Basin ResearchPub Date : 2026-04-24DOI: 10.1111/bre.70106
Francyne Bochi do Amarante, Shahin E. Dashtgard, Maziyar Nazemi, Andrew J. Calvert, H. Daniel Gibson
{"title":"Seismic Stratigraphy and Tectonic Evolution of the Forearc Georgia Basin (Upper Cretaceous–Miocene), Canada and USA, With Implications for CO2 Sequestration","authors":"Francyne Bochi do Amarante, Shahin E. Dashtgard, Maziyar Nazemi, Andrew J. Calvert, H. Daniel Gibson","doi":"10.1111/bre.70106","DOIUrl":"https://doi.org/10.1111/bre.70106","url":null,"abstract":"The Georgia Basin in southwest Canada and northwest USA is a Late Cretaceous to Cenozoic forearc basin that transitioned into a forearc depression in the Eocene following uplift of the forearc high (Vancouver Island). Both the tectonostratigraphic transition of the Georgia Basin from a conventional forearc basin to a forearc depression and the CO<sub>2</sub> sequestration potential in the basin overall remain poorly understood due to limited subsurface data and complex tectonic histories. This study uses 2D seismic and well data to reconstruct the subsurface architecture of the Whatcom Sub-Basin, which is the southeastern depocenter of the Georgia Basin. The Whatcom Sub-Basin exhibits a wedge-shaped geometry and thickens to the south and west; the thickest strata exceed 7000 m and are located east of the Outer Island Fault and below the Strait of Georgia. Basin architecture is shaped by NE-SW and NW-SE normal faults, including the Outer Island Fault which exhibits 5.9 km of vertical displacement. Four key tectono-stratigraphic units are identified: the lower and upper Nanaimo Group, Huntingdon Formation, and Boundary Bay Formation. These units document episodes of erosion and tectonic reorganization and are separated by basin-margin disconformities that transition to correlative conformities with localized erosion toward the basin center. The Upper Cretaceous Nanaimo Group (both lower and upper) records the initial phase of deposition within a forearc basin and its thickness is controlled by faults and underlying structural highs and lows of the Coast Plutonic Complex. In contrast, the overlying Huntingdon and Boundary Bay formations display more tabular geometries that were deposited in a forearc depression. Both fault density and throw decrease upsection and record the shift to relative tectonic quiescence in the Cenozoic. An eastward reduction in deformation demonstrates asymmetric strain distribution. The evolutionary pathway of the Georgia Basin makes it an exceptional example of forearc depression development, and the architecture of strata therein suggests there is significant potential for CO<sub>2</sub> storage. Specifically, the broad extents, consistent thickness and limited faulting of the Huntingdon and Boundary Bay formations suggest both intervals are favourable targets for CO<sub>2</sub> storage. Future high-magnitude earthquakes may reactivate faults that crosscut the sedimentary fill; however, CO<sub>2</sub> leakage risk may be reduced through mineral trapping and by injecting CO<sub>2</sub>-water solutions in areas where faulting is minimal. By linking tectonic events to stratigraphic architecture, this study not only provides new insights into the multi-phase evolution of the convergent-margin Georgia Basin, from forearc basin to forearc depression, but also demonstrates how such systems can provide favourable geological conditions for carbon sequestration.","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"41 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147739619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Detachment and Accretion‐Related Syn‐Rift Seaward Dipping Sequences in the NW South China Sea","authors":"Peng Chao, Gianreto Manatschal, Pauline Chenin, Jianye Ren","doi":"10.1111/bre.70103","DOIUrl":"https://doi.org/10.1111/bre.70103","url":null,"abstract":"Seaward‐dipping sequences (SDS) are typically observed in sediment‐driven progradation of slope deposits in post‐rift sequences, or along magma‐rich rifted margins, where they are primarily formed by subaerial lava flows and referred to as seaward dipping reflections (SDRs). However, new seismic reflection data from the sediment‐rich northwestern South China Sea (NW‐SCS) reveal the existence of SDS in sediment‐rich syn‐rift sequences, here referred to as syn‐rift sedimentary SDS. Based on a detailed tectono‐stratigraphic analysis, we describe how these syn‐rift sedimentary SDS differ from