The geology and engineering geology of Pulau Pinang
Material type:
TextPublisher: Kuala Lumpur: Geological Survey of Malaysia, 1993Edition: Map Report 7Description: ill. 74p.(Included references and Index).- 25.2 cm.- Included Geological Map (Pulau Pinang.- New Series L 7010, Part of Sheet 28.- Scale 1 : 63,360)Subject(s): -- Geology -- Engineering -- Pulau PinangDDC classification: 555.9512 ONG Summary: Abstract.
The Pulau Pinang map area (topographic map sheet 28) includes the main island of Pulau Pinang, and the smaller islands of Pulau Jerejak, Pulau Rimau and Pulau Kendi in the viciniity, all within the state of Pulau Pinang (Penang Island).
Only Pulau Kendi is covered by sedimentary rocks which are predominantly argillaceous that show the effect of metamorphism. On the basis of structure and lithology these rocks may correlated with the Mahang Formation on the mainland.
The mainland of Pulau Pinang is underlain by two granite plutons, namely the North Pinang pluton and the South Pinang pluton. The biotite granite pluton with prdominant orthoclase and subordinate microcline occupies the hilly regions in the northern part of the main island as well as Pulau jerejak to the southeast. This pluton has been divided into three major units: the Tanjung Bunga granite, the Feringgi granite and the Muka Head microgranite. The biotite-muscovite granite pluton with predominant occupies the undulating southern part of the main island and also Pulau Rimau. Two subdivisions of the two-mica granite pluton have been recognised: the Batu Maung granite and the Sungai Ara granite. A fairly large area of the altered granite occurs at the contact between these two granite plutons.
Faulting and jointing are conspicuous in the map area. Five prominent trends of faulting and jointing have been recorded: some of these are now filled by quartz and aplite veins and dykes. most of the major faults show no apparent displacement except for the Sungai Air Putih-Sungai Dondang fault. However. granites along most of the major faults have undergone shearing to various degree.
Previously, no tin occurence had been recorded on the island: the present investigations have revealed the presence of cassiterite associated with the North Pinang pluton.
A relative slope stability map has been incorporated as an inset on the main geological map to assist with planning of engineering projects for the future development of the island. More detailed geologic and soil investigations are recommended, especially over areas where stability is not ascertained.
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Abstract.
The Pulau Pinang map area (topographic map sheet 28) includes the main island of Pulau Pinang, and the smaller islands of Pulau Jerejak, Pulau Rimau and Pulau Kendi in the viciniity, all within the state of Pulau Pinang (Penang Island).
Only Pulau Kendi is covered by sedimentary rocks which are predominantly argillaceous that show the effect of metamorphism. On the basis of structure and lithology these rocks may correlated with the Mahang Formation on the mainland.
The mainland of Pulau Pinang is underlain by two granite plutons, namely the North Pinang pluton and the South Pinang pluton. The biotite granite pluton with prdominant orthoclase and subordinate microcline occupies the hilly regions in the northern part of the main island as well as Pulau jerejak to the southeast. This pluton has been divided into three major units: the Tanjung Bunga granite, the Feringgi granite and the Muka Head microgranite. The biotite-muscovite granite pluton with predominant occupies the undulating southern part of the main island and also Pulau Rimau. Two subdivisions of the two-mica granite pluton have been recognised: the Batu Maung granite and the Sungai Ara granite. A fairly large area of the altered granite occurs at the contact between these two granite plutons.
Faulting and jointing are conspicuous in the map area. Five prominent trends of faulting and jointing have been recorded: some of these are now filled by quartz and aplite veins and dykes. most of the major faults show no apparent displacement except for the Sungai Air Putih-Sungai Dondang fault. However. granites along most of the major faults have undergone shearing to various degree.
Previously, no tin occurence had been recorded on the island: the present investigations have revealed the presence of cassiterite associated with the North Pinang pluton.
A relative slope stability map has been incorporated as an inset on the main geological map to assist with planning of engineering projects for the future development of the island. More detailed geologic and soil investigations are recommended, especially over areas where stability is not ascertained.
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