Roland Maas

The nature and origin of pigments in black opal from Lightning Ridge, New South Wales, Australia

Publisher: Informa UK Limited

Date: 04-2019

DOI: 10.1080/08120099.2019.1587643

Reconnaissance Basement Geology and Tectonics of South Zealandia

Publisher: American Geophysical Union (AGU)

Date: 02-2019

DOI: 10.1029/2018TC005116

A single-column extraction chemistry for isotope dilution U-Pb dating of carbonate

Publisher: Elsevier BV

Date: 2020

DOI: 10.1016/J.CHEMGEO.2019.119311

A comparison of geochronological methods commonly applied to kimberlites and related rocks: Three case studies from Finland

Publisher: Elsevier BV

Date: 12-2020

DOI: 10.1016/J.CHEMGEO.2020.119899

Petrology, Age, and Rift Origin of Ultramafic Lamprophyres (Aillikites) at Mount Webb, a New Alkaline Province in Central Australia

Publisher: American Geophysical Union (AGU)

Date: 10-2023

DOI: 10.1029/2023GC011120

Pb-isotope ratios and the petrogenesis of the Tunkillia Suite, Gawler Craton

Publisher: Informa UK Limited

Date: 17-05-2021

DOI: 10.1080/08120099.2021.1915868

Population demographics of golden perch (Macquaria ambigua) in the Darling River prior to a major fish kill: A guide for rehabilitation

Publisher: CSIRO Publishing

Date: 02-09-2022

DOI: 10.1071/MF21033

Abstract: An understanding of population demographics and life history processes is integral to the rehabilitation of fish populations. In Australia’s highly modified Murray–Darling Basin, native fish are imperilled and fish deaths in the Darling River in 2018–19 highlighted their vulnerability. Golden perch (Macquaria ambigua) is a long-lived percichthyid that was conspicuous in the fish kills. To guide population rehabilitation in the Darling River, pre-fish kill age structure, provenance and movement of golden perch were explored using otolith microstructure and chemistry (87Sr/86Sr). Across the Lower and Mid-Darling River, recruitment was episodic, with dominant cohorts associated with years characterised by elevated discharge. There was substantial variability in age structure, recruitment source and movement patterns between the Lower and Mid-Darling River. In the Mid-Darling River, tributaries were an important recruitment source, whereas in the Lower Darling fish predominantly originated in the Darling River itself. Downstream movement of juveniles, upstream migration of adults and return movements to natal locations were important drivers of population structure. Restoring resilient golden perch populations in the Darling River will be reliant on mitigating barriers to movement, promoting a connected mosaic of recruitment sources and reinstating the hydrological and hydraulic factors associated with spawning, recruitment and dispersal. Globally, increasing water resource development and climate change will necessitate such integrated approaches to the management of long-lived migratory riverine fishes.

Corrections for initial isotopic disequilibrium in the speleothem U-Pb dating method

Publisher: Elsevier BV

Date: 10-2019

DOI: 10.1016/J.QUAGEO.2019.101009

Otolith chemistry delineates the influence of natal origin, dispersal and flow on the population dynamics of golden perch (Macquaria ambigua) in a regulated river

Publisher: CSIRO Publishing

Date: 29-06-2021

DOI: 10.1071/MF20280

Abstract: For riverine fishes threatened by fragmentation and flow modification, effective management requires an understanding of when and where key life history processes (spawning, recruitment and movement) take place. The structural and chemical properties of otoliths provide a unique means to recount a fish’s life in time and space. We investigated the age structure of the migratory, pelagic-spawning golden perch (Macquaria ambigua) in the Murray River, Australia, and used water and otolith 87Sr/86Sr ratios to delineate the natal origin and movement of fish from discrete cohorts. Water 87Sr/86Sr was distinct among the Darling River (a major tributary) and lower and mid-Murray River. Otolith chemistry revealed golden perch collected in the lower Murray River were progeny of spawning in either the Murray or Darling rivers, during years characterised by within-channel rises in flow, or in both rivers in a year of overbank flooding. Movement of juvenile fish from the Darling River substantially influenced population structure in the lower Murray River, whereby post-flood population growth was largely due to the immigration of age-1+ fish. This study demonstrates the potential importance of tributary recruitment sources, dispersal and connectivity on main-stem population dynamics and the utility of otolith chemistry for spatially reconciling population structure and the life histories of freshwater fishes.