magmatic SDRs and propose a conceptual model for their formation. We show that the formation of these sequences is most likely controlled by a combination of high sediment supply rates, rapid subsidence and creation of horizontal accommodation space, first along large‐offset detachment faults and later, during breakup, by magmatic accretion. While inner magmatic SDRs typically form in subaerial conditions above continent‐dipping faults, we suggest that syn‐rift sedimentary SDS can derive from turbiditic flows in a relatively deep‐water environment above oceanward‐dipping detachment faults and/or interfinger with magmatic additions. Finally, we discuss the implications of syn‐rift sedimentary SDS for the interpretation of rifted margins in general.","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"66 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147696142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Basin ResearchPub Date : 2026-04-01DOI: 10.1111/bre.70100
Shuyue Zhu, Lei Liu, Kang Chen, Guangguang Yang, Xinyu Yan, Chao Zheng, Lei Zhao, Hongde Chen, Nachuan Song, Zexin Du
{"title":"The Change From a Marine to a Continental Setting in the Late Triassic of the Western Yangtze Craton: Constraints From the Sedimentary Record and Paleogeographic Significance","authors":"Shuyue Zhu, Lei Liu, Kang Chen, Guangguang Yang, Xinyu Yan, Chao Zheng, Lei Zhao, Hongde Chen, Nachuan Song, Zexin Du","doi":"10.1111/bre.70100","DOIUrl":"10.1111/bre.70100","url":null,"abstract":"<div>\u0000 \u0000 <p>In the Late Triassic, the western Yangtze Craton was located within the oblique subduction and collision setting of the South and North China Blocks as the Paleo-Tethys Ocean retreated westward. The Upper Triassic Xujiahe Formation constitutes well-preserved sedimentary records from the marine–continental transition. However, there are spatiotemporal discrepancies in provenance, and the timing of the marine–continental transition remains vague, thereby restricting our understanding of the tectonosedimentary history of the craton. Based on field and core observations, lithic assemblages, detrital zircon U–Pb ages, gravel composition and seismic data, six major provenance areas are identified: the Songpan-Ganzi Terrane, the Longmenshan Thrust Belt, the South Qinling Orogenic Belt, the Micang-Dabashan Thrust Belt, the Jiangnan-Xuefeng Thrust Belt and the old crust of the Kangdian region. Marine sediments deposited during the early formation of the Longmenshan Foreland Basin were sourced from the South Qinling Orogenic Belt and were primarily deposited as distal braided-river deltas. During later development of the Longmenshan Foreland Basin, the northern and central Longmenshan Thrust Belt was uplifted and formed fan deltas in northwestern Sichuan. Distal braided-river deltas in the northeast originated from the South Qinling Orogenic Belt. During the Dabashan Uplift period, the Longmenshan Thrust Belt had been fully uplifted, the sea completely receded, and terrestrial lacustrine basin deposits developed. The uplift of the South Qinling Orogenic Belt forced the Micang-Dabashan Thrust Belt into a thrust–nappe phase that produced braided-river delta deposits. This spatiotemporal basin–orogen coupling highlights the importance of using lithology, stratigraphy and sedimentary facies characteristics to reconstruct the closure of the Paleo-Tethys Ocean and the Late Triassic tectonic-sedimentary evolution of East Asia tectonic domain, and offers a framework for interpreting similar geologic settings.</p>\u0000 </div>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"38 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147586609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Basin ResearchPub Date : 2026-04-01DOI: 10.1111/bre.70101
David L. de Castro, Diógenes C. Oliveira, Germano Melo Jr, Gilsijane V. Ramos, Alanny C. C. Melo, Sidnei P. Rostirolla
