Proc. IODP, 311, Data report: bulk carbonate content of sediments and mineralogy of authigenic carbonates along an east–west transect in the northern Cascadia margin, IODP Expedition 311

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Table T3. Carbonate content semiquantitative mineralogical composition of carbonate samples. (See table notes.)

Core, section,
interval (cm) Depth
(mbsf) MCM
(wt%) Carbonate (wt%) LMMC HMC LMD HMD

Relative Absolute (d₁₀₄ Å) (wt%) MgCO₃
(mol%) (d₁₀₄ Å) (wt%) MgCO₃
(mol%)

A Cc Dol (Rh) Si A Cc Dol (Rh) Si Σ Cbt (d₁₀₄ Å) (wt%) (d₁₀₄ Å) (wt%)

311-U1325B-

16X-6, 28–30 126.93 28.6
41 59

11 16
27 3.031 4
3.003 7 10.7 2.918 4 2.902 12

311-U1325C-

6X-4, 47–48 221.98 64.6
8 92

5 55
60 3.029 2
2.995 2
2.924 8 2.895 47

11X-1, 119–122 258.29 68.8
93 7

63 5
68

3.004 63 10.4 2.928 5

311-U1326C-

2H-2, 92–93 6.32 63.5
23 77

13 46
60 3.014 13 7.0

2.914 46

9X-2, 92–93 71.52 80.2
1 99

1 73
74 3.031 1

2.900 73

311-U1326D-

2X-1, 72–74 SED 89.12 10.2
99 1

10 tr
10 3.016 6 6.4 2.990 4

2.897 tr

5X-2, 5–6 118.75 67.2
4 96

2 60
62 3.035 1
2.993 1
2.905 60

9X-1, 0–1 155.90 15.6
100

16

16

3.009 16 8.7

17X-3, 0–100 235.90 16.1
100

16

16 3.012 16 7.7

20X-3, 0–1 263.75 33.3
33 7 (41) 18
12 3 (15) 6 36 3.024 3
2.994 9 13.8 2.935 1 2.894 1

311-U1327C-

10H-1, 96–98 75.56 24.0
73 27

17 6
23 3.015 17 6.7

2.902 6

16X-2, 120–150 126.4 11.5
22 6 72
3 1 9 13 3.034 3

2.898 1

17X-CC, 13–18 136.77 66.7
83 17

54 11
66 3.015 54 6.7

2.920 11

18X-2, 0–5 142.35 66.7
88 12

58 8
66

3.003 58 10.7 2.920 8

18X-2, 130–150 143.65 76.0
3 97

2 68
70 3.024 1
2.986 1

2.893 68

19X-1, 75–77 SED 151.85 20.2
73 27

14 5
20 3.030 5 1.7 3.000 9 11.7 2.930 4 2.890 1

20X-1, 0–2 160.80 49.5
98 2

48 1
49 3.016 5
2.988 44 15.8 2.923 1

20X-5, 6–7 166.14 9.4
75 17 7
7 2 1 9

3.008 7 9.1

2.893 2

21X-7, 0–1 178.43 81.6
1 99

1 75
76 3.028 1

2.897 75

311-U1327D-

5X-1, 65–75 126.95 64.2
48 52

30 32
61 3.016 30 6.4

2.903 32

10P-1, 0–92 155.10 85.3
4 96

3 76
79 3.031 1
2.995 2

2.896 76

10P-1, 78–80 155.88 64.2
31 69

19 42
61 3.014 19 7.0

2.900 42

11X-1, 0–8 157.10 67.4
6 94

4 58
62

2.989 4
2.929 11 2.897 48

16X-CC, 10–11 228.40 62.1
98 2

60 2
62 3.019 60 5.4

2.937 1 2.897 tr

16X-CC, 18–19 228.48 68.4
94 6

64 4
68 3.019 64 5.4

2.937 4 2.897 tr

311-U1328B-

1H-2, 8–9 1.58 29.6
82 18

24 5
29

3.009 24 8.7 2.936 4 2.907 1

3X-CC, 0–1 6.20 76.5 30 68 2
23 52 1
76 3.030 1
2.986 51 16.4 2.911 1

4P-1, 0–11 14.50 70.4 13 72 16
9 50 11
69 3.027 3
2.993 46 14.1 2.936 11

6X-1, 0–20 (A) 18.40 70.9 8 82 10
6 58 7
70 3.030 1
2.996 57 13.1 2.939 7

6X-1, 0–20 (B) 18.40 71.9 8 77 14
6 55 10
71 3.020 4
2.989 51 15.4 2.935 10

6X-1, 25–26 18.65 70.4
87 13

61 9
70 3.019 8 5.4 2.984 53 17.1 2.936 9

6X-1, 30–31 18.70 60.2
88 12

52 7
60 3.026 4
2.984 49 17.1 2.935 7

6X-1, 35–36 18.75 41.3
96 4

40 2
41 3.035 5
2.990 35 15.1

2.902 2

6X-1, 36–38 >250 μm 18.76 68.5 11 62 27
8 41 18
67 3.025 8 3.4 2.993 33 14.1 2.935 18

