TABLE 10A. Physical and chemical data for samples from core SB1a, St. Bernard Parish, Louisiana. | ||||||||||||||
St. Bernard core SB1a (location: 29o58"53' N, 89o55"27' W; sampled 03/18/1996). | ||||||||||||||
Percent compaction (applied linearly): 6.8. OC, organic carbon. N, nitrogen. Ppt, parts per thousand. SU, pH standard units. | ||||||||||||||
Sample Number |
Material |
Corrected Depth Sample Midpoint (cm)1 |
Total OC (%)2 |
Mineral matter (%)3 |
d13C (ppt) |
Total N (%) |
d15N (ppt) |
C:N ratio |
H2O, Air- dried (%) |
H2O, 65oC (%) |
Bulk Density, Air- dried (g/cm3)4 |
Bulk Density, 65oC (g/cm3)4 |
pH (SU) |
Weight Frac- tion >2 mm (%) |
-- |
fibrous peat5 |
2.7 | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
SB1a-1 | same | 6.8 | 26.2 | 47.6 | -15.8 | 1.5 | 2.46 | 17.0 | 86.7 | 87.6 | 0.109 | 0.108 | 6 | 28.6 |
SB1a-2 | same | 9.6 | 26.4 | 47.3 | -15.0 | 1.3 | 2.91 | 20.0 | 86.4 | 87.3 | 0.107 | 0.106 | 7 | 11.9 |
SB1a-3 | same | 12.3 | 14.8 | 70.3 | -14.6 | 0.9 | 3.29 | 16.2 | 86.6 | 87.7 | 0.102 | 0.100 | 7 | 2.4 |
SB1a-4 | same | 15.1 | 15.0 | 70.1 | -19.8 | 0.9 | 4.03 | 17.7 | 80.8 | 81.7 | 0.162 | 0.160 | 6 | 3.3 |
SB1a-5 | same | 17.8 | 26.0 | 48.1 | -21.5 | 1.6 | 4.71 | 16.7 | 86.7 | 87.9 | 0.101 | 0.100 | 6 | 2.0 |
SB1a-6 | same | 20.5 | 27.8 | 44.4 | -18.3 | 1.7 | 2.12 | 16.5 | 86.5 | 87.7 | 0.097 | 0.096 | 6 | 10.6 |
SB1a-7 | same | 23.3 | 28.8 | 42.3 | -19.2 | 1.8 | 2.14 | 16.3 | 88.7 | 89.6 | 0.083 | 0.082 | 7 | 2.7 |
SB1a-8 | same | 26.0 | 27.3 | 45.3 | -23.0 | 2.0 | 1.97 | 13.7 | 88.5 | 89.4 | 0.091 | 0.090 | 7 | 2.1 |
SB1a-9 | same | 28.8 | 25.6 | 48.8 | -21.7 | 1.7 | 1.86 | 15.1 | 86.3 | 87.3 | 0.106 | 0.105 | 7 | 0.7 |
SB1a-10 | same | 31.5 | 23.7 | 52.6 | -21.0 | 1.4 | 1.60 | 17.3 | 84.6 | 85.7 | 0.127 | 0.125 | 8 | 3.5 |
SB1a-11 | same | 34.2 | 12.3 | 75.4 | -22.8 | 0.8 | 2.64 | 15.6 | 81.8 | 83.0 | 0.153 | 0.151 | 8 | 0.0 |
SB1a-12 | same | 37.0 | 17.3 | 65.4 | -23.1 | 1.2 | 3.12 | 14.2 | 84.2 | 85.3 | 0.130 | 0.129 | 8 | 0.0 |
SB1a-13 | same | 39.5 | 23.1 | 53.8 | -21.1 | 1.4 | 1.14 | 16.7 | 87.2 | 88.2 | 0.109 | 0.108 | 8 | 0.3 |
SB1a-14 | same | 42.2 | 29.8 | 40.4 | -20.2 | 1.7 | 1.01 | 17.1 | 88.7 | 89.6 | 0.090 | 0.090 | 8 | 0.6 |
SB1a-15 | same | 45.0 | 30.0 | 40.1 | -20.5 | 1.8 | 0.78 | 16.3 | 89.5 | 90.4 | 0.078 | 0.077 | 7 | 1.2 |
SB1a-16 | same | 47.7 | 29.7 | 40.7 | -20.3 | 1.8 | 0.70 | 16.4 | 89.7 | 90.5 | 0.080 | 0.079 | 7 | 0.5 |
SB1a-17 | same | 50.4 | 31.2 | 37.6 | -20.2 | 1.8 | 0.30 | 17.7 | 90.6 | 91.1 | 0.075 | 0.074 | 8 | 3.7 |
SB1a-18 | same | 53.1 | 31.7 | 36.6 | -21.6 | 1.9 | 0.58 | 16.8 | 90.3 | 91.1 | 0.081 | 0.080 | 7 | 2.3 |
