印度西南大陆边缘白垩纪-古新世时期的延伸和拉卡迪夫盆地的开辟:地球物理数据的制约因素

IF 3.2 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Solid Earth Pub Date : 2024-06-18 DOI:10.5194/se-15-671-2024
Mathews George Gilbert, Parakkal Unnikrishnan, Munukutla Radhakrishna
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引用次数: 0

摘要

摘要此前对印度西部大陆边缘(WCMI)的地球物理调查证实,该大陆边缘的断裂历史分为两个阶段,第一次断裂发生在印度和马达加斯加之间,在晚白垩世形成了马斯卡林海盆,第二次断裂发生在早古新世,塞舌尔群岛从印度分离。尽管对西西伯利亚大陆边缘进行了大量地球科学研究,但位于边缘南部的拉卡迪夫海盆的开口仍未得到很好的解释。在这项研究中,我们对边缘的多道地震反射和重力异常进行了评估,结合马斯卡林海盆的磁异常识别,确定了早期裂谷的特征。通过分析,确定了两种延伸构造趋势,一种是泰利切里拱以北拉卡迪夫海脊上的 NNW-SSE 向构造,解释为 ENE-WSW 向延伸的结果;另一种是拉卡迪夫盆地区域向南的 SSW-NNE 向构造,解释为 NW-SE 向延伸的结果。之前利用海洋磁力线建立的马斯卡林海盆板块重建模型表明,在拉卡迪夫海脊观测到的 ENE-WSW 延伸可能与印度-马达加斯加分离有关。我们将沉积物沉积模式和古新世陷落火山岩的存在与在拉卡迪夫海盆地区观察到的西北-东南地堑联系起来,认为这与马达加斯加从印度分离后拉卡迪夫海脊和印度西海岸之间的延伸有关。我们进一步提出,印度的逆时针旋转和留尼汪羽流的通过促进了拉卡迪夫海盆的打开。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cretaceous–Paleocene extension at the southwestern continental margin of India and opening of the Laccadive basin: constraints from geophysical data
Abstract. Previous geophysical investigations of the western continental margin of India (WCMI) confirm the two-phase breakup history of the margin with the first breakup taking place between India and Madagascar that created the Mascarene Basin in the Late Cretaceous and the second breakup event in Early Paleocene with Seychelles separating from India. Despite numerous geoscientific studies along the WCMI, the opening of the Laccadive basin, situated along the southern part of the margin, remains poorly constrained. In this study, we evaluate the multi-channel seismic reflection and gravity anomalies at the margin to identify the early rift signatures in conjunction with the magnetic anomaly identifications in the Mascarene Basin. The analysis led to the identification of two trends of extensional structures, a NNW–SSE-oriented structure over the Laccadive Ridge north of Tellicherry Arch, interpreted to result from ENE–WSW extension, and a SSW–NNE-oriented structure in the Laccadive basin region towards the south, interpreted to result from NW–SE extension. Previous plate reconstruction models of the Mascarene Basin using marine magnetic lineations suggest that the ENE–WSW extension observed over the Laccadive Ridge could be related to the India–Madagascar separation. We associate the pattern of sediment deposition and the presence of a Paleocene trap volcanics, linked with the NW–SE grabens observed in the Laccadive basin region, to the extension between the Laccadive Ridge and the western coast of India after the separation of Madagascar from India. We further propose that the anticlockwise rotation of India and the passage of the Réunion plume have facilitated the opening of the Laccadive basin.
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来源期刊
Solid Earth
Solid Earth GEOCHEMISTRY & GEOPHYSICS-
CiteScore
6.90
自引率
8.80%
发文量
78
审稿时长
4.5 months
期刊介绍: Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.
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