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

doi:10.3969/j.issn.1001-909X.2016.01.002

海洋学研究 ›› 2016, Vol. 34 ›› Issue (1): 8-17.DOI: 10.3969/j.issn.1001-909X.2016.01.002

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

纪飞^1,2, 高金耀^1,2, 张涛^1,2, 杨春国^1,2, 丁维凤^1,2

1.国家海洋局第二海洋研究所,浙江杭州 310012;
2.国家海洋局海底科学重点实验室,浙江杭州 310012

收稿日期:2015-05-04 修回日期:2015-06-16 出版日期:2016-03-15 发布日期:2022-11-24
作者简介:纪飞(1988-),男,河北石家庄市人,主要从事海洋地球物理与岩石圈动力学研究。E-mail:feijichn@yahoo.com
基金资助:
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)

Effective elastic thickness of Ninetyeast Ridge and its implication for tectonic evolution

JI Fei^1,2, GAO Jin-yao^1,2, ZHANG Tao^1,2, YANG Chun-guo^1,2, DING Wei-feng^1,2

1. The Second Institute of Oceanography, SOA, Hangzhou, 310012, China ;
2. Key Laboratory of Submarine Geosciences, SOA, Hangzhou, 310012, China

Received:2015-05-04 Revised:2015-06-16 Online:2016-03-15 Published:2022-11-24

摘要/Abstract

摘要： 有效弹性厚度(T_e)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T_e的角度出发,通过空间褶积方法计算了沿着NER不同位置处T_e的空间分布特征。计算结果表明,整个海岭的T_e主要在0~35 km之间变化,表现为北(8°N~1°N)高(平均值为20 km)、中(1°N~15°S)低(平均值在5 km以下)、南(15°S~30°S)高(平均值为30 km),变化趋势与凯尔盖朗热点的3期岩浆活动相对应。T_e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T_e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。

关键词: 褶积算法, 有效弹性厚度, 东经九十度海岭, 构造演化

Abstract: The effective elastic thickness(T_e) which depends on the deep lithospheric temperature structure and crustal compositions, represents the lithospheric ability to resist deformation. The Ninetyeast Ridge(NER), one of the longest seamount in the world, has been studied by many researchers over its original and process. However, the complicated tectonic activities cause that it is too difficult to uncover the evolution of the NER. Here we investigated the NER in terms of T_e with convolution method and obtained its spatial variations of T_e. The results show that values vary from 0 to 35 km. T_e is characterized as high value (averaging 20 km) in the north section (8°N~1°N), low value (averaging less than 5 km) in the middle part (1°N~15°S) and high value (averaging 30 km) in the south section (15°S~30°S), which are associated with three stages of volcanic activities of Kerguelen hotspot. In addition, the variations of values reflect the adjustment of relative position between Southeast Indian Ridge and hot spot during the evolution of NER and further prove that the NER is influenced and controlled by the Kerguelen hotspot, Indian plate's drift and Southeast Indian Ridge's jump. Finally, by combining with the evidence of ROYER's plate reconstruction, a model was proposed to show the evolution of Ninetyeast Ridge.

Key words: convolution method, effective elastic thickness, Ninetyeast Ridge, tectonic evolution

中图分类号:

P313

纪飞, 高金耀, 张涛, 杨春国, 丁维凤. 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[J]. 海洋学研究, 2016, 34(1): 8-17.

JI Fei, GAO Jin-yao, ZHANG Tao, YANG Chun-guo, DING Wei-feng. Effective elastic thickness of Ninetyeast Ridge and its implication for tectonic evolution[J]. Journal of Marine Sciences, 2016, 34(1): 8-17.

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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

Effective elastic thickness of Ninetyeast Ridge and its implication for tectonic evolution

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