Mid-Holocene sedimentation and landscape evolution in the western Great Rann of Kachchh, India

详细信息	查看全文 | 推荐本文 |

• 作者：A.K. Tyagi^a ; ^b ; A.D. Shukla^a ; R. Bhushan^a ; P.S. Thakker^c ; M.G. Thakkar^d ; N. Juyal^a ; ^{navin@prl.res.in}
• 关键词：Great Rann ; Mid-Holocene ; Tidal flat ; Sea level ; Optical and radiocarbon dating
• 刊名：Geomorphology
• 出版年：2012
• 期刊代码：31_0169555x
• 类别：soc
• 出版时间：15 May, 2012
• 卷：151-152
• 期：Complete
• 页码：89-98
• 文件大小：1849 K

摘要

This study is an attempt to reconstruct the history of sedimentation and landform evolution in the western Great Rann of Kachchh. Field stratigraphy, sedimentology, geochemistry, optical and radiocarbon dating suggest dominance of tidal flat sedimentation with subordinate contribution coming from the southern-draining streams during 5.5 to 2 ka. Variability in the geochemical proxies are interpreted as a surrogate for tidal energy (viz. Zr and Cr) which, along with the major elemental ratios (TiO₂/Al₂O₃ and K₂O/Al₂O₃), indicate enhanced tidal energy condition during 5.5 to 5 ka and around 3 ka. A close correspondence of the major and trace elements with those of the Indus River sediment and the dominance of illite suggest the Indus River was a major contributor for western Rann sedimentation during the mid-Holocene. These sediments were routed through the Kori Creek during marginally high sea level until around 2.2 ka and the present landscape was largely sculptured after the 1819 Allah Bund earthquake.