Research output: Contribution to journal › Article › peer-review
Thermochronology and Exhumation History of the Northeastern Fennoscandian Shield Since 1.9 Ga : Evidence From 40Ar/39Ar and Apatite Fission Track Data From the Kola Peninsula. / Veselovskiy, Roman V.; Thomson, Stuart N.; Arzamastsev, Andrey A. et al.
In: Tectonics, Vol. 38, No. 7, 07.2019, p. 2317-2337.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Thermochronology and Exhumation History of the Northeastern Fennoscandian Shield Since 1.9 Ga
T2 - Evidence From 40Ar/39Ar and Apatite Fission Track Data From the Kola Peninsula
AU - Veselovskiy, Roman V.
AU - Thomson, Stuart N.
AU - Arzamastsev, Andrey A.
AU - Botsyun, Svetlana
AU - Travin, Aleksey V.
AU - Yudin, Denis S.
AU - Samsonov, Alexander V.
AU - Stepanova, Alexandra V.
PY - 2019/7
Y1 - 2019/7
N2 - Results from thermochronological studies have multiple applications to various problems in tectonics and landform evolution. However, up to now a lack of thermochronological data from the northeastern Fennoscandian Shield has complicated the interpretation of tectonothermal evolution of the region. Here, we use both new and previously published multimineral 40Ar/39Ar data (amphibole, mica, and feldspar) on the various Precambrian magmatic and metamorphic complexes to reconstruct the thermal history of NE Fennoscandia within the Kola Peninsula area in the interval 1900–360 Ma. Using the apatite fission track method as well as a numerical model of the heating-cooling process of northeastern Fennoscandia's upper crust, we have reconstructed its thermal evolution for the interval 360–0 Ma. According to our model, since Lapland-Kola orogenesis (1930–1905 Ma) northeastern Fennoscandia experienced a quasi-monotonous cooling with the average rate of ~0.15 °C/Myr, which is equal to an exhumation rate of ~1–2 m/Myr. New apatite fission track data and time-temperature modeling reveal a “hidden” endogenous thermal event in the NE Fennoscandia that took place between 360 and 300 Ma. This we attribute to an elevated geothermal gradient due to Baltica's drift over the African large low shear-wave velocity province in the lowest mantle and/or thermal blanketing by insulating Devonian-Carboniferous sedimentary/volcanic cover. Our model is further supported by evidence of Late Devonian-Carboniferous rifting in the East and South-Western Barents Basin, as well as various 360–300 Ma magmatic events within SW Fennoscandia and the Baltic countries.
AB - Results from thermochronological studies have multiple applications to various problems in tectonics and landform evolution. However, up to now a lack of thermochronological data from the northeastern Fennoscandian Shield has complicated the interpretation of tectonothermal evolution of the region. Here, we use both new and previously published multimineral 40Ar/39Ar data (amphibole, mica, and feldspar) on the various Precambrian magmatic and metamorphic complexes to reconstruct the thermal history of NE Fennoscandia within the Kola Peninsula area in the interval 1900–360 Ma. Using the apatite fission track method as well as a numerical model of the heating-cooling process of northeastern Fennoscandia's upper crust, we have reconstructed its thermal evolution for the interval 360–0 Ma. According to our model, since Lapland-Kola orogenesis (1930–1905 Ma) northeastern Fennoscandia experienced a quasi-monotonous cooling with the average rate of ~0.15 °C/Myr, which is equal to an exhumation rate of ~1–2 m/Myr. New apatite fission track data and time-temperature modeling reveal a “hidden” endogenous thermal event in the NE Fennoscandia that took place between 360 and 300 Ma. This we attribute to an elevated geothermal gradient due to Baltica's drift over the African large low shear-wave velocity province in the lowest mantle and/or thermal blanketing by insulating Devonian-Carboniferous sedimentary/volcanic cover. Our model is further supported by evidence of Late Devonian-Carboniferous rifting in the East and South-Western Barents Basin, as well as various 360–300 Ma magmatic events within SW Fennoscandia and the Baltic countries.
KW - apatite fission track
KW - Ar/Ar dating
KW - Fennoscandia
KW - Kola Peninsula
KW - tectonics
KW - thermal history
KW - COMPLEX
KW - RUSSIA IMPLICATIONS
KW - Ar dating
KW - CALEDONIAN FORELAND BASIN
KW - ROCKS
KW - ALKALINE-PROVINCE
KW - MAGMATISM
KW - U-PB
KW - GEOCHRONOLOGY
KW - Ar
KW - THERMAL MATURATION
KW - AGE
UR - http://www.scopus.com/inward/record.url?scp=85069906307&partnerID=8YFLogxK
U2 - 10.1029/2018TC005250
DO - 10.1029/2018TC005250
M3 - Article
AN - SCOPUS:85069906307
VL - 38
SP - 2317
EP - 2337
JO - Tectonics
JF - Tectonics
SN - 0278-7407
IS - 7
ER -
ID: 21144870