Dennis Arne | James Cook University Brisbane (original) (raw)
Papers by Dennis Arne
Pillara is the largest of several known Mississippi Valley-type (MVT) deposits on the Lennard She... more Pillara is the largest of several known Mississippi Valley-type (MVT) deposits on the Lennard Shelf. Paleomagnetic data from 294 specimens from 23 sites in the mine have yielded a characteristic remanent magnetization (ChRM) direction of D= 20.6° , I= -27.5° (N= 23, alpha95 = 5.3° , k= 34.1). Thermal step demagnetization and isothermal remanence analyses show: 1) that the ChRM is carried mostly by single to pseudosingle domain pyrrhotite; and, 2) using artificial specimens of Zn and Pb concentrates and of tailings mixed with a ceramic matrix, that the pyrrhotite is carried by sphalerite and galena and not by the gangue minerals. The ChRM's pole position gives an age of 358±5 Ma, which agrees with previously published Rb-Sr sphalerite, U-Pb ore-stage calcite, and paleomagnetic ages for Lennard Shelf deposits. Separation of ore and barren wall rock ChRM directions, combined with a negative paleomagnetic breccia test on tectonic clasts, indicates that the faulting that created the...
The Sverdrup Basin is the largest sedimentary basin in the Canadian Arctic. Its sediments were de... more The Sverdrup Basin is the largest sedimentary basin in the Canadian Arctic. Its sediments were deposited in two sequences: Proterozoic to mid-Palaeozoic and late Palaeozoic to early Cenozoic, and affected by both the Ellesmerian and Eurekan orogenies. Detrital apatite samples have been obtained from two measured sections in the Northern Sawtooth Range. The first measured section transects the East Cape Thrust with Permian rocks in the hangingwall and Triassic to Miocene rocks in the footwall. The second measured section traverses up-section from the Permian rocks in the hangingwall of the East Cape Thrust into Triassic-Jurassic rocks. Together the two sections fonn a continuous lithological record from the Permian to the Miocene. The apatite samples are analyzed for fission track histories and compositional variation. The analyses of fission tracks in apatite grains yield information on burial, cooling and exhumation events in sedimentary rocks. By contrasting fission track cooling ...
ASEG Extended Abstracts, 2019
ASEG Extended Abstracts
At least four petrographically, geochemically, temporally and spatially distinct dolomites have b... more At least four petrographically, geochemically, temporally and spatially distinct dolomites have been identified in mid-late Devonian carbonate banks and reefal buildups of the Emanuel Range on the south eastern Lennard Shelf. Detailed mapping of the distinct dolomite bodies and their relationship to extensional faults and MVT-sulphide mineralisation has allowed the structural evolution of the southeastern Emanuel Range to be reconstructed providing constraints on the structural evolution of the range during oil migration and MVT mineralisation. The earliest dolomite (DI) is a stratigraphically-controlled, finely crystalline, non-ferroan, fabric mimetic syndepositional dolomite that is associated with evaporitic mudflats and predates major fault movement. Dolomite II (DII) is also stratigraphically controlled and is restricted to the basal section of the Argutastrea Unit which overlies the Lower Dolomite Unit. DII comprises fine to medium crystalline weakly ferroan replacement dolomite and cements which formed during early burial (<500m) when primary porosity was relatively high. Following extension-related major movement on the Cadjebut Fault during the Mid to Late Devonian, hot 60-106 ºC highly saline basinal brines entered the reefs precipitating a medium to coarsely crystalline, variably ferroan Dolomite III (DIII). DIII distribution indicates that brines utilised the Pinnacles and Cadjebut Splay Faults rather than the Cadjebut Fault. The onset of oil migration coincided with the later stages of DIII formation and the onset of MVT-sulphide mineralisation. Leaching of bioclasts associated with DII and DIII resulted in the development of variably abundant secondary mouldic and vuggy porosity which in some cases is maintained in the subsurface forming potential reservoir facies. The final generation of dolomite is coarsely crystalline, variably ferroan Dolomite (DIV), which can exhibit pronounced lattice curvature and is associated with MVT sulphides. Both Dolomites DIII and DIV are hydrothermal dolomites (HTD) having formed at temperatures up to 30ºC higher than maximum burial temperatures of the host sediments. Key words: Dolomite, Hydrothermal dolomite (HTD), Zn-Pb deposit, Mississippi Valley-type, Lennard Shelf.
