Sea stack landform8/31/2023 ![]() ![]() It is about 32km east of Port Blair and lies in the southern-most part of the Archipelago between Havelock Island in the north and Sir Hugh Rose Island in the south. The island is part of Ritchie’s Archipelago of South Andaman division, situated in the Andaman Sea (Figure 1). This study identifies and describes various aspects of the Neogene coastal landforms determined during field trips and stratigraphic investigations.įigure 1: (a) Location of Neil Island, (b) Location of various coastal landforms PHYSICAL SETTING The evolution and subsequent changes of coastal landforms were influenced by various factors like tectonics, coastal, and weathering processes (Bird, 2007). A coastline of 19.3km length, shows a complex nature, and exhibits a wide range of erosional landforms in the western part. Most of the coastal landforms of this group had been carved out during Holocene time. Chalk and limestone are the major rocks in the Archipelago group. Neil Island, a part of Ritchie’s Archipelago Group ranges in age from Early Miocene to Pleistocene. This gave rise to an inner sedimentary arc. Another major event recorded during this time was the upliftment of deep water marine sediments in the fore arc basin of Andaman Nicobar accretionary prism (Sharma & Srinivas, 2007). During this period there had been major changes in the tectonics, physiographic, faunal and past sea level history, which had influenced the geomorphic and sedimentation processes in the coastal regions. Neogene period had been one of the most crucial times in earth’s history (Sharma & Srinivas, 2007). Mots clés: Néogène, arche marine, caye, formes littorales, Inde La formation de la caye résulte de l’accumulation de sable coquiller. L’étude révèle que des facteurs comme les processus marins ainsi que des processus de dissolution ont joué un rôle important dans l’évolution des reliefs et l’érosion littorale. L’activité érosive concerne surtout la partie ouest de l’île alors que la caye se trouve dans la partie nord de l’île. Les principaux reliefs côtiers identifiés dans la zone d’étude sont: la falaise, le platier, les encoches, la grotte, l’arche marine, l’éperon d’érosion marine, la plage et la formation sablo-argileuse. Des sorties sur le terrain, l’analyse des images satellites et des cartes SDI ont facilité l’analyse géomorphologique du littoral de l’île de Neil. ![]() ![]() Résumé : Le littoral de l’île de Neil, une partie de l’archipel de Ritchie du groupe Andaman et de Nicobar, présente une variété de reliefs côtiers et des environnements sédimentaires. Keywords: Neogene, Arch, Cay, Coastal landforms, India The cay formation is mainly due to the result of sediment accumulation. The study reveals that factors like marine processes along with solution process have played significant role in the evolution of erosional landforms. ![]() The erosional features are mostly concentrated in the western part of the island whereas the sandy cay is found in the northern part of the island. The major coastal landforms identified in the study area are: cliff, wave-cut platform, sea notch, sea cave, sea arch, sea stack, beach, and sandy cay formation. Field trip studies conducted and analysis of satellite images and SDI maps complimented this endeavor. Inventaire des formes littorales du Néogène, la côte de l’île Neil, Sud Andaman, IndeĪbstract: The Coast of Neil Island, a part of Ritchie’s Archipelago of Andaman and Nicobar group of islands, exhibits varied coastal landforms and sedimentary environments. ![]()
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