Structural state transformation in alkali feldspar: evidence for post-crystallization deformation from Proterozoic granite, Kumaun Himalaya (India)

Pandey, Prabha; Rawat, R. S.; Jowhar, T. N.

doi:10.1016/j.jseaes.2004.06.007

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…If the warm-temperature ice nucleation observed for ATD is instead due to inorganic materials, their identity is not certain. Interestingly, even feldspars and clay mineral IN are not necessarily expected to be preserved well during the heat treatments: feldspars can undergo phase transitions as low as 400 ± 50 °C , and clay minerals undergo water loss as low as 350 °C . Mineral materials could still satisfy the observed heat resilience while undergoing structural or chemical changes in the presence of water.…”

Section: Resultsmentioning

confidence: 99%

The Labile Nature of Ice Nucleation by Arizona Test Dust

Perkins

Gillette

Hill

et al. 2019

ACS Earth Space Chem.

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Dust aerosol is an important atmospheric component due to its ice nucleating ability, which affects cloud phase and precipitation. Arizona Test Dust (ATD) is often used as a proxy for environmental dust aerosol in laboratory studies. In this work, we examine how the ice nucleating behavior of ATD is altered with different solution phase and dry aging processes under several conditions. We find that ATD ice nucleating ability is degraded in significant ways under most conditions, including aging for less than a day in deionized water or NaCl solution. Additional studies are detailed for processing in acidic solutions, salt solutions, peroxide treatment, heat treatment, and protease enzyme treatment. We find evidence of warm-temperature ice nucleating particles that share the analytically characteristic attributes of organic ice nucleators but are heat stable beyond the normal range for organic materials. We hypothesize that this is due to binding and stabilization of organic materials at the mineral surface.

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Section: Resultsmentioning

confidence: 99%

The Labile Nature of Ice Nucleation by Arizona Test Dust

Perkins

Gillette

Hill

et al. 2019

ACS Earth Space Chem.

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“…Sediments of the Jaunsar Group show late stage diagenesis to very low-grade metamorphism and lie in contact with Siwalik sediments to its southern extremity by the MBT (figure 2). The adjoining Amritpur Granite is deformed and provides a basement for the overlying rocks (Pandey et al 2005).…”

Section: Geological Backgroundmentioning

confidence: 99%

Provenance of the Late Neogene Siwalik sandstone, Kumaun Himalayan Foreland Basin: Constraints from the metamorphic rank and index of detrital rock fragments

Jalal

Ghosh

2012

J Earth Syst Sci

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An understanding about lithology, tectonics and unroofing history of provenance is mostly drawn from the compositional and textural parameters of the detrital fragments. We here use different metamorphic ranks (Rm) and metamorphic index (MI) values of rock fragments present in Late Neogene Siwalik sandstone of the Ramganga sub-basin to infer the provenance history. The study indicates maximum contribution from metamorphic ranks 1 and 2 (Rm1 and Rm2; meta-sedimentary and very low grade metamorphic rocks) and minimum from metamorphic rank 4 (Rm4; high metamorphic grade rocks). The metamorphic index (MI) values range from 118 to 224, with an average of 186. The meta-sedimentary and very low-grade metamorphic rock fragments are derived from the Lesser Himalayan domain. The medium-to-high grade metamorphic fragments are derived from the Lesser Himalayan Crystalline bodies. The abundance of Rm2 and Rm3 detrital modes suggest the exhumation of crystalline bodies of the Ramgarh and Almora most likely occurred prior to 7 Ma and subsequently the source area shifted and resulted abundant supply of Rm1 fragments due to the upliftment along Main Boundary Thrust around 5.55 Ma.

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Methods for Estimation of Uncertainties in Geothermobarometry

Jowhar

2012

Advances in Intelligent and Soft Computing

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Structural state transformation in alkali feldspar: evidence for post-crystallization deformation from Proterozoic granite, Kumaun Himalaya (India)

Cited by 4 publications

References 25 publications

The Labile Nature of Ice Nucleation by Arizona Test Dust

The Labile Nature of Ice Nucleation by Arizona Test Dust

Provenance of the Late Neogene Siwalik sandstone, Kumaun Himalayan Foreland Basin: Constraints from the metamorphic rank and index of detrital rock fragments

Methods for Estimation of Uncertainties in Geothermobarometry

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