Economic Geology, 1991
... DENNIS C. ARNE* Department of Geology, University of Melbourne, Parkville, Victoria 3052, Aus... more ... DENNIS C. ARNE* Department of Geology, University of Melbourne, Parkville, Victoria 3052, Australia Introduction On the basis of organic maturation studies, MacQueen and ... of ore formation lie in the range 50 ø to 100øC on the basis of fluid inclusion data (Roedder, 1968; Kyle ...
Aapg Bulletin, Mar 1, 1992
... general, good apatite yields were obtained from samples of Atoka Formation, as well as from t... more ... general, good apatite yields were obtained from samples of Atoka Formation, as well as from the Stanley Shale and the Womble Shale ... a well-thermalized neutron flux at the X-7 facility of the Australian Nuclear Science and Technology Organization's Hifar reactor, Lucas Heights ...
AAPG Bulletin, 1992
... general, good apatite yields were obtained from samples of Atoka Formation, as well as from t... more ... general, good apatite yields were obtained from samples of Atoka Formation, as well as from the Stanley Shale and the Womble Shale ... a well-thermalized neutron flux at the X-7 facility of the Australian Nuclear Science and Technology Organization's Hifar reactor, Lucas Heights ...
Http Dx Doi Org 10 1080 08120099408728141, May 9, 2007
ABSTRACT
The low-temperature (i.e.<~120°C) thermal history of the East Antarctic Shield has been assess... more The low-temperature (i.e.<~120°C) thermal history of the East Antarctic Shield has been assessed by apatite fission-track analysis of 42 Precambrian outcrop samples. The variability in the relationship between apatite fission track age and mean track length in data from various geographical regions suggests differences in styles of cooling during the Phanerozoic. Samples from the continental margin east of Prydz Bay are inferred to have cooled during the late Palaeozoic and early Mesozoic, between ~300 and 200 Ma, while samples from the Prince Charles Mountains and from the continental margin west of Prydz Bay are inferred to have cooled more recently in the Mesozoic at ~150 Ma. Evidence for cooling during the Mesozoic at ~150 Ma is attributed to exhumation associated with the early stages of Gondwana break-up. -from Authors
Pillara is the largest of several known Mississippi Valley-type (MVT) deposits on the Lennard She... more Pillara is the largest of several known Mississippi Valley-type (MVT) deposits on the Lennard Shelf. Paleomagnetic data from 294 specimens from 23 sites in the mine have yielded a characteristic remanent magnetization (ChRM) direction of D= 20.6° , I= -27.5° (N= 23, alpha95 = 5.3° , k= 34.1). Thermal step demagnetization and isothermal remanence analyses show: 1) that the ChRM is carried mostly by single to pseudosingle domain pyrrhotite; and, 2) using artificial specimens of Zn and Pb concentrates and of tailings mixed with a ceramic matrix, that the pyrrhotite is carried by sphalerite and galena and not by the gangue minerals. The ChRM's pole position gives an age of 358±5 Ma, which agrees with previously published Rb-Sr sphalerite, U-Pb ore-stage calcite, and paleomagnetic ages for Lennard Shelf deposits. Separation of ore and barren wall rock ChRM directions, combined with a negative paleomagnetic breccia test on tectonic clasts, indicates that the faulting that created the ...
Nuclear Tracks and Radiation Measurements, 1993
Petroleum Geoscience, 1996
ABSTRACT
Ore Geology Reviews, 1998
... Turbidite-hosted gold deposits of Central Victoria, Australia: their regional setting, minera... more ... Turbidite-hosted gold deposits of Central Victoria, Australia: their regional setting, mineralising styles, and some genetic constraints. ... 3353, Australia. b Geological Survey of Victoria, PO Box 2145 MDC, Fitzroy, Vic. 3065, Australia. Received 1 January 1997. ...
Ore Geology Reviews, 1998
The study of wallrock alteration phenomena around slate belt-hosted gold deposits can provide val... more The study of wallrock alteration phenomena around slate belt-hosted gold deposits can provide valuable information regarding the physico-chemical conditions of the ore-bearing fluids and the timing relationships between deformation, peak metamorphism, granitoid ...
