Off-axis structures of spreading zones according to results of experimental modeling

Grokholsky, A. L.; Dubinin, E. P.; Kokhan, A. V.; Петрова, А. В.

doi:10.1134/s0016852114020034

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…Subsequently, on the basis of denuded strata comeback and de-compaction, the extension amount was determined according to the maximum thickness and fault distance of each stratum (Grokholsky, Dubinin, Kokhan, & Petrova, 2014). Controlling subsidence fault activity and stratum accepting sedimentation were thus simulated.…”

Section: Model Designmentioning

confidence: 99%

Structural characteristics and formation mechanisms of Bayanhushu Sag in Hailar Basin, north‐east China: A study based on structural physical simulation

Liu

Yang

et al. 2021

Geological Journal

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The Hailar Basin, located in north‐east China, is a typical continental rifted basin that contains oil and gas. The basin formation process comprised several stages of construction and reformation with complex formation mechanisms. The Bayanhushu (BYHS) Sag is a secondary structural unit in the south‐west Hailar Basin with a significant resource potential, but its current poor exploration and insufficient understanding of the structural evolution characteristics are restricting further oil and gas exploration. Therefore, the study of the structural evolution of the BYHS Sag plays a pivotal role in the future exploration and development of oil and gas. There are different hypotheses on the formation mechanisms and structural evolution of the BYHS Sag. To further understand the evolutionary history of the BYHS Sag, a structural physical simulation experiment was used based on the structural interpretation and geometric analysis of a seismic section. Inversion validation was then undertaken by the 2DMove equilibrium profile recovery technology. It was found that the formation process of the BYHS Sag was mainly controlled by the western Adunchulu Fault. Faults on the section developed in succession from top to bottom. The fault plane experienced multiple changes, thus forming a special seat‐shaped structural pattern. Structural inversion occurred twice during the evolution of the sag. The compressive stress during the tectonic inversion mainly acted in a SE direction. It is inferred that this was related to the subduction of the Palaeo‐Pacific Plate under the Eurasian Plate and the intermittent compression caused by the transmission of stress of the arc–continent collision.

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Section: Model Designmentioning

confidence: 99%

Structural characteristics and formation mechanisms of Bayanhushu Sag in Hailar Basin, north‐east China: A study based on structural physical simulation

Liu

Yang

et al. 2021

Geological Journal

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“…При этом в неотектоническом строении региона можно наглядно наблюдать структуры, находящиеся на разных стадиях развития рифтогенеза. Помимо кон тинентального рифтогенеза с помощью физического моделирования широко исследовались осевые зоны спрединговых хребтов [Shemenda, Grokholsky, 1994;Dauteuil et al, 2001;Grokholskii, Dubinin, 2006;Kokhan et al, 2012;Grokholsky et al, 2014;Dubinin et al, 2011Dubinin et al, , 2017, а также сдвиговые деформации в приуроченных к ним трансформных и нетрансформных смещениях [Shemenda, Grokholsky, 1991;Dauteuil et al, 2002;Mauduit, Dauteuil, 1996;Dauteuil, Mart, 1998;Tentler, 2003Tentler, , 2007Tentler, Acocella, 2010;Grokholskii, Dubinin, 2006Gerya, 2012;Dooley, Schreurs, 2012;Kokhan et al, 2012;Grokholsky et al, 2014;Dubinin et al, 2017].…”

Section: индийский океанunclassified

Specific features of structure formation during the development of the lithosphere of the Gulf of Aden (physical modeling)

Dubinin

Grokhol'skii

2020

Geodin. tektonofiz.

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The study was focused on the tectonic structure features of the Gulf of Aden, which includes three provinces. The western, central and eastern provinces differ in morphostructural segmentation of the spreading ridge of the Gulf of Aden, which took place in different geodynamic regimes of their formation and development. In our study, physical modeling was performed to investigate the segmentation mechanisms of the three parts and the formation of the marginal plateau and the island of Socotra. In experiments, an elastic-plastic plate lying on a liquid base (simulating melt) was subjected to normal or oblique stretchig. Plate sections imitating the continental or oceanic lithosphere in the model had different thicknesses. Various heterogeneities, such as cuts, linear weakened zones (rift heating zones) etc., were set in the plate sections in accordance with natural analogues. The modeling results show that morphostructural segmentation of the spreading axis in the Gulf of Aden depends on the degree of heating and the thickness of the lithosphere, associated with different distances from the Afar plume and local thermal anomalies, spreading obliquity and the existence of structural inhomogeneities with increased lithosphere strength, which are associated in this case with the presence of Mesozoic grabens on the pre-breakup basement. The smaller is the lithosphere thickness, the smaller is the size of the segments. The sharper is the angle, the more pronounced is segmentation. The study of the connection of the Gulf of Aden continental rift with the rift zone of the Carlsberg ridge suggests that during their development, these rift fractures propagated towards each other. The experiment results show that in case of a «sharp» boundary between blocks that differ in thickness, a shear zone is likely to occur. Such a case is applicable, for example, to the Alula-Fartak fracture zone, or to Owen's fracture zone. With a less 'sharp' boundary, overlapping structures are often formed, such as microplates or microblocks enclosed between two rift fissures. In such case, one microblock then dies, while the other develops into a spreading ridge. Apparently, such a microblock is represented by the marginal plateau and the island of Sokotra. As shown by the modeling, propagation of the two rifts towards each other was important for the formation of the plateau and the island of Socotra. Moreover, a significant role was played by the initial geometry of the rift zones and their initial positioning separate from each other.

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Physical Modeling of the Interaction of the Spreading Ridge with the Large Igneous Province of Kerguelen

Agranov

Dubinin

Grokholsky

2022

Moscow Univ. Geol. Bull.

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Off-axis structures of spreading zones according to results of experimental modeling

Cited by 4 publications

References 29 publications

Structural characteristics and formation mechanisms of Bayanhushu Sag in Hailar Basin, north‐east China: A study based on structural physical simulation

Structural characteristics and formation mechanisms of Bayanhushu Sag in Hailar Basin, north‐east China: A study based on structural physical simulation

Specific features of structure formation during the development of the lithosphere of the Gulf of Aden (physical modeling)

Physical Modeling of the Interaction of the Spreading Ridge with the Large Igneous Province of Kerguelen

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