{"title":"Role of Complex Crustal and Basinal Structures in Onset of an Intracratonic Rift System: An Example From the Onshore Potiguar Basin, Brazilian Equatorial Margin","authors":"David L. de Castro, Diógenes C. Oliveira, Germano Melo Jr, Gilsijane V. Ramos, Alanny C. C. Melo, Sidnei P. Rostirolla","doi":"10.1111/bre.70101","DOIUrl":"10.1111/bre.70101","url":null,"abstract":"<p>This study promotes a comprehensive geophysical mapping of the Potiguar Basin Precambrian basement with unprecedented detail, using thermomechanical analysis of the lithosphere, advanced anomaly enhancement techniques, an unsupervised semi-automatic mapping method (SOM) and 2D/3D joint magnetic-gravity modelling constrained by seismic and well data. This Early Cretaceous multiphase marginal basin, located at the northeastern end of the Brazilian transform margin of the Equatorial Atlantic, conceals in its onshore portion an aborted rift overlain by thin post-rift deposition. The combined analysis of Curie-Point Depth, Effective Elastic Thickness and Moho relief reveals six distinct crustal domains, providing a refined understanding of the lithospheric structure and its response to the plate-driven motion that caused the crustal thinning and rifting. Analysis of magnetic and gravity patterns, lineaments and SOM populations integrated with magnetic susceptibility-density models and key geophysical transects over the study area demonstrates the complex Precambrian basement grain dominated by intensively deformed shear zones and sets of grabens and horsts within the rifted zone. Our results highlight that the Potiguar Rift intricate internal architecture preserves evidence of the strong structural control exerted by the pre-existing structural framework on the nucleation and evolution of this intracratonic rift, and its subsequent abandonment. This geological setting emphasizes the Potiguar Basin as a key case study of tectonic inheritance role at the lithospheric, continental, basinal, and fault-scales.</p>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"38 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bre.70101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147586610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Basin ResearchPub Date : 2026-03-25DOI: 10.1111/bre.70097
Deron Saul, Uisdean Nicholson
{"title":"Tectonostratigraphic Evolution of the Guyana Basin: Implications for Sediment Routing and Slope Stability","authors":"Deron Saul, Uisdean Nicholson","doi":"10.1111/bre.70097","DOIUrl":"10.1111/bre.70097","url":null,"abstract":"<p>The Guyana Basin developed in an evolving tectonic setting, but a lack of subsurface data has limited understanding of its tectonic and sedimentary evolution through time. This study uses extensive, newly available 2D seismic reflection and exploration well data to develop a regional tectonostratigraphic framework, to reconstruct sediment accumulation and constrain sediment routing to the basin through time. Five megasequences (MS-0 to MS-4; oldest to youngest) are defined, each representing a distinct phase of basin fill. MS-0 corresponds to the pre- and syn-rift phases of the Central Atlantic rift, marked by folded volcano-sedimentary units. MS-1 (Middle Jurassic–Aptian) represents the post-rift phase of the Central Atlantic, characterised by low sedimentation rates and isolated depocenters likely fed by nearby continental sources from the Guyana margin, and possibly adjacent conjugate margins in North America and Africa. MS-2 (Aptian–Albian) represents the Equatorial Atlantic syn-rift and transform phase, marked by the development of the Equatorial Atlantic Fracture Zone (EAFZ) and the emergence of a southeastern slope depocenter. MS-3 (Albian–Middle Miocene) corresponds to the Equatorial Atlantic passive margin phase of the basin, with sediment transported through large canyon systems, likely indicating increased riverine flux from the Guyana margin. MS-4 (Upper Miocene–Recent) reflects ongoing passive margin sedimentation and the development of a fold-and-thrust belt in the northwestern basin due to the collision between the Caribbean and South American plates. About 41% of the total sediments of the Guyana Basin were deposited in the last ~11.6 Myr, driven by a ~40 MTa<sup>−1</sup> sediment flux primarily from the Amazon River–Guiana Current system. This order of magnitude increase in sedimentation rate in the Miocene corresponds with the onset of widespread mass transport deposits, indicating that rapid sedimentation and disequilibrium compaction preconditioned the continental slope for repeated failure. This has important implications for slope stability, with large-volume submarine landslides forming a potentially significant landslide and tsunami hazard for subsea infrastructure and coastal populations.</p>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"38 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bre.70097","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147507222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}