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

IF 2.9 2区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2024-06-16 DOI:10.1029/2023GC011419

Xinzhuan Guo, Bo Feng, Baohua Zhang, Shuangmeng Zhai, Weihong Xue, Yunke Song, Yuping Song, Xinxin Yan

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Abstract

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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铁含量对正长石导热性和热扩散率的影响

主要矿物的热性质对于理解地球和岩质行星的内部动力机制和热演化起着关键作用。在本研究中，我们首先通过瞬态平面源方法研究了正长石在 1-3 GPa 和 293-873 K 条件下铁对其热导率（κ）和热扩散率（D）的影响。κ和D均随温度升高和压力降低而减小。随着铁含量的增加，这两个参数都从一开始迅速降低，然后逐渐减小。我们进一步建立了 S 型小行星的热演化模型，它与行星的成分模型和尺寸密切相关。结合目前的数据和地表热流与产热，我们构建了 1400 公里以内的月球地热。月球的地核-地幔边界温度从 1,883 千卡细化到 1,754 千卡。

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来源期刊

Geochemistry Geophysics Geosystems 地学-地球化学与地球物理

CiteScore

5.90

自引率

11.40%

发文量

252

审稿时长

1 months

期刊介绍： Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.