The stretching amplitude and thermal regime of the lithosphere in the nonvolcanic passive margin of Antarctica in the Mawson Sea region

Galushkin, Yu. I.; Leitchenkov, G. L.; Guseva, Yu. B.; Dubinin, E. P.

doi:10.1134/s106935131801007x

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…4 in Galushkin et al (2018) shows that the change in the onset of sediment deposition and ocean formation by 20 Ma in fact has little effect on the simulation results. The magnitudes of lithospheric stretching during sedimentation (β sed ) and during the pre-sedimentation phase (β 0 mod ) in Table 3 differ from β sed = β 1 × β 2 and β 0 in Table 2 of Galushkin et al (2018) by no more than 3%. The thermal histories of the lithosphere are also identical except for the starting time of lithospheric cooling (compare Fig.…”

Section: Discussionmentioning

confidence: 94%

“…Note here that comparing the results of this modelling with those of Galushkin et al (2018) makes it possible to assess the effects of the uncertainty in the starting time of sediment deposition (t sed ) and the age of the rifting on estimates of the thermal history and stretching of the lithosphere. In Galushkin et al (2018), deposition in the Mawson Sea Basin began 140 Ma ago, which is 20 million years later than in the present model. Comparison of Table 3 and Fig.…”

Section: Discussionmentioning

confidence: 99%

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Numerical Modelling of the Australia – Antarctica Conjugate Margins Using the Galo System: Part 2. Thermal and Maturation History of the Mawson Sea Basin, East Antarctica

Galushkin

Leitchenkov

Dubinin

2020

Journal of Petroleum Geology

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The thermal evolution of the Mawson Sea Basin, offshore East Antarctic, was modelled using the GALO basin modelling programme. As there exist no deep temperature or vitrinite reflectance data for the Mawson Sea Basin, the simulation was based on a limited nonthermal database. This includes the present‐day sedimentary section along a multichannel seismic profile which crosses the western part of the Mawson Sea along with geophysical assessments of the depth of the Moho. An analysis of the variations in tectonic subsidence was used to estimate the duration and magnitude of thermal activation or stretching of the lithosphere. This analysis suggested that a proportion of the lithospheric stretching took place before the start of synrift sediment deposition at about 160 Ma (Late Jurassic). This pre‐sedimentation lithospheric stretching has been ignored in previous studies, resulting in significant underestimation of the total stretching which has occurred. The analysis also suggests that the thermal maturity of Lower Jurassic potential source rocks along the profile may reach and even exceed the onset of the oil generation window, whereas source rocks in less deeply buried parts of the profile are less mature. In general, the results of the modelling indicate that the Mawson Sea Basin is a promising area for future oil and gas exploration.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Numerical Modelling of the Australia – Antarctica Conjugate Margins Using the Galo System: Part 2. Thermal and Maturation History of the Mawson Sea Basin, East Antarctica

Galushkin

Leitchenkov

Dubinin

2020

Journal of Petroleum Geology

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Numerical Modelling of the Australia – Antarctica Conjugate Margins Using the Galo System: Part 1. The Bremer Sub‐basin, Sw Australia

Galushkin

Leitchenkov

Dubinin

2020

Journal of Petroleum Geology

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An analysis of variations in the tectonic subsidence of the Bremer sub‐basin (offshore SW Australia) since 160 Ma using the GALO numerical basin modelling programme has made it possible both to refine previous models and to estimate the intensity of stretching and thermal activation of the lithosphere. The new model explains the rapid subsidence of the sub‐basin and the deposition of the synrift Bremer 1 unit during the initial rift phase in the Late Jurassic (160 to 130 Ma). This phase of extension was accompanied by high heat flows, typical of the axial zones of continental rifts, and lithospheric stretching with a β‐factor of about 1.4. Between 130 and 43 Ma, the abnormally low depositional rate and the shallow water depths suggest moderate thermal activation of the mantle and the absence of extension‐driven subsidence. However during the Eocene (43 to 37 Ma), the modelling suggests that another phase of intense stretching of the sub‐basin lithosphere took place with β = 1.7, explaining both the subsidence and an abrupt increase in water depth from about 50–200 m to nearer 2000 m.The high heat flows during the initial stage of rifting and thermal activation during Cenozoic extension contributed to the early generation of hydrocarbons by source rocks in the Bremer 1 unit at the base of sedimentary cover. At the present day, these source rocks are overmature. At the same time, the modelling suggests that generation of light and heavy oil in the overlying Bremer 2 and 3 units has occurred. Source rock intervals in the upper half of the Bremer 3 unit and in the overlying successions are early mature or immature and may have generated minor volumes of hydrocarbons.

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Hydrocarbon Generation by the Rocks of the Bremer Formation in Adjacent Areas of the Nonvolcanic Passive Margins of Australia and Antarctica

2018

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The stretching amplitude and thermal regime of the lithosphere in the nonvolcanic passive margin of Antarctica in the Mawson Sea region

Cited by 5 publications

References 11 publications

Numerical Modelling of the Australia – Antarctica Conjugate Margins Using the Galo System: Part 2. Thermal and Maturation History of the Mawson Sea Basin, East Antarctica

Numerical Modelling of the Australia – Antarctica Conjugate Margins Using the Galo System: Part 2. Thermal and Maturation History of the Mawson Sea Basin, East Antarctica

Numerical Modelling of the Australia – Antarctica Conjugate Margins Using the Galo System: Part 1. The Bremer Sub‐basin, Sw Australia

Hydrocarbon Generation by the Rocks of the Bremer Formation in Adjacent Areas of the Nonvolcanic Passive Margins of Australia and Antarctica

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