6X-1, 47–50 18.87 70.9
87 13

61 9
70 3.026 4
2.986 57 16.4 2.932 9

311-U1328C-

5P-1, 0–2 92.0? 83.7 46 48 5
39 40 5
83 3.025 1
2.985 39 16.8 2.929 5

19X-4, 18–19 220.21 9.2
96 4

9 tr
9 3.035 2
2.988 7 15.8

2.894 tr

19X-4, 24–26 220.27 14.3
94 6

13 1
14 3.034 4
2.998 9 12.4

2.899 1

19X-4, 26–28 220.29 50.0
80 20

39 10
49 3.023 8 4.0 2.987 31 16.1 2.935 10

19X-4, 32–36 220.35 58.2
92 8

53 5
58 3.016 2
2.998 51 12.4 2.935 5

22X-CC, 12–14 253.70 78.6

100

72
72

2.887 72

22X-CC, 20–21 253.78 36.2
13 87

4 29
34 3.034 4
2.990 1

2.888 29

22X-CC, 20–22 253.78 71.4
2 98

2 64
66 3.032 2

2.890 64

25X-2, 77–79 276.37 59.2
3 97

2 53
55 3.034 tr
2.992 1

2.895 53

311-U1328D-

1X-2, 40–42 1.90? 31.1
91 9

28 3
31 3.030 3
2.994 25 13.8 2.937 2 2.904 1

1X-5, 9–11 6.09? 43.4
97 3

42 1
43 3.025 3
2.992 39 14.4 2.925 1 2.901 1

1X-5, 10–11 6.10? 50.0
97 3

48 1
50 3.030 4
2.993 45 14.1 2.911 1

1X-5, 135–150 7.35? 83.7
81 19

66 16
82

2.989 66 15.4

2.902 16

1X-CC, 0–5 8.10? 39.8
27 73

10 27
37 3.032 4
2.993 7 14.1

2.895 27

2X-2, 30–31 5.80? 67.9
30 70

19 45
64

2.988 19 15.8 2.916 23 2.894 22

2X-CC, 0–5 6.29? 60.7
8 92

4 52
56 3.032 2
2.999 2

2.904 52

311-U1328E-

2X-1, 52–54 7.02 70.4
100

70

70

3.001 70 11.4

8X-1, 57–58 27.27 71.4
93 7

66 5
71 3.030 1
2.989 65 15.4 2.935 5

8X-1, 97–98 27.67 67.3
96 4

64 3
67

2.990 64 15.1 2.931 2 2.897 tr

9X-1, 16–17 36.46 68.4
85 15

57 10
67

2.989 57 15.4 2.927 10

311-U1329C-

4H-3, 138–140 31.48 34.6

100

32
32

2.922 13 2.898 19

4H-3, 140–142 31.50 58.6

100

54
54

2.923 22 2.897 32

5H-3, 129–131 40.89 14.7
100

15

15 3.018 12 5.7 2.991 3

5H-6, 61–62 44.71 26.2
30 70

7 17
25 3.035 4
2.999 3
2.931 2 2.905 15

8H-2, 58–60 59.68 79.6
100

80

80

2.993 80 14.1

8H-2, 62–64 59.72 53.9
100

54

54

2.995 54 13.4

8H-2, 91–93 60.01 7.9
95 5

7 tr
8 3.035 3
2.996 5 13.1

2.893 tr

12H-2, 36–37 97.44 27.7
67 33

18 9
27 3.024 2
2.995 16 13.4 2.933 7 2.907 2

17H-1, 0–2 135.60 67.6
90 10

60 7
67 3.031 23 1.3 3.004 37 10.4 2.944 5 2.913 1

18X-2, 65–66 142.35 75.9
45 55

33 40
72 3.016 33 6.4

2.928 6 2.900 40

18X-2, 69–71 142.39 3.7
10 90

tr 3
3 3.028? tr

2.900 3

18X-5, 18–20 146.38 89.0

100

82
82

2.897 82

18X-5, 27–29 146.47 80.6

100

74
74

2.895 74

19X-1, 64–66 150.54 33.0
7
93
3
35 38 3.027 3

20X-1, 70–71 160.30 78.0
100

78

78

3.000 78 11.7

20X-1, 89–90 160.49 79.6
100

80

80

3.000 80 11.7

20X-1, 125–126 160.85 81.7
100

82

82

2.997 82 12.8

20X-3, 34–36 162.94 80.6
100

81

81

2.995 81 13.4

20X-5, 34–35 165.44 69.6
100

70

70

2.996 70 13.1

20X-CC, 19–20 166.00 83.2

100

77
77

