Table T13. Organic carbon contents and results from Rock-Eval pyrolysis of Aptian organic-rich horizons in the mid-Pacific.
Core, section,
interval (cm)
TOC
(wt%)
S1
(mg/g)
S2
(mg/g)
S3
(mg/g)
Tmax
(°C)
PI
(S1/S2)
HI
(mg HC/g TOC)
OI
(mg CO2/g TOC)
Shatsky Rise (Northern High):





198-1207B-







44R-1, 60-61 34.7 13.99 147.12 7.64 401 0.09 423 21
44R-1, 76-77 10.4 3.24 54.46 2.69 403 0.06 523 25
44R-1, 103-104 1.7 0.49 7.45 0.94 417 0.06 438 55
Shatsky Rise (Southern High):





32-305-







65-1, 100-103 9.3






Manihiki Plateau:







31-317A-







16-2, 126 0.1






16-2, 131-134 24.9






16-2, 133 29.6






16-2, 150 0.7






Mid-Pacific Mountains:





62-463-







70-1, 92 1.7






70-2, 53-54 1.0


430
210 190
70-2, 68-70 1.2


425
197 118
70-2, 77-78 6.2


417
521 51
70-2, 116 2.1






70-3, 20-21 2.9


424
393 89
70-3, 21 3.7






70-3, 30-31 1.9


430
265 105
70-3, 31-32 6.9


419
451 61
70-3, 32 4.4






70-4, 112 2.3






70-5, 100-101 2.3


411
294 93
70-5, 101 2.0






70-5, 106-108 4.2


413
408 101
70-5, 110 4.4






70-5, 115 3.0






70-5, 120 5.1






70-5, 125 4.6






70-5, 129-130 3.0


416
469 103
70-5, 130 7.5






70-5, 135 4.8






70-5, 140 3.9


415
431 80
70-6, 39-42 4.4


429
478 40
70-6, 41 1.7






70-6, 44-46 2.6


418
243 88
70-CC, 20 1.2






Mid-Pacific Mountains (Resolution Guyot):





143-866A-







85R-3, 47-49 34.5 5.39 50.36
387 0.11 146 53
85R-3, 50-52 3.2 2.29 22.22
398 0.10 686 35
86R-1, 143-145 5.0 1.97 35.83
425 0.05 720 42
86R-2, 111-113 7.4 5.93 58.17
418 0.10 784 36
88R-1, 56-58 3.6 0.84 14.18
413 0.06 390 48
89R-1, 94-95 1.0 0.04 0.96
419 0.04 921 77
89R-1, 96-97 2.3 0.04 1.59
419 0.03 68 69
89R-1, 97-98 14.4 0.39 18.72
422 0.02 130 39
89R-1, 98-99 4.7 0.57 14.97
423 0.04 318 51

Notes: TOC = total organic carbon. S1 and S2 = peaks corresponding to free and kerogen-bound HC, respectively generated by Rock-Eval pyrolysis; S3 = amount of CO2 released by thermal cracking of kerogen. Tmax = peak temperature of kerogen breakdown. PI = production index. HI = hydrogen index, HC = hydrocarbon. OI = oxygen index. Data compiled from Bode (1975); Shipboard Scientific Party, Leg 32 (1975); Cameron (1976); Jackson and Schlanger (1976); Dean (1981); Dean et al. (1981); Mélières et al. (1981); Simoneit and Stuermer (1982); Baudin et al. (1995). The TOC value for 31-317A-16-2, 133 cm, is the average of two measurements. The table includes all values for organic-rich intervals (>1.0 wt% TOC) reported in the literature.