SB1a-19 | same | 55.8 | 32.8 | 34.5 | -21.3 | 1.9 | 0.45 | 17.3 | 90.3 | 91.1 | 0.084 | 0.083 | 8 | 0.3 |
SB1a-20 | same | 58.6 | 33.4 | 33.2 | -21.6 | 2.0 | 0.39 | 17.0 | 89.4 | 90.3 | 0.086 | 0.085 | 8 | 0.3 |
SB1a-21 | same | 61.3 | 35.4 | 29.2 | -19.5 | 2.1 | -0.18 | 16.8 | 89.4 | 90.4 | 0.091 | 0.090 | 8 | 0.2 |
SB1a-22 | same | 64.0 | 38.1 | 23.8 | -22.0 | 2.1 | -0.92 | 18.0 | 90.7 | 91.6 | 0.087 | 0.086 | 8 | 0.2 |
SB1a-23 | same | 66.7 | 39.2 | 21.5 | -23.0 | 2.2 | -0.56 | 18.0 | 90.9 | 91.7 | 0.094 | 0.093 | 8 | 0.0 |
SB1a-24 | same6 | 69.3 | 36.8 | 26.5 | -23.2 | 2.2 | 0.06 | 16.6 | 90.5 | 91.4 | 0.084 | 0.083 | 7 | 0.7 |
SB1a-25 | same6 | 72.2 | 39.2 | 21.5 | -24.5 | 2.0 | -0.01 | 20.0 | 89.8 | 90.9 | 0.090 | 0.089 | 7 | 5.1 |
SB1a-26 | same6 | 74.9 | 36.0 | 28.0 | -23.2 | 1.8 | -0.79 | 19.8 | 89.7 | 90.8 | 0.083 | 0.082 | 7 | 1.0 |
SB1a-27 | same6 | 77.6 | 32.8 | 34.4 | -21.4 | 1.7 | -0.06 | 19.6 | 86.9 | 88.2 | 0.111 | 0.109 | 7 | 0.9 |
SB1a-28 | same6 | 80.4 | 26.2 | 47.6 | -21.2 | 1.4 | -1.23 | 19.3 | 87.6 | 88.7 | 0.102 | 0.100 | 7 | 6.1 |
SB1a-29 | same6 | 83.1 | 33.4 | 33.2 | -19.5 | 1.7 | -1.04 | 19.8 | 87.8 | 88.9 | 0.099 | 0.098 | 7 | 0.7 |
SB1a-30 | same6 | 85.8 | 33.6 | 32.8 | -20.1 | 1.8 | -1.04 | 19.1 | 88.4 | 89.4 | 0.091 | 0.090 | 7 | 1.4 |
SB1a-31 | same6 | 88.5 | 31.9 | 36.2 | -21.5 | 2.0 | -0.84 | 15.9 | 87.6 | 88.8 | 0.100 | 0.099 | 6 | 4.2 |
SB1a-32 | clay | 91.3 | 31.7 | 36.6 | -22.0 | 1.6 | -1.18 | 19.4 | 85.4 | 86.7 | 0.118 | 0.116 | 6 | 0.0 |
SB1a-33 | peat7 | 94.0 | 25.7 | 48.6 | -22.9 | 1.5 | -0.74 | 17.0 | 84.2 | 85.6 | 0.131 | 0.129 | 7 | 0.0 |
SB1a-34 | peat7 | 96.7 | 23.6 | 52.8 | -22.7 | 1.4 | -0.56 | 16.4 | 84.0 | 85.4 | 0.150 | 0.147 | 7 | 0.0 |
1Corrected depth equals original depth (midpoint of sample interval) multiplied by 1,0743 to correct for compaction. | ||||||||||||||
2Computed as the difference between total carbon and inorganic carbon. Inorganic carbon less than 0.01% for all samples. | ||||||||||||||
3Percent mineral matter computed by: 100 - (2 * organic carbon). | ||||||||||||||
4Bulk-density values reported to three decimal places for visual comparison of air-dried and oven-dried (65oC) values. | ||||||||||||||
5Top 2 inches (5.08 cm) discarded in the field. No sample for corrected depth at 2.7 cm. | ||||||||||||||
6More compact (dense) than overlying interval. | ||||||||||||||
7Peat below clay lense is denser and finer than peat above clay lense. | ||||||||||||||
Source: U.S. Geological Survey Open-File Report 98-36. Carbon storage and late Holocene chronostratigraphy of a Mississippi River deltaic marsh, St. Bernard Parish, Louisiana (H.W. Markewich, ed.). |