A 'Three-Increase Model' for the Origin of the Marginal Reversal of the Koitelainen Layered Intrusion, Finland

Latypov, Rais; Hanski, Eero; Лавренчук, А. В.; Huhma, Hannu; Havela, T.

doi:10.1093/petrology/egr001

Cited by 30 publications

(28 citation statements)

References 33 publications

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“…In this context, a sharp compositional break between the marginal zone and Layered Series of the FHI (Figs 5-7) allows its interpretation as an aborted marginal reversal. This is the third example of an aborted marginal reversal that has been described so far from the layered intrusions (Latypov et al 2011;Egorova & Latypov, 2012).…”

Section: Discussionmentioning

confidence: 70%

“…As a result, the marginal reversal would stop forming, acquiring such characteristic features as an incomplete crystallization sequence and mineral compositional trends, as well as a sharp compositional break with the overlying rocks of the Layered Series. This type of marginal reversal is classified as an aborted reversal (Latypov et al 2011). In this context, a sharp compositional break between the marginal zone and Layered Series of the FHI (Figs 5-7) allows its interpretation as an aborted marginal reversal.…”

Section: Discussionmentioning

confidence: 99%

“…Examples include marginal reversals in dykes, sills and layered intrusions, as well as in basaltic pillows and komatiitic lava flows (e.g. Irvine, 1980;Alapieti, 1982;Raedeke & McCallum, 1984;Bédard, 1987;Campbell, 1987;Foland, Gibb & Henderson, 2000;Latypov, 2003a,b;Latypov, Chistyakova & Alapieti, 2007;Aarnes, Podladchikov & Neumann, 2008;Galerne et al 2010;Chistyakova & Latypov, 2009, 2010Latypov et al 2011). Such marginal reversals are almost universally developed in magmatic bodies, irrespective of their age, geographical location, size, form and even the composition of parental magmas, strongly indicating that some fundamental processes are involved in their genesis.…”

Section: Introductionmentioning

confidence: 99%

“…Gorring & Naslund, 1995) or prolonged (e.g. Morse, 1981;Latypov et al 2011) magma injections or compositional stratification in magma chambers (e.g. Wilson & Engell-Sørensen, 1986).…”

Section: Introductionmentioning

confidence: 99%

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Prolonged magma emplacement as a mechanism for the origin of the marginal reversal of the Fongen–Hyllingen layered intrusion, Norway

Egorova

Latypov

2012

Geol. Mag.

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The ∼ 100 m thick marginal zone of the Fongen-Hyllingen Intrusion (FHI) consists of non-layered, highly iron-enriched ferrodiorites that are overlain by a ∼ 6 km thick layered sequence of gabbroic to dioritic rocks of the Layered Series. From the base upwards the marginal zone becomes more primitive as exemplified by a significant increase in whole-rock MgO, Mg-number and normative An. The reverse trends are also evident from an upward increase in An-content of plagioclase (from ∼ 30 to ∼ 43 at. %) and Mg-number of amphibole (from ∼ 9 to ∼ 23 at. %) and clinopyroxene (from ∼ 23 to ∼ 33 at. %). The marginal zone is abruptly terminated at the contact with the overlying Layered Series as is evident from a step-like increase in Mg-number of mafic minerals and An-content of plagioclase, as well as a sharp increase in whole-rock MgO and Mg-number in overlying olivine gabbronorites of the Layered Series. Based on these features the marginal zone of the FHI can be interpreted as an aborted marginal reversal. Reverse trends in whole-rock and mineral compositions, as well as a sharp break in these parameters are indicative of its formation in an open system with the involvement of the prolonged emplacement of magma that became increasingly more primitive. Such development of the marginal reversal was interrupted by the emplacement of a major influx of more primitive magma that produced the Layered Series. The open system evolution of a basaltic magma chamber may represent a general mechanism for the origin of marginal reversals in mafic sills and layered intrusions.

