Multi-mode magnesium diffusion in sanidine: Applications for geospeedometry in magmatic systems

Shamloo, Hannah I.; Till, C. B.; Hervig, R. L.

doi:10.1016/j.gca.2021.01.044

Cited by 6 publications

(1 citation statement)

References 64 publications

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“…Another aperture formed by ten tetragonal TO 4 sharing the apex is 0.15 nm × 0.67 nm [12]. The 10-membered elliptical ring is the largest channel in feldspar, and alkali or alkaline-earth cations such as Na + , K + , Ca 2+ , and Ba 2+ or even Pb 2+ , Cd 2+ , and Mg 2+ can occupy this type of channel [12,13]. The overall structural states of feldspars (including obliquity, triclinicity, and degree of disorder) are very complex and may correlate to the petrogenesis of their containing rocks [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

The Behavior of Water in Orthoclase Crystal and Its Implications for Feldspar Alteration

Zuo

Liu

2022

Crystals

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The phenomenon of feldspar alteration that occurs in the interior of feldspar crystals remains poorly understood. We observed experimentally that water can go into orthoclase crystals under pressures of up to 600 MPa at room temperature. With increasing pressure, the FTIR spectra of colorless orthoclase show a sharp increase in integral absorbance from 1.50 cm−1 to 14.54 cm−1 and normalized integral absorbance from 120 cm−2 to 1570 cm−2; the pink orthoclase saturates quickly with no significant change in either the integral absorbance or normalized integral absorbance. The different responses to the pressure between colorless orthoclase and pink orthoclase might be related to the K content in the structure. Moreover, FTIR spectra at atmospheric pressure collected in different crystallography directions show different absorbance intensities, which illustrates the characteristic of preferred crystallographic orientations. These results reveal that H2O molecules can occur as structural constituents entering the crystallographic channels of alkali feldspar crystals, preferentially along (001) orientation. These findings provide clues into the mechanism of feldspar alteration occurring in the interior of feldspar crystals, as well as the formation of micropores and microstructure in feldspar minerals. This study also provides important insights into the behavior of water molecules in nominally anhydrous minerals in the upper crust of the Earth.

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Section: Introductionmentioning

confidence: 99%

The Behavior of Water in Orthoclase Crystal and Its Implications for Feldspar Alteration

Zuo

Liu

2022

Crystals

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Diffusion chronometry of volcanic rocks: looking backward and forward

Chakraborty

Dohmen

2022

Bull Volcanol

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Diffusion of elements that result in compositional zoning in minerals in volcanic rocks may be used to determine the timescales of various volcanic processes (e.g., residence times in different reservoirs, ascent rates of magmas). Here, we introduce the tool and discuss the reasons for its gain in popularity in recent times, followed by a summary of various applications and some main inferences from those applications. Some specialized topics that include the role of diffusion anisotropy, isotopic fractionation by diffusion, image analysis as a tool for expediting applications, and the sources of uncertainties in the method are discussed. We point to the connection between timescales obtained from diffusion chronometry to those obtained from geochronology as well as various monitoring tools. A listing of directions in which we feel most progress is necessary/will be forthcoming is provided in the end.

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Diffusion anisotropy of Ti in zircon and implications for Ti-in-zircon thermometry

Bloch

Jollands

Tollan

et al. 2022

Earth and Planetary Science Letters

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Multi-mode magnesium diffusion in sanidine: Applications for geospeedometry in magmatic systems

Cited by 6 publications

References 64 publications

The Behavior of Water in Orthoclase Crystal and Its Implications for Feldspar Alteration

The Behavior of Water in Orthoclase Crystal and Its Implications for Feldspar Alteration

Diffusion chronometry of volcanic rocks: looking backward and forward

Diffusion anisotropy of Ti in zircon and implications for Ti-in-zircon thermometry

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