Stages of Trap Magmatism in the Norilsk Area : New Data on the Structure and Geochemistry of the Volcanic Rocks. / Krivolutskaya, N. A.; Kuzmin, D. V.; Gongalsky, B. I. et al.
In: Geochemistry International, Vol. 56, No. 5, 01.05.2018, p. 419-437.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Stages of Trap Magmatism in the Norilsk Area
T2 - New Data on the Structure and Geochemistry of the Volcanic Rocks
AU - Krivolutskaya, N. A.
AU - Kuzmin, D. V.
AU - Gongalsky, B. I.
AU - Roshchina, I. A.
AU - Kononkova, N. N.
AU - Svirskaya, N. M.
AU - Romashova, T. V.
PY - 2018/5/1
Y1 - 2018/5/1
N2 - A periodic character of the evolution of trap magmatism was inferred by many researchers from the fact that sequences of volcanic rocks consist of alternating units of lava flows and tuff. A new phase of studying magmatic rocks in the Siberian Platform was related to the possibility of apply high-precision geochemical techniques in studying trace elements and Sr, Nd, and Pb isotopic compositions. The use of these techniques made it possible not only to identify small individual cycles in the vertical sections of volcanic rocks but also to distinguish larger stages. The currently most widely acknowledged scenario of the origin of volcanic rocks involves three stages, during which oceanic-island basalts (OIB), transitional series (intermediate between OIB and WPB), and within-plate basalts (WPB) were formed. This scenario was inferred mostly from data on rocks in the western part of the Norilsk area (Kharaelakh Trough). This publication presents recently obtained data on the inner structure of the sequences of volcanic rocks and the geochemistry of basalts in the eastern part of the territory, where no rocks show transitional characteristics have ever been found. They can be classified into two types that have clearly different composition and occur in different areas. These types characterize two major stages of the origin of volcanic rocks: rift-related and trap magmatism itself. The rocks produced during these stages occur at neighboring territories.
AB - A periodic character of the evolution of trap magmatism was inferred by many researchers from the fact that sequences of volcanic rocks consist of alternating units of lava flows and tuff. A new phase of studying magmatic rocks in the Siberian Platform was related to the possibility of apply high-precision geochemical techniques in studying trace elements and Sr, Nd, and Pb isotopic compositions. The use of these techniques made it possible not only to identify small individual cycles in the vertical sections of volcanic rocks but also to distinguish larger stages. The currently most widely acknowledged scenario of the origin of volcanic rocks involves three stages, during which oceanic-island basalts (OIB), transitional series (intermediate between OIB and WPB), and within-plate basalts (WPB) were formed. This scenario was inferred mostly from data on rocks in the western part of the Norilsk area (Kharaelakh Trough). This publication presents recently obtained data on the inner structure of the sequences of volcanic rocks and the geochemistry of basalts in the eastern part of the territory, where no rocks show transitional characteristics have ever been found. They can be classified into two types that have clearly different composition and occur in different areas. These types characterize two major stages of the origin of volcanic rocks: rift-related and trap magmatism itself. The rocks produced during these stages occur at neighboring territories.
KW - magmatism
KW - Norilsk district
KW - Siberian Platform
KW - trace elements
KW - traps
UR - http://www.scopus.com/inward/record.url?scp=85046530962&partnerID=8YFLogxK
U2 - 10.1134/S0016702918050026
DO - 10.1134/S0016702918050026
M3 - Article
AN - SCOPUS:85046530962
VL - 56
SP - 419
EP - 437
JO - Geochemistry International
JF - Geochemistry International
SN - 0016-7029
IS - 5
ER -
ID: 13121496