Multiple felsic events within post-10 Ma volcanism, Southeast Australia: inputs in appraising proposed magmatic models

Sutherland, F L; Graham, Ian T.; Hollis, J.D.; Meffre, Sébastien; Zwingmann, Horst; Jourdan, Fred; Pogson, Ross E.

doi:10.1080/08120099.2014.883640

Cited by 18 publications

(10 citation statements)

References 103 publications

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“…Elsewhere, upper mantle xenoliths with carbonatitic reactions are recorded in young basalt fields in SE Australia [119]. Vent deposits in this field include zircon megacrysts that show transitional silicate-carbonatitic affinities [120].…”

Section: Carbonatitic Signatures In Ratanakiri Zirconsmentioning

confidence: 99%

Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology—Revelations into the Underlying Lithospheric Mantle

et al. 2018

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Zircon xenocrysts from alkali basalts in Ratanakiri Province, Cambodia represent a unique low-Hf zircon within a 12,000 km long Indo-Pacific megacryst zone. Colorless, yellow, brown, and red crystals ({100}, {101}, subordinate {211}, {1103}), with hopper growth and corrosion features range up to 20 cm in size. Zircon chemistry indicates juvenile, Zr-saturated, mantle-derived alkaline melt (Hf 0.6-0.7 wt %, Y <0.2 wt %, U + Th + REE (Rare-Earth Elements) < 600 ppm, Zr/Hf 66-92, Eu/Eu* N~1 , positive Ce/Ce* N , HREE (Heavy REE) enrichment). Incompatible element depletion with increasing Yb/Sm N from core to rim at~constant Hf suggests single stage growth. Ti-in-zircon temperatures (~570-740 • C) are lower than predicted by crystal morphology (800-900 • C) and decrease from core to rim (∆T = 10-50 • C). The δ 18 O values (4.88 to 5.01 Abstract: Zircon xenocrysts from alkali basalts in Ratanakiri Province, Cambodia represent a unique low-Hf zircon within a 12,000 km long Indo-Pacific megacryst zone. Colorless, yellow, brown, and red crystals ({100}, {101}, subordinate {211}, {1103}), with hopper growth and corrosion features range up to 20 cm in size. Zircon chemistry indicates juvenile, Zr-saturated, mantlederived alkaline melt (Hf 0.6-0.7 wt %, Y <0.2 wt %, U + Th + REE (Rare-Earth Elements) < 600 ppm, Zr/Hf 66-92, Eu/Eu*N ~1, positive Ce/Ce*N, HREE (Heavy REE) enrichment). Incompatible element depletion with increasing Yb/SmN from core to rim at ~ constant Hf suggests single stage growth. Ti-in-zircon temperatures (~570-740 C) are lower than predicted by crystal morphology (800-900 C) and decrease from core to rim (T = 10-50 C). The  18 O values (4.88 to 5.01‰ VSMOW (Vienna Standard Mean Ocean Water)) are relatively low for xenocrysts from the zircon Indo-Pacific zone (ZIP). The 176 Hf/ 177 Hf values (+ εHf 4.5-10.2) give TDepleted Mantle model source ages of 260-462 Ma and TCrustal ages of 391-754 Ma. The source magmas reflect variably depleted lithospheric mantle with little supracrustal input. Zircon U-Pb (0.88-1.56 Ma) and (U-Th)/He (0.86-1.02 Ma) ages are older than host basalt ages (~0.7 Ma), which suggests limited residence before transport. Zircon genesis suggests Zr-saturated, Al-undersaturated, carbonatitic-influenced, low-degree partial melting (<1%) of peridotitic mantle at ~60 km beneath the Indochina terrane.

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Section: Carbonatitic Signatures In Ratanakiri Zirconsmentioning

confidence: 99%

Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology—Revelations into the Underlying Lithospheric Mantle

et al. 2018

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“…1; Wellman and McDougall, 1974a). The key attribute used to distinguish the two groups is that central volcanoes, although dominantly basaltic, include a component of felsic flows and/or intrusions, whereas lava fields are nearly entirely basaltic, with a few exceptions of limited felsic flows (Wellman and McDougall, 1974a;Sutherland et al, 2014). The central volcanoes form a series of northsouth chains of bimodal shield volcanoes along the east coast of Australia ( Fig.…”

Section: Geological Background Cenozoic Volcanism In Eastern Australiamentioning

confidence: 99%

“…6 Ma Macedon-Trentham province in Victoria ( Fig. 1; Sutherland et al, 2014). Based on 40 Ar/ 39 Ar ages of the final felsic products erupted from each central volcano, the overall north-south chains form age-progressive tracks that become younger to the south (Cohen et al, 2013).…”

Section: Geological Background Cenozoic Volcanism In Eastern Australiamentioning

confidence: 99%

“…In order to include east Australian volcanism in our tectonic reconstructions, we compiled a data set of previous geochronological results (Supplemental Material 1 ) from east Australian central volcanoes and lava fields, largely assembled by Vasconcelos et al (2008). We incorporated additional published U-Pb (Sutherland et al, 2012(Sutherland et al, , 2014, K-Ar (Wyborn and Owen, 1986;Gray and McDougall, 2009), and 40 Ar/ 39 Ar geochronology results (Matchan and Phillips, 2011;Cohen et al, 2013;Sutherland et al, 2014) and, as described in detail in the following, we added new 40 Ar/ 39 Ar data from four key east Australian volcanic provinces (Peak Range, Springsure, Bauhinia, and Monto; Fig. 5).…”

