Marine and Petroleum Geology最新文献

{"title":"Fracturing in basinal siliciclastic deposits of the Wolfcampian Alta Formation, Marfa Basin, west Texas","authors":"David A. Ferrill ,&nbsp;Kevin J. Smart ,&nbsp;Adam J. Cawood ,&nbsp;Daniel J. Lehrmann ,&nbsp;Giovanni Zanoni ,&nbsp;R. Ryan King","doi":"10.1016/j.marpetgeo.2025.107391","DOIUrl":"10.1016/j.marpetgeo.2025.107391","url":null,"abstract":"<div><div>The Wolfcampian Alta Formation represents 1700 m of deep-water siliciclastic deposits exposed in the Marfa Basin, the southwestern sub-basin of the Permian Basin complex of west Texas. These exposures are important outcrop analogs for the highly productive Wolfcamp Shale oil and gas reservoir of the Delaware and Midland Basins because they are of similar age, lithologies, and depositional environments. We present preliminary field data from outcrops of the Alta Formation in the southeast part of the Chinati Mountains, including lithostratigraphy, fracture characterization, and mineralogical analyses. Mesostructural deformation fabrics are dominated by up to four systematic sets of bed-perpendicular opening- mode fractures but also include rare bed-parallel opening-mode veins (beef), and occasional normal faults and thrust faults. Opening-mode fractures are generally bed-restricted and are interpreted to record a complex history reflecting changing extension direction at the time of fracturing in these sandstone and shale strata. Fracture dimensions mapped in a sandstone bedding pavement exposure show that length (parallel to bedding) to height (perpendicular to bedding) ratios for opening-mode fractures range from 0.13 to 38.56, with an average aspect ratio for all mapped opening-mode fractures of 4.84. Scanline surveys of a systematic NE-striking opening-mode fracture set show that fracture spacing is strongly correlated with mineralogy in both sandstone and shale lithologies, with a strong positive correlation for fracture spacing vs. clay content, and very strong negative correlations for fracture spacing vs. quartz, quartz + feldspar, and brittleness index. Bed thickness vs. fracture spacing data from scanlines show marked differences between sandstone and shale beds, with a very strong positive correlation for sandstone beds, a weak negative correlation for shale beds, and a very weak positive correlation – i.e. no correlation – for combined data. These results suggest that composition exerts a first-order control on opening-mode fracture abundance, and that bed thickness is likely a subordinate, or less important, controlling factor. These relationships can potentially be leveraged for mineralogy-based subsurface fracture prediction in comparable siliciclastic deposits.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107391"},"PeriodicalIF":3.7,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740011","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}

{"title":"Changes in lake sedimentary environment and characteristics of organic matter enrichment under the influence of geological events: The lower Jurassic (Sinemurian-Toarcian) organic-rich shale, Sichuan Basin, Upper Yangtze Plate","authors":"Jiahao Kang ,&nbsp;Xingzhi Wang ,&nbsp;Fei Huo ,&nbsp;Deming Zeng ,&nbsp;Yue Li ,&nbsp;Zisang Huang ,&nbsp;Yiqing Zhu ,&nbsp;Bo Li ,&nbsp;Shengyang Xie ,&nbsp;Yuran Yang ,&nbsp;Yiming Yang","doi":"10.1016/j.marpetgeo.2025.107390","DOIUrl":"10.1016/j.marpetgeo.2025.107390","url":null,"abstract":"<div><div>Two sets of lacustrine organic-rich shale formations (Dongyuemiao and Da'anzhai members) have been developed in the Lower Jurassic (Sinemurian-Toarcian) in the Sichuan Basin of the Upper Yangtze Plate. The two strata have terrestrial sedimentary records of the Sinemurian-Pliensbachian boundary event (SPBE) and the Toarcian Oceanic Anoxic event (T-OAE). Based on the petrological and geochemical data, the paleoenvironment of lakes during the Dongyuemiao and Da'anzhai periods was reconstructed, and the organic matter enrichment characteristics under the influence of two geological events (SPBE and T-OAE) were systematically explored. From our analysis, it was indicated that two volcanic activities (the Central Atlantic Magmatic Province (CAMP) and Karoo Ferrar Large Igneous Province) triggered global geological events (SPBE and T-OAE) and global marine transgression