Petrogenesis and Experimental Petrology of Granitic Rocks

Johannes, Wilhelm; Holtz, François

doi:10.1007/978-3-642-61049-3

Cited by 578 publications

(450 citation statements)

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“…subtypes of red leucogranites plots close to the minimum composition in the experimental haplogranite system at ~ 2 kbar (Johannes and Holtz, 1996) (Fig 10) (Fig. 3).…”

Section: Accepted M Manuscriptmentioning

confidence: 64%

“…One curve (dark spots) represents the average Pb growth curve according to Stacey and Kramers (1975), the other curve (bright spots) represents Pb evolution with higher μ ( Normative Qz-Ab-Or compositions of the grey granites and red leucogranites I and II. Phase relations for the water saturated haplo granite system at 1, 2, 5, 10 and 20 kbar are according to Johannes and Holtz (1996). Nd isotope ratios are 2σ errors in the last two digits.…”

Section: Figmentioning

confidence: 99%

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Syn-orogenic high-temperature crustal melting: Geochronological and Nd–Sr–Pb isotope constraints from basement-derived granites (Central Damara Orogen, Namibia)

Ostendorf

Jung

Berndt-Gerdes

et al. 2014

Lithos

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“…subtypes of red leucogranites plots close to the minimum composition in the experimental haplogranite system at ~ 2 kbar (Johannes and Holtz, 1996) (Fig 10) (Fig. 3).…”

Section: Accepted M Manuscriptmentioning

confidence: 64%

Section: Figmentioning

confidence: 99%

Syn-orogenic high-temperature crustal melting: Geochronological and Nd–Sr–Pb isotope constraints from basement-derived granites (Central Damara Orogen, Namibia)

Ostendorf

Jung

Berndt-Gerdes

et al. 2014

Lithos

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“…Thus we see no evidence that the studied granites could represent the more evolved fractionates from a calc-alkaline system. The composition of these monzogranites is different from that of melts obtained experimentally from pelitic protoliths, rather suggesting a major involvement of metaigneous protoliths or metagreywacke sources (Conrad et al, 1988;Holtz, 1989;Holtz and Johannes, 1991;Johannes and Holtz, 1996;Patiño-Douce and Johnston, 1991). The VMG shows mineralogical and geochemical features that are characteristic of crustal-derived magmas.…”

Section: Nature Of the Granite Sourcesmentioning

confidence: 66%

Late-Variscan emplacement and genesis of the Vieira do Minho composite pluton, Central Iberian Zone: Constraints from U–Pb zircon geochronology, AMS data and Sr–Nd–O isotope geochemistry

Martins

Ovaia

Noronha

2013

Lithos

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In the Central Iberian Zone synorogenic (syn-and late-D 3 , the last deformation phase) composite batholiths of biotite-rich granitods with peraluminous character are well represented. We report here U-Pb zircon and monazite ages, geochemical, Sr-Nd-O isotopic data and Anisotropy of Magnetic Susceptibility (AMS) studies for the late-D 3 Vieira do Minho pluton, in northern Portugal. AMS reveals the paramagnetic behaviour of these granites and the magnetic fabric enhances the major role of NW-SE regional anisotropies on controlling the ascent and emplacement of the magmas. Magnetic anisotropy and medium temperature microstructures also point out the evolution of regional tectonics during crystallization of the magma. U-Pb zircon and monazite analyses yield consistent ages of 310 ± 2 Ma and 312 ± 2 Ma, interpreted as emplacement age. The Vieira do Minho pluton consists of two peraluminous monzogranites, the VMG and the MRG. Both have similar ε Nd values (VMG= −5.2 to −5.7; MRG =−4.98 to −5.96) but the VMG is slightly enriched in 87 Sr/ 86 i = 0.7087-0.7098 as well as in δ 18 O in the range of 10.6‰ to 11.0‰ than the MRG with 87 Sr/ 86 i =0.7064-0.7075 and δ 18 O=9.9‰-10.5‰. These granites are associated with coeval scarce grabroic intrusions and/or mafic microgranular enclaves which are not considered as mafic precursors of the associated granitic magmatism. Instead, a lower metaigneous crustal source, at different levels, is proposed based on the available data set.

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“…For illustration, application of the PTitaniQ thermobarometer~using a nominal pressure of 3 kbar and a TiO 2 ϭ ;0.15, as calculated using RMELTS for melt inclusion data from other grains! suggests that such low Ti contents likely correspond to magmatic temperatures near or below 7508C; such low-T melts are likely to be water-rich i.e., near the water-saturated solidus for silicic materials; Johannes & Holtz, 1996!. Subsequent accretion on the euhedral core of higher-Ti quartz~yellow-green region in anhedral outer form of this zone~yellow/red interface!…”

Section: Applicationsmentioning

confidence: 99%

A Study of Cathodoluminescence and Trace Element Compositional Zoning in Natural Quartz from Volcanic Rocks: Mapping Titanium Content in Quartz

et al. 2012

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Abstract:This article concerns application of cathodoluminescence~CL! spectroscopy to volcanic quartz and its utility in assessing variation in trace quantities of Ti within individual crystals. CL spectroscopy provides useful details of intragrain compositional variability and structure but generally limited quantitative information on element abundances. Microbeam analysis can provide such information but is time-consuming and costly, particularly if large numbers of analyses are required. To maximize advantages of both approaches, natural and synthetic quartz crystals were studied using high-resolution hyperspectral CL imaging~1.2-5.0 eV range! combined with analysis via laser ablation inductively coupled plasma mass spectrometry~LA-ICPMS!. Spectral intensities can be deconvolved into three principal contributions~1.93, 2.19, and 2.72 eV!, for which intensity of the latter peak was found to correlate directly with Ti concentration. Quantitative maps of Ti variation can be produced by calibration of the CL spectral data against relatively few analytical points. Such maps provide useful information concerning intragrain zoning or heterogeneity of Ti contents with the sensitivity of LA-ICPMS analysis and spatial resolution of electron microprobe analysis.

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Petrogenesis and Experimental Petrology of Granitic Rocks

Cited by 578 publications

References 0 publications

Syn-orogenic high-temperature crustal melting: Geochronological and Nd–Sr–Pb isotope constraints from basement-derived granites (Central Damara Orogen, Namibia)

Syn-orogenic high-temperature crustal melting: Geochronological and Nd–Sr–Pb isotope constraints from basement-derived granites (Central Damara Orogen, Namibia)

Late-Variscan emplacement and genesis of the Vieira do Minho composite pluton, Central Iberian Zone: Constraints from U–Pb zircon geochronology, AMS data and Sr–Nd–O isotope geochemistry

A Study of Cathodoluminescence and Trace Element Compositional Zoning in Natural Quartz from Volcanic Rocks: Mapping Titanium Content in Quartz

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