Research Article
Early Diagenesis Records and Pore Water Composition of Methane-Seep Sediments from the Southeast Hainan Basin, South China Sea
Table 1
Major mineral components and their semiquantification results in sediments from the Southeast Hainan Basin (
).
| No. | Depth (cm) | Illite | Gypsum | Kaolinite | Brucite | Witherite | Barite | Anhydrite | Quartz | Microcline | Albite | Ba-calcite | Calcite | Mg-calcite | Siderite | Magnesite | Vaterite | Pyrite | Maghemite |
| T1-44 | 20 | 24.2 | | 11.9 | | | 22.3 | | 13.1 | | 2.3 | | 7.9 | | | 3.5 | 3.4 | 11.5 | | T1-46 | 35 | 25.4 | | 13.4 | 7.0 | 1.3 | 22.5 | 3.5 | 12.0 | | 2.7 | | 8.9 | | | 3.5 | | | | T1-36 | 85 | 28.7 | | 14.2 | | | 25.9 | | 13.8 | | 2.6 | 5.8 | 6.0 | | | 3.0 | | | | T1-38 | 100 | 25.2 | | 9.1 | | | 30.2 | | 14.6 | | 2.5 | | 8.7 | | 1.9 | 3.3 | | 4.5 | | T1-28 | 200 | 30.3 | | 11.7 | 9.6 | | 25.0 | | 10.4 | | | 4.4 | 3.7 | | | | | 4.9 | | T1-30 | 216 | 20.8 | | 13.4 | 3.8 | | 28.0 | | 10.7 | | | 5.4 | 5.9 | | | 3.7 | | 8.3 | | T1-32 | 230 | 26.4 | | 13.4 | 10.0 | | 28.9 | | 9.1 | | | 3.0 | 5.3 | | | | | 3.9 | | T1-20 | 320 | 27.4 | | 16.2 | | | 28.2 | | 14.5 | | 4.0 | | 9.6 | | | | | | | T1-22 | 336 | 24.5 | | 10.7 | 11.6 | | 27.1 | | 10.5 | | 2.3 | | 3.7 | | | 4.6 | | 5.1 | | T1-24 | 355 | 19.7 | | 11.1 | 10.4 | 16.0 | | 2.5 | 13.4 | | 1.6 | | 11.7 | 2.3 | | 3.1 | | 3.3 | 5.0 | T1-12 | 380 | 24.41 | 3.08 | 11.37 | | | | 2.94 | 26.50 | | 3.27 | | 25.16 | 2.51 | | | | 0.76 | | T1-14 | 395 | 43.1 | | 16.7 | 7.1 | | 15.3 | | 6.4 | | 2.3 | | 3.3 | 1.8 | | | | 4.0 | | T1-16 | 415 | | | 16.6 | | | 37.8 | 6.6 | 13.5 | | 6.2 | | 7.6 | 2.7 | | | | 9.0 | | T1-2 | 440 | 20.8 | | 17.9 | | | | 2.8 | 29.4 | | 3.4 | | 19.9 | 3.1 | | 2.7 | | | | T1-4 | 450 | 26.1 | 4.3 | 15.0 | | | | | 26.4 | | 3.6 | | 19.0 | 2.9 | | 2.6 | | | | T1-6 | 465 | 20.3 | | 14.8 | | | 1.7 | | 30.0 | 9.9 | 3.3 | | 18.2 | | | | | 1.8 | | T1-8 | 475 | 22.1 | | 11.3 | | | | 3.2 | 29.8 | 8.0 | 3.8 | | 15.1 | 2.3 | | 2.6 | | 1.7 | |
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