Complex zoning in apatite from the Idaho Batholith; a record of magma mixing and intracrystalline trace element diffusion

Tepper, Jeffrey H.; Kuehner, S. M.

doi:10.2138/am-1999-0412

Cited by 95 publications

(50 citation statements)

References 36 publications

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“…The textures and mineral compositions of NWA 998 raise several interesting petrogenetic issues related to late and intercumulus igneous processes that affected this particular Analyses by method of Tepper and Kuehner (1999). Italicized values are probably at or below detection limits.…”

Section: Igneous Petrogenesismentioning

confidence: 99%

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Petrology of Martian meteorite Northwest Africa 998

Treiman

Irving

2008

Meteorit & Planetary Scien

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Petrology of Martian meteorite Northwest Africa 998replacing or forming overgrowths on olivine and augite, ∼1% titanomagnetite, and other phases including potassium feldspar, apatite, pyrrhotite, chalcopyrite, ilmenite, and fine-grained mesostasis material. Minor secondary alteration materials include "iddingsite" associated with olivine (probably Martian), calcite crack fillings, and iron oxide/hydroxide staining (both probably terrestrial). Shock effects are limited to minor cataclasis and twinning in augite. In comparison to other nakhlites, NWA 998 contains more low-calcium pyroxenes and its plagioclase crystals are blockier. The large size of the intercumulus feldspars and the chemical homogeneity of the olivine imply relatively slow cooling and chemical equilibration in the late-and post-igneous history of this specimen, and mineral thermometers give subsolidus temperatures near 730 °C. Oxidation state was near that of the QFM buffer, from about QFM−2 in earliest crystallization to near QFM in late crystallization, and to about QFM + 1.5 in some magmatic inclusions. The replacement or overgrowth of olivine by pigeonite and orthopyroxene (with or without titanomagnetite), and the marginal replacement of augite by pigeonite, are interpreted to result from late-stage reactions with residual melts (consistent with experimental phase equilibrium relationships). Apatite is concentrated in planar zones separating apatite-free domains, which suggests that residual magma (rich in P and REE) was concentrated in planar (fracture?) zones and possibly migrated through them. Loss of late magma through these zones is consistent with the low bulk REE content of NWA 998 compared with the calculated REE content of its parent magma.

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Section: Igneous Petrogenesismentioning

confidence: 99%

“…Analyses for apatite and glass inclusions in olivine and augites were obtained at the University of Washington. Standards and procedures for the apatite analyses were as detailed in Tepper and Kuehner (1999).…”

Section: Chemical Analysesmentioning

confidence: 99%

Petrology of Martian meteorite Northwest Africa 998

Treiman

Irving

2008

Meteorit & Planetary Scien

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“…Compositional zoning in apatite, as in other accessory phases, can result from magma mixing, changes in crystal/melt partitioning and kinetic effects (Tepper and Kuehner 1999;Boyce and Hervig 2009). The observation that complex zoning at Nemrut occurs in apatites in unzoned host minerals (Fig.…”

Section: Apatitementioning

confidence: 99%

Peralkaline felsic magmatism at the Nemrut volcano, Turkey: impact of volcanism on the evolution of Lake Van (Anatolia) IV

Macdonald

Sumita

Schmincke

et al. 2015

Contrib Mineral Petrol

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“…In the rhyodacite and, to a lesser extent, in the hornblende-biotite porphyry, few analyses have yielded high sulfur concentrations over 0.5 wt% SO 3 and up to 1.6 wt% SO 3 . Sulfur has been proposed to enter the apatite crystal structure mainly in the oxidized form S 6+ by replacing P 5+ through a charge-balanced coupled substitution possibly involving Na + , Si 4+ , REE 3+ and Y 3+ cations (Rouse and Dunn 1982;Liu and Comodi 1993;Tepper and Kuehner 1999;Parat et al 2002). A recent S XANES study has shown that minor amounts of S 4+ and S 2− can also enter the structure of apatite as a function of oxygen fugacity (Konecke et al 2017).…”

Section: Apatitementioning

confidence: 99%

“…4a, b). However, a number of analyses, mainly from the rhyodacite, show high apatite Na + content that cannot be explained by (1) S 6+ + Na + ⇔ P 5+ + Ca 2+ (Liu and Comodi 1993), (Rouse and Dunn 1982), (Tepper and Kuehner 1999). S 6+ substitution alone (see apatite with 0.20 > Na + > 0.06 pfu for S 6+ ~ 0.05 pfu on Fig.…”

Section: Apatitementioning

confidence: 99%

Amphibole and apatite insights into the evolution and mass balance of Cl and S in magmas associated with porphyry copper deposits

Chelle-Michou

Chiaradia

2017

Contrib Mineral Petrol

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Chlorine and sulfur are of paramount importance for supporting the transport and deposition of ore metals at magmatichydrothermal systems such as the Coroccohuayco Fe-Cu-Au porphyry-skarn deposit, Peru. Here, we used recent partitioning models to determine the Cl and S concentration of the melts from the Coroccohuayco magmatic suite using apatite and amphibole chemical analyses. The pre-mineralization gabbrodiorite complex hosts S-poor apatite, while the syn-and post-ore dacitic porphyries host S-rich apatite. Our apatite data on the Coroccohuayco magmatic suite are consistent with an increasing oxygen fugacity (from the gabbrodiorite complex to the porphyries) causing the dominant sulfur species to shift from S 2− to S 6+ at upper crustal pressure where the magmas were emplaced. We suggest that this change in sulfur speciation could have favored S degassing, rather than its sequestration in magmatic sulfides. Using available partitioning models for apatite from the porphyries, pre-degassing S melt concentration was 20-200 ppm. Estimates of absolute magmatic Cl concentrations using amphibole and apatite gave highly contrasting results. Cl melt concentrations obtained from apatite (0.60 wt% for the gabbrodiorite complex; 0.2-0.3 wt% for the porphyries) seems much more reasonable than those obtained from amphibole which are very low (0.37 wt% for the gabbrodiorite complex; 0.10 wt% for the porphyries). In turn, relative variations of the Cl melt concentrations obtained from amphibole during magma cooling are compatible with previous petrological constraints on the Coroccohuayco magmatic suite. This confirms that the gabbrodioritic magma was initially fluid undersaturated upon emplacement, and that magmatic fluid exsolution of the gabbrodiorite and the pluton rooting the porphyry stocks and dikes were emplaced and degassed at 100-200 MPa. Finally, mass balance constraints on S, Cu and Cl were used to estimate the minimum volume of magma required to form the Coroccohuayco deposit. These three estimates are remarkably consistent among each other (ca. 100 km 3 ) and suggest that the Cl melt concentration is at least as critical as that of Cu and S to form an economic mineralization.

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Complex zoning in apatite from the Idaho Batholith; a record of magma mixing and intracrystalline trace element diffusion

Cited by 95 publications

References 36 publications

Petrology of Martian meteorite Northwest Africa 998

Petrology of Martian meteorite Northwest Africa 998

Peralkaline felsic magmatism at the Nemrut volcano, Turkey: impact of volcanism on the evolution of Lake Van (Anatolia) IV

Amphibole and apatite insights into the evolution and mass balance of Cl and S in magmas associated with porphyry copper deposits

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