Pillara is the largest of several known Mississippi Valley-type (MVT) deposits on the Lennard She... more Pillara is the largest of several known Mississippi Valley-type (MVT) deposits on the Lennard Shelf. Paleomagnetic data from 294 specimens from 23 sites in the mine have yielded a characteristic remanent magnetization (ChRM) direction of D= 20.6° , I= -27.5° (N= 23, alpha95 = 5.3° , k= 34.1). Thermal step demagnetization and isothermal remanence analyses show: 1) that the ChRM is carried mostly by single to pseudosingle domain pyrrhotite; and, 2) using artificial specimens of Zn and Pb concentrates and of tailings mixed with a ceramic matrix, that the pyrrhotite is carried by sphalerite and galena and not by the gangue minerals. The ChRM's pole position gives an age of 358±5 Ma, which agrees with previously published Rb-Sr sphalerite, U-Pb ore-stage calcite, and paleomagnetic ages for Lennard Shelf deposits. Separation of ore and barren wall rock ChRM directions, combined with a negative paleomagnetic breccia test on tectonic clasts, indicates that the faulting that created the...
The Sverdrup Basin is the largest sedimentary basin in the Canadian Arctic. Its sediments were de... more The Sverdrup Basin is the largest sedimentary basin in the Canadian Arctic. Its sediments were deposited in two sequences: Proterozoic to mid-Palaeozoic and late Palaeozoic to early Cenozoic, and affected by both the Ellesmerian and Eurekan orogenies. Detrital apatite samples have been obtained from two measured sections in the Northern Sawtooth Range. The first measured section transects the East Cape Thrust with Permian rocks in the hangingwall and Triassic to Miocene rocks in the footwall. The second measured section traverses up-section from the Permian rocks in the hangingwall of the East Cape Thrust into Triassic-Jurassic rocks. Together the two sections fonn a continuous lithological record from the Permian to the Miocene. The apatite samples are analyzed for fission track histories and compositional variation. The analyses of fission tracks in apatite grains yield information on burial, cooling and exhumation events in sedimentary rocks. By contrasting fission track cooling ...
ASEG Extended Abstracts, 2019
ASEG Extended Abstracts
At least four petrographically, geochemically, temporally and spatially distinct dolomites have b... more At least four petrographically, geochemically, temporally and spatially distinct dolomites have been identified in mid-late Devonian carbonate banks and reefal buildups of the Emanuel Range on the south eastern Lennard Shelf. Detailed mapping of the distinct dolomite bodies and their relationship to extensional faults and MVT-sulphide mineralisation has allowed the structural evolution of the southeastern Emanuel Range to be reconstructed providing constraints on the structural evolution of the range during oil migration and MVT mineralisation. The earliest dolomite (DI) is a stratigraphically-controlled, finely crystalline, non-ferroan, fabric mimetic syndepositional dolomite that is associated with evaporitic mudflats and predates major fault movement. Dolomite II (DII) is also stratigraphically controlled and is restricted to the basal section of the Argutastrea Unit which overlies the Lower Dolomite Unit. DII comprises fine to medium crystalline weakly ferroan replacement dolomite and cements which formed during early burial (<500m) when primary porosity was relatively high. Following extension-related major movement on the Cadjebut Fault during the Mid to Late Devonian, hot 60-106 ºC highly saline basinal brines entered the reefs precipitating a medium to coarsely crystalline, variably ferroan Dolomite III (DIII). DIII distribution indicates that brines utilised the Pinnacles and Cadjebut Splay Faults rather than the Cadjebut Fault. The onset of oil migration coincided with the later stages of DIII formation and the onset of MVT-sulphide mineralisation. Leaching of bioclasts associated with DII and DIII resulted in the development of variably abundant secondary mouldic and vuggy porosity which in some cases is maintained in the subsurface forming potential reservoir facies. The final generation of dolomite is coarsely crystalline, variably ferroan Dolomite (DIV), which can exhibit pronounced lattice curvature and is associated with MVT sulphides. Both Dolomites DIII and DIV are hydrothermal dolomites (HTD) having formed at temperatures up to 30ºC higher than maximum burial temperatures of the host sediments. Key words: Dolomite, Hydrothermal dolomite (HTD), Zn-Pb deposit, Mississippi Valley-type, Lennard Shelf.
