Thermal diffusivity and thermal conductivity of alkali feldspar at 0.8–3 GPa and 300–873 K

Xiong, Zili; Zhang, Baohua; Ge, Jianhua; Zhai, Shuangmeng; Guo, Xinzhuan

doi:10.1007/s00410-021-01797-2

Cited by 8 publications

(5 citation statements)

References 55 publications

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“…The effect of temperature heterogeneity on the measured results was thus negligible. Our previous work 79 also demonstrated a negligible influence of sample thickness and heating history (heating or cooling cycles) on the experimental results using the transient plane-source method. The total experimental uncertainties of D and κ originating from the abovementioned factors are therefore expected to be less than 5% (Supplementary Table 1 ).…”

Section: Methodsmentioning

confidence: 89%

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Crustal melting in orogenic belts revealed by eclogite thermal properties

Zhang

Fei

et al. 2022

Nat Commun

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Partial melting in the continental crust may play a critical role on the behavior of continents during collision. However, the occurrence of partial melt in orogenic continental crust is not well understood. Since the temperature of the orogen is controlled by the thermal properties of constituent rocks, we measured the thermal conductivity and diffusivity of eclogite, the most important ultrahigh pressure metamorphic rocks, as a function of pressure, temperature, composition, and water content, and simulated the thermal structure of the Sulu and Himalaya-Tibet orogens in eastern and southwestern China, respectively. Our results show that the temperature at ~30-km depth beneath the orogens reaches the solidus of wet granite and phengite (~940 K), therefore, the partial melting in the orogenic continental crust is well explained. The melt may facilitate the exhumation of subducted crust, produce the low seismic-velocity zone, and cause the high-conductivity anomaly in the shallow depth of orogenic belts.

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Section: Methodsmentioning

confidence: 89%

“…The D and κ of the samples were measured on a DIA-type multi-anvil apparatus using a cell assembly design (Supplementary Fig. 7 ) following our previous studies 14 , 28 , 79 . Samples were isolated from a graphite heater using an alumina sleeve, which also acted as a thermal insulator to effectively restrict lateral heat flow.…”

Section: Methodsmentioning

confidence: 99%

Crustal melting in orogenic belts revealed by eclogite thermal properties

Zhang

Fei

et al. 2022

Nat Commun

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“…Several assumptions have been made in the modeling: (a) The lunar crust is composed of anorthosite (main rock type of the lunar highlands) and basalt (main rock type of lunar Mare) with a thickness of about 58 km (Nakamura, 1983; Zuber et al., 1994). The thermal conductivity of the lunar crust is set to a constant value of 1.2 W m −1 K −1 because the temperature and pressure dependence of the thermal conductivity of plagioclase and basalt are both negligible, and the absolute values are also small (Branlund & Hofmeister, 2012; Ni et al., 2015; Xiong et al., 2021). (b) The lunar mantle is composed of olivine (Fo 90 , 60 vol%) and orthopyroxene (En 90 , 40 vol%).…”

Section: Discussionmentioning

confidence: 99%

Effect of Iron Content on the Thermal Conductivity and Thermal Diffusivity of Orthopyroxene

Guo,

Feng,

Zhang

et al. 2024

Geochem Geophys Geosyst

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The thermal properties of major minerals play a key role in understanding the internal dynamic mechanism and thermal evolution of the Earth and rocky planets. In this study, we first investigated the effect of Fe on the thermal conductivity (κ) and the thermal diffusivity (D) of orthopyroxene at 1–3 GPa and 293–873 K by the transient plane source method. The κ and D both decrease with increasing temperature and decreasing pressure. With increasing Fe content, the two parameters both quickly decrease from the beginning and then slack off. We further modeled the thermal evolution of S‐type asteroids, which strongly depends on the composition model and the dimension of the planet. Combining the present data with surface heat flow and heat production, the lunar's geotherm until 1,400 km is constructed. The core‐mantle boundary temperature of the Moon is refined from 1,883 to 1,754 K.

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“…Sediment values are grain thermal properties, with actual thermal properties calculated as an average with pore water, with porosity as determined in Equation 7. References summarized in table: F (Funnell et al., 1996), R&G (Rudnick & Gao, 2003), G (Guerri et al., 2015), S (Seipold, 2001), W (C. Wang et al., 2014), X (Xiong et al., 2021), F&G (Feng & Guo, 2022), K (Kanamori et al., 1968).…”

Section: Methodsmentioning

confidence: 99%

“…References summarized in table: F , R&G (Rudnick & Gao, 2003), G (Guerri et al, 2015), S (Seipold, 2001), W (C. Wang et al, 2014), X (Xiong et al, 2021), F&G (Feng & Guo, 2022), K (Kanamori et al, 1968).…”

Section: Zealandia Depth To Base Of Magnetic Sourcesmentioning

confidence: 99%

The Thermal Structure of Central Te Riu a Māui/Zealandia Continent as Determined From the Depth to Base of Magnetic Sources

Miller,

Kirkby,

Mortimer

et al. 2023

JGR Solid Earth

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To investigate the thermal structure of central Te Riu a Māui/Zealandia continent we estimate the depth to base of magnetic sources (DBMS), using an updated compilation of magnetic data. We calculate thousands of power spectral density estimates and solve an analytic solution for the fractal distribution of magnetization using a Bayesian method constrained by a sediment thickness model. Our DBMS results are broadly similar to a global model yet show complex relationships with independent models of crust and elastic thicknesses, and depth to base of seismicity (D90). Across central Zealandia, DBMS occurs above, coincident with, and below the Moho reflecting that factors additional to temperature influence DBMS. Away from subduction zones crustal thickness likely modulates DBMS while plate margins show varying influence dependent on margin characteristics. In the Taupō Volcanic Zone we interpret DBMS to reflect Curie point temperature at an average depth of 9–11 km. Error analysis shows that the choice of prior influences the posterior standard deviation and can result in counter intuitive error versus DBMS relationships. We use the DBMS as a basal temperature isotherm in heat flow models to compare with heat flow derived from borehole temperature measurements. Using the standard Curie point temperature of 580°C we find that DBMS derived heat flow models over estimate heat flow in areas underlain by plutonic rocks. We propose this reflects a higher titanomagnetite content in these rocks, although detailed studies of the magnetic mineralogy of Zealandia's plutonic rocks are required.

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Thermal diffusivity and thermal conductivity of alkali feldspar at 0.8–3 GPa and 300–873 K

Cited by 8 publications

References 55 publications

Crustal melting in orogenic belts revealed by eclogite thermal properties

Crustal melting in orogenic belts revealed by eclogite thermal properties

Effect of Iron Content on the Thermal Conductivity and Thermal Diffusivity of Orthopyroxene

The Thermal Structure of Central Te Riu a Māui/Zealandia Continent as Determined From the Depth to Base of Magnetic Sources

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