Petrology and geochemical features of Semporna volcanic rocks, South-East Sabah, Malaysia
The volcanic rocks in Semporna Peninsula, Sabah, Malaysia forms parts of the Miocene subjected slab during the Miocene-Pliocene orogeny. This study presents new petrographic and geochemical data of volcanic rocks in Semporna area. The volcanic rocks range in composition from basaltic andesite, a...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Penerbit Universiti Kebangsaan Malaysia
2021
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| Online Access: | http://journalarticle.ukm.my/16387/1/2.pdf http://journalarticle.ukm.my/16387/ https://www.ukm.my/jsm/malay_journals/jilid50bil1_2021/KandunganJilid50Bil1_2021.html |
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| Summary: | The volcanic rocks in Semporna Peninsula, Sabah, Malaysia forms parts of the Miocene subjected slab during
the Miocene-Pliocene orogeny. This study presents new petrographic and geochemical data of volcanic rocks in
Semporna area. The volcanic rocks range in composition from basaltic andesite, andesite, dacite to rhyolite, with
most of the volcanic shows calc-alkaline affinity with a minor tholeiitic feature. The trace elements shows enrichment
in large-ion lithophile elements (LILE) and light rare earth elements (LREE) suggesting that the volcanic rocks have
similar geochemical patterns and might come from similar magma source. The petrochemical data suggests that
volcanic rocks of Semporna shows characteristic of subduction zone (negative Nb, Ta, and Ti). Decreasing magnitude
of Europium anomalies from intermediate to acid lavas suggests an important role of plagioclase in the fractional
crystallization. Negative Ce anomaly in part of Semporna volcanic rocks suggest that those volcanic rocks may related
with emergence of oxygenated deep-sea environment. Tectonic diagrams showed that the Semporna volcanic rocks
were formed in an island arc setting. |
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