Research output: Contribution to journal › Article › peer-review
Distribution of PGE in Permo-Triassic basalts of the Siberian Large Igneous Province. / Izokh, A. E.; Medvedev, A. Ya; Fedoseev, G. S. et al.
In: Russian Geology and Geophysics, Vol. 57, No. 5, 01.05.2016, p. 809-821.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Distribution of PGE in Permo-Triassic basalts of the Siberian Large Igneous Province
AU - Izokh, A. E.
AU - Medvedev, A. Ya
AU - Fedoseev, G. S.
AU - Polyakov, G. V.
AU - Nikolaeva, I. V.
AU - Palesskii, S. V.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - We have revealed the spatio-temporal regularities of distribution of platinum group elements (PGE) in basaltoids related to the activity of the Siberian mantle plume. As objects of study, we chose rift and flood basalts from the Norilsk district (sampled from the SD-9 borehole), flood basalts from the central part of the Tunguska syneclise (Lower Tunguska), Kuznetsk Basin traps, and subalkalic basalt from the Semeitau volcanoplutonic structure in eastern Kazakhstan. Based on the PGE patterns of basaltoids related to the activity of the Permo-Triassic Siberian plume, we have shown that the rocks that formed in the central part of the Siberian Large Igneous Province (LIP) at the early rift stage have low contents of PGE, whereas picrites and tholeiitic flood basalts have high contents. The rift (Semeitau structure) and flood (Kuznetsk Basin traps) basalts from the peripheral regions are characterized by extremely low PGE contents. The high PGE contents in magmas of the plume head are responsible for the high productivity of ultramafic-mafic trap magmatism. The elevated K contents in magmas and the high PGE contents in the mantle plume head are probably due to the ascent of deep-seated material from the core-lower-mantle boundary, as follows from the thermochemical model of the Siberian plume.
AB - We have revealed the spatio-temporal regularities of distribution of platinum group elements (PGE) in basaltoids related to the activity of the Siberian mantle plume. As objects of study, we chose rift and flood basalts from the Norilsk district (sampled from the SD-9 borehole), flood basalts from the central part of the Tunguska syneclise (Lower Tunguska), Kuznetsk Basin traps, and subalkalic basalt from the Semeitau volcanoplutonic structure in eastern Kazakhstan. Based on the PGE patterns of basaltoids related to the activity of the Permo-Triassic Siberian plume, we have shown that the rocks that formed in the central part of the Siberian Large Igneous Province (LIP) at the early rift stage have low contents of PGE, whereas picrites and tholeiitic flood basalts have high contents. The rift (Semeitau structure) and flood (Kuznetsk Basin traps) basalts from the peripheral regions are characterized by extremely low PGE contents. The high PGE contents in magmas of the plume head are responsible for the high productivity of ultramafic-mafic trap magmatism. The elevated K contents in magmas and the high PGE contents in the mantle plume head are probably due to the ascent of deep-seated material from the core-lower-mantle boundary, as follows from the thermochemical model of the Siberian plume.
KW - Geochemistry
KW - Large Igneous Provinces
KW - PGE
KW - Ultramafic-mafic intrusions
UR - http://www.scopus.com/inward/record.url?scp=84969821685&partnerID=8YFLogxK
U2 - 10.1016/j.rgg.2016.04.005
DO - 10.1016/j.rgg.2016.04.005
M3 - Article
AN - SCOPUS:84969821685
VL - 57
SP - 809
EP - 821
JO - Russian Geology and Geophysics
JF - Russian Geology and Geophysics
SN - 1068-7971
IS - 5
ER -
ID: 25489070