The geology and mineral resources of the Northern Usun Apau Area, Sarawak, Malaysia.
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TextPublisher: Kuala Lumpur: Jabatan Mineral Dan Geosains Malaysia, 2009Edition: Map Report 21Description: ill. 135p.- 29.8 cm.- Included Geological Map of the Northern Usun Apau Area (Sheet 1) & (Sheet 2), Geological Cross Section and Stratigraphic Correlation (Sheet 1A) and (Sheet 2A) .- Scale 50 000ISBN: 978-983-44396-4-4Subject(s): -- Geology -- Malaysia -- Usun Apau Area, Sarawak | -- Mineral Resources -- Malaysia -- Usun Apau Area, SarawakSummary: Abstract
This report describes the geology and mineral resources of the Northern Usun Apau plateau area, located in the upper Sungai Baram basin in the eastern part of central Sarawak. The area is about 1553 km, and is covered by parts of Sarawak Quarter Degree Sheets 3/114/14 (Belaga-Lobang), 3/114/15 (Bukit Kalulong), 3/114/16 (Long Anap), 2/114/2 (Sungai Seping), 2/114/3 (Usun Apau Plateau) and 2/114/4 (Sungai Silat).
The area is underlain by 4 rock stratigraphic units namely; Julan Formation, Pelagus Member of the Belaga Formation, Setap Shale and the Usun Apau Volcanics. The Julan Formation, Pelagus Member and the Setap Shale are the folded sedimentary formation; forming rigdes aligned generally in E-W direction. Overlying these sedimentary formations is the volcanic rock formation namely Usun Apau Volcanic. This volcanic rock forms the Usun Apau with an average elevation of 1000m above sea level.
The Julan Formation is the oldest unit, about 1200m thick, deposited during Paleocene to early Eocene in a deep marine environment. This unit is made up of slumping deposits of sandstone and shale with gabro and basalt blocks embedded in the dark brown matrix. The Pelagus Member of the Belaga Formation is made up of sandstone interbedded with shale, and is about 2,000m thick. This was unit deposited during early Eocene to Late Eocene, in marine environment.
The younger Setap Shale unit is made up mainly of shale and some limestone deposited during Oligocene. The shale in this formation is mainly black with a flaky texture. The Usun Apau Volcanics is made up of dacitic tuff and a little amount of agglomerate. It is the youngest strarigraphic unit in the study area. This dacitic rock consists of two varieties of tuff, namely vitric and lithic tuff. Most part of the Usun Apau Plateau is underlain by the vitric tuff. The age of Usun Apau Volcanics is Late Miocene, and the rock was formed as the result of the volcanic eruption during Late Miocene.
Geochemical survey by means of collecting stream sediments and panned concentrateswas conducted during the geological mapping of the area. A total 527 streams and 51 panned concentrates samples were collected during the survey. Stream sediment samples were analysed for 14 elements. The results of the metal contents in the stream sediments showns that high values of gold were detected in Ulu Sungai Dapoi (0.82 ppm), Ulu Sungai Burau (1.7 ppm) and Ulu Sungai Lobang (0.53 ppm), thus it warrants futher follow-up work.
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Abstract
This report describes the geology and mineral resources of the Northern Usun Apau plateau area, located in the upper Sungai Baram basin in the eastern part of central Sarawak. The area is about 1553 km, and is covered by parts of Sarawak Quarter Degree Sheets 3/114/14 (Belaga-Lobang), 3/114/15 (Bukit Kalulong), 3/114/16 (Long Anap), 2/114/2 (Sungai Seping), 2/114/3 (Usun Apau Plateau) and 2/114/4 (Sungai Silat).
The area is underlain by 4 rock stratigraphic units namely; Julan Formation, Pelagus Member of the Belaga Formation, Setap Shale and the Usun Apau Volcanics. The Julan Formation, Pelagus Member and the Setap Shale are the folded sedimentary formation; forming rigdes aligned generally in E-W direction. Overlying these sedimentary formations is the volcanic rock formation namely Usun Apau Volcanic. This volcanic rock forms the Usun Apau with an average elevation of 1000m above sea level.
The Julan Formation is the oldest unit, about 1200m thick, deposited during Paleocene to early Eocene in a deep marine environment. This unit is made up of slumping deposits of sandstone and shale with gabro and basalt blocks embedded in the dark brown matrix. The Pelagus Member of the Belaga Formation is made up of sandstone interbedded with shale, and is about 2,000m thick. This was unit deposited during early Eocene to Late Eocene, in marine environment.
The younger Setap Shale unit is made up mainly of shale and some limestone deposited during Oligocene. The shale in this formation is mainly black with a flaky texture. The Usun Apau Volcanics is made up of dacitic tuff and a little amount of agglomerate. It is the youngest strarigraphic unit in the study area. This dacitic rock consists of two varieties of tuff, namely vitric and lithic tuff. Most part of the Usun Apau Plateau is underlain by the vitric tuff. The age of Usun Apau Volcanics is Late Miocene, and the rock was formed as the result of the volcanic eruption during Late Miocene.
Geochemical survey by means of collecting stream sediments and panned concentrateswas conducted during the geological mapping of the area. A total 527 streams and 51 panned concentrates samples were collected during the survey. Stream sediment samples were analysed for 14 elements. The results of the metal contents in the stream sediments showns that high values of gold were detected in Ulu Sungai Dapoi (0.82 ppm), Ulu Sungai Burau (1.7 ppm) and Ulu Sungai Lobang (0.53 ppm), thus it warrants futher follow-up work.
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