The shallow depth emplacement of mafic intrusions on a magma-poor rifted margin : An example from the Bight Basin, Southern Australia

This work comprises a part of the Great Australian Bight Deepwater Marine Program (GABDMP) for funding this project. The GABDMP is a CSIRO research program, sponsored by Chevron Australia the results of which will be made publically available. 3D seismic data was gratefully provided by TGS. Dougal Jerram and Craig Magee are thanked for constructive reviews; Adam Bumby is thanked for editorial handling.Peer reviewedPostprin

Nature and preservation of Late Jurassic breakup-related volcanism in the carnarvon basin, North West shelf, Australia

Funding This work was funded through a postgraduate scholarship from the University of Adelaide, Faculty of Engineering Computer and Mathematical Sciences, and also by ASEG Research Foundation Grant no. RF19P01. These funding sources had no involvement in study design; in the collection, analysis and interpretation of data; in the writing of the report; or in the decision to submit the article for publication. Acknowledgements We would like to thank Iain Campbell, formerly Chief Petroleum Geophysicist at the South Australian Department for Energy and Mining for arranging the stitching together of multiple SEGY component files for the Indian 3D seismic reflection survey which was instrumental for interpretation of the Toro Volcanic Complex. We would also like to thank both Simon Lang and particularly Victorien Paumard of the Centre for Energy Geoscience, University of Western Australia, for numerous discussions around the development of the Barrow Delta in the Exmouth Sub-Basin and Exmouth Plateau. We thank Tiago Alves for editorial guidance, and the constructive reviews provided by Victorien Paumard, Natasha Stanton, Gerome Calves, Chris Elders, Kamaldeen Omosanya and one anonymous referee.Peer reviewe

Contemporary stress orientations in the Faroe-Shetland region

The Faroe-Shetland Region (FSR) of the NE Atlantic continental margin contains a number of complexly structured Mesozoic-Palaeogene-age rift basins, but in comparison to the contiguous British Isles and North Sea Basin, the state of crustal stress in the FSR is poorly understood. The orientation of maximum horizontal compressional stress (σHmax) across most of NW Europe is ~NW-SE, which is considered to be controlled by forces acting at the plate boundaries. We have determined 16 B-D quality σHmax orientations based on borehole breakouts interpreted in petroleum wells, and define three distinct stress provinces within the FSR. Stress orientations in the NE are ~NW-SE, consistent with the regional pattern of stresses in NW Europe and local neotectonic structural trends. However, contemporary stress orientations in the central and SW of the FSR exhibit short-wavelength (distances <10-50 km) variation, with NE-SW, N-S and E-W orientations that are parallel or sub-parallel to underlying structural trends. This variation is interpreted in terms of stress deflections towards weak faults that downthrow the Mesozoic-Cenozoic sedimentary successions against basement highs. These local-scale sources are superposed on a background ~WNW-ESE σHmax orientation that is controlled by both plate boundary forces and regional-scale sources of stresses

Three-Dimensional Seismic Imaging of Ancient Submarine Lava Flows : An Example From the Southern Australian Margin

This work comprises a part of the Great Australian Bight Deepwater Marine Program (GABDMP) for funding this project. The GABDMP is a CSIRO research program, sponsored by Chevron Australia the results of which will be made publicly available. 3D seismic data was gratefully provided by TGS. IHS are thanked for access to seismic interpretation software. Spectral decomposition was carried out using Foster-Findlay Associates Geoteric Software. Sverre Planke and Tracy Gregg are thanked for constructive reviews.Peer reviewedPublisher PD

Geomechanical modelling and consequences for fluid-flow in complex rifted settings: A case study in the Otway Basin, Australia

