Peranan Subduksi terhadap Batuan Volkanik Berusia Neogen di Semenanjung Semporna: Perspektif Petrologi dan Geokimia

Translated title of the contribution: Subduction roles for neogene volcanic rocks in semporna peninsula: Petrology and geochemistry perspectives

Elvaene James, Azman A. Ghani, Junaidi Asis, Norbert Simon

Research output: Contribution to journalArticle

Abstract

The Neogene volcanic rocks of Semporna Peninsula is well known for subduction and OIB-like geochemical signature. After the Miocene subduction by the Celebes Sea, subduction-related magmatism was replaced by OIB-like magmatism. The Neogene volcanic rocks in Semporna Peninsula vary from basalt, basaltic andesite, andesite and rhyolite. Major elements and trace elements patterns suggested that the Semporna Peninsula volcanic magma underwent fractional crystallization. From the trend of primitive mantle and REE, 3 types of trends were observed: Subduction-related; depleted Nb, Ta, P, Ti, enrichment of LILE and LREE and depleted in HFSE, OIB-like; enrichment of Nb, Ta and Ti, and MORB; almost flat primitive mantle and REE. The REE patterns also shows the volcanic rocks have Eu negative and positive anomaly, which indicate plagioclase fractionation and plagioclase accumulation. According to the tectonic settings for Semporna Peninsula, the subducted-related volcanic rocks have island arc lavas and plate margin basalt setting. In Triangle FeOT-MgO-Al2O3, the subducted-related volcanic rocks scattered at the orogeny and spreading center islands areas. The tectonic settings for OIB-like (basalt, 18L5; basaltic andesite, 18L9) and MORB (basaltic andesite, 11L5) volcanic rocks are categorized into within-plate basalt and within-plate lavas which occurred in continental setting (Triangle FeOT-MgO-Al2O3).

Original languageMalay
Pages (from-to)2473-2481
Number of pages9
JournalSains Malaysiana
Volume48
Issue number11
DOIs
Publication statusPublished - 1 Jan 2019

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petrology
Neogene
volcanic rock
subduction
ocean island basalt
geochemistry
andesite
basalt
rare earth element
mid-ocean ridge basalt
tectonic setting
magmatism
plagioclase
mantle
spreading center
rhyolite
fractional crystallization
orogeny
island arc
fractionation

ASJC Scopus subject areas

  • General

Cite this

Peranan Subduksi terhadap Batuan Volkanik Berusia Neogen di Semenanjung Semporna : Perspektif Petrologi dan Geokimia. / James, Elvaene; Ghani, Azman A.; Asis, Junaidi; Simon, Norbert.

In: Sains Malaysiana, Vol. 48, No. 11, 01.01.2019, p. 2473-2481.

Research output: Contribution to journalArticle

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