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The 1501 Ma Kuonamk...
The 1501 Ma Kuonamka Large Igneous Province of northern Siberia : U-Pb geochronology, geochemistry, and links with coeval magmatism on other crustal blocks
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- Ernst, R. E. (författare)
- Tomsk State University,Carleton University
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- Okrugin, A. V. (författare)
- Diamond and Precious Metal Geology Institute of the Siberian Branch Of The Russian Academy Of Sciences
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- Veselovskiy, R. V. (författare)
- Lomonosov Moscow State University,P.N. Lebedev Physical Institute of the Russian Academy of Sciences
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- Kamo, S. L. (författare)
- University of Toronto
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- Hamilton, Michael A. (författare)
- University of Toronto
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- Pavlov, V. (författare)
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences,Kazan Federal University
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- Soderlund, U. (författare)
- Lund University,Lunds universitet,Geologiska institutionen,Naturvetenskapliga fakulteten,Department of Geology,Faculty of Science
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- Chamberlain, Kevin R. (författare)
- University of Wyoming
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- Rogers, Chad N (författare)
- Carleton University
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(creator_code:org_t)
- GeoScienceWorld, 2016
- 2016
- Engelska 19 s.
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Ingår i: Russian Geology and Geophysics. - : GeoScienceWorld. - 1068-7971. ; 57:5, s. 653-671
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A new large igneous province (LIP), the 1501 ± 3 Ma Kuonamka LIP, extends across 700 km of northern Siberia and is linked with coeval dikes and sills in the formerly attached Sao Francisco craton (SFC)-Congo craton to yield a short-duration event 2000 km across. The age of the Kuonamka LIP can be summarized as 1501 ± 3 Ma (95% confidence), based on 7 U-Pb ID-TIMS ages (6 new herein) from dolerite dikes and sills across the Anabar shield and within western Riphean cover rocks for a distance of 270 km. An additional sill yielded a SIMS (CAMECA) age of 1483 ± 17 Ma and sill in the Olenek uplift several hundred kilometers farther east, a previous SIMS (SHRIMP) age of ca. 1473 Ma was obtained on a sill; both SIMS ages are within the age uncertainty of the ID-TIMS ages. Geochemical data indicate a tholeiitic basalt composition with low MgO (4-7 wt%) within-plate character based on trace element classification diagrams and source between E-MORB and OIB with only minor contamination from crust or metasomatized lithospheric mantle. Two subgroups are distinguished: Group 1 has gently sloping LREE ((La/Sm)PM = 1.9) and HREE ((Gd/Yb)PM = 1.8) patterns, slightly negative Sr and moderate TiO2 (2.2 wt%), and Group 2 has steeper LREE ((La/Sm)PM = 2.3) and HREE ((Gd/Yb)PM = 2.3), strong negative Sr anomaly, is higher in TiO2 (2.7 wt%), and is transitional from tholeiitic to weakly alkaline in composition. The slight differences in REE slopes are consistent with Group 2 on average melting at deeper levels. Proposed reconstructions of the Kuonamka LIP with 1500 Ma magmatism of the SFC-Congo craton are supported by a geochemical comparison. Specifically, the chemistry of the Chapada Diamantina and Curaga dikes of the SFC can be linked to that of Groups 1 and 2, respectively, of the Kuonamka LIP and are consistent with a common mantle source between EMORB and OIB and subsequent differentiation history. However, the coeval Humpata sills and dikes of the Angola block of the Congo craton represent a different magma batch.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Dikes
- Igneous province
- Magmatism
- Northern Siberia
- Sills
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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