Crust‐mantle boundary in the central Fennoscandian shield: Constraints from wide‐angle <i>P</i> and <i>S</i> wave velocity models and new results of reflection profiling in Finland

Janik, Tomasz; Kozlovskaya, Elena; Yliniemi, Juho

doi:10.1029/2006jb004681

Cited by 22 publications

(42 citation statements)

References 38 publications

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“…Existing data on experimentally studied lower crustal and mantle composition and 3-D structure derived from xenolith data, lithospheric thermal models Hieronymus et al, 2007) and seismic studies (Bruneton et al, 2004;Sandoval et al, 2004;Yliniemi et al, 2004;Hjelt et al, 2006;Pedersen et al, 2006;Plomerova et al, 2006;Janik et al, 2007;Olsson et al, 2007) should be utilized for forward rheological modelling of the lithosphere and for testing of dynamic uplift models. The presence and volume of fluids in the upper mantle and the influence of fluids on the mantle rheology is an open question.…”

Section: Evidence From Geophysical Observations Of Lithosphere Structurementioning

confidence: 99%

New Frontiers in Integrated Solid Earth Sciences

Cloetingh¹,

Negendank²

2010

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The book series is dedicated to the United Nations International Year of Planet Earth. The aim of the Year is to raise worldwide public and political awareness of the vast (but often under-used) potential of Earth sciences for improving the quality of life and safeguarding the planet. Geoscientific knowledge can save lives and protect property if threatened by natural disasters. Such knowledge is also needed to sustainably satisfy the growing need for Earth's resources by more people. Earths scientists are ready to contribute to a safer, healthier and more prosperous society. IYPE aims to develop a new generation of such experts to find new resources and to develop land more sustainably.

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Section: Evidence From Geophysical Observations Of Lithosphere Structurementioning

confidence: 99%

New Frontiers in Integrated Solid Earth Sciences

Cloetingh¹,

Negendank²

2010

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“…Existing data on experimentally studied lower crustal and mantle composition and 3-D structure derived from xenolith data, lithospheric thermal models Hieronymus et al, 2007) and seismic studies (Bruneton et al, 2004;Sandoval et al, 2004;Yliniemi et al, 2004;Hjelt et al, 2006;Pedersen et al, 2006;Plomerova et al, 2006;Gregersen et al, 2006;Janik et al, 2007;Olsson et al, 2007) should be utilized for forward rheological modelling of the lithosphere and for testing of dynamic uplift models. The presence and volume of fluids in the upper mantle and the influence of fluids on the mantle rheology is an open question.…”

Section: Evidence From Geophysical Observations Of Lithosphere Structurementioning

confidence: 99%

DynaQlim – Upper Mantle Dynamics and Quaternary Climate in Cratonic Areas

Poutanen

Dransch

Gregersen

et al. 2009

New Frontiers in Integrated Solid Earth Sciences

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The isostatic adjustment of the solid Earth to the glacial loading (GIA, Glacial Isostatic Adjustment) with its temporal signature offers a great opportunity to retrieve information of Earth's upper mantle to the changing mass of glaciers and ice sheets, which in turn is driven by variations in Quaternary climate. DynaQlim (Upper Mantle Dynamics and Quaternary Climate in Cratonic Areas) has its focus to study the relations between upper mantle dynamics, its composition and physical properties, temperature, rheology, and Quaternary climate. Its regional focus lies on the cratonic areas of northern Canada and Scandinavia.Geodetic methods like repeated precise levelling, tide gauges, high-resolution observations of recent movements, gravity change and monitoring of postglacial faults have given information on the GIA process for more than 100 years. They are accompanied by more recent techniques like GPS observations and the GRACE and GOCE satellite missions which provide additional global and regional constraints on the gravity field. Combining geodetic observations with seismological investigations, studies of the postglacial faults and continuum mechanical modelling of GIA, DynaQlim offers new insights into properties of the lithosphere. Another step toward a better understanding of GIA has been the joint inversion of different types of observational data -preferentially connected with geological relative sea-level evidence of the Earth's rebound during the last 10,000 years.Due to the changes in the lithospheric stress state large faults ruptured violently at the end of the last M. Poutanen ( ) Finnish Geodetic Institute, Geodeetinrinne 2, 02430 Masala, Finland e-mail: markku.poutanen@fgi.fi glaciation in large earthquakes, up to the magnitudes M W = 7-8. Whether the rebound stress is still able to trigger a significant fraction of intraplate seismic events in these regions is not completely understood due to the complexity and spatial heterogeneity of the regional stress field. Understanding of this mechanism is of societal importance.Glacial ice sheet dynamics are constrained by the coupled process of the deformation of the viscoelastic solid Earth, the ocean and climate variability. Exactly how the climate and oceans reorganize to sustain growth of ice sheets that ground to continents and shallow continental shelves is poorly understood. Incorporation of nonlinear feedback in modelling both ocean heat transport systems and atmospheric CO 2 is a major challenge. Climate-related loading cycles and episodes are expected to be important, hence also more shortterm features of palaeoclimate should be explicitly treated.

