Distribution of ammonium in minerals of metamorphic and granitic rocks

Honma, Hiroaki; Itihara, Yuuko

doi:10.1016/0016-7037(81)90122-8

Cited by 175 publications

(86 citation statements)

References 21 publications

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“…do not allow to clearly discriminate between crustal and magmatic sources. Such a positive isotopic signature is indeed typical of 1) N 2 produced by thermal decomposition of organic material buried in sedimentary material (Jenden et al, 1988;Fischer et al, 2002;Snyder et al, 2003;Inguaggiato et al, 2004) likely involved in the subduction process, and/or 2) low-grade metamorphism affecting NH 4 fixed in the crystal lattices of K-rich minerals (micas and K-feldspars) of crystalline rocks (e.g., Honma and Itihara, 1981;Mingram and Brauer, 2001).…”

Section: Crustal Vs Magmatic Sources In 2010-2015mentioning

confidence: 98%

Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010–2015: Insights into compositional changes related to the fluid source region(s)

et al. 2016

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Section: Crustal Vs Magmatic Sources In 2010-2015mentioning

confidence: 98%

Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010–2015: Insights into compositional changes related to the fluid source region(s)

et al. 2016

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“…During diagenesis, N forms ammonium that substitutes K in diagenetic minerals (Honma and Itihara, 1981;Itihara and Honma, 1979;Williams et al, 1995;Boyd et al, 1993). Thereby, N becomes a lithophile element in the geochemical cycle.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen in peridotite xenoliths: Lithophile behavior and magmatic isotope fractionation

Yokochi

Marty

Chazot

et al. 2009

Geochimica et Cosmochimica Acta

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International audienceIn order to document the origin and speciation of nitrogen in mantle-derived rocks and minerals, the N and Ar contents and isotopic compositions were investigated for hydrous and anhydrous peridotite xenoliths from Ataq, Yemen, from Eifel, Germany, and from Massif Central, France. Nitrogen and Ar were extracted by stepwise combustion with a fine temperature resolution, followed by fusion in a platinum crucible. A large isotopic disequilibrium of up to 25.4‰ is observed within single peridotite xenoliths, with δ15N values as low as −17.3‰ in phlogopite whereas clinopyroxene and olivine show positive δ15N values. Identical Sr isotopic ratios of phlogopite, clinopyroxene and whole rock in this wehrlite sample are consistent with crystallization from a common reservoir, suggesting that the light N signature of phlogopite might be the result of isotopic fractionation during N uptake from the host magma. The nitrogen concentration is systematically high in phlogopite, (7.6–25.7 ppm), whereas that of bulk peridotite xenoliths is between 0.1 and 0.8 ppm. The high N content of phlogopite is at least partly due to host magma–mineral interaction, and may also suggest the occurrence of N as View the MathML source that substituted for K+ during mineral growth in mafic magmas. Such speciation is consistent with the fact that N and Rb contents correlate well for a set of samples from mantle regions that were affected by subduction-related metasomatism and magmatism. The N/Rb ratios of these samples are comparable with values estimated for subduction zone magmas, but are one order of magnitude lower than the N/Rb ratios characterizing subducting slabs. This difference suggests preferential release of N relative to alkalis in the forearc region. N/40Ar* ratios of minerals from analyzed mantle xenoliths are much higher than those of vesicles in MORBs and OIBs, requiring either the occurrence of nitrogen speciation in the mantle more compatible than Ar, significant loss of fluid phase during entrainment, or long residence time of volatile elements in the mantle source(s) of fluids to increase drastically the 40Ar* budget of the latter

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“…Despite decreases of ammonium due to alteration of K-feldspar to sodic plagioclase (i.e. albiteoligoclase) (Honma & Itihara 1981) and/or epidote, muscovitization of K-feldspar and chloritization of biotite probably caused substantial enrichment of this sample from ammonium. This feature is in good agreement with Hall's (1993a) argument about the high ammonium content of chloritized biotite.…”

Section: Malayer Intrusive Complexmentioning

confidence: 97%

“…This feature is in good agreement with Hall's (1993a) argument about the high ammonium content of chloritized biotite. Furthermore, Honma & Itihara (1981) showed that the muscovite contains an average of ~40 % of N concentration in a rock. With respect to high Na 2 O, FeO, MgO and CaO and low K 2 O content of 106 it is concluded that the reaction (2) is responsible for alteration in this sample which is supported by petrographic observations of chloritization.…”

Section: Malayer Intrusive Complexmentioning

confidence: 99%

“…Recent research has revealed that geological nitrogen has an important role in geological problems such as lithogeochemical explorations (Ridgway et al 1990;Glasmacher et al 2003), biogeochemical implications (Boyd 2001;Holloway & Dahlgren 2002), environmental studies (Crews et al 2001), and petrological investigations (Honma & Itihara 1981;Hall 1999).…”

Section: Introductionmentioning

confidence: 99%

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The ammonium content in the Malayer igneous and metamorphic rocks (Sanandaj-Sirjan Zone, Western Iran)

Ahadnejad¹,

Hirt²,

Valizadeh³

et al. 2011

Geologica Carpathica

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Abstract:The ammonium (NH 4 + ) contents of the Malayer area (Western Iran) have been determined by using the colorimetric method on 26 samples from igneous and metamorphic rocks. This is the first analysis of the ammonium contents of Iranian metamorphic and igneous rocks. The average ammonium content of metamorphic rocks decreases from low-grade to high-grade metamorphic rocks (in ppm): slate 580, phyllite 515, andalusite schist 242. In the case of igneous rocks, it decreases from felsic to mafic igneous types (in ppm): granites 39, monzonite 20, diorite 17, gabbro 10. Altered granitic rocks show enrichment in NH 4 + (mean 61 ppm). The high concentration of ammonium in Malayer granites may indicate metasedimentary rocks as protoliths rather than meta-igneous rocks. These granitic rocks (S-types) have high K-bearing rock-forming minerals such as biotite, muscovite and K-feldspar which their potassium could substitute with ammonium. In addition, the high ammonium content of metasediments is probably due to inheritance of nitrogen from organic matter in the original sediments. The hydrothermally altered samples of granitic rocks show highly enrichment of ammonium suggesting external sources which intruded additional content by either interaction with metasedimentary country rocks or meteoritic solutions.

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Distribution of ammonium in minerals of metamorphic and granitic rocks

Cited by 175 publications

References 21 publications

Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010–2015: Insights into compositional changes related to the fluid source region(s)

Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010–2015: Insights into compositional changes related to the fluid source region(s)

Nitrogen in peridotite xenoliths: Lithophile behavior and magmatic isotope fractionation

The ammonium content in the Malayer igneous and metamorphic rocks (Sanandaj-Sirjan Zone, Western Iran)

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