Pre-Mesozoic Geology in the Alps

Raumer, Jürgen F. von; Neubauer, Franz

doi:10.1007/978-3-642-84640-3

Cited by 66 publications

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“…However, it is compositionally and microstructurally similar to STR77 sampled within the upper amphibolite zone. This is in agreement with the amphibolite zone proposed by Schmid (1993), suggesting the transition zone is more restricted (Figure 1d) than proposed by Redler et al (2012). An important accessory mineral is graphite, which occurs not only in the matrix (Figure 3a,b) together with ilmenite, apatite, tourmaline, zircon, and monazite, but also as inclusions in garnet, plagioclase, and biotite (Figure 3c,d).…”

Section: Samples and Petrographysupporting

confidence: 88%

“…The Mafic Complex comprises gabbroic, noritic, and dioritic rocks that intruded the metasedimentary sequences of the Kinzigite Formation (Quick et al, 2003;Sinigoi et al, 1994). The Kinzigite Formation is mainly composed of metapelites, interlayered with metagreywackes, metabasites, and minor marbles and quartzites (Barboza & Bergantz, 2000;Quick et al, 2003;Schmid, 1993).…”

Section: Geological Settingmentioning

confidence: 99%

“…Metapelites of the Kinzigite Formation show an increase in metamorphic grade from amphibolite facies in the SE to granulite facies in the NW (Henk, Franz, Teufel, & Oncken, 1997;Schmid, 1993;Schmid & Wood, 1976). Some studies have used the term "kinzigite" for amphibolite facies rocks and "stronalite" for rocks preserving a granulite facies assemblage (Bea & Montero, 1999;Schnetger, 1994).…”

Section: Geological Settingmentioning

confidence: 99%

“…(c) Extension of metamorphic zones as described in Redler et al (2012). (d) Extension of metamorphic zones as described by Schmid (1993). A = amphibolite facies; Tr = transition zone; G = granulite facies CARVALHO ET AL.…”

Section: Geological Settingmentioning

confidence: 99%

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Anatexis and fluid regime of the deep continental crust: New clues from melt and fluid inclusions in metapelitic migmatites from Ivrea Zone (NW Italy)

Carvalho

Bartoli

Ferri

et al. 2018

Journal Metamorphic Geology

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We investigate the inclusions hosted in peritectic garnet from metapelitic migmatites of the Kinzigite Formation (Ivrea Zone, NW Italy) to evaluate the starting composition of the anatectic melt and fluid regime during anatexis throughout the upper amphibolite facies, transition, and granulite facies zones. Inclusions have negative crystal shapes, sizes from 2 to 10 μm and are regularly distributed in the core of the garnet. Microstructural and micro‐Raman investigations indicate the presence of two types of inclusions: crystallized silicate melt inclusions (i.e., nanogranitoids, NI), and fluid inclusions (FI). Microstructural evidence suggests that FI and NI coexist in the same cluster and are primary (i.e., were trapped simultaneously during garnet growth). FI have similar compositions in the three zones and comprise variable proportions of CO2, CH4, and N2, commonly with siderite, pyrophyllite, and kaolinite, suggesting a COHN composition of the trapped fluid. The mineral assemblage in the NI contains K‐feldspar, plagioclase, quartz, biotite, muscovite, chlorite, graphite and, rarely, calcite. Polymorphs such as kumdykolite, cristobalite, tridymite, and less commonly kokchetavite, were also found. Rehomogenized NI from the different zones show that all the melts are leucogranitic but have slightly different compositions. In samples from the upper amphibolite facies, melts are less mafic (FeO + MgO = 2.0–3.4 wt%), contain 860–1700 ppm CO2 and reach the highest H2O contents (6.5–10 wt%). In the transition zone melts have intermediate H2O (4.8–8.5 wt%), CO2 (457–1534 ppm) and maficity (FeO + MgO = 2.3–3.9 wt%). In contrast, melts at granulite facies reach highest CaO, FeO + MgO (3.2–4.7 wt%), and CO2 (up to 2,400 ppm), with H2O contents comparable (5.4–8.3 wt%) to the other two zones. Our results represent the first clear evidence for carbonic fluid‐present melting in the Ivrea Zone. Anatexis of metapelites occurred through muscovite and biotite breakdown melting in the presence of a COH fluid, in a situation of fluid–melt immiscibility. The fluid is assumed to have been internally derived, produced initially by devolatilization of hydrous silicates in the graphitic protolith, then as a result of oxidation of carbon by consumption of Fe3+‐bearing biotite during melting. Variations in the compositions of the melts are interpreted to result from higher T of melting. The H2O contents of the melts throughout the three zones are higher than usually assumed for initial H2O contents of anatectic melts. The CO2 contents are highest at granulite facies, and show that carbon‐contents of crustal magmas are not negligible at high T. The activity of H2O of the fluid dissolved in granitic melts decreases with increasing metamorphic grade. Carbonic fluid‐present melting of the deep continental crust represents, together with hydrate‐breakdown melting reactions, an important process in the origin of crustal anatectic granitoids.

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Section: Samples and Petrographysupporting

confidence: 88%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

See 2 more Smart Citations

Anatexis and fluid regime of the deep continental crust: New clues from melt and fluid inclusions in metapelitic migmatites from Ivrea Zone (NW Italy)

Carvalho

Bartoli

Ferri

et al. 2018

Journal Metamorphic Geology

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Tectonic Evolution of the Eastern Alps

KURZ,

FRITZ,

WÖLFLER

2024

Geodynamics of the Alps 1

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Jadeite and eclogite: Peculiar raw materials of Neolithic stone implements in Slovakia and their possible sources

Spišiak

Hovorka

2005

Geoarchaeology

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In this paper, we describe Neolithic/Aeneolithic implements made from high-pressure metabasites: jadeites and eclogites. As such rocks are unknown in the Western Carpathians mountain system, we presume distant source areas for the described raw material types. We present the morphology, cultural association, and the results of petrographic research (microprobe analyses of rock-forming minerals) on implements made from these raw materials found at two sites in the Slovak Republic. We propose that the raw materials of these implements crop out hundreds of kilometers from the sites on which they were discovered.

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Pre-Mesozoic Geology in the Alps

Cited by 66 publications

References 0 publications

Anatexis and fluid regime of the deep continental crust: New clues from melt and fluid inclusions in metapelitic migmatites from Ivrea Zone (NW Italy)

Anatexis and fluid regime of the deep continental crust: New clues from melt and fluid inclusions in metapelitic migmatites from Ivrea Zone (NW Italy)

Tectonic Evolution of the Eastern Alps

Jadeite and eclogite: Peculiar raw materials of Neolithic stone implements in Slovakia and their possible sources

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