The influence of crystal settling on the compositional zoning of a thin lamprophyre sill: A multi-method approach

Ubide, Teresa; Arranz, Enrique; Lago, M.; Galé, Carlos; Larrea, Patricia

doi:10.1016/j.lithos.2011.11.012

Cited by 41 publications

(21 citation statements)

References 49 publications

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“…%; Al 2 O 3 <13.6 wt. %), similar to the amphiboles of the Monteregian (Bédard, 1988), Tamazert (Bouabdli et al, 1988), Pyrenean (Azambré et al, 1992), Moravian-Silesian, Mecsek-Alföld (Harangi et al, 2003) and Catalonian (Ubide et al, 2012) lamprophyres. Compositional trends for kaersutites are consistent with early crystallisation from Si-undersaturated magma (Bédard, 1988;Giret et al, 1980 (Adam and Green, 1994).…”

Section: Amphibolementioning

confidence: 58%

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Petrogenetic significance of ocellar camptonite dykes in the Ditrău Alkaline Massif, Romania

Batki

Pál-Molnár

Dobosi

et al. 2014

Lithos

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Camptonite dykes intrude the rift-related Mesozoic igneous body of the Ditrău Alkaline Massif, Eastern Carpathians, Romania. We present and discuss mineral chemical data, major and trace elements, and the Nd isotopic compositions of the dykes in order to define their nature and origin. The dykes are classified as the clinopyroxene-bearing (camptonite-I) and clinopyroxene-free (camptonite-II) varieties. Camptonite-I consists of aluminian-ferroan diopside phenocrysts accompanied by kaersutite, subordinate Ti-rich annite, albite to oligoclase and abundant calcite-albite ocelli. Camptonite-II comprises K-rich hastingsite to magnesiohastingsite, Ti-rich annite, albite to andesine, abundant accessory titanite and apatite, and silicate ocelli filled mainly with plagioclase (An 4-34 ). A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Section: Amphibolementioning

confidence: 58%

“…content also confirm that they probably crystallised under higher pressure and temperature (e.g. Adam and Green, 1994;Ubide et al, 2012). Based on the high mg# and Cr content (up to 0.81 wt.…”

Section: Accepted M Manuscriptmentioning

confidence: 64%

Petrogenetic significance of ocellar camptonite dykes in the Ditrău Alkaline Massif, Romania

Batki

Pál-Molnár

Dobosi

et al. 2014

Lithos

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“…minerals that were not crystallized from the host magma, but having a genetic linkage to the same magmatic system (Charlier 2005;Davidson et al 2007;Ubide et al 2012;Larrea et al 2012). They could represent recycled crystals of earlier stages of the magmatic system at depth.…”

Section: Discussionmentioning

confidence: 99%

The antecryst compositional influence on Cretaceous alkaline lamprophyre dykes, SE Brazil

et al. 2015

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ABSTRACT:The question of whether the antecryst assemblage affects the bulk composition of lamprophyre dykes, and could be responsible for the compositional zonation between their centers and borders is addressed through a detailed study involving four monchiquite and camptonite dykes (basanites and tephrites) representative of the Arco de Ponta Grossa and Serra do Mar alkaline provinces. In them, antecrysts are interpreted as early-crystallized minerals that are no longer in equilibrium with their host-liquid, albeit still linked to the same magmatic system. They represent recycled crystals of earlier stages of the magmatic system at depth. The antecryst microtextures, such as zoned clinopyroxene megacrysts (augite cores and titanaugite rims) with partly corroded cores, olivine crystals with corroded rims surrounded by biotite coronas, chrome-spinel inclusions in clinopyroxene and olivine megacryst cores, and titanomagnetite crystals surrounded by biotite coronas, suggest chemical re-equilibrium with the matrix. The greatest antecryst cargo in these dykes is found in their centers. After subtracting the antecryst volume from the center analyses of each body, the calculated compositions are very similar to the border analyses. The mafic antecryst cargo of each occurrence proportionally leads to enrichment of MgO, FeO, TiO 2 , CaO, compatible trace elements (Cr, Ni and Co), and depletion of SiO 2 , K 2 O, Na 2 O, Al 2 O 3 and incompatible trace elements (Ba, Sr and REE). The whole-rock geochemical analyses of each dyke represent the combination of accumulated crystals and melt. The compositional zonation of the studied dykes is associated with the antecryst cargo rather than different magmatic pulses. KEYWORDS:Antecrysts; Alkaline lamprophyres; Petrology; Geochemistry. RESUMO: A questão de como a assembleia de antecristais influencia a composição química de diques de lamprófiro e se esta pode ser responsável pelo zoneamento composicional entre núcleos e bordas é abordada por meio de um estudo detalhado em quatro diques de monchiquito e camptonito, representativos das províncias alcalinas Arco de Ponta Grossa e Serra do Mar. Nestes diques, os antecristais são interpretados como minerais cristalizados precocemente que não se encontram mais em equi-

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“…10b, c) by Pál-Molnár et al (2015b). The term 'phenocryst' is used to phases which are in equilibrium with the host melt (e.g., Cox et al, 1979;Streck, 2008), whilst 'antecrysts' are defined as crystals did not crystallise directly from the magma in which they are now hosted but represent crystals recycled by other magmas related to the same magmatic system (e.g., Charlier et al, 2005;Davidson et al, 2007;Streck, 2008;Francalanci et al, 2012;Ubide et al, 2012Ubide et al, , 2014a. In tinguaite and ijolite, the partially resorbed appearance of the crystal cores in the pale brown macro-and microcrysts (Figs.…”

Section: Origin Of the Primitive Diopside Crystals (Type 1)mentioning

confidence: 99%

Insights into the evolution of an alkaline magmatic system: An in situ trace element study of clinopyroxenes from the Ditrău Alkaline Massif, Romania

Batki

Pál-Molnár

Jankovics

et al. 2018

Lithos

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Clinopyroxene is a major constituent in most igneous rock types (hornblendite, diorite, containing phonolitic (tinguaite) magma. This study shows that antecryst recycling, also described for the first time in Ditrău, is a significant process during magma recharge and demonstrates that incorporated crystals can crucially affect the host magma composition and so whole-rock chemical data should be interpreted with great care.

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The influence of crystal settling on the compositional zoning of a thin lamprophyre sill: A multi-method approach

Cited by 41 publications

References 49 publications

Petrogenetic significance of ocellar camptonite dykes in the Ditrău Alkaline Massif, Romania

Petrogenetic significance of ocellar camptonite dykes in the Ditrău Alkaline Massif, Romania

The antecryst compositional influence on Cretaceous alkaline lamprophyre dykes, SE Brazil

Insights into the evolution of an alkaline magmatic system: An in situ trace element study of clinopyroxenes from the Ditrău Alkaline Massif, Romania

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