Alkaline leaching characteristics of biogenic opal in the Eocene sedim ents from the central Arctic Ocean : A case study in the ACEX cores
Alkaline leaching characteristics of biogenic opal in the Eocene sedim ents from the central Arctic Ocean : A case study in the ACEX cores
复制标题
北冰洋中部始新世沉积物中生物蛋白石的碱浸特征：ACEX 岩心的案例研究
DOI：
10.1007/s10872-014-0227-7
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发表时间：
2014
影响因子：
2.3
通讯作者：
Christoph Vogt
中科院分区：
文献类型：
--
作者：
Shinya Iwasaki;Kozo Takahashi;Yusuke Ogawa;Seiichiro Uehara;Christoph Vogt
准确了解海洋沉积岩芯中生物蛋白石的保存程度对古海洋学重建具有重要意义。碱浸法因其简便、快速而被广泛应用于生物蛋白石的分析。本文提出了一种测定北极取芯考察沉积物中生物蛋白石含量的方法。北冰洋中部中始新世沉积物中存在Na2CO3溶液对生物蛋白石浸出不充分的问题。XRD分析表明，这种抗碱性是生物蛋白石轻微成岩作用的结果。为了解决这一问题，提出了一种利用2 M NaOH溶液的碱浸方法，用于精确测量北极中部始新世沉积物中生物蛋白石的%。此外，通过NaOH溶液从成石物质的溶解速率被测量，以校正%生物蛋白石值。
Accurate knowledge of the extent of biogenic opal preservation in marine sediment cores is important for paleoceanographic reconstructions. The alkaline leaching method is widely employed for %biogenic opal analysis due to its ease and speed. In this study, a revised method for measuring %biogenic opal in sediment from arctic coring expedition samples was suggested. The studied middle Eocene sediments from the central Arctic Ocean presented a problem in insufficiently leaching biogenic opal with a Na2CO3solution. Based on XRD analysis, it was suggested that such an alkaline resistance results from slight diagenesis of biogenic opal. In order to solve this problem, an alkaline leaching method utilizing a 2 M NaOH solution was suggested for the accurate measurement of %biogenic opal in the Eocene sediments from the central Arctic. Furthermore, dissolution rates from lithogenic matter by NaOH solution were measured in order to correct the %biogenic opal values.