Table 5 Biomarkers of saturated hydrocarbon and aromatic hydrocarbon of Da’anzhai shales.

From: Paleosedimentary environmental reconstruction and mechanisms of the response to the Toarcian OAE in a lacustrine shale system

Submember

Depth (m)

TOC (%)

ETR

Ts/(Ts + Tm)

C30D/C30H

Gam/C30H

C29 αββ/(αββ + ααα)

C29 ααα 20S/(20S + 20R)

(C27 + C28)/C29

Upper

2874.70

0.10

0.59

0.47

0.12

0.24

0.40

0.45

2.67

2880.69

0.52

0.51

0.42

0.26

0.21

0.44

0.50

2.13

2889.67

2.10

0.50

0.31

0.44

0.10

0.47

0.53

1.12

2890.87

1.08

0.57

0.40

0.24

0.20

0.46

0.51

1.40

2896.49

0.68

0.62

0.52

0.58

0.43

0.45

0.48

2.19

2899.07

1.09

0.55

0.72

6.53

1.82

0.48

0.68

2.65

2902.47

2.88

0.58

0.74

10.25

3.08

0.49

0.72

3.22

Middle

2904.31

2.46

0.57

0.69

7.22

1.75

0.48

0.66

2.52

2906.87

2.19

0.62

0.70

10.02

2.80

0.53

0.73

3.02

2909.06

0.75

0.59

0.71

12.42

3.59

0.52

0.67

3.17

2909.80

2.23

0.55

0.73

14.18

3.99

0.48

0.62

2.74

2912.85

0.46

0.41

0.78

7.51

2.00

0.43

0.65

2.72

2913.56

2.00

0.32

0.80

7.73

1.80

0.49

0.75

3.59

2915.12

1.92

0.38

0.79

24.79

6.44

0.51

0.72

3.63

2915.86

1.23

0.43

0.79

47.89

19.11

0.42

0.71

2.96

2916.72

1.07

0.49

0.72

4.52

0.94

0.50

0.63

2.48

2917.91

1.48

0.35

0.84

15.02

3.32

0.48

0.69

2.84

2920.25

2.69

0.40

0.80

11.15

2.24

0.51

0.67

2.58

2922.68

2.36

0.29

0.85

16.25

2.91

0.44

0.69

1.15

2923.89

1.40

0.32

0.79

6.87

1.21

0.54

0.57

1.61

2924.91

1.97

0.32

0.86

15.96

3.14

0.47

0.73

2.88

2925.93

1.38

0.30

0.82

5.97

0.87

0.49

0.73

3.09

2928.28

1.46

0.43

0.81

18.65

3.56

0.50

0.68

3.17

2930.08

3.63

0.34

0.84

11.03

2.12

0.50

0.67

2.66

2932.11

1.19

0.31

0.78

3.47

0.53

0.47

0.78

2.97

2934.81

2.10

0.32

0.85

10.41

1.73

0.46

0.66

2.69

2936.05

3.54

0.33

0.88

18.69

3.42

0.45

0.65

1.79

2938.35

3.36

0.27

0.86

16.36

2.78

0.42

0.66

1.64

2939.36

1.79

0.36

0.87

21.21

4.12

0.46

0.71

2.51

2942.44

0.94

0.39

0.77

7.98

1.95

0.44

0.64

2.65

2943.32

1.94

0.39

0.84

17.39

2.85

0.44

0.66

2.03

2944.67

2.19

0.34

0.85

20.61

3.58

0.48

0.70

3.30

2945.65

0.85

0.48

0.71

3.33

0.97

0.43

0.55

2.82

Lower

2950.53

0.14

0.39

0.80

8.06

1.79

0.47

0.59

2.41

2953.48

0.49

0.46

0.72

2.87

0.51

0.46

0.58

3.39

2958.21

0.53

0.71

0.56

0.91

0.37

0.43

0.50

3.41

  1. ETR: Extended tricyclic terpane ratio; Ts: 18α(H)-22,29,30-C27 trisnorneohopane; Tm: 17α(H)-22,29,30-C27 trisnorneohopane; C30D: C30 diahopanes; C30H: C30 hopane; Gam: Gammacerane; (C27 + C28)/C29: (C27 regular sterane + C28 regular sterane)/C29 regular sterane.
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