| 海洋地壳辉长岩层中晶体颗粒大小随深度分布的初步探讨 |
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| 引用本文： | 张志刚,陈永顺.海洋地壳辉长岩层中晶体颗粒大小随深度分布的初步探讨[J].地球物理学报,2004,47(4):610-615. |
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| 作者姓名： | 张志刚 陈永顺 |
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| 作者单位： | 北京大学地球物理系,计算地球动力学重点实验室,北京,100871;北京大学地球物理系,计算地球动力学重点实验室,北京,100871 |
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| 基金项目： | 国家自然科学基金杰出青年基金项目 ( 4 0 12 5 0 11) |
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| 摘 要： | 通过海洋地壳生成模型得到的典型快速扩张的太平洋中脊处海洋地壳内的热结构和速度场，推算出海洋地壳内的辉长岩层上、下组的成岩时间存在大于一个数量级的差异(成岩时间是指岩浆降温到某一指定温度时所经历的时间). 并试图用这个结果来解释在Oman蛇绿岩套辉长岩层野外实际观测得到的结论：海洋岩石圈底部的辉长岩的结晶颗粒大小的平均值要比浅部辉长岩结晶颗粒大小的平均值高出一个数量级.
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| 关 键 词： | 蛇绿岩套 成岩时间 大洋中脊动力学 海洋地壳生成机制 海洋辉长岩层结构 海洋地壳岩浆房 |
| 文章编号： | 0001-5733(2004)04-0610-06 |
| 收稿时间： | 2003-6-27 |
| 修稿时间： | 2004-2-29 |
A preliminary study of depth distribution of crystal sizes within the gabbro layer of the oceanic crust |
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| ZHANG Zhi-Gang,CHEN Yong-Shun Computational Geodynamics Laboratory.A preliminary study of depth distribution of crystal sizes within the gabbro layer of the oceanic crust[J].Chinese Journal of Geophysics,2004,47(4):610-615. |
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| Authors: | ZHANG Zhi-Gang CHEN Yong-Shun Computational Geodynamics Laboratory |
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| Institution: | Computational Geodynamics Laboratory, Department of Geophysics, Peking University, Beijing 100871, China |
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| Abstract: | The present crustal accretion model at a fast spreading ridge predicts at least an order of magnitude difference on average in the crystallization time, the time for a crystal to cool itself to a given temperature, between the upper gabbros and lower gabbros. As a consequence, lower gabbros of the oceanic crust could have a larger crystal grain size on average than that of the upper gabbros as seen from the filed observations at the Oman ophiolite. |
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| Keywords: | Ophiolite Crystallization time Mid-ocean ridge dynamics Accretion mechanism of oceanic crust Structure of the gabbros Magma chamber at mid-ocean ridges |
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