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“…The lithosphere structure of the central part of the Shield has been studied since 1980s and 1990s by controlled‐source deep seismic sounding profiles BALTIC, SVEKA'81, SVEKA'91, FENNIA, BABEL (Luosto et al 1984, 1990, 1994; Grad & Luosto 1987; BABEL Working Group 1990, 1993a,b; Sharov 1991; Yliniemi 1991; FENNIA Working Group 1998; Heikkinen & Luosto 2000). In 2001–2003 a new reflection seismic survey Finnish Reflection Experiment (FIRE), comprised four reflection seismic transects of total length of 2104 km (Kukkonen et al 2006; Janik et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Recently Musacchio et al (1997) and Janik et al (2007) demonstrated how analysis of S ‐wave velocities and V P / V S ratio in the crust and upper mantle can be used to infer compositional variations in the crust and to distinguish different types of crust–mantle transitions. However, their studies are limited to 2‐D models only.…”

Section: Introductionmentioning

confidence: 99%

Structure and composition of the crust and upper mantle of the Archean-Proterozoic boundary in the Fennoscandian shield obtained by joint inversion of receiver function and surface wave phase velocity of recording of the SVEKALAPKO array

Kozlovskaya¹,

Kosarev

Aleshin

et al. 2008

Geophysical Journal International

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S U M M A R YWe present a 3-D model of absolute values of S-wave velocities and V P /V S ratios in the crust and upper mantle beneath the SVEKALAPKO temporary seismic array that covered the transition zone between Archean and Proterozoic domains in the Precambrian Fennoscandian Shield. The model was obtained using joint inversion of P-wave receiver functions, Rayleigh phase velocities and traveltimes of waves converted from the 410 km discontinuity. P-wave receiver functions and traveltimes of Ps waves converted from the 410 km boundary were estimated for 30 broad-band stations of the SVEKALAPKO array and short-period, smallaperture RUKSA array in Russian Karelia. The phase velocities of Rayleigh waves were taken from previous surface wave studies (Bruneton et al. 2004a,b). For each station, the different data sets were merged and inverted by simulated annealing method. After that, a 3-D S-wave velocity model and distribution of V P /V S ratio was obtained from 1-D velocity models, using special interpolation technique. The new 3-D seismic model demonstrates pronounced lateral variations of values of V S and V P /V S ratio in the crust and uppermost mantle. The depth to the Moho boundary varies from 51 to 63 km in our model, which agrees with the results of previous controlled-source seismic studies in the region. The Moho boundary is overlain by a high-velocity lower crust (HVLC), with high V S , which is non-uniform in composition and origin. Our study showed no systematic correlation between the lithosphere structure and tectonothermal age of Archean and Proterozoic crustal terrains in the study area. The exposed Archean-Proterozoic suture (so-called Ladoga-Bothnian Bay Zone) is not observed as a mega-scale structure in the crust and upper mantle. Generally, the Archean-Proterozoic transition occupies a larger area in the lithosphere than it was thought earlier. It is marked by a Moho depression stretching to the North and by a zone of high V P and high V P /V S in the mantle. Our results supports the theory that the Fennoscandian Shield was assembled as a result of extensive collisional accretion of island arcs and microcontinental blocks and shows that these processes were working both in Archean and Proterozoic.

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Crust‐mantle boundary in the central Fennoscandian shield: Constraints from wide‐angle P and S wave velocity models and new results of reflection profiling in Finland

Cited by 22 publications

References 38 publications

New Frontiers in Integrated Solid Earth Sciences

New Frontiers in Integrated Solid Earth Sciences

DynaQlim – Upper Mantle Dynamics and Quaternary Climate in Cratonic Areas

Structure and composition of the crust and upper mantle of the Archean-Proterozoic boundary in the Fennoscandian shield obtained by joint inversion of receiver function and surface wave phase velocity of recording of the SVEKALAPKO array

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