Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Markku Väisänen"'
Publikováno v:
Iraqi Geological Journal, Vol 55, Iss 2F, Pp 16-42 (2022)
New geochemical data were presented for the mafic (basalts and gabbros) and ultramafic (dunites, serpentinites and pyroxenites) rocks from the Mawat ophiolite exposed in the Zagros suture zone in northeastern Iraq. The mantle section of the ophiolite
Externí odkaz:
https://doaj.org/article/2a0b3a8fa40446a3aa6ca68cbb05dc68
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 94, Iss 2, Pp 109-118 (2022)
The E-MORB type Haveri basalt differs from the volcanic arc type rocks in the Tampere belt showing no subduction signature. It is considered to have formed in a marginal basin prior to the volcanic arc. We present here zircon U-Pb dating on two sam
Externí odkaz:
https://doaj.org/article/eaeefd94ae6c4e21a8d3f625f9a63e8a
Autor:
Heider Al Humadi, Markku Väisänen, Sabah A. Ismail, Jaakko Kara, Hugh O'Brien, Yann Lahaye, Marja Lehtonen
Publikováno v:
Heliyon, Vol 5, Iss 11, Pp e02721- (2019)
The Mawat ophiolite, NE Iraq, is one of the Neo-Tethyan ophiolites within the Iraqi Zagros orogen. It consists of many metre-to kilometre-sized tectonic slices of serpentinized dunite, peridotite, gabbro, basaltic rocks and associated oceanic metased
Externí odkaz:
https://doaj.org/article/1d78f4a2195d404886cfcb748323aa7d
Arclogites, i.e., lower crustal gamet-pyroxenite cumulates, are suggested to play an important role in controlling magma differentiation in modem continental arcs. Until now, arclogite-related magmatism has only been described from the Phanerozoic Er
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ced882e075cef41cd3a2fec768e5cfaa
http://hdl.handle.net/10138/346369
http://hdl.handle.net/10138/346369
Autor:
Pietari Skyttä, Markku Väisänen, Hanna Leväniemi, Jaakko Kara, Markku Tiainen, Yann Lahaye, Tuomas Leskelä
Publikováno v:
Precambrian Research. 364:106364
We characterise the geochemistry, zircon Lu-Hf composition, age and the structure of the Uunimaki gabbro (UGB) in south-western Finland to improve the understanding of i) the early Svecofennian (1.92–1.89 Ga) crustal evolution of the central Fennos
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 86, Iss 2, Pp 93-112 (2014)
Using single-grain zircon U-Pb dating by LA-MC-ICPMS and whole-rock geochemistry, we have studied the Palaeoproterozoic gabbroic rocks from Moisio in southwest Finland. Three ages were obtained. The interpreted intrusion age is ~1.86 Ga, which places
Effect of reduced pulp xylan content on wet end chemistry and paper properties — a pilot scale study
Publikováno v:
February 2014. 13:29-37
In this scale-up study, we examined the effects of using varying amounts of fibers with reduced xylan content in paper. Bleached birch kraft pulp was partially or fully replaced by alkali-extracted pulp, and the effects of this replacement on the wet
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 88, Iss 2, Pp 85-103 (2016)
Because of the relatively low metamorphic grade, low strain and well-preserved early structures in volcanic and volcaniclastic rocks, the Orijärvi triangle (in the center of the larger Orijärvi area) is one of the few locations in the Svecofennian
Autor:
Marjaana Lammi, Olav Eklund, Sören Fröjdö, Yann Lahaye, Hugh O’Brien, Markku Väisänen, Karin Högdahl
Publikováno v:
GFF. 134(2):99-114
We have studied plutonic rocks from the Korpo and Rauma areas of south-western Finland which can be categorized as intra-orogenic, i.e. they were intruded during a proposed extensional period betwe ...
Autor:
Henrikki Rutanen, Olav Eklund, Ulf B. Andersson, Markku Väisänen, Åke Johansson, Yann Lahaye, Sören Fröjdö
Publikováno v:
International Geology Review. 53:1622-1683
Whole-rock and isotope geochemistry of six ∼1.8 Ga post-kinematic intrusions, emplaced along the ∼1.9 Ga Southern Svecofennian Arc Complex (SSAC) and in the SW part of the Karelian Domain in Finland, was studied. The intrusive age [U–Pb seconda