2.896 77

21X-2, 118–120 171.98 44.0
36 8 56
17 4 26 47 3.013 17 7.4

2.929 4

21X-3, 61–63A 172.91 49.2
96
4
48
2 49 3.019 48 5.4

21X-3, 61–63B 172.91 52.9
100

53

53 3.017 53 6.0

21X-3, 61–63 SED 172.91 51.0
100

51

51 3.017 51 6.0

21X-3, 129–131 173.59 16.2
38
62
7
11 18 3.011 7 8.1

21X-3, 129–131 Bis 173.59 63.5
18
82
13
58 71 3.014 13 7.0

21X-6, 0–30 176.30 81.7
1 99

1 74
75 3.033 1

2.894 74

22X-CC, 72–74 187.75 60.3
100

60

60 3.028 60 2.3

311-U1329E-

4H-5, 48–50 30.48 67.5
11 89

7 56
63 3.031 7 1.3

2.926 4 2.902 52

4H-5, 93–95 30.93 35.6
10 90

3 30
33 3.033 3

2.923 5 2.899 25

4H-5, 113–118 31.13 70.1
1 99

1 64
65 3.033 1

2.929 7 2.901 57

4H-6, 72–74 SED 32.22 42.5
5 95

2 37
39

2.988 2
2.926 4 2.898 33

8Y-1, 35–37 104.35 63.9

100

59
59

2.894 59

Core, section, interval (cm)	Depth (mbsf)	MCM (wt%)	Carbonate (wt%)	LMMC	HMC	LMD	HMD
Relative	Absolute	(d₁₀₄ Å)	(wt%)	MgCO₃ (mol%)	(d₁₀₄ Å)	(wt%)	MgCO₃ (mol%)
A	Cc	Dol	(Rh) Si	A	Cc	Dol	(Rh) Si	Σ Cbt	(d₁₀₄ Å)	(wt%)	(d₁₀₄ Å)	(wt%)
311-U1325B-
16X-6, 28–30	126.93	28.6		41	59			11	16		27	3.031	4		3.003	7	10.7	2.918	4	2.902	12
311-U1325C-
6X-4, 47–48	221.98	64.6		8	92			5	55		60	3.029	2		2.995	2		2.924	8	2.895	47
11X-1, 119–122	258.29	68.8		93	7			63	5		68				3.004	63	10.4	2.928	5
311-U1326C-
2H-2, 92–93	6.32	63.5		23	77			13	46		60	3.014	13	7.0				2.914	46
9X-2, 92–93	71.52	80.2		1	99			1	73		74	3.031	1							2.900	73
311-U1326D-
2X-1, 72–74 SED	89.12	10.2		99	1			10	tr		10	3.016	6	6.4	2.990	4				2.897	tr
5X-2, 5–6	118.75	67.2		4	96			2	60		62	3.035	1		2.993	1		2.905	60
9X-1, 0–1	155.90	15.6		100				16			16				3.009	16	8.7
17X-3, 0–100	235.90	16.1		100				16			16	3.012	16	7.7
20X-3, 0–1	263.75	33.3		33	7	(41) 18		12	3	(15) 6	36	3.024	3		2.994	9	13.8	2.935	1	2.894	1
311-U1327C-
10H-1, 96–98	75.56	24.0		73	27			17	6		23	3.015	17	6.7						2.902	6
16X-2, 120–150	126.4	11.5		22	6	72		3	1	9	13	3.034	3							2.898	1
17X-CC, 13–18	136.77	66.7		83	17			54	11		66	3.015	54	6.7				2.920	11
18X-2, 0–5	142.35	66.7		88	12			58	8		66				3.003	58	10.7	2.920	8
18X-2, 130–150	143.65	76.0		3	97			2	68		70	3.024	1		2.986	1				2.893	68
19X-1, 75–77 SED	151.85	20.2		73	27			14	5		20	3.030	5	1.7	3.000	9	11.7	2.930	4	2.890	1
20X-1, 0–2	160.80	49.5		98	2			48	1		49	3.016	5		2.988	44	15.8	2.923	1
20X-5, 6–7	166.14	9.4		75	17	7		7	2	1	9				3.008	7	9.1			2.893	2
21X-7, 0–1	178.43	81.6		1	99			1	75		76	3.028	1							2.897	75
311-U1327D-
5X-1, 65–75	126.95	64.2		48	52			30	32		61	3.016	30	6.4						2.903	32
10P-1, 0–92	155.10	85.3		4	96			3	76		79	3.031	1		2.995	2				2.896	76
10P-1, 78–80	155.88	64.2		31	69			19	42		61	3.014	19	7.0						2.900	42