during the Early Jurassic. As a result, the climate in the Sichuan Basin shifted towards dryness in the short term. During the middle of the Sinemurian period (Dong2 period), the Sichuan Basin was a freshwater lake formed under a warm-humid climate. The biological productivity of lakes is high, in terms of terrestrial debris input, and has an oxic bottom water environment. Under the influence of climate, higher biological productivity is the key to controlling the enrichment of organic matter. During the late Sinemurian period (Dong1 period), the greenhouse gas emissions from the Central Atlantic Magmatic Province (CAMP) caused the transformation of the climate in the Sichuan Basin into semi-dry to semi-humid. These changes induced a marine transgression in the eastern part of the basin. However, the impact of marine transgression on the enrichment of organic matter was limited, and the enrichment of organic matter still depends on biological productivity. During the Toarcian period (Da'anzhai period), the continuous eruption of the Karoo Ferrar Large Igneous Province caused the climate of the basin to transform into semi-dry during the maximum flooding period. This effect may have triggered the entire basin's marine transgression. High salinity, deeper bottom water, and dyoxic environments greatly promote the preservation of organic matter.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107390"},"PeriodicalIF":3.7,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681241","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":"Campanian-Maastrichtian evolution of sedimentary systems during the final stages of an epeiric sea —La Luna Sea— in eastern Colombia: Processes, spatio-temporal variability, and depositional controls","authors":"Carlos A. Giraldo-Villegas ,&nbsp;Francisco J. Rodríguez-Tovar ,&nbsp;Sergio A. Celis ,&nbsp;Andrés Pardo-Trujillo","doi":"10.1016/j.marpetgeo.2025.107385","DOIUrl":"10.1016/j.marpetgeo.2025.107385","url":null,"abstract":"<div><div>Epeiric seas were widespread during the Cretaceous, associated with global sea-level rise. Their stratigraphic record, controlled mainly by eustasy, tectonic and climatic factors, resulted in the accumulation of important hydrocarbon source and reservoir rocks. In the NW of South America-Colombia, an epeiric sea established in the Early Cretaceous—knows as La Luna Sea in the Late Cretaceous—, bounded by a volcanic arc to the western side and by the Amazonian Craton to the east, was progressively filled during the Campanian-Maastrichtian, being these latest Cretaceous deposits important hydrocarbon reservoirs for conventional petroleum systems. In the Campanian-early Maastrichtian period the western side and the central part of the basin had a normal shoreface profile, dominated by pelagic and wave sedimentation processes, while a delta profile dominated by fluvial processes characterized the eastern side. During the late Maastrichtian, directly related to the accretion of western Caribbean terranes, transitional and continental environments dominated by fluvial processes were established on both sides of the basin, suggesting changes in geomorphological-topographic and drainage system characteristics of the emerged areas, leading to the filling of the epeiric basin. The distribution of the deposits was controlled by allogenic processes: tectonism associated with the growth of the proto-Central Cordillera, the global eustatic level, and in minor degree by autogenic processes such as channel avulsion, bottom and longshore currents, and high productivity events. These processes and their variable temporal and spatial influence were responsible for the different types of deposits on either side of the basin, which had a direct impact on the establishment of macrobenthic communities, also providing new exploration ideas related to the reservoirs.</div><div>Comparisons suggest that the size of the receiving and emerged zones plays an important role in the distribution and arrangement of deposits along and across the basin, related to the nature of the internal processes involved in sediment redistribution.