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Arc related dioritic–granodioritic magmatism from southeastern Peninsular Malaysia and its tectonic implication

In Peninsular Malaysia, Late Cretaceous (95-76 Ma) plutons are found within the Eastern Belt. Their compositions are diverse, ranging from biotite granite, hornblende granodiorite, diorite, and gabbro. The Aur Pluton is the easternmost body and is exposed in the Johore Archipelago, southeast of Peni...

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Main Authors: Hazad, Fatin Izzani, Ghani, Azman Abd, Lo, Ching Hua
Format: Article
Published: Elsevier 2019
Subjects:
Q Science (General)
QE Geology
Online Access:http://eprints.um.edu.my/20074/
https://doi.org/10.1016/j.cretres.2018.10.016
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spelling my.um.eprints.200742019-01-22T01:50:58Z http://eprints.um.edu.my/20074/ Arc related dioritic–granodioritic magmatism from southeastern Peninsular Malaysia and its tectonic implication Hazad, Fatin Izzani Ghani, Azman Abd Lo, Ching Hua Q Science (General) QE Geology In Peninsular Malaysia, Late Cretaceous (95-76 Ma) plutons are found within the Eastern Belt. Their compositions are diverse, ranging from biotite granite, hornblende granodiorite, diorite, and gabbro. The Aur Pluton is the easternmost body and is exposed in the Johore Archipelago, southeast of Peninsular Malaysia. The rock types vary from diorite, quartz monzodiorite and granodiorite. Ar-Ar stepheating age of the diorite and zircon U/Pb age of the granodiorite yielded ages of 77.9 ± 2 Ma and 79 ± 0.7 Ma, respectively. The overall major and trace element trends are consistent with two magmatic pulses, i.e., diorite-quartz monzodiorite and granodiorite. The diorite-quartz monzodiorites are characterized by high Fe2O3 (6.7–8.3 wt.%), CaO (5.5–7.6 wt.%), MgO (2.9–4.1 wt.%) and high but variable Sr concentrations (570–1300 ppm). The granodiorites have significantly higher total alkali content (8.49–8.91%), with high K2O concentrations (3.8–4.6%) and low Fe2O3 (4.7–6.5%), CaO (2.7–3.9%) and MgO (1.4–2.0%) concentrations. Low Nb/U and distinct Pb anomalies suggest that both rock types are likely derived from the crust. Furthermore, elevated LREE and trace element contents for the granodiorites, e.g., FTh (10–20 ppm), Pb (10–30 ppm), and U (2–5 ppm), also indicate that upper crustal components are involved in the magma generation. The dioritic rocks are chemically classified as calc-alkaline volcanic arc (VAG) rocks, but they also have field relationships and mineralogies typically associated with an active continental margin (ACM). Elsevier 2019 Article PeerReviewed Hazad, Fatin Izzani and Ghani, Azman Abd and Lo, Ching Hua (2019) Arc related dioritic–granodioritic magmatism from southeastern Peninsular Malaysia and its tectonic implication. Cretaceous Research, 95. pp. 208-224. ISSN 0195-6671 https://doi.org/10.1016/j.cretres.2018.10.016 doi:10.1016/j.cretres.2018.10.016
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic Q Science (General)
QE Geology
spellingShingle Q Science (General)
QE Geology
Hazad, Fatin Izzani
Ghani, Azman Abd
Lo, Ching Hua
Arc related dioritic–granodioritic magmatism from southeastern Peninsular Malaysia and its tectonic implication
description In Peninsular Malaysia, Late Cretaceous (95-76 Ma) plutons are found within the Eastern Belt. Their compositions are diverse, ranging from biotite granite, hornblende granodiorite, diorite, and gabbro. The Aur Pluton is the easternmost body and is exposed in the Johore Archipelago, southeast of Peninsular Malaysia. The rock types vary from diorite, quartz monzodiorite and granodiorite. Ar-Ar stepheating age of the diorite and zircon U/Pb age of the granodiorite yielded ages of 77.9 ± 2 Ma and 79 ± 0.7 Ma, respectively. The overall major and trace element trends are consistent with two magmatic pulses, i.e., diorite-quartz monzodiorite and granodiorite. The diorite-quartz monzodiorites are characterized by high Fe2O3 (6.7–8.3 wt.%), CaO (5.5–7.6 wt.%), MgO (2.9–4.1 wt.%) and high but variable Sr concentrations (570–1300 ppm). The granodiorites have significantly higher total alkali content (8.49–8.91%), with high K2O concentrations (3.8–4.6%) and low Fe2O3 (4.7–6.5%), CaO (2.7–3.9%) and MgO (1.4–2.0%) concentrations. Low Nb/U and distinct Pb anomalies suggest that both rock types are likely derived from the crust. Furthermore, elevated LREE and trace element contents for the granodiorites, e.g., FTh (10–20 ppm), Pb (10–30 ppm), and U (2–5 ppm), also indicate that upper crustal components are involved in the magma generation. The dioritic rocks are chemically classified as calc-alkaline volcanic arc (VAG) rocks, but they also have field relationships and mineralogies typically associated with an active continental margin (ACM).
format Article
author Hazad, Fatin Izzani
Ghani, Azman Abd
Lo, Ching Hua
author_facet Hazad, Fatin Izzani
Ghani, Azman Abd
Lo, Ching Hua
author_sort Hazad, Fatin Izzani
title Arc related dioritic–granodioritic magmatism from southeastern Peninsular Malaysia and its tectonic implication
title_short Arc related dioritic–granodioritic magmatism from southeastern Peninsular Malaysia and its tectonic implication
title_full Arc related dioritic–granodioritic magmatism from southeastern Peninsular Malaysia and its tectonic implication
title_fullStr Arc related dioritic–granodioritic magmatism from southeastern Peninsular Malaysia and its tectonic implication
title_full_unstemmed Arc related dioritic–granodioritic magmatism from southeastern Peninsular Malaysia and its tectonic implication
title_sort arc related dioritic–granodioritic magmatism from southeastern peninsular malaysia and its tectonic implication
publisher Elsevier
publishDate 2019
url http://eprints.um.edu.my/20074/
https://doi.org/10.1016/j.cretres.2018.10.016
_version_ 1643691171568943104
score 13.211869

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