Sedimentary Geology最新文献

{"title":"Integrated investigation of rare earth elements, molecular fossils, and stable isotopes in drill cores from deep-buried strata in the Yangtze Block: Implications for the Early Cambrian sedimentary environments","authors":"Moïse Luemba ,&nbsp;Zhonghong Chen ,&nbsp;Zhi Chai ,&nbsp;Yong Chen ,&nbsp;N'nahano-Ruhindwa Heritier ,&nbsp;Raphael Matamba","doi":"10.1016/j.sedgeo.2025.106878","DOIUrl":"10.1016/j.sedgeo.2025.106878","url":null,"abstract":"<div><div>Geological records of the Lower Paleozoic indicate the co-occurrence of large-scale geo- and bio-events, including the diversification of marine complex life and widespread phosphogenesis, making the Early Cambrian aquatic environments a long-standing subject of global interest. Despite extensive research, the interplay between paleoclimate, continental chemical weathering, seawater redox conditions, and salinity during the Cambrian Explosion remains debated. To address this, we conducted geochemical analyses (e.g., XRF, ICP-MS, MRM GC–MS, and IRMS) and optical microscopy on drill cores from the Early Cambrian deep-buried strata (&gt;4 km depth) in an intrashelf basin within the Yangtze Block. Geochemical proxies, including pronounced negative cerium anomalies (as low as 0.20) and a positive pristane-to-phytane ratio excursion, indicate an expansion of oxic waters between ∼531 and 526 Ma, while widespread anoxic conditions prevailed around 531 and 526 Ma. Climate fluctuations between arid and humid periods are inferred from major elements (e.g., Al, Fe, Mn), trace element ratios (e.g., Rb/Sr, Sr/Cu), and rare earth element parameters (e.g., ΣLREE/ΣHREE, Y/Ho). High gammacerane index values (up to 0.41), the presence of <em>β</em>-carotene, elevated Sr/Ba ratio, and <em>δ</em>^<em>18</em><em>O</em> values (up to −4.87 ‰) suggest periods of high salinity and evaporative conditions during arid phases. Organic geochemical signatures, including a high carbon preference index (CPI &gt; 1) and highly negative <em>δ</em>^<em>13</em><em>C</em> values (&lt;−24 ‰), indicate a biological origin of organic matter, with measurable 2-methylhopane (up to 2.48 %) and 4-methylsterane indices (up to 20 %) suggesting contributions from primary producers such as cyanobacteria, alphaproteobacteria, and dinoflagellates. The co-occurrence of oxygenated, highly saline, and evaporative Ca-P-rich waters with the diversification of small shelly fossil assemblages (SSFs 2 and 3) suggests that the studied intrashelf basin provided a favorable setting for the emergence and diversification of complex life. These findings offer new insights into the paleoenvironmental conditions that shaped marine ecosystems during the Cambrian radiation.</div></div>","PeriodicalId":21575,"journal":{"name":"Sedimentary Geology","volume":"481 ","pages":"Article 106878"},"PeriodicalIF":2.7,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768891","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":"Introducing a water activity coefficient to account for abundance and isotopic compositions of gypsum and halite in the Mediterranean's salt giant deposit","authors":"William B.F. Ryan ,&nbsp;Fadl Raad","doi":"10.1016/j.sedgeo.2025.106876","DOIUrl":"10.1016/j.sedgeo.2025.106876","url":null,"abstract":"<div><div>A simple box model is developed to access the astronomical-modulated exchange of ocean seawater with the Mediterranean during the Late Miocene salinity crisis. The model differs from previous ones by using a unidirectional portal as the method to get salinity to increase to saturation for gypsum and halite. Flow through the entry portal switches in direction as climate oscillates from arid to wet during each precession cycle. The calculations incorporate a water activity coefficient that reduces the rate of evaporation as salinity increases. As a result, the accumulation rate of gypsum and halite declines with time. The sodium, sulfate, potassium and magnesium ions observed from fluid inclusions in gypsum and halite are replicated in the model. The reduction in input from the exterior ocean and eventual closure of the gateway conforms with the sedimentological and geochemical behavior of the gypsum deposits on margins and halite in salt mines and reflection profiles. By showing that rain and rivers supply eight times more water to the Mediterranean brine than seawater during the hypersaline stage of the Late Miocene salinity crisis, the calculations resolve the geochemical riddle of “<em>low salinity gypsum</em>”. The sulfur isotopes in gypsum derive from ocean seawater and the oxygen and hydrogen isotopes in the gypsum hydration water from atmospheric precipitation.</div></div>","PeriodicalId":21575,"journal":{"name":"Sedimentary Geology","volume":"481 ","pages":"Article 106876"},"PeriodicalIF":2.