海洋沉积物中自生黄铁矿研究的体视镜挑选与铬还原处理方法对比——来自南海北部陆坡Site 4B站位的研究

林杞; 王家生; 卜庆涛; 李超; 林荣骁; 孙飞; 张卫坤

海洋沉积物中自生黄铁矿研究的体视镜挑选与铬还原处理方法对比——来自南海北部陆坡Site 4B站位的研究

林杞^1,2,
王家生^1,2,,
卜庆涛²,
李超¹,
林荣骁²,
孙飞²,
张卫坤²

1.
生物地质与环境地质国家重点实验室武汉 430074;
2.
中国地质大学(武汉)地球科学学院武汉 430074

基金项目: 国家重点基础研究发展计划(973,2011CB808805,2009CB219506)、国家自然科学基金(批准号:41172102,41472085)、南海天然气水合物成矿理论及分布预测研究子课题(编号:GZH20110030-50603,-6WX02)与东华理工大学核资源与环境教育部重点实验室联合资助

详细信息

作者简介:
林杞男 1987年出生博士研究生海洋天然气水合物沉积学和矿物学 E-mail: yiyanglinqi@126.com

通讯作者:
王家生男博士生导师 E-mail: js-wang@cug.edu.cn

中图分类号: P736.2

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Method Comparison of Authigenic Pyrite Analysis between the Handpicking under Binocular Microscope and the CRS in Shallow Cored Marine Sediments: An example from the Site 4B, northern continental slope of the South China Sea

1.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074;
2.
Faculty of Earth Science, China University of Geosciences, Wuhan 430074

摘要

摘要: 黄铁矿是大陆边缘海相沉积物中常见的自生矿物类型之一,对沉积环境变化、早期成岩作用和天然气水合物均有重要的指示意义.体视镜挑选和铬还原处理两种方法是目前研究海相沉积物中自生黄铁矿的最常用方法,但少有对这二种方法进行对比研究的报道.本文采用上述二种方法对取自南海北部陆坡神狐海域Site 4B站位的浅表层沉积物中的黄铁矿进行了测试与分析,结果表明二种方法获得的黄铁矿相对含量及其硫同位素值的主要变化特征均有良好的同步性,且二种方法结果的差值基本保持在一定的误差范围内,说明任何一种方法都可以有效地反映沉积物中黄铁矿相对含量及其硫同位素值的主要变化规律.然而,上述二种方法从操作性和经济实用性上存在较明显的差别,铬还原处理方法从理论上更为科学和准确,但是体视镜挑选方法具有明显的易操作、经济性和实用性.本文研究后建议在实际应用过程中不妨将两种方法结合,即初期样品处理采用体视镜挑选方法,获得整个沉积物中黄铁矿产出变化规律,后期对变化明显区段采用铬还原处理方法进行更精确研究.
- 自生黄铁矿 /
- 铬还原处理 /
- 体视镜挑选 /
- 南海北部陆坡 /
- 天然气水合物
Abstract: As one of the most common authigenic minerals in continental margin sediments, pyrite has been proved as an important indicator of sedimentary environment, early diagenesis and gas hydrates. So far, the identification and handpicking under binocular microscope and the analysis of Chromium reduction sulfur (CRS) are the two most commonly used methods for the analysis of authigenic pyrite in marine sediments, however there is yet rare study made for comparisons of those two methods. In this paper, both methods are employed to the shallow sediments of Site 4B, northern continental slope of the South China Sea for comparison in authigenic pyrite analysis. The results show that 1) the pyrite contents and their sulfur isotopic values obtained by both methods exhibit great synchronicity in the major variations; 2) the discrepancies between two methods are limited to a certain small range with little changes throughout the sampled interval. Therefore, both methods can inform us of the major changes of pyrite contents and their sulfur isotopic values in the studied sediments. However, both methods have their advantages and disadvantages. While theoretically, CRS seems more scientific and accurate, observation and recognition under the binocular microscope are much easier operated and more economical and practical. We suggest that it might be a better choice to combine both methods in the practice of analyzing authigenic pyrite in marine sediments, which means that the binocular microscope for the overall variation of pyrite concentration and CRS for more precise and versatile analysis within the critical intervals with major changes.
- authigenic pyrite /
- Chromium reduction sulfur /
- binocular microscope /
- northern slope of the SCS /
- gas hydrate

