Effect of Hydrothermal Activity on Organic Matter Enrichment of Shale: A Case Study of the Upper Ordovician and the Lower Silurian in the Lower Yangtze, South China
Abstract
:1. Introduction
2. Geological Settings
2.1. Sedimentary and Stratigraphy
2.2. Tectonic Evolution
3. Samples, Experiments, and Data Source
4. Results and Discussion
4.1. Stratigraphic Sequence
4.2. Hydrothermal Activity
4.2.1. Oxygen Isotope Analysis
4.2.2. Excess Silicon Analysis
4.2.3. Intensity of Hydrothermal Activity
4.3. Mechanism of Organic Matter Enrichment
4.3.1. Redox Environments
4.3.2. Paleoproductivity
4.3.3. Model of Regional Organic Matter Enrichment
5. Conclusions
- Two 3rd-order sequences are identified in the Xinkailing Fm. and the first member of the Lishuwo Fm., when the paleotemperature of seawater was 62.7–79.2 °C, verifying the existence of hydrothermal activity. Within these units, siliceous minerals are terrigenous and hydrothermal, and the intensity of hydrothermal activity decreases upwards, being strongest during TST1.
- Hydrothermal activity promotes paleoproductivity and reduces bottom waters, which are favorable for the preservation of organic matter. In the Late Ordovician, the active hydrothermal activity promotoed high paleoproductivity and weak-oxidizing to poor-oxygen environments and resulted in the deposition of organic-rich shale during TST1. Subsequently, hydrothermal activity weakened during RST1, TST2, and RST2, paleoproductivity decreased and oxidation increased, leading to a relatively lower TOC in the shale of these intervals.
- In the Upper Ordovician and Lower Silurian in Lower Yangtze, the stratigraphically favorable interval is TST1, which has a relatively higher TOC. Geographically, the favorable area is an active area of hydrothermal activity located near the connection of the plates, the Yangtze and the Cathaysia.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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No. | Fm. | Depth/m | No. | Fm. | Depth/m | No. | Fm. | Depth/m |
---|---|---|---|---|---|---|---|---|
1 | Lishuwo | 1279.8 | 15 | Lishuwo | 1322.1 | 29 | Xinkailing | 1340.7 |
2 | Lishuwo | 1282.5 | 16 | Lishuwo | 1323.9 | 30 | Xinkailing | 1341.2 |
3 | Lishuwo | 1290.2 | 17 | Lishuwo | 1326.9 | 31 | Xinkailing | 1343.3 |
4 | Lishuwo | 1294.8 | 18 | Lishuwo | 1328.7 | 32 | Xinkailing | 1343.7 |
5 | Lishuwo | 1296.9 | 19 | Lishuwo | 1329.0 | 33 | Xinkailing | 1345.2 |
6 | Lishuwo | 1298.9 | 20 | Lishuwo | 1330.3 | 34 | Xinkailing | 1345.9 |
7 | Lishuwo | 1302.7 | 21 | Lishuwo | 1331.2 | 35 | Xinkailing | 1347.3 |
8 | Lishuwo | 1304.3 | 22 | Lishuwo | 1332.0 | 36 | Xinkailing | 1347.5 |
9 | Lishuwo | 1309.7 | 23 | Lishuwo | 1334.7 | 37 | Xinkailing | 1349.0 |
10 | Lishuwo | 1312.7 | 24 | Lishuwo | 1335.9 | 38 | Xinkailing | 1349.8 |
11 | Lishuwo | 1314.9 | 25 | Lishuwo | 1337.1 | 39 | Xinkailing | 1350.5 |
12 | Lishuwo | 1317.1 | 26 | Lishuwo | 1338.0 | 40 | Xinkailing | 1351.4 |
13 | Lishuwo | 1319.0 | 27 | Xinkailing | 1339.4 | 41 | Xinkailing | 1353.8 |
14 | Lishuwo | 1320.4 | 28 | Xinkailing | 1339.7 | 42 | Xinkailing | 1357.3 |
No. | Fm. | Depth/m | No. | Fm. | Depth/m | No. | Fm. | Depth/m |
---|---|---|---|---|---|---|---|---|
1 | Lishuwo | 1284.91 | 32 | Lishuwo | 1301.60 | 63 | Lishuwo | 1338.56 |
2 | Lishuwo | 1285.11 | 33 | Lishuwo | 1302.10 | 64 | Xinkailing | 1343.27 |
3 | Lishuwo | 1285.21 | 34 | Lishuwo | 1302.55 | 65 | Xinkailing | 1343.78 |
