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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
The uncertainty of210Pb derived dates was determined using common sediment event markers: the stable Pb rise, the137Cs rise, and theAmbrosia pollen rise.
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Results revealed that regardless of the lake type, a common sediment spectral feature of a reflectance trough centered near 675?nm, was observed.
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The Late Paleocene-earliest Eocene environmental conditions, coupled with the long-term evolution of larger benthic foraminifera (LBF), seem to have favored this low-light dependent group as common sediment contributors.
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As a result, we have little information about the sources of muds, the most common sediment in the stratigraphic record.
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Points addressed include: (a) selection and preparation of appropriate test fractions, (b) use of benthic organisms for sediment TIE work, and (c) methods for the identification of common sediment contaminants.
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| | Hydrothermal solution sediment differs from the common sediment and is mainly related to hydrothermal fluid type. This paper classifies the hydrothermal solutions into the middle high temperature type and the middle low temperature type. Sedimentary rocks of middle high temperature hydrothermal solution include potash feldspar rock, silicalite, hyalotourmalite, albite rock; and the fluorite rock; and the sedimentary rocks of middle low temperature hydrothermal solution co... | | 热水沉积物不同于普通沉积物 ,主要与热水流体类型有关。文中把热水流体划分为中高温热水流体与中低温热水流体。中高温热水沉积岩包括钾长石岩、硅质岩、电气石岩、钠长石岩、萤石岩 ;中低温热水沉积岩包括碳酸盐、硫酸盐等岩石。钾长石岩是文中确定的一种标准高温热水沉积岩 ,热水沉积钾长石以冰长石和钡长石为主 ;热水沉积碳酸盐矿物一般为铁、镁、锰、钙碳酸盐 ,碳酸盐的形成与CO2 和H2 O的不混溶温度有关 ,一般在不混溶温度 ,即 2 66℃以下生成 ,或在海水补偿线以上形成。热水沉积岩中有热水交代蚀变岩夹层 ,尤其是在高温热水活动区 ,可以交代泥质、钙泥质沉积物形成热水交代沉积岩 ,包括方柱石黑云母岩、透辉石透闪石岩、夕卡岩、绿泥石岩等。根据对霍各乞铜多金属矿床的研究 ,热水交代透辉石透闪石岩的稀土总量较低 ,表现为轻稀土富集 ,重稀土亏损 ,稀土配分模式表现为正Eu异常 | | 文摘来源 | | The whole Boron content in common sediment of Changjiang Estuary was exactly surveyed by ICP - AES. We preliminarily explore three different sample digesting methods and think HF - HCIO4 - HNC3 - H3PO4 is ideal sample digesting method. | | 利用ICP-AES测试方法准确测定长江口水下沉积物中的全量硼,对三种不同的样品消化方法进 行了初步探索,我们认为HF-HCIO4-HNO_3-H_3PO_4消化方法是可靠的理想的样品消化方法。 | | 文摘来源 | |   |
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