Eclogite trace in evolution of Late Cenozoic alkaline basalt volcanism on the southwestern flank of the Baikal Rift Zone: Geochemical features and geodynamic consequences
- 作者: Perepelov A.1, Kuzmin M.1, Tsypukova S.1, Demonterova E.2, Ivanov A.2, Shcherbakov Y.1, Puzankov M.3, Odgerel D.4, Bat-Ulzii D.5
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隶属关系:
- Vinogradov Institute of Geochemistry, Siberian Branch
- Institute of the Earth’s Crust, Siberian Branch
- Institute of Volcanology and Seismology, Far East Branch
- Institute of Paleontology and Geology
- Mongolian University of Science and Technology
- 期: 卷 476, 编号 2 (2017)
- 页面: 1187-1192
- 栏目: Geochemistry
- URL: https://journals.rcsi.science/1028-334X/article/view/191098
- DOI: https://doi.org/10.1134/S1028334X1710018X
- ID: 191098
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详细
Eclogitized material from the oceanic lithosphere are the most likely source of alkaline basalt magmas in the formation of Late Cenozoic volcanic areas on the southwestern flank of the Baikal Rift Zone. Basaltic trachyandesites of the early stage of volcanism (Pg32 ~ 28–23 Ma) are rich in high field strength elements (HFSE), P2O5, F, Zn, Ga, Sr, Sn, and light rare earth elements (LREE); they are characterized by high values of the following ratios: Fe/Mn = 72–77, Sm/Yb = 7.7–8.5, Sr/Y = 57–63, and Ga/Sc = 2.1–2.3. At this stage, magmas are formed under conditions with a 2–8% degree of partial melting of the mantle substrate enriched with the material of the eclogite source (50–70%) (Cpx/Grt = 1.5–1.7). Basaltoid magmas of the final stage of volcanism (N13–N21 ~ 6–4 Ma) are formed from melting (1.5–4%) of a less fertilized mantle (Cpx/Grt = 2.1–3.1, Fe/Mn = 62–71, Sm/Yb = 3.5–4.6, Sr/Y = 29–44, Ga/Sc = 1.0–1.4). The directed variations of the compositions of the successive basaltoid magmas, which were formed in the Late Cenozoic, create an “eclogite trace” in this area.
作者简介
A. Perepelov
Vinogradov Institute of Geochemistry, Siberian Branch
编辑信件的主要联系方式.
Email: alperdig@irk.ru
俄罗斯联邦, Irkutsk, 650033
M. Kuzmin
Vinogradov Institute of Geochemistry, Siberian Branch
Email: alperdig@irk.ru
俄罗斯联邦, Irkutsk, 650033
S. Tsypukova
Vinogradov Institute of Geochemistry, Siberian Branch
Email: alperdig@irk.ru
俄罗斯联邦, Irkutsk, 650033
E. Demonterova
Institute of the Earth’s Crust, Siberian Branch
Email: alperdig@irk.ru
俄罗斯联邦, Irkutsk, 664033
A. Ivanov
Institute of the Earth’s Crust, Siberian Branch
Email: alperdig@irk.ru
俄罗斯联邦, Irkutsk, 664033
Yu. Shcherbakov
Vinogradov Institute of Geochemistry, Siberian Branch
Email: alperdig@irk.ru
俄罗斯联邦, Irkutsk, 650033
M. Puzankov
Institute of Volcanology and Seismology, Far East Branch
Email: alperdig@irk.ru
俄罗斯联邦, Petropavlovsk-Kamchatsky, 683006
D. Odgerel
Institute of Paleontology and Geology
Email: alperdig@irk.ru
蒙古, Ulan-Bator
D. Bat-Ulzii
Mongolian University of Science and Technology
Email: alperdig@irk.ru
蒙古, Ulan-Bator