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107385"},"PeriodicalIF":3.7,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681242","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":"Shallow gas accumulation mechanism in the Qiongdongnan Basin, South China Sea","authors":"Junfeng Zhang ,&nbsp;Detian Yan ,&nbsp;Jianxiang Pei ,&nbsp;Wei Luo ,&nbsp;Entao Liu ,&nbsp;Peng Song ,&nbsp;Tong Li ,&nbsp;Zeyu Lu ,&nbsp;Xudong Lin","doi":"10.1016/j.marpetgeo.2025.107389","DOIUrl":"10.1016/j.marpetgeo.2025.107389","url":null,"abstract":"<div><div>The Qiongdongnan Basin is one of the most important oil and gas basins in the South China Sea. Previous studies primarily focused on the middle strata around 3000–4000 m. In recent years, abundant shallow oil and gas resources have been discovered in the shallow Ledong Formation of the Qiongdongnan Basin. Previous researchers believed that these shallow accumulations originated from deep strata and that the shallow strata could not serve as effective source rocks. There was a lack of relevant studies on how deep gas sources transport gas to shallow areas, where gas was accumulated in shallow layers, how the cap rock was distributed, and how the transport system, reservoir, and cap rock matched. This research aimed to clarify the types and spatial distribution of transport systems in the study area using 3D seismic data, combined with methods such as root mean square amplitude attributes and variance cube slicing. Simultaneously, it sought to identify the development types and sizes of reservoirs and cap rocks and elucidated the relationships among these three influencing factors, clarifying the process of deep natural gas accumulation in shallow reservoirs. Six transport systems, including diapiric gas chimneys, fracture-type gas chimneys, polygonal faults and fractures, large faults, submarine slump, and multi-stage channels, were identified in this study, along with their distributions. The main reservoirs in the Ledong Formation were submarine fans, slope fans, and shoreland sandbars, with their upper portions predominantly capped by mass transport deposits and mudstone layers. Based on these findings, the spatial matching of transport systems and reservoirs was conducted to clarify the process of gas migration, transport, and accumulation from deep to shallow strata, summarizing corresponding accumulation models. Gas chimneys and faults were considered the primary transport systems, while submarine fans were identified as the highest-quality reservoirs, and mass transport deposits were effective cap rocks. The accumulation model formed by the combination of these three elements represented the primary accumulation mode in the study area. The results of this study will provide guidance for the development of shallow resources in the South China Sea.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107389"},"PeriodicalIF":3.7,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681236","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":"Spatiotemporal hierarchy of fault systems and associated syn-rift stratigraphic sequences across the Santos Basin, offshore SE Brazil","authors":"Peryclys Raynyere de Oliveira Andrade ,&nbsp;Tiago M. Alves ,&nbsp;Mário Neto Cavalcanti de Araújo ,&nbsp;Renata da Silva Schmitt ,&nbsp;Daniel Galvão Carnier Fragoso ,&nbsp;Anderson Henrique de Melo","doi":"10.1016/j.marpetgeo.2025.107384","DOIUrl":"10.1016/j.marpetgeo.2025.107384","url":null,"abstract":"<div><div>This paper uses high-resolution 2D and 3D seismic surveys tied to stratigraphic data from 155 boreholes in the mapping and hierarchization of 1551 extensional faults across the Santos Basin and its Outer High. These faults were able to control deposition in extensional basins with different ages – they are thus classified into three (3) main systems with the aim of understanding their geodynamic significance. Fault system 1 (FS1) controlled the oldest syn-rift sequence and delimits the very first half-graben basins developed during an Early Rift stage. Fault System 2 (FS2) was formed in response to crustal thinning during an Intermediate rifting stage. Fault System 3 (FS3) responded to the migration of the rift axis towards the distal margin in a Late Rift stage. Strikingly, fault reactivation occurred throughout the entirety of the proximal domain of the Santos Basin during the Late Rift Stage. This work is important as each interpreted fault system is understood to have controlled the availability of accommodation space