2019
DOI: 10.3390/min9010065
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Age and Origin of Monazite Symplectite in an Iron Oxide-Apatite Deposit in the Adirondack Mountains, New York, USA: Implications for Tracking Fluid Conditions

Abstract: Monazite crystals, intergrown with allanite, fluorapatite, and quartz from the Cheever Mine iron oxide-apatite (IOA-type) deposit in Essex County, New York, USA, display rare symplectite textures. Electron probe wavelength-dispersive spectrometry (WDS) mapping and major and trace element characterization of these features reveal a natural experiment in fluid-mediated monazite recrystallization. Two types of monazite with symplectite intergrowths have been recognized (Type I and II). Both types of symplectite d… Show more

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Cited by 6 publications
(3 citation statements)
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“…Iron oxide-apatite deposits cross-cut all lithologies except late pegmatites, which cross-cut some ore bodies and are dated at about 1040 to 1020 Ma (LUPULESCU et al, 2011). Detailed geological descriptions of the deposits are given in VALLEY et al (2011), MCLELLAND et al (2013) CHIARENZELLI et al (2018, REGAN et al (2019) and references therein.…”
Section: Journal Pre-proofmentioning
confidence: 99%
“…Iron oxide-apatite deposits cross-cut all lithologies except late pegmatites, which cross-cut some ore bodies and are dated at about 1040 to 1020 Ma (LUPULESCU et al, 2011). Detailed geological descriptions of the deposits are given in VALLEY et al (2011), MCLELLAND et al (2013) CHIARENZELLI et al (2018, REGAN et al (2019) and references therein.…”
Section: Journal Pre-proofmentioning
confidence: 99%
“…Rims showed a slightly tighter cluster of ages ranging from 1021 ± 8 Ma to 972 ± 32 Ma and yielded a weighted mean of 1011 ± 5.0 Ma (mean square weighted deviation [MSWD] = 2.8). Rims are interpreted as the result of fluid-mediated recrystallization processes based on texture (Harlov et al, 2011;Williams et al, 2011), an association with apatite (Harlov et al, 2011), and the correspondence of ages falling well within the realm of metasomatism within the region (Valley et al, 2011;Chiarenzelli et al, 2017;Regan et al, 2019). The large range in core dates is thus interpreted to represent igneous cores variably disturbed by fluid-mediated dissolution-reprecipitation reactions (Grand'Homme et al, 2016).…”
Section: Sample Pl5100mentioning
confidence: 96%
“…Fluid alteration has been interpreted to range in age from ca. 1050 to 980 Ma (Valley et al, 2011;Regan et al, 2019), which likely overlapped and outlasted leucogranite plutonism.…”
Section: ■ Adirondack Mountainsmentioning
confidence: 99%