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
dc.contributor.author | Piilonen, P.C. | |
dc.contributor.author | Sutherland, F.L. | |
dc.contributor.author | Danišík, M. | |
dc.contributor.author | Poirier, G. | |
dc.contributor.author | Valley, J.W. | |
dc.contributor.author | Rowe, R. | |
dc.date.accessioned | 2023-03-09T07:59:43Z | |
dc.date.available | 2023-03-09T07:59:43Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Piilonen, P.C. and Sutherland, F.L. and Danišík, M. and Poirier, G. and Valley, J.W. and Rowe, R. 2018. 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. Minerals. 8 (12): ARTN 556. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/90786 | |
dc.identifier.doi | 10.3390/min8120556 | |
dc.description.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, 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/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 _18O values (4.88 to 5.01‰ VSMOW (Vienna Standard Mean Ocean Water)) are relatively low for xenocrysts from the zircon Indo-Pacific zone (ZIP). The176Hf/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), 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. | |
dc.language | English | |
dc.publisher | MDPI | |
dc.relation.sponsoredby | http://purl.org/au-research/grants/arc/DP160102427 | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | |
dc.subject | Science & Technology | |
dc.subject | Physical Sciences | |
dc.subject | Geochemistry & Geophysics | |
dc.subject | Mineralogy | |
dc.subject | Mining & Mineral Processing | |
dc.subject | zircon | |
dc.subject | xenocryst | |
dc.subject | alkali basalt | |
dc.subject | Ratanakiri Volcanic Province | |
dc.subject | trace elements | |
dc.subject | O-isotopes and Hf-isotopes | |
dc.subject | U-Pb | |
dc.subject | (U-Th)/He | |
dc.subject | IGNEOUS ALBITITE DIKES | |
dc.subject | CARBONATITE METASOMATISM | |
dc.subject | OXYGEN ISOTOPES | |
dc.subject | OROGENIC LHERZOLITES | |
dc.subject | FELDSPAR XENOCRYSTS | |
dc.subject | WESTERN PYRENEES | |
dc.subject | HIGH-PRECISION | |
dc.subject | FISSION-TRACK | |
dc.subject | RED ZIRCON | |
dc.subject | SAPPHIRE | |
dc.title | 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 | |
dc.type | Journal Article | |
dcterms.source.volume | 8 | |
dcterms.source.number | 12 | |
dcterms.source.issn | 2075-163X | |
dcterms.source.title | Minerals | |
dc.date.updated | 2023-03-09T07:59:43Z | |
curtin.accessStatus | Open access | |
curtin.contributor.orcid | Danišík, Martin [0000-0002-0885-4938] | |
curtin.identifier.article-number | ARTN 556 | |
dcterms.source.eissn | 2075-163X | |
curtin.contributor.scopusauthorid | Danišík, Martin [12239479000] |