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参考文献(34)

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海洋沉积物中自生黄铁矿研究的体视镜挑选与铬还原处理方法对比——来自南海北部陆坡Site 4B站位的研究

作者简介:
林杞男 1987年出生博士研究生海洋天然气水合物沉积学和矿物学 E-mail: yiyanglinqi@126.com

通讯作者:
王家生男博士生导师 E-mail: js-wang@cug.edu.cn

计量

Method Comparison of Authigenic Pyrite Analysis between the Handpicking under Binocular Microscope and the CRS in Shallow Cored Marine Sediments: An example from the Site 4B, northern continental slope of the South China Sea

计量

目录

海洋沉积物中自生黄铁矿研究的体视镜挑选与铬还原处理方法对比——来自南海北部陆坡Site 4B站位的研究

1. 生物地质与环境地质国家重点实验室武汉 430074;

2. 中国地质大学(武汉)地球科学学院武汉 430074

作者简介:
林杞男 1987年出生博士研究生海洋天然气水合物沉积学和矿物学 E-mail: yiyanglinqi@126.com

通讯作者: 王家生男博士生导师 E-mail: js-wang@cug.edu.cn

English Abstract

Method Comparison of Authigenic Pyrite Analysis between the Handpicking under Binocular Microscope and the CRS in Shallow Cored Marine Sediments: An example from the Site 4B, northern continental slope of the South China Sea

1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074;

2. Faculty of Earth Science, China University of Geosciences, Wuhan 430074

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海洋沉积物中自生黄铁矿研究的体视镜挑选与铬还原处理方法对比——来自南海北部陆坡Site 4B站位的研究

作者简介: 林杞 男 1987年出生 博士研究生 海洋天然气水合物沉积学和矿物学 E-mail: yiyanglinqi@126.com

通讯作者: 王家生 男 博士生导师 E-mail: js-wang@cug.edu.cn

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Method Comparison of Authigenic Pyrite Analysis between the Handpicking under Binocular Microscope and the CRS in Shallow Cored Marine Sediments: An example from the Site 4B, northern continental slope of the South China Sea

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海洋沉积物中自生黄铁矿研究的体视镜挑选与铬还原处理方法对比——来自南海北部陆坡Site 4B站位的研究

1. 生物地质与环境地质国家重点实验室 武汉 430074; 2. 中国地质大学(武汉)地球科学学院 武汉 430074

作者简介: 林杞 男 1987年出生 博士研究生 海洋天然气水合物沉积学和矿物学 E-mail: yiyanglinqi@126.com

通讯作者: 王家生 男 博士生导师 E-mail: js-wang@cug.edu.cn

English Abstract

Method Comparison of Authigenic Pyrite Analysis between the Handpicking under Binocular Microscope and the CRS in Shallow Cored Marine Sediments: An example from the Site 4B, northern continental slope of the South China Sea

1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074; 2. Faculty of Earth Science, China University of Geosciences, Wuhan 430074

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目录

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联系我们

作者简介:
林杞男 1987年出生博士研究生海洋天然气水合物沉积学和矿物学 E-mail: yiyanglinqi@126.com

通讯作者:
王家生男博士生导师 E-mail: js-wang@cug.edu.cn

1. 生物地质与环境地质国家重点实验室武汉 430074;

2. 中国地质大学(武汉)地球科学学院武汉 430074

作者简介:
林杞男 1987年出生博士研究生海洋天然气水合物沉积学和矿物学 E-mail: yiyanglinqi@126.com

通讯作者: 王家生男博士生导师 E-mail: js-wang@cug.edu.cn

1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074;

2. Faculty of Earth Science, China University of Geosciences, Wuhan 430074