David Murphy

David Murphy
Queensland University of Technology | QUT · School of Earth, Environmental and Biological Sciences

About

44
Publications
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666
Citations
Additional affiliations
June 2006 - present
Queensland University of Technology
Position
  • Lecturer

Publications

Publications (44)
Article
Archean greenstone belts contain low grade metamorphic volcanic sequences with localised examples of preserved original volcanic textures and relict magmatic minerals, which are invaluable for inferring volcanic processes and by extension magma genesis. A feature observed in many Archean greenstone belts but rare in modern volcanic rocks is varioli...
Article
The chemistry of the major reservoirs in the silicate Earth reflects a long history of differentiation into- and interaction between- incompatible element enriched crust and depleted mantle. Evidence from ¹⁴²Nd variability in ancient mantle-derived rocks imply such differentiation began very early in Earth's history, while the short lived ¹⁴⁶Sm (ha...
Article
In conjunction with major, trace and rare earth element data, this study presents the first whole-rock LuHf isotope analyses of mafic-ultramafic rocks of the c. 3.3 Ga Kromberg type-section in the Barberton greenstone belt of South Africa. Three compositionally distinct volcanic rock types are identified namely Group 1 metabasalts, Group 2 metabasa...
Article
The time-interval between 2.8 and 2.7 Ga is associated with the worldwide appearance of thick tholeiite-komatiite successions. However, their origin and affiliation, if any, is poorly understood. The Eastern Goldfields Superterrane of the Yilgarn Craton, Western Australia, is dominated by the 2.7 Ga Kalgoorlie and Kurnalpi terranes, both of which c...
Article
Carbonatite intrusive complexes are important hosts for Rare Earth Elements (REE) deposits and are commonly affected by surficial weathering processes. Mount Weld REE deposit of Western Australia is one of the world’s richest REE deposits and here we present whole-rock and REE mineral geochemical data on compositions of primary and weathered carbon...
Conference Paper
Full-text available
Mount Weld, one of world's richest REE deposits, is located in a weathered laterite cap of carbonatite [1, 2]. The laterite samples show REE2O3 content reaching 51.8 wt. % representing rocks with some of the highest REE content known to date. A special characteristic of Mount Weld laterite is the presence of intense negative Ce anomaly on chondrite...
Article
The Late Jurassic Springbok Sandstone in the Surat Basin, Australia, is highly heterogeneous in terms of lithology and hydrogeological properties. This heterogeneity is poorly defined in well logs, due, in part, to clay phases that do not exhibit a prominent gamma ray signature. The resulting uncertainties in the hydrogeological properties are prop...
Article
Full-text available
Rationale: Strontium isotopes are valuable markers of provenance in a range of disciplines. Limited amounts of Sr in low mass samples such as insects mean that conventional Sr isotope analysis preclude its use for geographic origins in many ecological studies or in applications such as biosecurity. Here we test the viability of using ICP-MS/MS wit...
Article
Full-text available
During the early Archaean, the Earth was too hot to sustain rigid lithospheric plates subject to Wilson Cycle-style plate tectonics. Yet by that time, up to 50% of the present-day continental crust was generated. Preserved continental fragments from the early Archaean have distinct granite-dome/greenstone-keel crust that is interpreted to be the re...
Article
We present a microstructural and UPb systematics study comparing pristine, thermally annealed (TA) and chemically abraded (CA) ~ 3500 Ma zircon from a quartz-dioritic gneiss, with the aim to improve pre-analytical workflows for more accurate and precise LA-ICP-MS UPb dating of ancient zircon. Four zircon domains are identified: i) low- to medium-U...
Article
Fires occur frequently over large parts of the Earth’s surface. They potentially exert a significant influence on the mineralogical and geochemical characteristics of an environment that is otherwise considered to be dominated by low temperature processes. We test this hypothesis by comparing the mineralogy and geochemistry of i) magnetic, iron-ric...
Article
The early Archaean East Pilbara Terrane of the Pilbara Craton represents the archetypical granite dome – greenstone keel terrain and preserves much of the primary geological features of dome-and-keel formation. Here we present the first detailed lithostratigraphic and structural transect from marginal gneisses of the Muccan Granitic Complex through...
Article
Full-text available
The Kalkarindji continental flood basalt province of northern Australia erupted in the mid Cambrian (c. 511-505 Ma). It now consists of scattered basaltic lava fields, the most extensive being the Antrim Plateau Volcanics (APV) - a semi-continuous outcrop (c. 50,000 km<sup>2</sup>) reaching a maximum thickness of 1.1 km. Cropping out predominately...
