Hallandian 1.45Ga high-temperature metamorphism in Baltica: P–T evolution and SIMS U–Pb zircon ages of aluminous gneisses, SW Sweden

Ulmius, Jan; Andersson, Jenny; Möller, Charlotte

doi:10.1016/j.precamres.2015.04.004

Cited by 35 publications

(16 citation statements)

References 109 publications

(157 reference statements)

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“…West of the MZ are mainly calcalkaline belts, formed and variously reworked during the 1.66–1.52 Ga Gothian, and 1.52–1.47 Ga Telemarkian, accretionary orogenies (Bingen, Andersson, et al., ). East of the MZ are alkali–calcic rocks of the 1.87–1.66 Ga Transscandinavian Igneous Belt, in the south locally overprinted by 1.47–1.38 Ga metamorphism and associated magmatism during Hallandian orogenesis (Ulmius et al., ). The Sveconorwegian evolutions of the western Sveconorwegian terranes and the Eastern Segment are distinctly different. Although the western terranes were metamorphosed during a main Sveconorwegian stage beginning at 1.05 Ga (Bingen, Nordgulen, et al., ) and progressing for c .…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…Mesoproterozoic intrusions are subordinate and include 1.57-1.56 Ga gabbro, and 1.47-1.38 Ga and 1.24-1.18 Ga granite, monzonite, gabbro and anorthosite (Brander & S€ oderlund, 2009;S€ oderlund & Ask, 2006;S€ oderlund et al, 2005). The southernmost Baltic Shield, including the southern Eastern Segment, also records low-P metamorphism, partial melting, and leucogranitic dyke intrusion at 1.47-1.38 Ga (Brander, Appelqvist, Cornell, & Andersson, 2012;S€ oderlund, M€ oller, Andersson, Johansson, & Whitehouse, 2002;Ulmius, Andersson, & M€ oller, 2015).…”

Section: The Sveconorwegian Orogenmentioning

confidence: 99%

“…West of the MZ are mainly calcalkaline belts, formed and variously reworked during the 1.66-1.52 Ga Gothian, and 1.52-1.47 Ga Telemarkian, accretionary orogenies (Bingen, Andersson, et al, 2008). East of the MZ are alkali-calcic rocks of the 1.87-1.66 Ga Transscandinavian Igneous Belt, in the south locally overprinted by 1.47-1.38 Ga metamorphism and associated magmatism during Hallandian orogenesis (Ulmius et al, 2015). 2.…”

Section: The Relation Between the Lower And Upper Platesmentioning

confidence: 99%

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Metamorphic zoning and behaviour of an underthrusting continental plate

Möller

Andersson

2018

Journal Metamorphic Geology

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Lower continental plates of collision zones are normally inaccessible and their properties inferred by geophysical surveying. By contrast, the eastern margin of the deeply eroded 1‐billion‐year‐old Sveconorwegian Orogen in Scandinavia exposes an underthrusting lower continental plate that records the metamorphic evolution and behaviour during collisional orogeny. A 200 km wide structurally coherent belt of the mid‐ to upper levels of the underthrusting lower plate, composed of Proterozoic igneous protoliths, exposes the gradual transition from unmetamorphosed to high‐P granulite facies. Metamorphic assemblages in Fe–Ti‐rich metagabbro in a continuous ~120 km wide transect across the lower continental plate define a regional metamorphic zoning by eight zones. Significant metamorphic recrystallization is first recorded at conditions of lower to middle amphibolite facies (550–600°C), progressing successively towards the contact with the upper plate to high‐P granulite facies at ~850°C and 10–11 kbar, the latter corresponding to ~40 km depth. An eclogite‐bearing tectonic terrane, detached from the leading edge of the underthrusting plate and extruded back along the interface with the overlying crust, occurs just beneath the lithotectonic contact of the overriding plate. The gradual metamorphic transition demonstrates that, with the exception of the eclogite‐bearing terrane, the underthrusting plate remained essentially structurally coherent despite highly ductile deformation and partial melting. The metamorphic rocks record that, by and large, the underthrusting plate underwent short‐lived metamorphic recrystallization and deformation that started first at an advanced stage of collision, at c. 980–970 Ma; this is in contrast to the eclogite‐bearing terrane which records more protracted metamorphic recrystallization both through prograde metamorphism and decompression. The investigated section is the first described in situ exposure of a coherent underthrusting lower continental plate, and defines a metamorphic field gradient at higher temperatures and P/T than the classical Barrovian style. The exposed section provides potential for increasing understanding of the thermal evolution, rheology, petrophysical properties and distribution of volatiles in an elsewhere inaccessible part of Earth's collisional systems. The data demonstrate that the underthrusting lower continental plate differs in metamorphic character from other parts of orogenic systems in that the crust is relatively dry, competent and responds by significant metamorphic recrystallization first at elevated temperatures (middle amphibolite facies) and that metamorphic recrystallization is largely coupled to deformation that facilitates the entry of hydrous fluids into the crust.