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Section: Discussionmentioning

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Gorring & Naslund, 1995) or prolonged (e.g. Morse, 1981;Latypov et al 2011) magma injections or compositional stratification in magma chambers (e.g. Wilson & Engell-Sørensen, 1986).…”

Section: Introductionmentioning

confidence: 99%

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Prolonged magma emplacement as a mechanism for the origin of the marginal reversal of the Fongen–Hyllingen layered intrusion, Norway

Egorova

Latypov

2012

Geol. Mag.

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“…The basal contact has been intersected by a reverse circulation (RC) borehole (WPRCO-023, see Maier et al, 2014 for details). It is interpreted as intrusive because there is a well-defined, N 100 m wide basal compositional reversal that is characteristic of layered intrusions (Latypov et al, 2011). Overlying the contact is a 1-2 m thick zone consisting of hybrid, possibly contaminated gabbroic rocks (~10% MgO).…”

Section: Wingellina Hillsmentioning

confidence: 99%

Magmatic ore deposits in mafic–ultramafic intrusions of the Giles Event, Western Australia

Maier

Howard

Smithies

et al. 2015

Ore Geology Reviews

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More than 20 layered intrusions were emplaced at c. 1075 Ma across N100 000 km 2 in the Mesoproterozoic Over a time span of N200 my, the Musgrave Province was affected by near continuous high-temperature reworking under a primarily extensional regime. This began with the 1220-1150 Ma intracratonic Musgrave Orogeny, characterized by ponding of basalt at the base of the lithosphere, melting of lower crust, voluminous granite magmatism, and widespread and near-continuous, mid-crustal ultra-high-temperature (UHT) metamorphism. Direct ascent of basic magmas into the upper crust was inhibited by the ductile nature of the lower crust and the development of substantial crystal-rich magma storage chambers. In the period between c. 1150 and 1090 Ma magmatism ceased, possibly because the lower crust had become too refractory, but mid-crustal reworking was continuously recorded in the crystallization of zircon in anatectic melts. Renewed magmatism in the form of the Giles Event of the Warakurna LIP began at around 1090 Ma and was characterized by voluminous basic and felsic volcanic and intrusive rocks grouped into the Warakurna Supersuite. Of particular interest in the context of the present study are the Giles layered intrusions which were emplaced into localized extensional zones. Rifting, emplacement of the layered intrusions, and significant uplift all occurred between 1078 and 1075 Ma, but mantle-derived magmatism lasted for N50 m.y., with no time progressive geographical trend, suggesting that magmatism was unrelated to a deep mantle plume, but instead controlled by plate architecture. The Giles layered intrusions and their immediate host rocks are considered to be prospective for (i) platinum-group element (PGE) reefs in the ultramafic-mafic transition zones of the intrusions, and in magnetite layers of their upper portions, (ii) Cu-Ni sulfide deposits hosted within magma feeder conduits of late basaltic pulses, (iii) vanadium in the lowermost magnetite layers of the most fractionated intrusions, (iv) apatite in unexposed magnetite layers towards the evolved top of some layered intrusions, (v) ilmenite as granular disseminated grains within the upper portions of the intrusions, (vi) iron in tectonically thickened magnetite layers or magnetite pipes of the upper portions of intrusions, (vii) gold and copper in the roof rocks and contact aureoles of the large intrusions, and (viii) lateritic nickel in weathered portions of olivine-rich ultramafic intrusions.

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3.4 Evolution of the Palaeoproterozoic (2.50–1.95 Ga) Non-orogenic Magmatism in the Eastern Part of the Fennoscandian Shield

Hanski

2012

Frontiers in Earth Sciences

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A 'Three-Increase Model' for the Origin of the Marginal Reversal of the Koitelainen Layered Intrusion, Finland

Cited by 30 publications

References 33 publications

Prolonged magma emplacement as a mechanism for the origin of the marginal reversal of the Fongen–Hyllingen layered intrusion, Norway

Prolonged magma emplacement as a mechanism for the origin of the marginal reversal of the Fongen–Hyllingen layered intrusion, Norway

Magmatic ore deposits in mafic–ultramafic intrusions of the Giles Event, Western Australia

3.4 Evolution of the Palaeoproterozoic (2.50–1.95 Ga) Non-orogenic Magmatism in the Eastern Part of the Fennoscandian Shield

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