| 中太平洋结壳区海山燧石岩成因研究 |
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| 引用本文： | 陈建林,马维林,高水土,陶春辉,初凤友,武光海.中太平洋结壳区海山燧石岩成因研究[J].海洋学报,2003,25(3):53-58. |
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| 作者姓名： | 陈建林 马维林 高水土 陶春辉 初凤友 武光海 |
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| 作者单位： | 1.国家海洋局, 海底科学重点实验室, 浙江, 杭州, 310012;国家海洋局, 第二海洋研究所, 浙江, 杭州, 310012 |
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| 基金项目： | 中国大洋协会“九五”专项基金(DY-95-08-06)，国家自然科学基金(49906004) |
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| 摘 要： | 燧石岩成因较为复杂,一般认为它主要是在深水环境中形成的.通过对燧石的宏观和微观特征、矿物和化学成分以及硅氧同位素组成特点,并结合区内地质构造背景等方面研究,认为中太平洋海山燧石岩是SiO2交代有孔虫灰岩之产物.其主要特征和分析结果是:燧石中具有已硅化了的白色斑块,在显微镜下可见其岩石薄片上的有孔虫化石.有些燧石标本的局部处仍残留着有孔虫灰岩小块体(经鉴定有孔虫属正常海相).燧石岩的矿物成分为较纯的低温石英,SiO2含量高达96%以上.具较高的δ18O值(0.032)和较低的δ30Si值(0.0004).区内断裂构造发育,出现多期火山喷发.海山形成地质时代大致在白垩纪—早第三纪,并经历了沉降过程.燧石形成于半深海环境,火山热液作用是SiO2来源的主要渠道.
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| 关 键 词： | 中太平洋 海山 钴结壳 燧石岩 成因 |
| 文章编号： | 0253-4193(2003)03-0053-07 |
| 收稿时间： | 2002/4/19 0:00:00 |
| 修稿时间： | 2002年4月19日 |
Genetic study on flint from the crust area of the central Pacific Ocean mountains |
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| CHEN Jian-lin,MA Wei-lin,GAO Shui-tu,TAO Chun-hui,CHU Feng-you and WU Guang-hai.Genetic study on flint from the crust area of the central Pacific Ocean mountains[J].Acta Oceanologica Sinica (in Chinese),2003,25(3):53-58. |
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| Authors: | CHEN Jian-lin MA Wei-lin GAO Shui-tu TAO Chun-hui CHU Feng-you and WU Guang-hai |
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| Affiliation: | 1.Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China2.Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | Origination of flints is rather complicated.The macro-feature and micro-texture of flints and their component characteristics of chemistry,minerals,and the silicon and oxygen isotope are studied.It is considered that the formation mechanism of flints from the central Pacific Ocean mountains is that foraminiferal limestone is substituted with the silica.The main characteristics of flints and analytic results are:there are white silicared stripes in flints.The same foraminiferal fossils can be found in the thin sections of flints.The remnants of foraminiferal limestone can be seen with the naked eyes in the part place of the same flints.The living environment of foraminifera is a normal marine(water depth 1000-3000 m).The composition of mineral is quartz,and the content of SiO2 is over 96% in flints,and it has rather high value of δ18O(0.032) and lower value of δ30SiO2(0.000 4).Two groups of faults of NW and EW directions suffered by volcanic eruption many times are main features of geological structure in this area.The geochron of these mountains is from Cretaceous period to early Tertiary period,and they underwent a subsidence process because of the"crustal movement.Flints are formed in the environment of semi-deep sea.Volcanogene hydrothermal activity might be main sources of silica. |
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| Keywords: | central Pacific Ocean mountain cobalt crust flint origination |
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