11X-1, 0–8	157.10	67.4		6	94			4	58		62				2.989	4		2.929	11	2.897	48
16X-CC, 10–11	228.40	62.1		98	2			60	2		62	3.019	60	5.4				2.937	1	2.897	tr
16X-CC, 18–19	228.48	68.4		94	6			64	4		68	3.019	64	5.4				2.937	4	2.897	tr
311-U1328B-
1H-2, 8–9	1.58	29.6		82	18			24	5		29				3.009	24	8.7	2.936	4	2.907	1
3X-CC, 0–1	6.20	76.5	30	68	2		23	52	1		76	3.030	1		2.986	51	16.4	2.911	1
4P-1, 0–11	14.50	70.4	13	72	16		9	50	11		69	3.027	3		2.993	46	14.1	2.936	11
6X-1, 0–20 (A)	18.40	70.9	8	82	10		6	58	7		70	3.030	1		2.996	57	13.1	2.939	7
6X-1, 0–20 (B)	18.40	71.9	8	77	14		6	55	10		71	3.020	4		2.989	51	15.4	2.935	10
6X-1, 25–26	18.65	70.4		87	13			61	9		70	3.019	8	5.4	2.984	53	17.1	2.936	9
6X-1, 30–31	18.70	60.2		88	12			52	7		60	3.026	4		2.984	49	17.1	2.935	7
6X-1, 35–36	18.75	41.3		96	4			40	2		41	3.035	5		2.990	35	15.1			2.902	2
6X-1, 36–38 >250 μm	18.76	68.5	11	62	27		8	41	18		67	3.025	8	3.4	2.993	33	14.1	2.935	18
6X-1, 47–50	18.87	70.9		87	13			61	9		70	3.026	4		2.986	57	16.4	2.932	9
311-U1328C-
5P-1, 0–2	92.0?	83.7	46	48	5		39	40	5		83	3.025	1		2.985	39	16.8	2.929	5
19X-4, 18–19	220.21	9.2		96	4			9	tr		9	3.035	2		2.988	7	15.8			2.894	tr
19X-4, 24–26	220.27	14.3		94	6			13	1		14	3.034	4		2.998	9	12.4			2.899	1
19X-4, 26–28	220.29	50.0		80	20			39	10		49	3.023	8	4.0	2.987	31	16.1	2.935	10
19X-4, 32–36	220.35	58.2		92	8			53	5		58	3.016	2		2.998	51	12.4	2.935	5
22X-CC, 12–14	253.70	78.6			100				72		72									2.887	72
22X-CC, 20–21	253.78	36.2		13	87			4	29		34	3.034	4		2.990	1				2.888	29
22X-CC, 20–22	253.78	71.4		2	98			2	64		66	3.032	2							2.890	64
25X-2, 77–79	276.37	59.2		3	97			2	53		55	3.034	tr		2.992	1				2.895	53
311-U1328D-
1X-2, 40–42	1.90?	31.1		91	9			28	3		31	3.030	3		2.994	25	13.8	2.937	2	2.904	1
1X-5, 9–11	6.09?	43.4		97	3			42	1		43	3.025	3		2.992	39	14.4	2.925	1	2.901	1
1X-5, 10–11	6.10?	50.0		97	3			48	1		50	3.030	4		2.993	45	14.1	2.911	1
1X-5, 135–150	7.35?	83.7		81	19			66	16		82				2.989	66	15.4			2.902	16
1X-CC, 0–5	8.10?	39.8		27	73			10	27		37	3.032	4		2.993	7	14.1			2.895	27
2X-2, 30–31	5.80?	67.9		30	70			19	45		64				2.988	19	15.8	2.916	23	2.894	22
2X-CC, 0–5	6.29?	60.7		8	92			4	52		56	3.032	2		2.999	2				2.904	52
311-U1328E-
2X-1, 52–54	7.02	70.4		100				70			70				3.001	70	11.4
8X-1, 57–58	27.27	71.4		93	7			66	5		71	3.030	1		2.989	65	15.4	2.935	5
8X-1, 97–98	27.67	67.3		96	4			64	3		67				2.990	64	15.1	2.931	2	2.897	tr
9X-1, 16–17	36.46	68.4		85	15			57	10		67				2.989	57	15.4	2.927	10
311-U1329C-
4H-3, 138–140	31.48	34.6			100				32		32							2.922	13	2.898	19
4H-3, 140–142	31.50	58.6			100				54		54							2.923	22	2.897	32