Economic Geology, 1991
... DENNIS C. ARNE* Department of Geology, University of Melbourne, Parkville, Victoria 3052, Aus... more ... DENNIS C. ARNE* Department of Geology, University of Melbourne, Parkville, Victoria 3052, Australia Introduction On the basis of organic maturation studies, MacQueen and ... of ore formation lie in the range 50 ø to 100øC on the basis of fluid inclusion data (Roedder, 1968; Kyle ...
Aapg Bulletin, Mar 1, 1992
... general, good apatite yields were obtained from samples of Atoka Formation, as well as from t... more ... general, good apatite yields were obtained from samples of Atoka Formation, as well as from the Stanley Shale and the Womble Shale ... a well-thermalized neutron flux at the X-7 facility of the Australian Nuclear Science and Technology Organization's Hifar reactor, Lucas Heights ...
AAPG Bulletin, 1992
... general, good apatite yields were obtained from samples of Atoka Formation, as well as from t... more ... general, good apatite yields were obtained from samples of Atoka Formation, as well as from the Stanley Shale and the Womble Shale ... a well-thermalized neutron flux at the X-7 facility of the Australian Nuclear Science and Technology Organization's Hifar reactor, Lucas Heights ...
Http Dx Doi Org 10 1080 08120099408728141, May 9, 2007
ABSTRACT
The low-temperature (i.e.<~120°C) thermal history of the East Antarctic Shield has been assess... more The low-temperature (i.e.<~120°C) thermal history of the East Antarctic Shield has been assessed by apatite fission-track analysis of 42 Precambrian outcrop samples. The variability in the relationship between apatite fission track age and mean track length in data from various geographical regions suggests differences in styles of cooling during the Phanerozoic. Samples from the continental margin east of Prydz Bay are inferred to have cooled during the late Palaeozoic and early Mesozoic, between ~300 and 200 Ma, while samples from the Prince Charles Mountains and from the continental margin west of Prydz Bay are inferred to have cooled more recently in the Mesozoic at ~150 Ma. Evidence for cooling during the Mesozoic at ~150 Ma is attributed to exhumation associated with the early stages of Gondwana break-up. -from Authors
Pillara is the largest of several known Mississippi Valley-type (MVT) deposits on the Lennard She... more Pillara is the largest of several known Mississippi Valley-type (MVT) deposits on the Lennard Shelf. Paleomagnetic data from 294 specimens from 23 sites in the mine have yielded a characteristic remanent magnetization (ChRM) direction of D= 20.6° , I= -27.5° (N= 23, alpha95 = 5.3° , k= 34.1). Thermal step demagnetization and isothermal remanence analyses show: 1) that the ChRM is carried mostly by single to pseudosingle domain pyrrhotite; and, 2) using artificial specimens of Zn and Pb concentrates and of tailings mixed with a ceramic matrix, that the pyrrhotite is carried by sphalerite and galena and not by the gangue minerals. The ChRM's pole position gives an age of 358±5 Ma, which agrees with previously published Rb-Sr sphalerite, U-Pb ore-stage calcite, and paleomagnetic ages for Lennard Shelf deposits. Separation of ore and barren wall rock ChRM directions, combined with a negative paleomagnetic breccia test on tectonic clasts, indicates that the faulting that created the ...
Nuclear Tracks and Radiation Measurements, 1993
Petroleum Geoscience, 1996
ABSTRACT
Ore Geology Reviews, 1998
... Turbidite-hosted gold deposits of Central Victoria, Australia: their regional setting, minera... more ... Turbidite-hosted gold deposits of Central Victoria, Australia: their regional setting, mineralising styles, and some genetic constraints. ... 3353, Australia. b Geological Survey of Victoria, PO Box 2145 MDC, Fitzroy, Vic. 3065, Australia. Received 1 January 1997. ...
Ore Geology Reviews, 1998
The study of wallrock alteration phenomena around slate belt-hosted gold deposits can provide val... more The study of wallrock alteration phenomena around slate belt-hosted gold deposits can provide valuable information regarding the physico-chemical conditions of the ore-bearing fluids and the timing relationships between deformation, peak metamorphism, granitoid ...