Thermal evolution and sintering of chondritic planetesimals - III. Modelling the heat conductivity of porous chondrite material

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Table 1

Granular components and some properties of chondrite groups.

Chondrite group		EH		EL		H		L		LL		CI	CM	CR¹	CO	CK	CV	K

Chondrules²	[vol%]	60−80		60−80		60−80		60−80		60−80		≪1	20	50−60	48	15	45	25
Avg. diameter²	[mm]	0.2		0.6		0.3		0.7		0.9		−	0.3	0.7	0.15	0.7	1.0	0.6
Matrix²	[vol%]	<2−15	?	<2−15	?	10−15		10−15		10−15		>99	70	30−50	34	75	40	73
f_ma (Eq. (1))		0.1		0.1		0.15		0.15		0.15		1.0	0.78	0.42	0.42	0.83	0.47	0.74
Porosity⁵	[%]	3−12?		3−12?		2−12		2−11		5−14		35	18−28		2−20	20−23	20−24
φ₀ (Eqs. (3), (4))	[%]	29		29		24		24		24		36	30	19	19	32	21	30
FeNi metal²³	[vol%]	8	?	15	?	10		5		2		0	0.1	5−8	1−5	< 0.01	0−5	6−9
Avg. diameter⁷	mm	0.04		0.1		0.19		0.16		0.14
FeS⁶	[vol%]	4−8				4−5		4−5		4−5		4	1−4	1−4	1−5	0−1	2−5	6−10
CAIs²	[vol%]	0.1−1	?	0.1−1	?	0.1−1	?	0.1−1	?	0.1−1	?	≪ 1	5	0.5	13	4	10	< 0.1
Petrol. types⁴		3−5		3−6		3−6		3−6		3−6		1	2	2	3	3−6	3	3
Max. temp.⁴	[K]	1020		1220		1220		1220		1220		430	670	670	870	1220	870

Notes. Adapted from Trieloff & Palme (2006), with modifications. A question mark indicates data that are very uncertain.

⁽¹⁾

CR group without CH chondrites.

⁽²⁾

From Brearley & Jones (1998).

⁽³⁾

In matrix.

⁽⁴⁾

From Sears & Dodd (1988).

⁽⁵⁾

From Consolmagno et al. (2008).

⁽⁶⁾

From Cloutis et al. (2011a,b, 2012a−c), and van Schmus (1969).

⁽⁷⁾

From Akridge & Sears (1999).

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