The thermal and physical characteristics of the Gao-Guenie (H5) meteorite

Beech, Martin; Coulson, Ian M.; Nie, Wenshuang; McCausland, Phil J.A.

doi:10.1016/j.pss.2009.01.002

Cited by 26 publications

(29 citation statements)

References 29 publications

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“…A typical value chosen for many thermal models is around 750 J kg À1 K À1 (cf. the discussion in Ghosh and McSween (1999)), in agreement with at least one set of ordinary chondrite measurements at room temperature (Beech et al, 2009). Yomogida and Matsui (1983) measured the thermal diffusivity of 20 ordinary chondrite meteorites and used these data to calculate heat capacities, coming to similar values at 300 K but noting that, assuming a variation with temperature consistent with that measured for the minerals, one should expect meteorite heat capacities to drop to about 500 J kg À1 K À1 at 200 K. However, earlier work by this group (Matsui and Osako, 1979) had directly measured the heat capacity of five Yamato meteorites (four ordinary chondrites and a howardite) at 300 K, 350 K, and 400 K with results only about two-thirds of these theoretical values.…”

Section: Introductionsupporting

confidence: 84%

“…For example, their thermal conductivity values for different ordinary chondrites at 200 K range over nearly an order of magnitude, from 0.4 to 3.8 W m À1 K À1 , with L chondrite values only slightly lower, and mostly overlapping, those of H chondrites. In addition, a recent paper by Beech et al (2009) has measured the thermal conductivity of the Gao Guernie H5 chondrite, reporting a value of 3.0 W m À1 K À1 at room temperature. (The value reported in that paper is 10 times too big, due to a units conversion mistake, Beech, personal communication.)…”

Section: Previous Estimations Of Meteorite Thermal Conductivitymentioning

confidence: 99%

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The thermal conductivity of meteorites: New measurements and analysis

Opeil

Consolmagno

Britt

2010

Icarus

152

215

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Section: Introductionsupporting

confidence: 84%

Section: Previous Estimations Of Meteorite Thermal Conductivitymentioning

confidence: 99%

The thermal conductivity of meteorites: New measurements and analysis

Opeil

Consolmagno

Britt

2010

Icarus

152

215

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“…This bulk density is somewhat higher (∼3.5%) than the bulk density measured via our method. The average grain density of the six fragments of Jilin is 3.7910 ± 0.0298 g/cm 3 , this value agrees very well with the grain density (3.78 ± 0.04 g/cm 3 ) as determined by Beech et al [2009] for a 62.35 g fragment of Jilin. The porosities of the six fragments of Jilin ranged from 7.8620% to 11.3715% (average 9.0307 ± 1.2954).…”

Section: Determination Of Errorssupporting

confidence: 84%

“…The average bulk density for six Jilin fragments is 3.4586 ± 0.0015 g/cm 3 . This value is in agreement with the bulk density (3.49 ± 0.03 g/cm 3 ) of a 33.56 g piece of Jilin measured by the Archimedean bead method [ Macke , 2010], and slightly higher than the corresponding values (3.41 ± 0.03 g/cm 3 , 3.398 g/cm 3 ) of 62.35 g and 73.4 g fragments measured using the Archimedean bead method [ Kohout et al , 2008; Beech et al , 2009]. However, Wilkison and Robinson [2000] give an average bulk density (measured again using the Archimedean bead method) for a 20.61 g fragment of Jilin as 3.58 ± 0.06 g/cm 3 [ Wilkison and Robinson , 2000].…”

Section: Determination Of Errorssupporting

confidence: 83%

A new method for the measurement of meteorite bulk volume via ideal gas pycnometry

