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Earth, Planets and Space

Table 1 Mass loss (wt.%) as a function of temperature for the CI and CI-like chondrites.

From: Characterising the CI and CI-like carbonaceous chondrites using thermogravimetric analysis and infrared spectroscopy

Sample

 

25–200 °C

200–400 °C

300–800 °C

800–1000 °C

Total mass loss (25–1000 °C)

H2O (200–800 °C)

H (wt.%)

Ivuna

Ivu-1

8.5

5.1

15.4

1.8

29.0

18.7

2.1

 

Ivu-2

7.9

5.1

15.4

1.9

28.5

18.7

2.1

 

Average

8.2

5.1

15.4

1.8

28.7

18.7

2.1

Orgueil

Org-2

10.8

5.6

15.3

2.2

31.8

18.7

2.1

 

Org-3

9.1

5.3

14.4

2.0

28.9

17.8

2.0

 

Average

10.0

5.5

14.8

2.1

30.3

18.3

2.0

Y-82162

Y-82 (a)

6.1

2.2

4.6

2.4

14.5

5.9

0.7

 

Y-82 (b)

6.0

2.2

5.0

1.5

13.8

6.3

0.7

 

Average

6.1

2.2

4.8

2.0

14.1

6.1

0.7

Y-980115

 

9.0

3.2

6.3

1.6

18.8

8.1

0.9

  1. Most mass loss occurs between 25 and 800 °C, and the DTG curves are divided into different temperature regions related to dehydration of terrestrial adsorbed H2O (25–200 °C) and the dehydration and dehydroxylation of Fe-(oxy)hydroxides (200–400 °C) and phyllosilicates (300–800 °C). We determine the abundance of H2O in the CI and CI-like chondrites by assuming that all the mass loss between 200 and 800 °C is H2O (see “H2O abundances in CI chondrites” section)
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