แร่หนักในตะกอนสึนามิ ปี พ.ศ. 2547 : การแปลผลรูปแบบ และทิศทางการเคลื่อนที่ เกาะพระทอง จังหวัดพังงา
Heavy minerals in tsunami deposits may help in identifying mode of transportation of sediments (bedload or suspension load) and identifying flow direction (inflow or outflow), correctly identify bedload and suspension load thickness deposited from each event is important in calculating tsunami flow...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Senior Project |
| Language: | Thai |
| Published: |
จุฬาลงกรณ์มหาวิทยาลัย
2015
|
| Subjects: | |
| Online Access: | https://digiverse.chula.ac.th/Info/item/dc:9873 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Chulalongkorn University |
| Language: | Thai |
| Summary: | Heavy minerals in tsunami deposits may help in identifying mode of transportation of sediments (bedload or suspension load) and identifying flow direction (inflow or outflow), correctly identify bedload and suspension load thickness deposited from each event is important in calculating tsunami flow speed. In this study, quantify amount and identify types of heavy minerals found in bedload and suspension load sediments of 2004 tsunami deposits from Phra Thong Island, Changwat Phang Nga. We collected a total of 30 samples of 2004 tsunami from 17 locations along the transect, containing 11 suspension deposits samples, 14 bedload deposits samples and 5 bulk samples. The samples were analyzed for grain size distribution and X-Ray Diffractometer (XRD; using Powder XRD). The results show that bedload deposits have a greater heavy minerals content than suspension deposits and bedload deposit from the outflow. Schorl, rutile, anatase, ilmenite, magnesite, and muscovite are found in both of bedload and suspension deposits but ilmenite was not found in the bedload deposit of the outflow. Bedload deposits have more schorl and anatase but less muscovite than suspension deposits and the bedload deposit of the outflow. In field observation, it is not possible to distinguish bedload from suspension load based on their small difference in heavy minerals content (0.5-1%) and in amounts of muscovite. Thus heavy minerals assemblages and contents alone cannot effectively be used in identifying mode of transportation of 2004 tsunami deposits and flow direction at Phra Thong Island. |
|---|