Table 2 n-Alkane and isoprenoids biomarker ratios calculated from TIC, m/z = 191, m/z = 217 mass fragmentogram of selected Xihuapidianzi Formation extracts.

From: Response of a continental fault basin to the global OAE1a during the Aptian: Hongmiaozi Basin, Northeast China

Depth (m)

Pr/C17

Ph/C18

Pr/Ph

GI/C30H

C27/C29

C27 (%)

C28 (%)

C29 (%)

525.60

0.04

0.06

0.57

0.27

1.22

39.27

28.57

32.16

550.90

0.05

0.06

0.63

0.23

1.17

39.83

26.08

34.09

720.00

0.39

0.36

0.39

0.22

1.54

43.74

27.94

28.32

773.50

0.05

0.08

0.50

0.22

1.14

38.76

27.27

33.97

798.00

0.12

0.23

0.25

0.23

1.08

37.11

28.43

34.47

860.00

0.93

1.19

0.59

0.16

1.10

39.22

25.20

35.58

  1. Pr pristine, Ph phystane, GI/C30H gammacerane index/C30hopane, C27, C28, C29 C27, C28, C29 ααα regularsteranes (20R).
Back to article page