A rift‐scale view at strain partitioning during multiphase rifting: Insights from the Hailar Basin, northeast Asia

Wu, Lulu; Shen, Chuanbo; Paton, Douglas; Hou, Yanping; Mortimer, Estelle; Mei, Lianfu; Sun, Rongyao; Zeng, Xiaowei; Shi, Guanglu

doi:10.1111/bre.12757

Cited by 2 publications

(17 citation statements)

References 95 publications

(180 reference statements)

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“…The second phase rifting during the Berriasian to Barremian (including Tongbomiao Stage and Nantun Stage) became more intense and widespread across the whole rift due to the large-scale rollback of the Paleo-Pacific slab (Figure 2a; Song et al, 2019;Wu et al, 2023). Strain localization took place during the third rift phase (including Damoguaihe Stage and Yimin Stage) and then thermally controlled subsidence dominated, representing the eventual cessation of rifting (Wu et al, 2023). Wu et al (2023) also suggested that a slight change in the predominant fault strike and a series of minor emergent N-S-trending faults suggest that regional/local stress field may have varied during the third rift phase.…”

Section: Highlightsmentioning

confidence: 99%

“…Using interval velocities of 5000-6000 m/s for pre-rift basement (including pre-rift strata and crystalline basement), we determine a vertical seismic resolution of ca. 40-50 m. Four key seismic horizons (T5, T4, T22 and T04; Figure 2a; Liu, 2014) and associated controlling faults have been outlined in Wu et al (2023) and are used to generate time-thickness maps to examine the evolution of the syn-depositional fault activity and depocentre during multiphase rifting. The dip angles of major rift-related faults shown on selected seismic profiles were measured on time domain and then calculated through time-depth conversion.…”

Section: Interpretation Of Basement Structuresmentioning

confidence: 99%

“…The dip angles of major rift-related faults shown on selected seismic profiles were measured on time domain and then calculated through time-depth conversion. The conversion formula is Depth (m) = 0.000389 * t 2 + 0.721 * t (t, time in millisecond) based on Wu et al (2023), with an error of ca. 8%.…”

Section: Interpretation Of Basement Structuresmentioning

confidence: 99%

“…8%. Fault activity was qualitatively estimated by observing across-fault thickening of growth strata and the quantitative slip rates of rift-related faults during each rift phase are from Wu et al (2023). Slight vertical exaggeration (ca.…”

Section: Interpretation Of Basement Structuresmentioning

confidence: 99%

“…Time-thickness (a1, b1 and c1) and structural maps (a2, b2 and c2) showing the development of rift segments during multiphase extension, along with faults slip rates (a3, b3 and c3). The data of faults slip rates are fromWu et al (2023). Contour interval is 300 ms.…”

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confidence: 99%

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Rift segmentation caused by reactivation of multiple basement structure systems: Evidence from the Hailar‐Tamtsag Rift, northeast Asia

Wu,

Shen,

Paton

et al. 2024

Basin Research

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Since the influence of structural inheritance on rift geometry has been widely documented, it is easy to assume that rift segmentation, a prominent feature of rift geometry, may have been also influenced by structural heterogeneity. However, limited studies using high‐quality seismic data have considered how basement reactivation is accommodated at individual fault scale and then how this results in rift segmentation at sub‐basin scale. Using extensive high‐quality 3D seismic data and 76 borehole data, we investigate the characteristics of rift architecture, rift‐related fault systems, basement structures and rift evolution in the Hailar‐Tamtsag Rift, northeast Asia. We identify three distinct rift segments which are defined by three rift‐related fault systems and accompanied by three underlying basement structure systems. We recognize three phases of basement reactivation and three types (including five styles) of interactions between basement structures and rift‐related faults. Our study shows that rift segmentation has been caused by reactivation of multiple basement structure systems which not only influence the orientation of rift segments and type of rift architecture, but also control the location, strike, dip and style of the major rift‐related faults. Rift segmentation was completely achieved through multiple phases of basement reactivation, while the main structural framework of segmentation was established through ‘extensive reactivation’ during the second phase extension. Our study examines how multiple basement structure systems control rift segmentation at both individual fault and sub‐basin scales, which can significantly improve our understanding of relationship between structural inheritance and rift segmentation.

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