during its peak activity, thereby shaping the inner proximal, outer proximal, and distal domains of the Santos Basin. The evolution of these fault systems also resulted in the deposition of syn-rift sequences that obey a specific order, or ranking. By correlating fault systems with their adjacent syn-rift strata, we propose 1^st-order sequence boundaries that are associated with each stage of the development of the Santos Basin, formed as a consequence of changes in thermo-mechanical conditions during the evolution of rifted margins. Identified 2^nd-order sequences are attributed to tectonic movements at the crustal-block scale. In contrast, stratigraphic sequences of the 3^rd- and 4^th-orders are associated with localised tectonic inputs. Within this framework, we use stratigraphic surfaces as structural markers across multiple observational scales. Consequently, sequence 1SEQ1 corresponds to the stretching phase, standing for the initial stages of rifting within an intraplate setting. Sequence 1SEQ2 relates to the necking stage and formation of the outer proximal domain, whereas sequence 1SEQ3 accompanied the development of the distal domain in the so-called hyperextension and continental-breakup stages. Ultimately, this work demonstrates that the tectono-stratigraphic evolution of continental margins, from the onset of rifting to continental breakup, is documented by a clear, diachronic tectono-stratigraphic record. Such a record varies along and across hierarchized fault systems that are developed at multiple scales of observation.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107384"},"PeriodicalIF":3.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740010","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":"Tectono-stratigraphy of the Shushan Basin, Western Desert, Egypt: A window into the evolution of the SE Mediterranean province","authors":"Ahmed I. Albrkawy ,&nbsp;Tiago M. Alves ,&nbsp;Thomas Blenkinsop","doi":"10.1016/j.marpetgeo.2025.107387","DOIUrl":"10.1016/j.marpetgeo.2025.107387","url":null,"abstract":"<div><div>The SE Mediterranean is a key region documenting the geological history of the Mesozoic Tethys Ocean while comprising one of the most promising provinces in the world in terms of energy resources. Using 2D seismic reflection data tied to exploration wells, this work analyses the Shushan Basin of northern Egypt within a context dominated by continental rifting, ocean propagation, and closure of the Tethys Ocean. Nine (9) seismic megasequences and four (4) major structural trends are identified in the Shushan Basin. In the centre of the basin, the interpreted megasequences document four (4) major tectonic episodes: i) a Paleozoic early-rift stage, ii) a syn-rift stage lasting from the Early Jurassic to the Early Cretaceous, iii) an Aptian-Cenomanian post-rift stage, and iv) a syn-compressional phase that started in the Late Cretaceous and ended in the Miocene. Importantly, the data in this work suggest the presence of up to 1.6 km of Upper Paleozoic-Triassic strata below the Lower Jurassic Ras Qattara Formation. Widespread extension occurred from the Late Triassic to the Early Cretaceous, a period of time in which graben and half-graben basins were formed and delimited by E-W and NW-SE striking faults. Later in the basin's evolution, mild tectonic reactivation predominated and was accompanied by a (post-rift) thermal episode in Northern Egypt. As a corollary, we show that the tectonic episodes interpreted in this work reflect the position of the Shushan Basin near the junction between the southern margin of the Tethys Ocean, the Syrian Arc system, and the Red Sea continental rift. Consequently, regional faults interpreted in this work are grouped into four families with distinct trends: i) Red Sea, ii) Tethyan, iii) Syrian Arc, and iv) Aqaba.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107387"},"PeriodicalIF":3.7,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681240","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}