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Section: Interpretation and Discussionmentioning

confidence: 99%

Section: The Sveconorwegian Orogenmentioning

confidence: 99%

Section: The Relation Between the Lower And Upper Platesmentioning

confidence: 99%

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Metamorphic zoning and behaviour of an underthrusting continental plate

Möller

Andersson

2018

Journal Metamorphic Geology

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“…Между 1.5 и 1.4 млрд лет кора вдоль за-падной окраины Восточно-Европейского кратона подверглась интенсивной мигматизации и мета-морфизму -для этих событий было предложено наименование Данополонской орогении [Bogdanova et al, 2008; и ссылки там же]. Мафит-чарнокит-гранитный магматизм и метаморфизм амфиболи-товой и гранулитовой фации (Галландийское собы-тие) датирован 1.47-1.38 млрд лет [Christoffel et al, 1999;Ulmius et al, 2015]. Последовавшие вскоре внедрения мафитовых даек, бимодальный магма-тизм и эпиплатформенное осадконакопление (1.4 и 1.2 млрд лет) указывают на условия внутрикон-тинентального растяжения [Ǻhäll, Connely, 1998].…”

Section: формирование гсно (геодинамика осадконакопление магматизмunclassified

Meso-Neoproterozoic Grenville-Sveconorwegian intracontinental orogen: history, tectonics, geodynamics

Mints¹

2017

Geodyn. Tectonophys.

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Abstract:The objective of this paper is to represent the main features inherent to Grenville-Sveconorwegian Orogen (GSNO) and to propose a model of tectonic and geodynamic evolution of this orogen based on the results of research concerning similar Precambrian tectonic units in the East European Craton. The studies of the conditions and settings related to origin and evolution of GSNO are of special interest, because it is located geographicaly and in a certain sense ideologically in the center of Rodinia, a supposed Neoproterozoic supercontinent. GSNO originated in the MezoNeoproterozoic in the inner region of the Lauroscandia continent. At present, the synformal tectonic structure of GSNO is divided into two portions: Grenville sector along the southeastern margin of the Canadian Shield, and Sveconorwegian sector in the southwestern Scandinavia. The integrity of Lauroscandia was twice disturbed in the MezoNeoproterozoic when oceanic structures resembling the Atlantic Ocean were formed. Later on, the continuity of the continent was restored with the involvement of oceanic lithosphere subduction and accretion and obduction of the island-arc and oceanic terranes. We distinguish two stages in the GSNO history: (1) 'preparatory' stage (from ~1.90 to ~1.16 Ga), and (2) formation of GSNO proper (from ~1.19 to ~0.90 Ga). The manifestations of granulite-facies metamorphism were repeatedly recorded before the Grenville Orogeny at 1.67-1.66, 1.47-1.45, 1.37-1.35, and 1.20-1.18 Ga. The Ottawan stage of the Grenville metamorphism proper is dated between 1.16 and 1.05-1.03 Ga. Metamorphism at the base of Allochthonous Belt corresponds to high-pressure granulite facies and, in a number of places, to hightemperature eclogite facies (800-900 °C at pressure in the range between 14 and 20 kbar). The age of metamorphism of rocks within Paraautochthonous Belt is 1.05-0.95 Ga; metamorphic grade increases from the greenschist facies near the Grenville front to the high-pressure amphibolite facies near Allochthon Boundary Thrust showing an inverted metamorphic zoning. High-pressure granulite-facies metamorphism is characteristic of Sveconorwegian sector; and high-temperature eclogites are observed locally at the base of the allochthonous complexes and within the paraautochthonous complexes. A distinctive feature of GNSO is the abundant occurrence of specific intrusive magmatism. Massifs of anorthosite-mangerite-charnockite-granite (AMCG) and anorthosite-rapakivi granite (ARG) complexes formed 1.8-1.5 Ga ago frame the orogen as a wide arc. In the internal region of GSNO, these complexes were formed successively at 1.16-1.13, 1.09-1.05, 0.99-0.96, and 0.93-0.92 Ga. Later on, after the intrusion, the massifs unevenly underwent granulite-facies metamorphism. The high-temperature magmatism and metamorphism, numerous repeated thermal pulses and enormous crustal body that underwent high-temperature transformation point to a mantle plume as the most adequate source of thermal energy. The model of intracontinental development of GSNO comes

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“…Brander & Söderlund 2009;Ulmius et al, 2015). Collectively the Mesoproterozoic activity is intrusive into a proposed Paleoproterozoic, global-scale orogen known as YavapaiPenokean-Svecofennian orogeny (cf.…”

Section: Intraplate Events (144 -142 and 139 Ga): Global Implicationsmentioning

confidence: 99%