东经九十度海岭有效弹性厚度计算及其对构造运动的解释

发布时间：2018-06-02 23:28

本文选题：褶积算法 + 有效弹性厚度　；参考：《海洋学研究》2016年01期

【摘要】：有效弹性厚度(Te)表示岩石圈抵抗变形的能力,其大小主要取决于岩石圈内部的温度结构和地壳物质组成。作为全球最长的海岭之一,东经九十度海岭(NER)来源与形成过程一直是国内外科学家研究的热点,然而受到该地区复杂构造活动的影响,研究者对海岭的形成过程仍缺乏清晰认识。本文从Te的角度出发,通过空间褶积方法计算了沿着NER不同位置处Te的空间分布特征。计算结果表明,整个海岭的Te主要在0~35km之间变化,表现为北(8°N~1°N)高(平均值为20km)、中(1°N~15°S)低(平均值在5km以下)、南(15°S~30°S)高(平均值为30km),变化趋势与凯尔盖朗热点的3期岩浆活动相对应。Te的变化反映了NER形成过程中东南印度洋脊与热点的相对位置的调整,说明NER是凯尔盖朗热点、印度洋板块扩张与东南印度洋洋中脊迁移三者共同作用的结果。最后,结合Te的结果与ROYER板块重构的结果,本文提出了NER形成过程的模式。
[Abstract]:The effective elastic thickness (Tee) represents the ability of the lithosphere to resist deformation, the magnitude of which mainly depends on the temperature structure of the lithosphere and the composition of the crustal material. As one of the longest sea ridges in the world, the origin and formation process of NERs at 90 degrees East has been a hot research topic for scientists at home and abroad. However, it is influenced by the complex tectonic activities in this area. The researchers still lack a clear understanding of the formation of the ridge. From the point of view of Te, the spatial distribution characteristics of Te along different positions of NER are calculated by spatial convolution method. The calculated results show that the Te of the whole ridge mainly varies between 0~35km, The average height is 8 掳Nu 1 掳N (mean 20 km / m, middle 1 掳N 15 掳S), and the average is below 5km and the south is 15 掳S ~ 30 掳S) high (mean 30 km / m ~ (-1). The trend of change is corresponding to the change of NER in the third stage of magmatic activity in Kelgeelang hot spot, which reflects the middle and southeast India during the formation of NER. The adjustment of the relative position of the degree ridge to the hot spot, It is suggested that NER is the hot spot of Kelgeelang and the interaction of Indian plate spreading and the mid-Indian ridge migration in the southeast of India is the result of the interaction. Finally, based on the results of Te and ROYER plate reconstruction, a model of NER formation process is proposed in this paper.
【作者单位】：国家海洋局第二海洋研究所;国家海洋局海底科学重点实验室;
【基金】：南北极环境综合考察与评估专项项目资助(CHINARE2015-01-03,CHINARE2015-04-01,CHINARE2015-03-03,CHINARE2015-03-04)
【分类号】：P736.1

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