4 | Lishuwo | 1285.89 | 35 | Lishuwo | 1304.27 | 66 | Xinkailing | 1344.32 |
5 | Lishuwo | 1285.91 | 36 | Lishuwo | 1304.93 | 67 | Xinkailing | 1344.90 |
6 | Lishuwo | 1286.14 | 37 | Lishuwo | 1306.41 | 68 | Xinkailing | 1345.52 |
7 | Lishuwo | 1286.44 | 38 | Lishuwo | 1310.39 | 69 | Xinkailing | 1346.08 |
8 | Lishuwo | 1286.70 | 39 | Lishuwo | 1310.48 | 70 | Xinkailing | 1346.60 |
9 | Lishuwo | 1286.80 | 40 | Lishuwo | 1320.41 | 71 | Xinkailing | 1347.05 |
10 | Lishuwo | 1286.84 | 41 | Lishuwo | 1320.73 | 72 | Xinkailing | 1348.31 |
11 | Lishuwo | 1290.04 | 42 | Lishuwo | 1320.79 | 73 | Xinkailing | 1349.54 |
12 | Lishuwo | 1290.16 | 43 | Lishuwo | 1320.91 | 74 | Xinkailing | 1349.90 |
13 | Lishuwo | 1290.32 | 44 | Lishuwo | 1320.98 | 75 | Xinkailing | 1350.28 |
14 | Lishuwo | 1290.38 | 45 | Lishuwo | 1321.09 | 76 | Xinkailing | 1351.02 |
15 | Lishuwo | 1290.54 | 46 | Lishuwo | 1321.61 | 77 | Xinkailing | 1351.27 |
16 | Lishuwo | 1290.89 | 47 | Lishuwo | 1321.94 | 78 | Xinkailing | 1352.08 |
17 | Lishuwo | 1290.96 | 48 | Lishuwo | 1322.44 | 79 | Xinkailing | 1353.27 |
18 | Lishuwo | 1291.09 | 49 | Lishuwo | 1324.63 | 80 | Xinkailing | 1353.33 |
19 | Lishuwo | 1291.26 | 50 | Lishuwo | 1325.43 | 81 | Xinkailing | 1354.30 |
20 | Lishuwo | 1291.34 | 51 | Lishuwo | 1329.46 | 82 | Xinkailing | 1354.67 |
21 | Lishuwo | 1291.54 | 52 | Lishuwo | 1330.03 | 83 | Xinkailing | 1354.70 |
22 | Lishuwo | 1291.74 | 53 | Lishuwo | 1332.82 | 84 | Xinkailing | 1355.73 |
23 | Lishuwo | 1292.00 | 54 | Lishuwo | 1333.73 | 85 | Xinkailing | 1356.30 |
24 | Lishuwo | 1292.79 | 55 | Lishuwo | 1333.80 | 86 | Xinkailing | 1357.75 |
25 | Lishuwo | 1292.80 | 56 | Lishuwo | 1334.42 | 87 | Xinkailing | 1358.10 |
26 | Lishuwo | 1293.14 | 57 | Lishuwo | 1335.11 | 88 | Xinkailing | 1358.40 |
27 | Lishuwo | 1295.15 | 58 | Lishuwo | 1335.86 | 89 | Xinkailing | 1359.04 |
28 | Lishuwo | 1295.55 | 59 | Lishuwo | 1336.42 | 90 | Xinkailing | 1359.53 |
29 | Lishuwo | 1298.18 | 60 | Lishuwo | 1336.95 | 91 | Xinkailing | 1359.93 |
30 | Lishuwo | 1298.85 | 61 | Lishuwo | 1337.44 | |||
31 | Lishuwo | 1301.03 | 62 | Lishuwo | 1338.15 |
No. | Fm. | Depth/m |
---|---|---|
1 | Xinkailing | 1358 |
2 | Xingkailin | 1344 |
3 | Lishuwo | 1327 |
No. | δ18O/‰ | Paleotemperature of Seawater (°C) (by Equation (1)) | Paleotemperature of Seawater (°C) (by Equation (2)) |
---|---|---|---|
1 | 23.7 | 65.2 | 71.8 |
2 | 21.9 | 77.1 | 79.2 |
3 | 24.1 | 62.7 | 70.2 |
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Huang, Y.; Jiang, Z.; Zhang, K.; Song, Y.; Jiang, S.; Liu, W.; Wen, M.; Li, X.; Xie, X.; Liu, T.; et al. Effect of Hydrothermal Activity on Organic Matter Enrichment of Shale: A Case Study of the Upper Ordovician and the Lower Silurian in the Lower Yangtze, South China. Minerals 2018, 8, 495. https://doi.org/10.3390/min8110495
Huang Y, Jiang Z, Zhang K, Song Y, Jiang S, Liu W, Wen M, Li X, Xie X, Liu T, et al. Effect of Hydrothermal Activity on Organic Matter Enrichment of Shale: A Case Study of the Upper Ordovician and the Lower Silurian in the Lower Yangtze, South China. Minerals. 2018; 8(11):495. https://doi.org/10.3390/min8110495
Chicago/Turabian StyleHuang, Yizhou, Zhenxue Jiang, Kun Zhang, Yan Song, Shu Jiang, Weiwei Liu, Ming Wen, Xin Li, Xuelian Xie, Tianlin Liu, and et al. 2018. "Effect of Hydrothermal Activity on Organic Matter Enrichment of Shale: A Case Study of the Upper Ordovician and the Lower Silurian in the Lower Yangtze, South China" Minerals 8, no. 11: 495. https://doi.org/10.3390/min8110495