island, Antarctica. 13° Congreso Geológico Chileno, Actas: 365-367, Antofagasta.

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Chen, H., Xia, Q. K., Ingrin, J., Deloule, E. and Bi, Y. (2017): Heterogeneous source components of intraplate basalts from NE China induced by the ongoing Pacific slab subduction. Earth and Planetary Science Letters, 459: 208-220.

Crame, J. A., Pirrie, D., Riding, J. B. and Thomson, M. R. A. (1991): Campanian–Maastrichtian (Cretaceous) stratigraphy of the James Ross Island area, Antarctica. Journal of the Geological Society, London, 148: 1125-1140.

Dasgupta, R., Hirschmann, M. M. and Stalker, K. (2006): Immiscible transition from carbonate-rich to silicate-rich melts in the 3 GPa melting interval of eclogites + CO2 and genesis of silica-undersaturated ocean island lavas. Journal of Petrology, 47: 647-671.

Day, J. M. D., Pearson, D. G., Macpherson, C. G., Lowry, D. and Carracedo, J.-C. (2009): Pyroxenite-rich mantle formed by recycled oceanic lithosphere: oxygen–osmium isotope evidence from Canary Island lavas. Geology, 37: 555-558.

del Valle, R. A. and Scasso, R. A. (2004): Límite de la cuenca Larsen en la península Tabarin, Antártida. Revista de la Asociación Geológica Argentina, 59(1): 38-44.

Edwards, B. R., Russell, J. K. and Anderson, R. G. (2002): Subglacial, phonolitic volcanism at Hoodoo Mountain volcano, northwestern Canadian Cordillera. Bulletin of Volcanology, 64: 254-272.

Hambrey, M. J., Smellie, J. L., Nelson, A. E. and Johnson, J. S. (2008): Late Cenozoic glacier volcano interaction on James Ross Island and adjacent areas, Antarctic Peninsula region. Geological Society of America Bulletin, 120 (5/6): 709-731.

Herron, E. M., Tucholke, B. E. (1976): Sea-floor magnetic patterns and basement structure in the southeastern Pacific. In: C.D. Hollister et al. (eds.): Initial Reports of the Deep Sea Drilling Project, 35, U.S. Goverment Printing Office, Washington D.C., pp. 263-278.

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Irvıne, T. N., Baragar, W. R. A. (1971): A guide to the chemical classification of the common volcanic rocks. Canadian Journal of Earth Sciences, 8: 448-523.

Janoušek, V., Farrow, C. M. and Erban, V. (2006): Interpretation of whole-rock geochemical data in igneous geochemistry: introducing Geochemical Data Toolkit (GCDkit). Journal of Petrology, 47 (6): 1255-1259.

Jones, J. G., Nelson, P. H. H. (1970): Flow of basalt lava from air into water. Its structural expression and stratigraphic significance. Geological Magazine, 107: 13-19.

Jonkers, H.A., Lirio, J.M., del Valle, R.A. and Kelley, S.P. (2002): Age and environment of Miocene–Pliocene glaciomarine deposits, James Ross Island, Antarctica. Geological Magazine, 139: 577-594.

Jung, S. Pfänder, J.A. Brauns, M. and Maas, R. (2011): Crustal contamination and mantle source characteristics in continental intra-plate volcanic rocks: Pb, Hf and Os isotopes from central European volcanic province basalts. Geochimica et Cosmochimica Acta, 75: 2664-2683.

Kımura, J.-I., Gıll, J. B., Skora, S., van Keken, P. E. and Kawabata H. (2016): Origin of geochemical mantle components: Role of subduction filter. Geochemistry, Geophysics, Geosystems, 17: 3289-3325, doi:10.1002/2016GC006343.

Kıseeva, E. S., Lıtasov, K. D., Yaxley, G. M., Ohtanı, E. and Kamenetsky, V. S. (2013): Melting and phase relations of carbonated eclogite at 9–21 GPa and the petrogenesis of alkali rich melts in the deep mantle. Journal of Petrology, 54 (8): 1555-1583.

Košler, J., Magna, T., Mlčoch, B., Mıxa, P., Nývlt, D. and Holub, F. V. (2009): Combined Sr, Nd, Pb and Li isotope geochemistry of alkaline lavas from northern James Ross Island (Antarctic Peninsula) and implications for back-arc magma formation. Chemical Geology, 258: 207-218.

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Title:	Lithostratigraphy and petrology of Lachman Crags and Cape Lachman lava-fed deltas, Ulu Peninsula, James Ross Island, north-eastern Antarctic Peninsula: Preliminary results
Authors Name:	Şafak Altunkaynak, Ercan Aldanmaz, Işıl Nur Güraslan, Ayşe Zeynep Çalışkanoğlu, Alp Ünal, Daniel Nývlt
Journal:	Czech Polar Reports
Issue:	8
Volume:	1
Page Range:	60-83
No. of Pages:	24
Year:	2018
DOI:	10.5817/CPR2018-1-5
Publishers:	muniPress Masaryk University Brno
ISSN:	1805-0689 (Print), 1805-0697 (On-line)
Language:	English
Subject:
Abstract:	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: a- bottomset pillow lavas, peperites and associated volcanoclastic/siliciclastic deposits; b- foreset-bedded hyaloclastite breccias; c- intrusions (feeder dykes, sills, and plugs) and d- topset 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.
Keywords:	Antarctica, James Ross Island, Lava-fed delta, lithostratigraphy, petrology
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