Genesis of the Paleoproterozoic Ammassalik Intrusive Complex, south-east Greenland

Publisher: Elsevier BV

Date: 09-2018

DOI: 10.1016/J.PRECAMRES.2018.06.016

Naturaliste Plateau: constraints on the timing and evolution of the Kerguelen Large Igneous Province and its role in Gondwana breakup

Publisher: Informa UK Limited

Date: 03-10-2017

DOI: 10.1080/08120099.2017.1367326

Geodynamic and Isotopic Constraints on the Genesis of Kimberlites, Lamproites and Related Magmas From the Finnish Segment of the Karelian Craton

Publisher: American Geophysical Union (AGU)

Date: 08-2022

DOI: 10.1029/2021GC010324

Abstract: Despite the scientific and economic significance of kimberlites and related magmas, their origin is unclear. Here, we address this issue using whole‐rock and perovskite‐derived Sr‐Nd‐Hf isotopes for the three occurrences of kimberlite, l roites and ultramafic l rophyres (UMLs) in Finland. Mesoproterozoic olivine l roites at Lentiira‐Kuhmo and UMLs at Kuusamo have different isotopic signatures yet were emplaced contemporaneously at 1,200 Ma in response to an extensional regime linked to the Baltica‐Laurentia breakup. The low εNd (i) and εHf (i) values of the olivine l roites are consistent with an enriched subcontinental lithospheric mantle (SCLM) source while UML compositions are intermediate between those of typical kimberlites and l roites and are interpreted to reflect mixing of asthenospheric melts and ∼10%–15% of melts sourced from metasomatized SCLM. The ∼750 Ma Kuusamo kimberlites, are probably linked to the mantle plume activity that initiated Rodinia's break‐up, exhibiting homogenous isotopic compositions which mirror the prominent Geodynamic and Source Constraints for ∼1,200 Ma Olivine L roite and Ultramafic L rophyre Magmatism in Eastern Finland (PREMA)‐like signature of kimberlites globally. By contrast, ∼620–585 Ma Kaavi‐Kuopio kimberlites show limited range in εNd (i) and 87 Sr/ 86 Sr (i) but have remarkably heterogeneous εHf (i) (+6.5 to −6.3) with a temporal trend toward lower εHf (i) values. While the Kuusamo kimberlites erupted during the early stage of continental break‐up, the Kaavi‐Kuopio kimberlites were emplaced when Rodinia break‐up was completed, coeval with formation of the Central Iapetus large igneous province. Magmas forming the Kaavi‐Kupio kimberlites may have formed from an upwelling mantle source similar to PREMA modified by increasing incorporation (up to 10%) of recycled crustal material through time accounting for the trend toward lower εHf (i) in these kimberlites.

Linkage Projects - Grant ID: LP150100717

Start Date: 03-2016

End Date: 12-2019

Amount: $229,000.00

Funder: Australian Research Council

Linkage Projects - Grant ID: LP130100438

Start Date: 01-2014

End Date: 06-2018

Amount: $193,608.00

Funder: Australian Research Council

Linkage Projects - Grant ID: LP0562610

Start Date: 03-2006

End Date: 12-2009

Amount: $252,619.00

Funder: Australian Research Council

Discovery Projects - Grant ID: DP0773700

Start Date: 2007

End Date: 12-2009

Amount: $329,000.00

Funder: Australian Research Council

Linkage Projects - Grant ID: LP160100483

Start Date: 12-2016

End Date: 12-2021

Amount: $418,000.00

Funder: Australian Research Council

Discovery Projects - Grant ID: DP110102185

Start Date: 03-2011

End Date: 02-2014

Amount: $620,000.00

Funder: Australian Research Council

Linkage Infrastructure, Equipment And Facilities - Grant ID: LE0989067

Start Date: 2009

End Date: 06-2010

Amount: $950,000.00

Funder: Australian Research Council