Evidence for off-ridge thermal interaction along the Carlsberg and Central Indian ridges and its tectonic significance

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
K. S. Sreenidhi, K. M. Sreejith, M. Radhakrishna
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Abstract

Seafloor spreading along the Carlsberg and Central Indian ridges has steered the tectonic evolution of the western Indian Ocean. These spreading ridges display variations in spreading rate, segmentation, and morphological characteristics, providing clues to the long-term evolution of the oceanic lithosphere in this region. To assess the influence of two notable off-axis thermal sources, the Réunion plume and the Indian Ocean Diffuse Boundary Zone, on factors such as rigidity and seafloor subsidence along these ridges, we computed the effective elastic thickness (Te), residual geoid-age slopes, and residual depth anomalies (RDA) of the region using gravity and geoid data. The results reveal a weaker lithosphere at the northern Central Indian Ridge (Te: ~ 8.5–8.9 km) compared to the neighboring segments of the southern Central Indian Ridge (Te: ~ 10.5–12.7 km) and the Carlsberg Ridge (Te: ~ 10.5–14.7 km). Residual geoid and RDA variations suggest asymmetric seafloor spreading and subsidence along the entire ridge system. The asymmetric subsidence across the Central Indian Ridge is largely due to upper mantle contamination from the Réunion plume, while across the Carlsberg Ridge, it may be linked to its complex tectonic history. The rigidity and seafloor spreading patterns along the northern Central Indian Ridge are notably affected by thermal perturbations from the regional heat flow anomaly of the ongoing diffuse deformation zone. Moreover, the Te and segmentation patterns roughly correlate along the ridge system, suggesting a causal relationship between the two or the presence of underlying factors such as regional thermal structure influencing both.

Abstract Image

卡尔斯伯格海脊和印度中部海脊沿线海脊外热相互作用的证据及其构造意义
沿着卡尔斯伯格海脊和中印度洋脊的海底扩张引导了西印度洋的构造演化。这些扩张海脊在扩张速度、分段和形态特征方面显示出差异,为该地区海洋岩石圈的长期演化提供了线索。为了评估留尼汪羽流和印度洋扩散边界区这两个显著的离轴热源对这些海脊的刚性和海底沉降等因素的影响,我们利用重力和大地水准面数据计算了该地区的有效弹性厚度(Te)、残余大地水准面-年龄斜率和残余深度异常(RDA)。结果显示,与邻近的印度洋中脊南部(Te:约 10.5-12.7 km)和卡尔斯伯格海脊(Te:约 10.5-14.7 km)相比,印度洋中脊北部(Te:约 8.5-8.9 km)的岩石圈较薄弱。残余大地水准面和 RDA 变化表明,整个海脊系统的海底扩张和下沉是不对称的。印度洋中部海脊的非对称沉降主要是由于留尼汪羽流造成的上地幔污染,而卡尔斯伯格海脊的非对称沉降则可能与其复杂的构造历史有关。中印度洋脊北部的刚性和海底扩张模式明显受到正在发生的弥漫变形区的区域热流异常的热扰动影响。此外,海脊系统沿线的 Te 和分段模式大致相关,这表明两者之间存在因果关系,或存在影响两者的区域热结构等潜在因素。
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来源期刊
Marine Geophysical Research
Marine Geophysical Research 地学-地球化学与地球物理
CiteScore
2.80
自引率
14.30%
发文量
41
审稿时长
>12 weeks
期刊介绍: Well-established international journal presenting marine geophysical experiments on the geology of continental margins, deep ocean basins and the global mid-ocean ridge system. The journal publishes the state-of-the-art in marine geophysical research including innovative geophysical data analysis, new deep sea floor imaging techniques and tools for measuring rock and sediment properties. Marine Geophysical Research reaches a large and growing community of readers worldwide. Rooted on early international interests in researching the global mid-ocean ridge system, its focus has expanded to include studies of continental margin tectonics, sediment deposition processes and resulting geohazards as well as their structure and stratigraphic record. The editors of MGR predict a rising rate of advances and development in this sphere in coming years, reflecting the diversity and complexity of marine geological processes.
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