What is the meaning of hydrogen-to-carbon ratio determined in Archean organic matter?

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What is the meaning of hydrogen-to-carbon ratio determined in Archean organic matter?

Frédéric Delarue, Sylvie Derenne, Kenichiro Sugitani, François Baudin, Frances Westall, Barbara Kremer, Romain Tartese, Adriana Gonzalez,

François Robert

To cite this version:

Frédéric Delarue, Sylvie Derenne, Kenichiro Sugitani, François Baudin, Frances Westall, et al.. What is the meaning of hydrogen-to-carbon ratio determined in Archean organic matter?. Organic Geo- chemistry, Elsevier, 2018, 122, pp.140 - 146. �10.1016/j.orggeochem.2018.05.013�. �hal-01828236�

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Table 1: Rock-Eval-derived parameters (S1, S2, TpkS2, TOCand HI) and H/C atomic ratios determined on Silurian (0.42 Gyr-old) and Archean (3.0 to 3.5 Gyr-old) silicified cherts. H/C ratios were determined with bulk elemental analysis and with NanoSIMS using the ratio between the

12C¹³C- and ¹²C2-

molecular ionic species. “n.d.” indicates that parameter was not determined.

Sample name

Geological Formation , country

Age (Gyr)

S1 (mg/g)

S2 (mg/g)

TpkS2 (°C)

TOC (w.%)

HI (mg/g TOC)

H/C (Bulk analysis)

12C¹³C^- /¹²C₂^-

H/C (NanoSIMS)

ZALESIE Zalesie Nowe, Poland 0.42 2.6 122.5 478 51.1 240 0.95 n.d. n.d.

GGR2 Farrel Quartzite, Australia 3.0. 0.5 0.9 386 18.5 5 0.42 n.d. n.d.

GRW10 Farrel Quartzite, Australia 3.0. 12.0 19.1 326 29.5 65 0.55 n.d. n.d.

ORW9 Farrel Quartzite, Australia 3.0. 0.5 1.1 433 20.7 5 0.38 n.d. n.d.

GFWEX1-1b Farrel Quartzite, Australia 3.0. 1.0 3.0 368 17.1 18 0.31 n.d. n.d.

MGTKS1up Farrel Quartzite, Australia 3.0. 2.4 5.5 586 40.8 14 0.30 n.d. n.d.

MGTKS1 Farrel Quartzite, Australia 3.0. 36.1 30.8 372 37.7 82 0.85 7.4 0.85

MGTKS3 Farrel Quartzite, Australia 3.0. 0.4 0.9 582 46.9 2 0.24 1.8 0.23

99SA07 Kromberg, South Africa 3.3 n.d. n.d. n.d. n.d. n.d. 0.39 3.4 0.40

07SA22 Hoeggonoeg, South Africa 3.4 0.3 0.7 395 17.6 4 1.35 1.1 0.15

Panorama Strelley Pool, Australia 3.4 4.6 5.4 448 24.2 22 n.d. n.d. n.d.

4 of 03/08/85 Warrawoona, Australia 3.5 2.3 8.0 471 3.7 217 n.d. 5.5 0.64

MGTKS1

MGTKS3

07SA22 99SA07

4 of 03/08/85

0.15 0.64

0.00 0.40 0.80

0.0 2.0 4.0 6.0 8.0

y = 0.1098x + 0.0329 R² = 0.9991

12CH^-/¹²C¹³C^- ionic ratio Bulk H/C atomic ratio

ZALESIE

GFWEX1-1b

MGTKS3 ORW9

MGTKS1up

MGTKS1

07SA22

Panorama

4 of 03/08/85 GRW10 GGR2

Programmed pyrolysis temperature (°C)

FID response (a.u.)

Time Time

0 200

S1 S2 S2

400 600

395°C

395°C

448°C

448°C 366°C

355°C

471°C 471°C

582°C

582°C 515°C

372°C

372°C 418°C

534°C 586°C

586°C

586°C

584°C 368°C

368°C 433°C

433°C 326°C

326°C 386°C

478°C 478°C

386°C

584°C 523°C 584°C

576°C

423°C

Hydrothermally altered OM

Bitumen Droplet

D G

D

G

1000 1200 1400 1600 1800 2000

1000 1200 1400 1600 1800 2000 Sedimentary OM

Surface degassing feature

2 mm 10 µm

a. b.

c. d.

Raman shift (cm^-1)

Intensity (a.u.)Intensity (a.u.)

Surrounding OM