| 岩溶洞穴现代沉积间断的影响因素研究--以河南鸡冠洞为例 |
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| 引用本文： | 孙喆,杨琰,施强,张萍,梁沙,张娜,刘肖,聂旭东,彭涛.岩溶洞穴现代沉积间断的影响因素研究--以河南鸡冠洞为例[J].沉积学报,2017,35(1):93-101. |
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| 作者姓名： | 孙喆 杨琰 施强 张萍 梁沙 张娜 刘肖 聂旭东 彭涛 |
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| 作者单位： | 1.西南大学地理科学学院/三峡库区生态环境教育部重点实验室, 重庆 400715; |
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| 基金项目： | 国家自然科学基金项目，高等学校博士学科点专项科研基金项目，中央高校基本科研业务费专项(XDJK2011B004)[National Natural Science Foundation of China |
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| 摘 要： | 岩溶洞穴次生沉积物--石笋因其独有的高精度测年和高分辨率记录的优势已越来越成为过去全球变化研究中重要的支柱。进行洞穴碳酸盐沉积机理研究对于理解石笋沉积速率，结晶形态、准确解译气候替代指标和现代洞穴合理保护具有重要意义。以我国南北交汇带亚洲季风敏感区河南鸡冠洞为例，通过对2010-2015年连续6个水文年对鸡冠洞滴水和碳酸盐沉积的监测发现:①洞内滴水水化学指标与沉积速率表现出很好的一致性，雨季大气降水增加，气温升高，生物活动加强，土壤CO2含量增加，滴水滴速、Ca2+、HCO3-、电导率（EC）和沉积速率同时增加，旱季反之；洞内CO2对方解石沉积的抑制作用被滴水饱和度掩盖。②受2012-2013年年降雨量显著减少的影响，水岩作用减弱，2014年滴水饱和度降至最低，出现为期一年的沉积间断，直至2014年下半年降水增加，于11月重新接收到方解石沉积。③自2013年下半年开始，受人为淋滤洞穴影响，滴水NO3-上升数十倍，模拟实验显示其对CaCO3溶解的能力较之前提高约60%，表明NO3-对方解石沉积存在抑制作用，这可能是个别月份滴水饱和度高却没有回收到CaCO3沉积的原因，建议景区在进行补水的同时要考虑水质对岩溶作用的影响。
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| 关 键 词： | 岩溶洞穴 现代沉积间断 水岩作用 NO3-异常 河南鸡冠洞 |
| 收稿时间： | 2016-02-14 |
Study on the Influence Factors of Modern Speleothem Hiatus: A case from Jiguan Cave,Henan |
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| Abstract: | Stalagmite has increasingly become an important part of global change research due to its exclusive advantages of precise dating and high-resolution records. The study of carbonate sedimentary mechanism is significant of understanding the stalagmite sedimentation rate, crystal morphology and precisely interpreting climate proxies, and reasonable protection of modern cave. Jiguan Cave in Henan Province is selected as the example in Asian monsoon-sensitive area in the north-south China intersection, we have monitored the drips and carbonate deposition for 6 consecutive hydrological years from 2010 to 2015, and found:(1)The hydrochemical indices of drips have the similar pattern compared with deposition rate. The biological activity and soil CO2 are strengthened in wet season due to the increase of precipitation and air temperature, as a result, the dripping rate, Ca2+, HCO3-, EC and deposition rate of drips also increase, dry season shows opposite pattern. The inhibition of cave CO2 to calcite deposition is masked by drip saturation. (2)The water-rock effect goes weak for the impact of precipitation markedly decreasing from 2012-2013, and saturation of drips became minimum in 2014 when calcite hiatus also occurred. The deposition was collected again in Nov.2014 becausing increasing rain in the latter half of the year. (3)The cave was washed by artificial leaching and NO3- of drips rised more than 10 times. Simulation result shows that~60% CaCO3 can be more dissolved than before, which suggests the inhibition of NO3- to calcite deposition. This may be the reason why the calcite hiatus happened during the drip was with high degree of saturation in some months. It is suggested that the water quality should be taken into consideration in the process of water supply. |
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| Keywords: | karst cave modern speleothem hiatus water-rock effect NO3-anomaly Jiguan Cave of Henan Province |
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