Conference Paper
Full-text available
The Kalkarindji Continental Flood Basalt Province (CFBP) is the oldest igneous province in the Phanerozoic. Erupted in the mid-Cambrian (505-510 Ma) [1], it is estimated volumes of lava up to 1.5 x 10<sup>5</sup> km<sup>3</sup> could have been erupted, making this similar in size to the better known Columbia River Basalts, USA. Relatively little i...
Article
Full-text available
Shatsky Rise, an early Cretaceous igneous oceanic plateau in the NW Pacific, comprises characteristics that could be attributed to either formation by shallow, plate tectonic-controlled processes or to an origin by a mantle plume (head). The plateau was drilled during Integrated Ocean Drilling Program (IODP) Expedition 324. Complementary to a recen...
Conference Paper
Full-text available
The Kalkarindji flood basalts are remnants of the world’s most ancient CFBP, for which significant thicknesses of the lava succession still remain preserved. This 505-510 Ma LIP now consists of scattered basaltic suites across northern and central Australia, which together indicate a minimum eruptive volume of 1.5 x 10<sup>5</sup> km<sup>3</sup>, t...
Article
Full-text available
Cite as: Author(s) (2011), Title, Abstract V13C-2617 presented at 2011 Fall Meeting, AGU, San Francisco, Calif., 5-9 Dec. The Kalkarindgi CFBP (c. 505 - 510 Ma) is an extremely rare ancient CFBP for which significant thicknesses of the lava succession still remain preserved. Accordingly it provides a unique insight regarding Late Proterozoic - ear...
Article
Shatsky Rise is located on the northwest Pacific plate, and has an elongated structure from southeast to northwest. It represents a large oceanic plateau (up to 500 km wide) that was formed between 140-150 Ma in an active spreading ridge at relatively high emplacement rates (1.2-4.6 km3/y), similar to those of some flood basalt provinces [1]. Wheth...
Article
Full-text available
Drilling during Ocean Drilling Program Leg 198 at Site 1213 recovered three massive basalt units (8–15 m thick) from the southern flank of Tamu Massif at Shatsky Rise. Originally, these igneous units were interpreted to represent three diabase sills. During Integrated Ocean Drilling Program Expedition 324, this core was redescribed leading to the n...
Article
Full-text available
Parent/daughter isotope ratios of the enriched mantle (EM) and high-μ (HIMU) mantle reservoirs sampled by ocean island basalt (OIB), kimberlite and carbonatite magmas are produced entirely by CO2-fluxed melting in the lower mantle. The region of formation of the HIMU-EM complementary reservoirs is interpreted to be near the base of the lower mantle...
Article
Here we search for evidence of the existence of a sub-chondritic ¹⁴²Nd/¹⁴⁴Nd reservoir that balances the Nd isotope chemistry of the Earth relative to chondrites. If present, it may reside in the source region of deeply sourced mantle plume material. We suggest that lavas from Hawai’i with coupled elevations in ¹⁸⁶Os/¹⁸⁸Os and ¹⁸⁷Os/¹⁸⁸Os, from Ice...
Article
To better understand the nature of the processes during the generation and evolution of mantle plumes it is imperative that geochemical, geophysical and mineral experimental observations are combined to generate realistic computational models. In an axi-symmetrical finite element model we make use of observations that; (1) some mantle plumes can be...
Article
Evolution of mantle chemical heterogeneity reflects a spectrum of processes. Nature of reservoirs has been inferred from radiogenic isotope and trace element systematics of mid-ocean ridge basalts (MORB) and ocean island basalts (OIB) [1]. Carbonatites, kimberlites and lamproites [2-4] also sample depleted and enriched reservoirs, however, their or...
Article
We present new He and Pb isotope and trace element data for Inaccessible Island and Tristan da Cunha, which confirms narrow ranges in He isotopes (5.5Ra+-0.6) and Pb isotopes (207Pb/206Pb=18.59+-0.10; 207Pb/204Pb=15.54+-0.01) and enrichment in incompatible elements (La/Yb=22-38) for the Tristan plume. We use this data to test models on the nature o...
Article
Full-text available
The first terrestrial Pb-isotope paradox refers to the fact that on average, rocks from the Earth's surface (i.e. the accessible Earth) plot significantly to the right of the meteorite isochron in a common Pb-isotope diagram. The Earth as a whole, however, should plot close to the meteorite isochron, implying the existence of at least one terrestri...
Article
Full-text available
Petrogenetic models for the origin of lamproites are evaluated using new major element, trace element, and Sr, Nd, and Pb isotope data for Holocene lamproites from the Gaussberg volcano in the East Antarctic Shield. Gaussberg lamproites exhibit very unusual Pb isotope compositions (Pb-206/Pb-204 = 17.44-17.55 and Pb-207/Pb-204 = 15.56-15.63), which...

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