Mineral Textures and Zoning as Evidence for Open System Processes

Streck, Martin J.

doi:10.2138/rmg.2008.69.15

Cited by 341 publications

(215 citation statements)

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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%

“…Interactions of discrete magma batches can result in disequilibrium features such as mineral dissolution and overgrowth rims on pre-existing crystals (Streck, 2008). In the following section we discuss the observed clinopyroxene textures and compositions to identify the open-system processes of magma recharge, crystal recycling and mingling.…”

Section: Magma Recharge Crystal Recycling and Minglingmentioning

confidence: 99%

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

confidence: 99%

Section: Magma Recharge Crystal Recycling and Minglingmentioning

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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“…Origin of the patchy areas has been discussed earlier, whilst sectorial texture in phenocrysts may result either from crystallisation in free spaces of skeletal crystals or from diffusional re-equilibration of crystals (Streck, 2008). A criterium to distinguish between the two possible origins is character of contact between 'sector/ patches': progressive contact is characteristic of diffusional reequilibration, meanwhile sharp contact marks filling the spaces in skeletal crystals (Streck, 2008).…”

Section: Type III Phenocrystsmentioning

confidence: 96%

“…Large amount of information on the evolution of magma is recorded by phenocrysts -larger crystals embedded in finer-grained matrix. Depending on the origin, the phenocrysts are classified as phenocrysts sensu stricto (growing in situ in the host magma), antecrysts (growing in magma which is genetically related with the host magma) and xenocrysts (having no relation to the host magma; Streck, 2008). Clinopyroxene and olivine are liquidus phases in the sodic alkaline magmas (olivine nephelinites and basanites; Bultitude & Green, 1971) under pressures typical of mantle spinel facies peridotites.…”

Section: Introductionmentioning

confidence: 99%

Clinopyroxene phenocrysts from the Księginki nephelinite (SW Poland)

et al. 2015

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RecordChemical composition and textures of clinopyroxene phenocrysts from Księginki nephelinite record complex history of melt reacting with mantle rocks and "in situ" crystallisation of the melt. AbstractThe Eocene nephelinite from Księginki quarry (SW Poland) contains five types of clinopyroxene phenocrysts varying by texture and chemical composition. Type I phenocrysts are formed of Mg-rich (mg# = 0.93-0.88) homogenous cores, patchy mantle and zoned rims. Abundant type II is less magnesian (mg# = 0.65-0.88) and consists of spongy or spongy-patchy core surrounded by zoned rims, whilst in type III (mg# = 0.69-0.84), the cores are massive but patchy. The mg# of cores of type IV phenocrysts is slightly lower than that of type I (0.79-0.89), but its cores are either massive or patchy. Type V is very scarce and consist of relatively Mg-poor (mg# = 0.75-0.77) core enveloped by nonpatchy, sometimes zoned mantle and zoned outer rim. Chemical composition of type I and type IV cores suggests that they are xenocrysts introduced into the nephelinite from disintegrated peridotite and clinopyroxenitic xenoliths, respectively. Type V is also of xenocrystic nature, but its source rock was significantly more evolved than mantlederived ones. Types II and III are possibly cognates from the host nephelinite or a melt related to the nephelinite. All the types of phenocrysts suffered from disequilibrium with the nephelinitic (or proto-nephelinitic) melt or dissolution during adiabatic uplift. Linear variation in chemical composition of phenocrysts of Księginki nephelinite suggests its evolution because of fractional crystallisation, without significant influence of other differentiation processes.

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“…The clinopyroxenes in the Hamsilos volcanic rocks (high-K calc-alkaline and shoshonitic rocks) show different types of disequilibrium textures, as zoning, resorbed, rounded crystals and embayed and breakdown clinopyroxenes megacryst (Figures 3 and 4). Clinopyroxenes are represented by rounded and embayed crystals similar to sieved plagioclase crystals that are generally caused by magma mixing (Hibbard, 1981;Simonetti Shore, Bell, 1996;Streck, 2008) or decompressional melting (Nelson & Montana, 1992). Normally zoned clinopyroxenes in the Hamsilos volcanic rocks represent more Mg-rich composition in the core compared to the rim coupled with higher Cr and lower Ti and Al contents (Figure 15(a) and (b)).…”

Section: Fractional Crystallisation and Assimilation Vs Magma Mixingmentioning

confidence: 99%

Subduction-related Late Cretaceous high-K volcanism in the Central Pontides orogenic belt: constraints on geodynamic implications

Aydınçakır

2016

Geodinamica Acta

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Mineral chemistry, major and trace elements, 40 Ar/ 39 Ar age and Sr-Nd-Pb isotopic data are presented for the Late Cretaceous Hamsilos volcanic rocks in the Central Pontides, Turkey. The Hamsilos volcanic rocks mainly consist of basalt, andesite and associated pyroclastics (volcanic breccia, vitric tuff and crystal tuff). They display shoshonitic and high-K calc-alkaline affinities. The shoshonitic rocks contain plagioclase, clinopyroxene, alkali feldspar, phlogopite, analcime, sanidine, olivine, apatite and titanomagnetite, whereas the high-K calc-alkaline rocks contain plagioclase, clinopyroxene, orthopyroxene, magnetite / titanomagnetite in microgranular porphyritic, hyalo-microlitic porphyritic and glomeroporphyritic matrix. Mineral chemistry data reveal that the pressure condition of the clinopyroxene crystallisation for the shoshonitic rocks are between 1.4 and 6.3 kbar corresponds to 6-18-km depth and the high-K calc-alkaline rocks are between 5 and 12 km. 40 Ar/ 39 Ar age data changing between 72 ± .5 Ma and 79.0 ± .3 Ma (Campanian) were determined for the Late Cretaceous Hamsilos volcanic rocks, contemporaneous with the subduction of the Neo-Tethyan Ocean beneath the Pontides. The studied volcanic rocks were enriched in the large-ion lithophile and light rare earth element contents, with pronounced depletion in the contents of high-field-strength elements. Chondrite-normalised rare earth element patterns (La N /Lu N = 6-17) show low to medium enrichment, indicating similar sources of the rock suite. Pb/ 204 Pb values between 37.839 and 38.427. The main solidification processes involved in the evolution of the volcanic rocks consist of fractional crystallisation, with minor amounts of crustal contamination ± magma mixing. According to geochemical evidence, the shoshonitic melts in the Hamsilos volcanic rocks were possibly derived from the low degree of partial melting of a subcontinental lithospheric mantle (SCLM), while the high-K calc-alkaline melts were derived from relatively high degree of partial melting of SCLM that was enriched by fluids and/or sediments from a subduction of oceanic crust.

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Mineral Textures and Zoning as Evidence for Open System Processes

Cited by 341 publications

References 90 publications

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

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

Clinopyroxene phenocrysts from the Księginki nephelinite (SW Poland)

Subduction-related Late Cretaceous high-K volcanism in the Central Pontides orogenic belt: constraints on geodynamic implications

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