气候变化领域集成服务门户(CCPortal): Thermal Pressure in the Laser-Heated Diamond Anvil Cell: A Quantitative Study and Implications for the Density Versus Mineralogy Correlation of the Mantle

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DOI	10.1029/2020JB020006
	Thermal Pressure in the Laser-Heated Diamond Anvil Cell: A Quantitative Study and Implications for the Density Versus Mineralogy Correlation of the Mantle
	Yen C.E.; Williams Q.; Kunz M.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	Thermal pressure is an inevitable thermodynamic consequence of heating a volumetrically constrained sample in the diamond anvil cell. Its possible influences on experimentally determined density-mineralogy correlations are widely appreciated, yet the effect itself has never been experimentally measured. We present here the first quantitative measurements of the spatial distribution of thermal pressure in a laser-heated diamond anvil cell (LHDAC) in both olivine and AgI. The observed thermal pressure is strongly localized and closely follows the distribution of the laser hotspot. The magnitude of the thermal pressure is of the order of the thermodynamic thermal pressure (αKTΔT) with gradients between 0.5 and 1.0 GPa/10 μm. Remarkably, we measure a steep gradient in thermal pressure even in a sample that is heated close to its melting line. This generates consequences for pressure determinations in pressure-volume-temperature (PVT) equation of state measurements when using an LHDAC. We show that an incomplete account of thermal pressure in PVT experiments can lead to biases in the coveted depth versus mineralogy correlation. However, the ability to spatially resolve thermal pressure in an LHDAC opens avenues to measure difficult-to-constrain thermodynamic derivative properties, which are important for comprehensive thermodynamic descriptions of the interior of planets. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	laser-heated diamond anvil cell; mantle mineralogy; PVT equation of state; thermal pressure
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187574
作者单位	Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Department of Mathematics, University of California, Berkeley, CA, United States; Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	Yen C.E.,Williams Q.,Kunz M.. Thermal Pressure in the Laser-Heated Diamond Anvil Cell: A Quantitative Study and Implications for the Density Versus Mineralogy Correlation of the Mantle[J],2020,125(10).
APA	Yen C.E.,Williams Q.,&Kunz M..(2020).Thermal Pressure in the Laser-Heated Diamond Anvil Cell: A Quantitative Study and Implications for the Density Versus Mineralogy Correlation of the Mantle.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Yen C.E.,et al."Thermal Pressure in the Laser-Heated Diamond Anvil Cell: A Quantitative Study and Implications for the Density Versus Mineralogy Correlation of the Mantle".Journal of Geophysical Research: Solid Earth 125.10(2020).