{"title":"Deciphering hydrocarbon evolution history of the Cambrian shales in tectonically complex basins: Constraints from calcite U-Pb dating and low-temperature thermochronology","authors":"Qingqing Fan ,&nbsp;Dadong Liu ,&nbsp;Hui Tian ,&nbsp;Xuesong Lu ,&nbsp;Yi Chen ,&nbsp;Xia Feng ,&nbsp;Wei Du ,&nbsp;Mingyang Xu ,&nbsp;Xiaoting Pang ,&nbsp;Zijun Tang","doi":"10.1016/j.marpetgeo.2025.107386","DOIUrl":"10.1016/j.marpetgeo.2025.107386","url":null,"abstract":"<div><div>Assessing hydrocarbon evolution of organic-rich shales in tectonically complex basins is critical for shale gas resource evaluation. A major obstacle is the difficulty in precisely constraining the timing of hydrocarbon migration and leakage events. Here, fluid inclusion microthermometry, calcite U-Pb and detrital zircon (U-Th)/He dating were integrated to reconstruct the hydrocarbon evolution history of the Cambrian organic-rich shales in the southeastern margin of the Upper Yangtze Platform. We assessed the dynamic evolution of shale gas content over time by methane isothermal adsorption coupled with geothermometry and geobarometry. The calcite veins yield U-Pb ages of 113.5–108.9 Ma (C1 calcite) and 65.5–65.2 Ma (C2 calcite), with fluid inclusion trapping temperatures of 186.2 °C and 74.8 °C, respectively. Detrital zircon (U-Th)/He dating indicate that the basin inversion started at the Middle Triassic (ca. 241 Ma), leading to a cooling in the shales. The onset of intense exhumation and folding deformation occurred at ca. 113Ma, which corresponds to the Yanshanian Orogeny. This tectonic deformation event triggered the opening of fractures (as indicated by the formation of the C1 calcite veins with ages of ca. 114–109 Ma), facilitating shale gas migration and leakage, with a shale gas loss of at least 0.75 cm³/g. These results demonstrate that combination of fluid inclusion and geochronological data can provide accurate geochronological constraints on shale gas migration and leakage associated with tectonic uplifts, which can be an effective approach to decipher hydrocarbon evolution history of shales in tectonically complex basins worldwide.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107386"},"PeriodicalIF":3.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681238","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":"Asymmetric oceanic crustal accretion and mantle serpentinization in the southwestern propagator tip of the South China Sea basin","authors":"Jialing Zhang ,&nbsp;Chun-Feng Li ,&nbsp;Zhaocai Wu ,&nbsp;Yuhan Li ,&nbsp;Yinxia Fang ,&nbsp;Chongzhi Dong ,&nbsp;He Li","doi":"10.1016/j.marpetgeo.2025.107380","DOIUrl":"10.1016/j.marpetgeo.2025.107380","url":null,"abstract":"<div><div>A multi-channel seismic profile crossing the conjugate continental margins at the southwestern propagator tip of the South China Sea unveils asymmetric crustal structures. The southern margin exhibits rapid necking of the continental crust, while the northern margin features hyper-thinned crust controlled by detachment faults. The northern margin has thicker syn-rift deposits, while in the most distal parts of the southern margin, these deposits become thin or vanish entirely. Notably, the oceanic crustal structure is also asymmetric with respect to the spreading center. North of the spreading center, the oceanic crust is only 2–3 km thick, whereas to the south it is ∼5 km thick. Two sub-horizontal intra-basement reflections are identified in the northern oceanic domain, one representing the interface between basaltic oceanic crust and serpentinized mantle, and the second from gabbroic intrusions. Joint inversion of gravity, magnetic, and seismic data supports the presence of a highly serpentinized mantle beneath the thin oceanic crust. The reduced melting at the ridge-segment end may explain the observed asymmetrical rifting and seafloor spreading.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107380"},"PeriodicalIF":3.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680744","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":"Astronomical forcing of lake-level and environmental changes in saline-alkaline lakes during the Late Paleozoic Ice Age","authors":"Dadong Liu ,&nbsp;Mingyang Xu ,&nbsp;Qian Cao ,&nbsp;Qingqing Fan ,&nbsp;Hui Chen ,&nbsp;Chen Zhang","doi":"10.1016/j.marpetgeo.2025.107383","DOIUrl":"10.1016/j.marpetgeo.2025.107383","url":null,"abstract":"<div><div>The Late Paleozoic Ice Age (LPIA) records Earth's latest icehouse-greenhouse transition, which offers a deep-time perspective for future climatic and environmental predictions. Astronomical cycles are believed