| Contrasts in variations of the carbon and oxygen isotopic composition of travertines formed in pools and a ramp stream at Huanglong Ravine, China: Implications for paleoclimatic interpretations | |
| Haijing Wang; Hao Yan; Zaihua Liu | |
| 通讯作者 | Zaihua Liu |
| 2014 | |
| 发表期刊 | Geochimica et Cosmochimica Acta
 |
| 卷号 | 125期号:1页码:34-48 |
| 摘要 | Water samples and modern endogenic (thermogene) travertine calcite deposited on plexiglass substrates in travertine pools and a ramp stream were collected along the Huanglong Ravine, Sichuan, SW China at regular similar to 10 day intervals from early May to early November in 2010, including both wet and dry conditions. Temporal and spatial variations in the delta C-13 and delta O-18 values of the modern travertine were examined to understand their potential for paleoclimatic and paleoenvironmental interpretations. It was found that delta C-13 and delta O-18 of travertine formed in the ramp stream were low in the warm rainy season and high in the cold dry season. Their positive correlation was mainly due to dilution and rainfall seasonal effects on delta C-13 and delta O-18 values, respectively, i.e., low delta C-13 values were caused by dilution by overland flow with depleted delta C-13 values and reduced CO2-degassing in the warm rainy season while low delta O-18 values of travertine were because of low delta O-18 values of water induced by seasonal variation in oxygen isotopic ratios of rainwater. Meanwhile, kinetic effect on oxygen isotopic fractionation during ramp travertine deposition existed and reduced this positive correlation. In contrast, the delta C-13 and delta O-18 values of the pool travertines displayed a converse behavior which was caused mainly by the temperature effect. Low delta O-18 values and high delta C-13 values in the warm rainy season were correlated chiefly with the higher water temperatures. Therefore, the delta C-13 and delta O-18 values of the travertine may be used for paleo-rainfall or paleotemperature reconstruction respectively. This study demonstrates that endogenic travertine, like epigenic (meteogene) tufa, may be a suitable candidate for high-resolution paleoclimatic and paleoenvironmental reconstructions. However, since travertines deposited under differing hydrodynamic conditions (e. g., pools with still water contrasted to fast flow streams) have different climatic responses, it is necessary to check the depositional facies of fossil travertine samples before they can be used for palaeoclimate (temperature and/or rainfall) reconstruction. |
| 学科领域 | 环境地球化学 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.gyig.ac.cn/handle/352002/5157 |
| 专题 | 环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文 |
| 通讯作者 | Zaihua Liu |
| 推荐引用方式 GB/T 7714 | Haijing Wang,Hao Yan,Zaihua Liu. Contrasts in variations of the carbon and oxygen isotopic composition of travertines formed in pools and a ramp stream at Huanglong Ravine, China: Implications for paleoclimatic interpretations[J]. Geochimica et Cosmochimica Acta,2014,125(1):34-48. |
| APA | Haijing Wang,Hao Yan,&Zaihua Liu.(2014).Contrasts in variations of the carbon and oxygen isotopic composition of travertines formed in pools and a ramp stream at Huanglong Ravine, China: Implications for paleoclimatic interpretations.Geochimica et Cosmochimica Acta,125(1),34-48. |
| MLA | Haijing Wang,et al."Contrasts in variations of the carbon and oxygen isotopic composition of travertines formed in pools and a ramp stream at Huanglong Ravine, China: Implications for paleoclimatic interpretations".Geochimica et Cosmochimica Acta 125.1(2014):34-48. |
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