作者简介:赵绍华(1987-),男,安徽亳州人,博士研究生,主要从事海洋沉积与古气候研究.E-mail:zsh55228@126.com
收稿日期: 2017-02-08
修回日期: 2017-06-28
网络出版日期: 2017-07-20
基金资助
国家自然科学基金重大研究计划集成项目“南海深海沉积过程与机制”(编号:91528304);国家自然科学基金重点项目“南海中央海盆中新世以来深水沉积作用及其区域构造与环境演化意义”(编号:41530964)资助
版权
A Study of Pretreatment Methods for Terrigenous Grain-Size Analysis of Marine Sediments
First author:Zhao Shaohua (1987-), male, Bozhou City, Anhui Province, Ph.D student. Research areas include marine sedimentoloy and palaeoclimatology.E-mail:zsh55228@126.com
Received date: 2017-02-08
Revised date: 2017-06-28
Online published: 2017-07-20
Supported by
Project supported by the National Natural Science Foundation of China “Deep-sea sedimentation process and mechanism in the South China Sea” (No.91528304) and “Deepwater sedimention since the miocene in the central basin of the South China Sea and its regional tectonic and environmental evolution significance” (No.41530964)
Copyright
如何有效去除海洋沉积物中的非陆源物质,同时又能完好保存陆源碎屑,是获得陆源碎屑粒度变化信息的先决条件。利用南海MD190航次的深海岩芯沉积物样品,进行了不同预处理条件下的生源物质去除效果和陆源碎屑粒度分析结果的对比研究。结合显微镜和扫描电镜观察,获得了海洋沉积物陆源碎屑粒度分析预处理方法的新认识。结果显示,对于海洋沉积物中的有机质、碳酸盐和生物硅3种生源组分,依次使用浓度为30%的H2O2水浴60 ℃震荡3 h,0.5%的HCl充分反应1 h,2 mol/L的Na2CO3水浴85 ℃震荡5 h,可以有效去除,并能兼顾去除效率以及相对完好地保存陆源碎屑。研究认为,针对不同类型的沉积物样品进行陆源碎屑粒度分析时,应考虑生源碎屑对粒度结果的实际影响,从而选择合适的预处理方案。即在确保陆源碎屑的粒度分析结果更接近真实分布的情况下,沉积物样品的预处理步骤越少越好,并非一定要去除所有的生源成分。如当生物硅含量低于2%时,其对陆源碎屑粒度分析结果的影响很小,可不用去除。另外,超声可导致部分陆源碎屑的破碎,在粒度分析预处理过程中全程不宜使用。
赵绍华 , 刘志飞 . 海洋沉积物陆源碎屑粒度分析预处理方法研究[J]. 地球科学进展, 2017 , 32(7) : 769 -780 . DOI: 10.11867/j.issn.1001-8166.2017.07.0769
The prerequisite for obtaining variations of terrigenous grain-size of marine sediments is how to effectively remove non-terrigenous matters and preserve terrigenous particles synchronously. Combined with observations under biological microscope and scanning electron microscope, a comparative study of biogenic debris removal effect and terrigenous grain-size analysis under different pretreatment condition was performed on core sediments, which were retrieved in the South China Sea during the MD190 cruise. Our new results showed that the main three biogenic particles, namely, organic matter, carbonate, and opal in marine sediments could be removed effectively by 30% H2O2 in a stirring water bath at 60 ℃ for 3 h, 0.5% HCl for 1 h, and 2 mol/L Na2CO3 in a stirring water bath at 85 ℃ for 5 h, in turn. Such pretreatments achieved the goals of biogenic debris removal efficiency and relatively well-preserved terrigenous particles. Prior to selecting an appropriate pretreatment method, this study suggested that the actual effects of biogenic detritus on grain-size results of diverse marine sediment samples should be taken into account. If the laboratory data are ensured to be closer to the natural grain-size distribution of terrigenous particles, the removals of all biogenic debris are not always needed, and the less pretreatment processes the better. For example, opal particles have little effect on terrigenous grain-size distribution when their percentage is lower than 2%. Thus, there is no use to remove them from marine sediments before laboratory grain-size analysis of terrigenous particles. Additionally, ultrasonic is not suggested through the whole process of terrigenous grain-size analysis because the strong energy of ultrasonic can lead to the fragmentation of some fragile terrigenous particles.
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