Chronology of red dune aggradations of South India and its Palaeo-environmental significance

Geochronometria

Palaniandy Seralathan¹  Ashok Kumar Singhvi²  Anil D. Shukla²  Linto Alappat²  Kyth Pillai Thrivikramji³ 

[1] Cochin University of Science and Technology;Physical Research Laboratory;University of Kerala

关键词: red sand dunes;    OSL dating;    Pleistocene;    Holocene;    chronology;    sand aggradations;   

DOI  :  10.2478/s13386-013-0118-5

学科分类：社会科学、人文和艺术（综合）

来源: Politechnika Slaska * Instytut Fizyki

【 摘 要 】

Red sand dunes occur in the coastal plains of south east and west of Tamil Nadu, India between the coordinates of 8°00′ to 9°30′ N; 77°18′ to 79° 00′ E. OSL dating of these sands indicated aggradations between ∼16-9 ka and ∼9-3 ka in the west and east coasts respectively. Dating results from inland red dunes at the foothills of Western Ghats show a break in deposition at ∼6 ka and aggradation since ∼2 ka. The sand aggradations in the west coast occurred during the transition period when SW monsoon in the area was reestablishing. The dunes attained their stability by 9 ka. In the coastal region, the aggradations were controlled by sea level changes and a local recycling of earlier dunes (in the east coast). In the inland areas, the dune building was controlled by sand supply from fluvial sources.

【 授权许可】

Unknown