5H-3, 129–131	40.89	14.7		100				15			15	3.018	12	5.7	2.991	3
5H-6, 61–62	44.71	26.2		30	70			7	17		25	3.035	4		2.999	3		2.931	2	2.905	15
8H-2, 58–60	59.68	79.6		100				80			80				2.993	80	14.1
8H-2, 62–64	59.72	53.9		100				54			54				2.995	54	13.4
8H-2, 91–93	60.01	7.9		95	5			7	tr		8	3.035	3		2.996	5	13.1			2.893	tr
12H-2, 36–37	97.44	27.7		67	33			18	9		27	3.024	2		2.995	16	13.4	2.933	7	2.907	2
17H-1, 0–2	135.60	67.6		90	10			60	7		67	3.031	23	1.3	3.004	37	10.4	2.944	5	2.913	1
18X-2, 65–66	142.35	75.9		45	55			33	40		72	3.016	33	6.4				2.928	6	2.900	40
18X-2, 69–71	142.39	3.7		10	90			tr	3		3	3.028?	tr							2.900	3
18X-5, 18–20	146.38	89.0			100				82		82									2.897	82
18X-5, 27–29	146.47	80.6			100				74		74									2.895	74
19X-1, 64–66	150.54	33.0		7		93		3		35	38	3.027	3
20X-1, 70–71	160.30	78.0		100				78			78				3.000	78	11.7
20X-1, 89–90	160.49	79.6		100				80			80				3.000	80	11.7
20X-1, 125–126	160.85	81.7		100				82			82				2.997	82	12.8
20X-3, 34–36	162.94	80.6		100				81			81				2.995	81	13.4
20X-5, 34–35	165.44	69.6		100				70			70				2.996	70	13.1
20X-CC, 19–20	166.00	83.2			100				77		77									2.896	77
21X-2, 118–120	171.98	44.0		36	8	56		17	4	26	47	3.013	17	7.4						2.929	4
21X-3, 61–63A	172.91	49.2		96		4		48		2	49	3.019	48	5.4
21X-3, 61–63B	172.91	52.9		100				53			53	3.017	53	6.0
21X-3, 61–63 SED	172.91	51.0		100				51			51	3.017	51	6.0
21X-3, 129–131	173.59	16.2		38		62		7		11	18	3.011	7	8.1
21X-3, 129–131 Bis	173.59	63.5		18		82		13		58	71	3.014	13	7.0
21X-6, 0–30	176.30	81.7		1	99			1	74		75	3.033	1							2.894	74
22X-CC, 72–74	187.75	60.3		100				60			60	3.028	60	2.3
311-U1329E-
4H-5, 48–50	30.48	67.5		11	89			7	56		63	3.031	7	1.3				2.926	4	2.902	52
4H-5, 93–95	30.93	35.6		10	90			3	30		33	3.033	3					2.923	5	2.899	25
4H-5, 113–118	31.13	70.1		1	99			1	64		65	3.033	1					2.929	7	2.901	57
4H-6, 72–74 SED	32.22	42.5		5	95			2	37		39				2.988	2		2.926	4	2.898	33
8Y-1, 35–37	104.35	63.9			100				59		59									2.894	59

Notes: MCM = ManoCalcimeter Mélières apparatus, A = aragonite, Cc = calcite, Dol = dolomite, Rh = "rhodochrosite" (d₁₀₄≈ 2.85 Å), Si = "siderite" (d₁₀₄≈ 2.796 Å), LMMC = low- to medium-magnesium calcite, HMC = high-magnesium calcite, LMD = low-magnesium dolomite, HMD = high-magnesium dolomite. SED = standard sediment sample, Bis = more carbonated part of the sample. ? = dubious depth value, bold = most significant values, tr = traces. For distinction between LMMC, HMC, LMD, and HMC from frequency distribution of d₁₀₄, see Figure F1. MgCO₃ mol% not reported when calcite weight percent was too low.

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