寻求深海碳酸盐沉积含量的物理标志

黄维; 刘志飞; 陈晓良; 汪品先

寻求深海碳酸盐沉积含量的物理标志

同济大学海洋地质教育部重点实验室, 上海 200092

基金项目:

国家自然科学基金重大项目 49999560

国家重点基础发展规划研究项目 G2000078500

详细信息

作者简介:
黄维(1972-), 男, 讲师, 1999年毕业于同济大学, 获理学硕士学位, 目前从事古海洋学以及沉积数值模拟研究.E-mail: huangwei@mail.tongji.edu.cn

中图分类号: P736
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出版历程
- 收稿日期: 2002-05-08
- 刊出日期: 2003-03-25

Searching Physical Indicators of Carbonate Contents of Deep Sea Sediments

Key Laboratory of Marine Geology, Ministry of Education, Tongji University, Shanghai 200092, China

摘要

摘要: 运用岩心物理性质求取深海碳酸盐沉积的相对含量, 是古海洋学研究中一种“多快好省”的办法, 在低分辨率研究中取得成功, 但在较高分辨率的研究中精度问题十分突出. 采用大洋钻探(ODP) 184航次船上颜色反射率和磁化率数据, 结合实验室碳酸盐化学分析实测结果, 运用最小二乘法等数理分析方法, 分别建立颜色反射率和磁化率与碳酸盐含量之间的拟合方程, 估算碳酸盐含量. 结果表明, 根据颜色反射率蓝色光波段值及其平方作为控制变量来拟合的碳酸盐含量, 同实测值具有较高的一致性, 误差较小; 但是, 用磁化率推算的碳酸盐含量同实测值比较则误差相当大. 用岩心物理性质推测的拟合方程是在开展一定量实测分析的基础上建立的, 不同站位的这种拟合关系不能套用, 只有当其他影响成分含量相当稳定或有规律变化时, 运用岩心物理性质求取深海碳酸盐沉积含量的方法才具有相当高的应用价值.
- 碳酸盐 /
- 颜色反射率 /
- 磁化率 /
- 南海 /
- 大洋钻探(ODP)184航次
Abstract: Physical property of deep-sea sediment core is useful to make an efficient calculation of the percent carbonate, which has been successful in low resolution research rather than in high resolution research. Multiple regression equations are generated based on the comparing diffuse reflectance and magnetic susceptibility records from ODP Leg 184 with carbonate contents measured in our laboratory. It is found that percent carbonate estimated with diffuse reflectance is closer to the measured one than that estimated with magnetic susceptibility, and the multiple regression equation varies in different sites.
- carbonate /
- color reflectance /
- magnetic susceptibility /
- South China Sea /
- ODP Leg 184

HTML全文

图 1 南海ODP 1143 (a), 1148 (b) 站实测碳酸盐含量、颜色反射率和磁化率及其推算的碳酸盐含量

w₁.碳酸盐含量实测值; L^*.颜色反射率; w₃.由颜色反射率推算的碳酸盐含量; κ.磁化率; w₅.由磁化率推算的碳酸盐含量.实测碳酸盐含量据文献[16], 颜色反射率和磁化率据文献[14], 均进行了5点平滑

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图 2 南海ODP 1148站实测碳酸盐含量与颜色反射率推算的碳酸盐含量的相关性

显示两者相关系数达80%

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表 1 ODP 1148站通过最小二乘法拟合的c值

Table 1. Coffieteuts for the ODP site 1148

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