Tectonic uplifts based on morphometric indices in North West Sabah, Malaysia

The study constitutes the identification of uplift sites based on gradient and erosion anomalies over four major catchments in northwest Sabah, namely Kota Belud, Tuaran, Kinabalu Northeast, and Kinabalu Southeast catchments. The objectives of the study are to identify and screen regional sites of t...

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Main Author:	Chung, Wei Kiat
Format:	Thesis
Language:	English English
Published:	2020
Subjects:	QE1-996.5 Geology
Online Access:	https://eprints.ums.edu.my/id/eprint/41233/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/41233/2/FULLTEXT.pdf
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id	my-ums-ep.41233
record_format	uketd_dc
spelling	my-ums-ep.412332024-10-18T07:15:19Z Tectonic uplifts based on morphometric indices in North West Sabah, Malaysia 2020 Chung, Wei Kiat QE1-996.5 Geology The study constitutes the identification of uplift sites based on gradient and erosion anomalies over four major catchments in northwest Sabah, namely Kota Belud, Tuaran, Kinabalu Northeast, and Kinabalu Southeast catchments. The objectives of the study are to identify and screen regional sites of tectonic uplifts; identify and characterize sites of local uplift; validate the tectonic uplift in the field; and infer the active tectonics of northwest Sabah. The sites of tectonic uplifts at a regional and local scale were identified using gradient and erosion metrics over the 30 m resolution SRTM digital elevation models (DEM) and 5 m resolution IFSAR digital elevation models (DTM & DSM), respectively. The gradient metrics includes stream-length gradient index, surface-shape length gradient index, and knickpoint identifications whereas the erosion metrics includes normalized channel steepness index, chi-factor analysis and minimum bulk erosion. Based on the morphometric indices, several sites located both in the western and eastern flank catchments showed significant anomalies interpreted to be uplifted sites due to faults or lithological differences. Some of the anomalies are aligned N40E and may indicate alignment of regional faults. A closer analysis of some of the most significant anomalies in 18 sites clearly showed the presence of uplifted landforms. Out of 18 uplifted sites validated and characterized in the field, 11 sites from the western flank catchments indicates a NW-SE extensional regime, where the landform appears to be stretched forming a series of rapids and small waterfalls, whereas 7 sites from the eastern flank catchments indicates a NWSE compressional regime, where the landform appears to have buckled causing stream ponding and incised valleys. The presence of both compressional and extensional tectonic regimes in northwest Sabah may be associated with NW-SE intraplate compression and gravity sliding towards the South China Sea. 2020 Thesis https://eprints.ums.edu.my/id/eprint/41233/ https://eprints.ums.edu.my/id/eprint/41233/1/24%20PAGES.pdf text en public https://eprints.ums.edu.my/id/eprint/41233/2/FULLTEXT.pdf text en validuser dphil doctoral Universiti Malaysia Sabah Faculty Of Science And Natural Resources
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
language	English English
topic	QE1-996.5 Geology
spellingShingle	QE1-996.5 Geology Chung, Wei Kiat Tectonic uplifts based on morphometric indices in North West Sabah, Malaysia
description	The study constitutes the identification of uplift sites based on gradient and erosion anomalies over four major catchments in northwest Sabah, namely Kota Belud, Tuaran, Kinabalu Northeast, and Kinabalu Southeast catchments. The objectives of the study are to identify and screen regional sites of tectonic uplifts; identify and characterize sites of local uplift; validate the tectonic uplift in the field; and infer the active tectonics of northwest Sabah. The sites of tectonic uplifts at a regional and local scale were identified using gradient and erosion metrics over the 30 m resolution SRTM digital elevation models (DEM) and 5 m resolution IFSAR digital elevation models (DTM & DSM), respectively. The gradient metrics includes stream-length gradient index, surface-shape length gradient index, and knickpoint identifications whereas the erosion metrics includes normalized channel steepness index, chi-factor analysis and minimum bulk erosion. Based on the morphometric indices, several sites located both in the western and eastern flank catchments showed significant anomalies interpreted to be uplifted sites due to faults or lithological differences. Some of the anomalies are aligned N40E and may indicate alignment of regional faults. A closer analysis of some of the most significant anomalies in 18 sites clearly showed the presence of uplifted landforms. Out of 18 uplifted sites validated and characterized in the field, 11 sites from the western flank catchments indicates a NW-SE extensional regime, where the landform appears to be stretched forming a series of rapids and small waterfalls, whereas 7 sites from the eastern flank catchments indicates a NWSE compressional regime, where the landform appears to have buckled causing stream ponding and incised valleys. The presence of both compressional and extensional tectonic regimes in northwest Sabah may be associated with NW-SE intraplate compression and gravity sliding towards the South China Sea.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Chung, Wei Kiat
author_facet	Chung, Wei Kiat
author_sort	Chung, Wei Kiat
title	Tectonic uplifts based on morphometric indices in North West Sabah, Malaysia
title_short	Tectonic uplifts based on morphometric indices in North West Sabah, Malaysia
title_full	Tectonic uplifts based on morphometric indices in North West Sabah, Malaysia
title_fullStr	Tectonic uplifts based on morphometric indices in North West Sabah, Malaysia
title_full_unstemmed	Tectonic uplifts based on morphometric indices in North West Sabah, Malaysia
title_sort	tectonic uplifts based on morphometric indices in north west sabah, malaysia
granting_institution	Universiti Malaysia Sabah
granting_department	Faculty Of Science And Natural Resources
publishDate	2020
url	https://eprints.ums.edu.my/id/eprint/41233/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/41233/2/FULLTEXT.pdf
_version_	1818611384008572928

Tectonic uplifts based on morphometric indices in North West Sabah, Malaysia

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