Surface microtextures of quartz grains from the central coast of Tamil Nadu |
| |
Authors: | P Udayaganesan N Angusamy A R Gujar G V Rajamanickam |
| |
Institution: | 1.Alagappa Government Arts College,Karaikudi,India;2.Fortesque Metals Group,Perth,Australia;3.National Institute of Oceanography (Council of Scientific and Industrial Research),Dona Paula,India;4.Sri Sairam Group of Institutions,Chennai,India |
| |
Abstract: | Quartz grain surface micro textures of 12 samples collected from the beach were examined under scanning electron microscopy
to understand the role of coastal processes on their transportation and deposition. The study area has been divided into three
sectors on the basis of drainage, geomorphology and nature of the beach and shelf topography. Surface textures of the northern
sector display an array of mechanical features like conchoidal fracture, V marks and impact pits, indicating the dominance
of mechanical processes. However, silica precipitation in the form of globules indicates an added influence of chemical processes
in the Northern sector. The presence of chemical features in northern sector, where energy level is high, corroborates the
addition of quartz grains from paleo-sediments, from the nearby Tertiary and Cretaceous formations. Central sector quartz
grains display the signatures of chemical and mechanical processes. The presence of step like furrows in southern sector is
an indicator of fluvial low energy conditions, and supplements the role of littoral currents in depositing the quartz grains
along the coastal region. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|