Li¹,

Wang²,

Li³

et al. 2012

J. Geophys. Res.

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[1] To date, of the many techniques used to measure the bulk volume of meteorites, only three methods (Archimedean bead method, 3-D laser imaging and X-ray microtomography) can be considered as nondestructive or noncontaminating. The bead method can show large, random errors for sample sizes of smaller than 5 cm 3 . In contrast, 3-D laser imaging is a high-accuracy method even when measuring the bulk volumes of small meteorites. This method is both costly and time consuming, however, and meteorites of a certain shape may lead to some uncertainties in the analysis. The method of X-ray microtomography suffers from the same problems as 3-D laser imaging. This study outlines a new method of high-accuracy, nondestructive and noncontaminating measurement of the bulk volume of meteorite samples. In order to measure the bulk volume of a meteorite, one must measure the total volume of the balloon vacuum packaged meteorite and the volume of balloon that had been used to enclose the meteorite using ideal gas pycnometry. The difference between the two determined volumes is the bulk volume of the meteorite. Through the measurement of zero porosity metal spheres and tempered glass fragments, our results indicate that for a sample which has a volume of between 0.5 and 2 cm 3 , the relative error of the measurement is less than AE0.6%. Furthermore, this error will be even smaller (less than AE0.1%) if the determined sample size is larger than 2 cm 3 . The precision of this method shows some volume dependence. For samples smaller than 1 cm 3 , the standard deviations are less than AE0.328%, and these values will fall to less than AE0.052% for samples larger than 2 cm 3 . The porosities of nine fragments of Jilin, GaoGuenie, Zaoyang and Zhaodong meteorites have been measured using our vacuum packaging-pycnometry method, with determined average porosities of Jilin, GaoGuenie, Zaoyang and Zhaodong of 9.0307%, 2.9277%, 17.5437% and 5.9748%, respectively. These values agree well with the porosities of fragments of which have been measured using the Archimedean bead method and 3-D laser imaging. This method also may be applied to the study of rare samples in other fields (e.g., archeology and geology).Citation: Li, S., S. Wang, X. Li, Y. Li, S. Liu, and I. M. Coulson (2012), A new method for the measurement of meteorite bulk volume via ideal gas pycnometry,

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“…We consider three test cases: (i) ξ = 1, which permits a comparison with the results in CV1 and thus a reference solution where effects studied in this paper are not included; (ii) ξ = 0.5; and (iii) ξ = 0.1, which correspond to an increasing level of thermal shielding of the core, presumably by a finer-grain surface layer. We find that these ratios are plausible, given the various laboratory measurements of granular and monolithic meteoritic samples (e.g., Yomogida & Matsui 1983;Beech et al 2009;Opeil et al 2010).…”

Section: Summary Of Model Parametersmentioning

confidence: 61%

Thermal stresses in small meteoroids

Čapek

Vokrouhlický

2012

A&A

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Aims. We extend our previous analysis of thermal stresses in small, spherical and homogeneous meteoroids by taking into account the effects of a surface insulating layer. Methods. Using analytical computations, we determine the temperature distribution in a spherical inhomogeneous body smaller than ∼10 cm with a high-conductivity core and a low-conductivity surface layer. Our main approximation consists in (i) linearization of the surface energy-conservation constraint and (ii) omission of the seasonal effects in the Fourier spectrum of the incident solar radiation flux. Using the temperature solution, we analytically compute the mechanical (thermal) stress field in the core, neglecting its effects in the particulate surface layer. Conditions for material failure in the whole volume of the body are analyzed. In particular, we pay attention to whether the surface layer depth evolves toward an equilibrium situation. Results. As the meteoroid approaches the Sun, the thermal stress first exceeds the material strength at the surface of meteoroid. If the fractured material is able to stay on meteoroid, a particulate shell begins to form. After one revolution about the Sun, this process is roughly completed. We determine the dependence of its thickness on perihelion distance, spin axis orientation with respect to the Sun, and the size of meteoroid. We estimate the distribution of the final depths of the surface layer for eight major meteoroid showers with perihelion distances smaller than 1 AU.

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The thermal and physical characteristics of the Gao-Guenie (H5) meteorite

Cited by 26 publications

References 29 publications

The thermal conductivity of meteorites: New measurements and analysis

The thermal conductivity of meteorites: New measurements and analysis

A new method for the measurement of meteorite bulk volume via ideal gas pycnometry

Thermal stresses in small meteoroids

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