Deep melts of large volcanoes and volcanic provinces of West Antarctica: new experimental data

1Bakhmutov, VG
Soloviev, VD
Yakymchuk, NA
1Korchagin, IN
1S. I. Subbotin Institute of Geophysics of the NAS of Ukraine, Kyiv
Dopov. Nac. akad. nauk Ukr. 2020, 6:46-53
Section: Geosciences
Language: Russian

New experimental data on the deep distribution of the frequency-resonance characteristics of rocks for Western Antarctica separate volcanoes and volcanic provinces have been obtained. The research results show the existence, in the West Antarctica, of a complex magma-gas-fluid system, consisting of a series of magma chambers with magmas that were raised from the mantle to intermediate (crustal) accumulation zones. The deep boundaries have been identified for volcanoes and volcanic provinces canal roots position with different ages — 95, 217, 470, and 723 km. These results indicate the significant role of the multiphase pulsed volcanic activity (along vertical channels of deep fluid migration) in the formation of the tectonic diversity and the evolution of continental margin structures in the Antarctic region. According to the frequency resonance studies data, channels with different formation depths are filled with basalts, kimberlites, ultramafic rocks, and various groups of sedimentary rocks. The presence of volcanic structures with roots at various depths suggests their regular relationship with the processes of tectonic activation in this region that have occurred over the past 500 million years. The use of reference frequencies for different types of known rocks allows one to study the deep structure of our planet and to solve the problems of search for many minerals.

Keywords: deep structure, direct searches, Erebus, mobile technology, remote sensing data processing, Ross Sea, volcanoes, West Antarctica

1. Bakhmutov, V. G., Tretyak, K. R., Maksimchuk, V. Yu. et al., іn. (2017). The structure and dynamics of geophysical fields at West Antarctica. Lviv (in Ukrainian).
2. Levashov, S. P., Yakimchuk, N. A. & Korchagin, I. N. (2012). Frequency-resonance principle, mobile geoelectric technology: a new paradigm of geophysical research. Geophysical journal. 34, No. 4, pp. 167-176 (in Russian).
3. Udintsev, G. B, Beresnev, A. F., Kurentsova, N. A. et al. (2010). Drake Strait and the Skosha Sea — ocean gate of Western Antarctica. Structure and history of the development of the lithosphere. Moscow: Paulsen (in Russian).
4. Yakimchuk, N. A. & Korchagin, I. N. (2019). The study of the internal structure of volcanic complexes of various types according to the results of frequency-resonance processing of satellite images and photographs. Geoinformatics, No. 4, pp. 5-18 (in Russian).
5. Yakimchuk, N. A., Korchagin, I. N., Bakhmutov, V. G. & Soloviev, V. D. (2019). Geophysical surveys in the Ukrainian Ukrainian Antarctic Expedition 2018: mobile measuring equipment, innovative direct search methods, new results. Geoinformatika, No. 1, pp. 5-27 (in Russian).
6. Daya, J. M. D., Harveyb, R. P. & Hiltona, D. R. (2019). Melt-modified lithosphere beneath Ross Island and its role in the tectono-magmatic evolution of the West Antarctic Rift System. Chemical Geology, 518, pp. 45-54.
7. Gupta, S., Zhao, D. & Rai, S. S. (2009). Seismic imaging of the upper mantle under the Erebus hotspot in Antarctica. Gondwana research, 16, pp. 109-118.
8. Haeger, C., Kaban, M. & Tesauro, M. (2019). 3’D Density, Thermal, and Compositional Model of the Antarctic Lithosphere and Implications for Its Evolution. Geochemistry, Geophysics. Geosystems, 20, Iss. 2, pp. 688-707.
9. Hill, G. J. (2019). On the Use of Electromagnetics for Earth Imaging of the Polar Regions. Surveys in Geophysics.
10. Iakovino, K. (2015). Linking subsurface to surface degassing at active volcanoes: Athermodynamic model with applications to Erebus volcano. ESPL, 431, pp. 59-74.
11. Rocchi, S., Armienti, P., D’Orazio, M. et al. (2002). Cenozoic magmatism in the western Ross Embayment: Role of mantle plume versus plate dynamics in the development of the West Antarctic Rift System. JGR, 107, No. B9, pp. 1-22.
12. Shen, W., Wiens, D. A., Anandakrishnan, S. et al. (2018). The Crust and Upper Mantle Structure of Central and West Antarctica From Bayesian Inversion of Rayleigh Wave and Receiver Functions. JGR: Solid Earth, 123, pp. 7824-7849.
13. Vries, M. V. W., Bingham, R. G. & Hein A. S. (2017). A new volcanic province: an inventory of subglacial volcanoes in West Antarctica Geological Society, London, Special Publications, 461, pp. 231-248.
14. Winberry, J. P. & Anandakrishnan, S. (2004). Crustal structure of the West Antarctic rift system and Marie Byrd Land hotspot. Geology, 32(11), pp. 977-980.