Initial Reports, Volume 201
Shipboard Scientific Party
Chapter 9, Table T3. Hydrocarbon gas concentrations in headspace, Holes 1228A and 1228B.

Note: * = concentrations were not calculated from samples processed according to the safety protocol due to systematically lower yield compared to longer extractions.

Core, section, interval (cm)	Depth (mbsf)	Methane (20 min, 60 C) (ppm in headspace)	Methane (24 hr, 22 C) (ppm in headspace)	Methane (1 week, 22 C) (ppm in headspace)	Methane (um)	Ethane (20 min, 60 C) (ppm in headspace)	Ethane (24 hr, 22 C) (ppm in headspace)	Ethane (1 week, 22 C) (ppm in headspace)	Ethane (uM)

201-1228A-								
1H-1, 121-126	1.21		11.5		1.97			
1H-2, 130-135	2.71		7.8		1.35			
1H-3, 130-135	4.21	11.1			*			
2H-1, 130-135	6.2		12.6		2.18			
2H-2, 145-150	7.85		15.2		2.65			
2H-3, 130-135	9.2	9.6			*			
2H-5, 130-135	12.2		14.8		2.69			
2H-6, 145-150	13.85	11.6			*			
3H-1, 130-135	15.7		22.7		4.12				
3H-3, 0-5	17.4		28.5		5.29				
3H-3, 130-135	18.7	24.6			*				
3H-5, 0-5	20.4		23.7		4.4				
3H-5, 130-135	21.7		42.4		8.1				
3H-6, 0-5	21.9	22.1			*				
4H-1, 130-135	25.2		15		3.7		1.15		0.22
4H-3, 0-5	26.9		37.4		7.66				
4H-3, 130-135	28.2	14.7			*				
4H-4, 0-5	28.4		33.2		6.8				
4H4, 145-150	29.85	21.5			*				
4H-6, 0-5	31.4		19.8		4.05				
4H-7, 0-5	32.9	24.2			*	0.58			*
5H-1, 130-135	34.7		44.5		8.39				
5H-3, 0-5	36.4		26.5		6.32		1.11		0.21
5H-3, 130-135	37.7	22.9			*	0.64			*
5H-4, 0-5	37.9		31.2		5.87				
5H-4, 145-150	39.35	20.7			*				
6H-1, 130-135	44.2		38.2		6.43		0.61		0.11
6H-2, 0-5	44.4	23.4			*	0.55			*
6H-4, 0-5	47.4		28.3		5.8		1.31		0.22
6H-5, 0-5	48.9	29			*	0.56			*
7H-1, 130-135	53.7		22.7		4.17				
7H-3, 0-5	55.4	17.8			*				
7H-4, 0-5	56.9		17		4.59		1.01		0.19
7H-5, 0-5	58.4	12.3			*				
8H-2, 0-5	63.4		18.8		4.35				
8H-4, 0-5	66.4	11.8			*				
8H-5, 0-5	67.9		22.5		4.42				
8H-6, 0-5	69.4	14.4			*				
9H-2, 0-5	72.9		14.6		3.74				
9H-4, 0-5	75.9	11.9			*				
9H-4, 145-150	77.35		16.6		3.29				
10H-1, 130-135	82.2		21.5		4.27				
10H-4, 0-5	85.4		13.8		2.75		0.81		0.16
11H-1, 80-85	91.2		21.3		5.36				
11H-2, 0-5	91.4	5.6			*				
14H-1, 130-135	111.7		8.2		2.18		0.54		0.14
14H-2, 145-150	113.35	2.8			*				
14H-5, 130-135	117.7		8		2.2				
15H-1, 141-146	120.31	1.7			*				
16H-1, 130-135	129.7		6.5		1.87				
16H-2, 145-150	131.35	1			*				
16H-4, 0-5	132.9		7.9		2.27				
18H-1, 130-135	148.7		9.7		2.83				
18H-2, 145-150	150.35	2.1			*				
18H-4, 0-5	151.9		7.3		2.13				
19H-1, 74-79	157.64	2.2			*				
19H-1, 74-79	157.64		4.5		1.3				
20H-1, 115-120	167.55	1.8			*				
20H-3, 0-5	169.25		3.9		1.11				
21H-1, 135-150	177.25		5.4		1.46				
22H-1, 115-120	186.55		5.9		1.59				
22H-3, 55-60	188.95		7.7		2.08				

201-1228C-									
1H-1, 30-45	0.3			11.3	1.9			0.2	0.03
1H-1, 45-60	0.45			13.4	2.26				
1H-1, 60-75	0.6			11.9	2.01				
1H-1, 75-90	0.75			14.3	2.44			0.32	0.05
1H-1, 90-105	0.9			19.2	3.27				
1H-1, 105-120	1.05			18.9	3.24				
1H-1, 120-135	1.2			14	2.4				
1H-1, 135-150	1.35			16.3	2.8			0.38	0.07