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http://dx.doi.org/10.17576/jsm-2019-4811-17
Peranan Subduksi
terhadap Batuan Volkanik Berusia Neogen di Semenanjung Semporna: Perspektif
Petrologi dan Geokimia
(Subduction Roles for
Neogene Volcanic Rocks in Semporna Peninsula: Petrology and Geochemistry
Perspectives)
ELVAENE JAMES1*, AZMAN A. GHANI1, JUNAIDI ASIS2 & NORBERT SIMON3
1Jabatan
Geologi, Fakulti Sains, Universiti Malaya, 50603 Kuala Lumpur, Wilayah
Persekutuan, Malaysia
2Fakulti
Sains dan Sumber Asli, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah, Malaysia
3Program
Geologi, Pusat Sains Bumi dan Alam Sekitar, Fakulti Sains dan Teknologi, Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
Diserahkan: 20 Mac
2019/Diterima: 15 Ogos 2019
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).
Keywords: Neogene; OIB-like;
Semporna Peninsula; subduction; volcanic rocks
ABSTRAK
Batuan volkanik Semenanjung
Semporna yang berusia Neogen terkenal dengan ciri-ciri geokimia
subduksi dan menyerupai-OIB. Proses subduksi yang berlaku semasa
usia Miosen menyebabkan magmatisme kaitan-subduksi diganti dengan
magmatisme menyerupai-OIB. Batuan volkanik berusia Neogen di
Semenanjung Semporna boleh dibahagi kepada basalt, andesit basalt,
andesit dan riolit. Corak yang ditunjukkan oleh unsur major dan
unsur surih mencadangkan magma batuan volkanik di Semenanjung Semporna
telah mengalami penghabluran berperingkat. Berdasarkan kepada tren
daripada mantel primitif dan REE,
3 jenis tren dapat dikenal pasti: Kaitan-subduksi; susutan Nb, Ta,
P dan Ti, pengayaan pada LILE dan LREE dan
susutan terhadap HFSE, menyerupai-OIB;
pengayaan Nb, Ta and Ti, dan MORB; mantel primitif dan REE
hampir rata. Pola REE turut menunjukkan batuan volkanik mempunyai nilai anomali
Eu negatif dan positif, yang menjelaskan pengfraksian plagioklas
dan pengumpulan plagioklas berlaku di dalam magma. Berdasarkan kepada
sekitaran tektonik untuk Semenanjung Semporna, batuan volkanik kaitan-subduksi
mempunyai sekitaran lava arka kepulauan dan basalt pinggir kepingan.
Segitiga FeOT-MgO-Al2O3
pula menunjukkan batuan
volkanik kaitan-subduksi tersebar pada kawasan orogeni dan pemuaian
pusat kepulauan. Sekitaran tektonik untuk batuan volkanik menyerupai-OIB
(basalt, 18L5; andesit basalt, 18L9) dan MORB (andesit basalt, 11L5) ialah
basalt dalam-kepingan dan lava dalam-kepingan yang terbentuk di
sekitaran benua (Segitiga FeOT-MgO-Al2O3).
Kata kunci: Batuan
volkanik; menyerupai-OIB; Semenanjung
Semporna; subduksi; usia Neogen
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*Pengarang untuk surat-menyurat;
email: elvaene_anne@yahoo.com
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