to play a key role in the evolution of climatic and environmental changes during the LPIA. However, the interactions among the astronomical forcing, climatic conditions, sea-level and lake-level changes remain ambiguous. Here, we conducted a cyclostratigraphic analysis of gamma ray (GR) and paleo-water depth (WD) data of the upper Carboniferous–lower Permian Fengcheng and Lucaogou formations in the Junggar Basin, NW China. A floating astronomical time scale of <em>∼</em>3.4 Myr for the Fengcheng Formation and <em>∼</em>5 Myr for the Lucaogou Formation are established by astronomical tuning of GR data to the robust 405 kyr eccentricity cycle. The lake-level changes of the two formations are recovered based on the sedimentary noise model, which both show antiphase relationship with relative sea-level fluctuations, however different phase relationship with obliquity amplitude variations. The <em>∼</em>1.2 Myr (s₄–s₃) obliquity amplitude modulation cycle was the main driving force of lake levels in the Northern Hemisphere during the LPIA. In addition, the <em>∼</em>170 kyr cycles regulates the lake-level fluctuations and affect the development of saline-alkaline minerals in the closed lake basins. The cyclical growth and retreat of extensive ice sheets was an important factor that influence the hydrological response to the same obliquity cycle, which reflect the nonlinear response of Earth's climate system to changes in astronomical orbital parameters. We conclude that the combination of climatic background and astronomical forcing cannot be generalized, as they have a more complex superposition mechanism. Our study demonstrates the important role of the termination of icehouse climate in lake evolution and supports the existence of the 'nonlinear response process' across different time scales.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107383"},"PeriodicalIF":3.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642754","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":"Tectono-stratigraphic evolution of multiphase rifts in a hangingwall dip-slope setting: A case study in Eocene western slope, Xihu Sag of East China Sea Shelf Basin","authors":"Xuesong Zhou ,&nbsp;Xiaoming Zhao ,&nbsp;Jiawang Ge ,&nbsp;Massine Bouchakour ,&nbsp;Guofeng Yin ,&nbsp;Jianwei Wang ,&nbsp;Shumei Yan ,&nbsp;Xian Liu","doi":"10.1016/j.marpetgeo.2025.107382","DOIUrl":"10.1016/j.marpetgeo.2025.107382","url":null,"abstract":"<div><div>The hangingwall dip-slope settings are important components of rift basins, being able to influence offshore sedimentation, but a few studies have examined their properties. Their reactivation of growth faults can contribute to re-shape basin geometry influencing the associated stratigraphic successions. This paper investigates the structural evolution of a hangingwall dip-slope setting to explore the development of multiphase rifts that imprint tectonic properties and stress field migration by utilizing seismic, well-log, and core data from the Xihu Sag, East China Sea Shelf Basin. Three composite sequences (CS1-3) are defined within the Eocene syn-rift deposits, along with three third-order sequences in CS3. We have reconstructed the evolution of two tectonic phases: rift phase 1 and rift phase 2. Furthermore, we identified two stages within each phase: rift initiation and rift development 1 for rift phase 1, and rift development 2 and rift termination for rift phase 2. However, an immediate decrease in fault activity was recorded in the rift phase 2. Alterations in the stress field throughout intermittent rift phases led to differences in tectono-stratigraphic structures. In rift phase 1, expansion occurred from small isolated depocenters to larger systems, while rift phase 2 experienced contraction. Concurrently, basin geometry evolved from wedge-shaped half-grabens to dish-like geometries. The tectonic change caused sediment overfilling to starvation in rift phase 1 and sediment starvation to balance filling in rift phase 2. This contribution provides insights into hangingwall dip-slope dynamics and rift basin depositional systems.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"177 ","pages":"Article 107382"},"PeriodicalIF":3.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681237","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}