Poster presented at the EGU General Assembly 2019Geomechanical modelling of dilation tendency has been completed on more than 900 faults from nine three dimensional seismic surveys within the Otway Basin, Australia. As the in-situ stress regime within the basin is currently debated, scenarios of normal, strike-slip and reverse regimes of in-situ stress have been modelled. Additionally, the stability of natural fractures from seven wellbore image logs has been modelled under the same scenarios, with the consequences for each explored. NW-SE striking faults that define the basin’s major structural fabric are at critical risk of dilation irrespective of the regime of in-situ stress, while similarly striking fractures require very low (<5MPa under a strike-slip scenario) increases in pore pressure in order to be reactivated. N-S striking and W-E striking faults show lower risks for reactivation although their propensity to dilate is still significant. Our results in part explain why fault seal within the Otway Basin has been historically so poor, and suggest that while natural fracture networks may be optimally oriented for reactivation in order to increase secondary permeability – promising for unconventional prospectively - there is a high associated risk with respect to up-dip contamination along regional faults. This case study also provides insight into possible fluid flow pathways within other more frontier passive margin settings.Hugo Burgin, Khalid Amrouch, David Kulikowski, Simon Holford, and Philippe Robio

Effects of Mineral Oils on Host Selection Behavior of Diaphorina Citri

Response of Diaphorina citri Kuwayama (Hemiptera: Psyllidae) on citrus leaves treated with horticultural and agricultural mineral oil (HMO & AMO) was evaluated under laboratory condition in choice and non-choice trials. Combination of HMO and AMO at concentration of 0 up to 2% was applied to citrus leaves. Mineral oil applications significantly reduced the proportion of D. citri stayed on citrus leaves for feeding with the proposed mechanisms: 1) oils covered leaves thus hampered it for releasing volatile compounds, 2) oil film preventing the direct contact of tarsus or palpus to leaf surfaces, and 3) the volatile compounds produced by mineral oils also blended with plant volatiles in the atmosphere and reduced the probability of olfactory receptors capturing the olfactory cues for locating the feeding site. Mineral oils also increased the mortality of D. citri due to the refusion for feeding on the treated citrus leaves. The effect of AMO was more prominent than HMO. Tanggapan Diaphorina citri Kuwayama (Hemiptera: Psyllidae) pada daun jeruk yang diperlakukan dengan minyak mineral (HMO dan AMO) dievaluasi dengan metode pilihan maupun tanpa pilihan di laboratorium. Kombinasi antara HMO dan AMO pada konsentrasi 0% sampai dengan 2% diaplikasikan pada daun jeruk. Minyak mineral secara nyata menurunkan proporsi D. citri hinggap untuk makan pada daun jeruk, yang mungkin disebabkan oleh mekanisme: 1) minyak melapisi daun sehingga tidak mampu melepaskan senyawa volatil, 2) lapisan minyak menghalangi kontak langsung antara tarsus atau palpus pada permukaan daun, dan 3) senyawa volatil dari minyak bercampur dengan volatil tanaman di udara sehingga menurunkan probabilitas reseptor olfaktori menangkap sinyal penanda lokasi inang. Minyak mineral juga meningkatkan mortalitas, akibat dari penolakan makan pada daun jeruk yang diperlakukan. Pengaruh AMO lebih besar dari pada HMO

The message or the bottle? Community, associationism and adult learning as “part of the process of social change”

Raymond Williams argued that the “the impulse to adult education” was never solely focused on “remedying deficit, making up for inadequate educational resources in the wider society” (Williams, 1983, in McIlroy and Westwood (Eds), 1993, p. 257). Nor was it primarily a response to “meeting new needs of the society”. This chapter argues, as Williams did, that adult education has to be more than “the bottle with the message in it, bobbing on the tides and waves of history” (ibid, p. 255), springing urgently, instead, from the “the desire to make learning part of the process of social change itself (ibid, p. 257). Williams’ assertion suggests that Adult Education’s political purpose comes through the lens of community and associationism and their contribution to an ‘ethic of service’ and to social justice. Concepts such as ‘social mobility’ and ‘aspiration’ are politically freighted ideas which mask real knowledge dispossession and social precarity. This chapter explores the important role adult education can play in ‘left behind’ communities in the grip of decline, focusing on the role of residential colleges and also non-formal, family and community learning in engaging at community level with those who have no overt ‘voice’ in the political system. Finally, the chapter explores the role of adult education in consciousness raising and in the construction of ‘resources for a journey of hope’, examining how awareness of community history and labour struggles have provided continuity and resilience in times of escalating turbulence