Section: Geochronology Compilationmentioning

confidence: 99%

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Animated reconstructions of the Late Cretaceous to Cenozoic northward migration of Australia, and implications for the generation of east Australian mafic magmatism

Jones¹,

Verdel²,

Crossingham³

et al. 2017

Geosphere

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Details of the Late Cretaceous-Cenozoic migration of the Australian continent have been sources of contention since the 1960s. Two types of apparent polar wander paths (APWPs) have emerged from previous paleomagnetic studies: one group based on sedimentary and lateritic data that includes relatively linear northward motion of Australia away from Antarctica, and a second group, based on basaltic and lateritic data, that includes significant longitudinal movement of the Australian continent. This study compares the migration and evolution of the Australian plate over the past 100 m.y. using these two competing paths. Our animated reconstructions illustrate the relative motion of the Australian plate, the formation of Cenozoic volcanic provinces in eastern Australia, the opening of the Coral and Tasman Seas, and the docking of the Ontong Java Plateau with the Solomon Islands. The reconstructions incorporate new 40 Ar/ 39 Ar and previously published geochronology data from Late Cretaceous to Cenozoic east Australian mafic to felsic vol canism in order to evaluate potential relationships between volcanism, changes in the motion of the Australian plate, and the opening of the Tasman and Coral Seas. We conclude that the APWP that includes significant longitudinal movement is more compatible than the linear path with both observable geological features (such as volcanic tracks) and the global moving hotspot reference frame. Our reconstructions reveal little correspondence between opening of the Tasman and Coral Seas and eruption of east Australian lava fields. However, the reconstructions and new 40 Ar/ 39 Ar geochronology illustrate that the formation of east Australian Late Cretaceous to Cenozoic central volcanoes and lava fields were closely linked, both temporally and spatially, and we suggest that edgedriven convection was an important process in the generation of both types of east Australian volcanic provinces.

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“…Carbonatites seem absent in Cambodian surface geology, although they appear in adjacent reactions are recorded in young basalt fields in SE Australia [115]; vent deposits in this field include zircon megacrysts that show transitional silicate-carbonatitic affinities [116].…”

Section: Carbonatitic Signatures In Ratanakiri Zirconsmentioning

confidence: 96%

Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology—Revelations into the Underlying Lithospheric Mantle

Piilonen¹,

Sutherland²,

Danišík³

et al. 2018

Preprint

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Zircon xenocrysts from alkali basalts in Ratanakiri Province, Cambodia, represent a unique low-Hf zircon, within a 12,000 km long Indo-Pacific megacryst zone. Colourless, yellow, brown and red crystals ({100}, {101}, subordinate {211}, {1103}), with hopper growth and corrosion features, range up to 20 cm in size. Zircon chemistry implicates juvenile, Zr-saturated, mantle-derived alkaline melt (Hf 0.6–0.7 wt%, Y <0.2 wt%, U+Th+REE <600 ppm, Zr/Hf 66–92, Eu/Eu*N ~ 1, positive Ce/Ce*N, HREE enrichment). Incompatible element depletion with increasing Yb/SmN from core to rim at ~ constant Hf suggests single stage growth. Ti-in-zircon temperatures (~570–740 °C) are lower than predicted by crystal morphology (800–900 °C) and decrease from core to rim (DT = 10–50 °C). The d18O values (4.88 to 5.01&permil; VSMOW) are relatively low for xenocrysts from the zircon Indo-Pacific zone (ZIP). The 176Hf/177Hf values (+ εHf 4.5–10.2) give TDepleted Mantle model source ages of 260–462 Ma and TCrustal ages of 391–754 Ma. The source magmas reflect variably depleted lithospheric mantle with little supracrustal input. Zircon U-Pb (0.88–1.56 Ma) and (U-Th)/He (0.86–1.02 Ma) ages are older than host basalt ages (~0.7 Ma), suggesting limited residence before transport. Zircon genesis suggests Zr-saturated, Al-undersaturated, carbonatitic-influenced, low-degree partial melting (<1%) of peridotitic mantle at ~60 km beneath the Indochina terrane.

show abstract

Multiple felsic events within post-10 Ma volcanism, Southeast Australia: inputs in appraising proposed magmatic models

Cited by 18 publications

References 103 publications

Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology—Revelations into the Underlying Lithospheric Mantle

Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology—Revelations into the Underlying Lithospheric Mantle

Animated reconstructions of the Late Cretaceous to Cenozoic northward migration of Australia, and implications for the generation of east Australian mafic magmatism

Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology—Revelations into the Underlying Lithospheric Mantle

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Multiple felsic events within post-10 Ma volcanism, Southeast Australia: inputs in appraising proposed magmatic models

Cited by 18 publications

References 103 publications

Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology—Revelations into the Underlying Lithospheric Mantle

Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology—Revelations into the Underlying Lithospheric Mantle

Animated reconstructions of the Late Cretaceous to Cenozoic northward migration of Australia, and implications for the generation of east Australian mafic magmatism

Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia&mdash;Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology&mdash;Revelations into the Underlying Lithospheric Mantle

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Zircon Xenocrysts from Cenozoic Alkaline Basalts of the Ratanakiri Volcanic Province (Cambodia), Southeast Asia—Trace Element Geochemistry, O-Hf Isotopic Composition, U-Pb and (U-Th)/He Geochronology—Revelations into the Underlying Lithospheric Mantle