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716249","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":"Surface microtextures of quartz grains under intermittent sediment transport in a gravel bed in the Hantan River, South Korea","authors":"Soyoung Baek ,&nbsp;Kyoung-nam Jo","doi":"10.1016/j.sedgeo.2025.106874","DOIUrl":"10.1016/j.sedgeo.2025.106874","url":null,"abstract":"<div><div>Surface microtextures of quartz grains (SMQs), which are observable using scanning electron microscopy (SEM), provide direct evidence for reconstructing the sedimentary history of individual grains. Detailed SMQ investigations across diverse modern river systems are essential to better understand the factors controlling SMQ formation in fluvial sediments; however, comprehensive studies of diverse modern fluvial systems remain limited. In this study, we examined SMQ characteristics in a gravel bed of the monsoon-influenced Hantan River on the Korean Peninsula. Hantan River sediments maintain angular to subangular grain outlines throughout downstream areas, exhibiting no gradual changes in either grain outlines or other mechanical microtextures. In contrast to typical fluvial sediment characteristics, upturned plates predominate rather than V-shaped percussion cracks. These features reflect episodic sediment transport driven by seasonal discharge variations in this gravel bed river system. Statistical analysis revealed distinct SMQ frequencies between the mainstream and tributaries, with the mainstream showing higher abrasion features (subangular outlines, conchoidal fractures, and V-shaped percussion cracks), whereas tributaries exhibited fresher surfaces (angular outlines and flat cleavage surfaces). These differences primarily reflect variation in transport distance from source areas, as tributaries, which are shorter and surrounded by mountainous terrain, maintained more direct sediment input characteristics, whereas mainstream sediments showed mixed features due to longer transport distance and tributary inputs. Our SMQ study in modern fluvial environments contributes to enhanced interpretations of past depositional conditions and further suggests a need to refine current SMQ classification systems.</div></div>","PeriodicalId":21575,"journal":{"name":"Sedimentary Geology","volume":"481 ","pages":"Article 106874"},"PeriodicalIF":2.7,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679209","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":"A comprehensive analysis of the Cambrian Drumian carbon isotope excursion (DICE): Insights from paleoclimate, paleoenvironment and global correlations","authors":"Qiang Gu ,&nbsp;Fengcun Xing ,&nbsp;Karem Azmy ,&nbsp;Xin Jin ,&nbsp;Xiaoquan Chen ,&nbsp;Chunlin Zhang ,&nbsp;Hongshan Qian ,&nbsp;Jiao Wen","doi":"10.1016/j.sedgeo.2025.106875","DOIUrl":"10.1016/j.sedgeo.2025.106875","url":null,"abstract":"<div><div>The Drumian Carbon Isotope Excursion (DICE) has been proposed as a potential marker for the Global Boundary Stratum Section and Point (GSSP) at the base of the Drumian. However, the characteristics of δ¹³C excursions (i.e., strength, number of subpeaks, and range of the excursion) show significant regional variability, necessitating further verification. Additionally, the paleoenvironmental conditions during the DICE event require deeper investigation to better understand their nature and mechanism. The current study examines carbon-isotope variations across the Qinglongshan section, a representative site within the Miaolingian–Furongian carbonate platform of the Ordos Basin, which spans the DICE event. The δ¹³C profile of the section documents several key carbon-isotope excursion events: the global Steptoean Positive Isotopic Carbon Excursion (SPICE, ∼2.5 ‰ positive excursion), DICE (∼4.0 ‰ negative excursion 1), and a potential globally negative excursion 2 (NE2, ∼3.5 ‰) which may correlate with the Drumian–Guzhangian boundary. These excursions are linked to major fluctuations in the carbon cycle and significant environmental changes. Sedimentological and geochemical analyses suggest that the DICE event coincided with marine transgression and a shift from warm and arid to more humid climate. The climate transition likely enhanced chemical weathering and increased terrestrial detrital input, leading to reduced salinity and intermittent anoxic conditions. Variations in seawater chemistry driven by sealevel and terrestrial input fluctuations likely contributed to the deposition of alternating red beds and negative excursion of DICE. Minor discrepancies in the stratigraphic position of the global δ¹³C peak may reflect uncertainties in biostratigraphy or limitations in data resolution. Moreover, terrestrial input is thought to have influenced both the amplitude of the peak negative δ¹³C values and the overall duration of the DICE event.</div></div>","PeriodicalId":21575,"journal":{"name":"Sedimentary Geology","volume":"481 ","pages":"Article 106875"},"PeriodicalIF":2.7,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679207","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":"Corrigendum to “Shell beaches to beachrock: Diagenetic stable isotopic trends” [Sediment. Geol. 391 (2019) 105520]","authors":"Megan Brock Casillas,&nbsp;Henry S. Chafetz","doi":"10.1016/j.sedgeo.2025.106872","DOIUrl":"10.1016/j.sedgeo.2025.106872","url":null,"abstract":"","PeriodicalId":21575,"journal":{"name":"Sedimentary Geology","volume":"481 ","pages":"Article 106872"},"PeriodicalIF":2.7,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654777","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":"Sequence stratigraphy in continental endorheic basins: New contributions from the case of the northern extensional Teruel Basin","authors":"Lope Ezquerro ,&nbsp;Carlos L. Liesa ,&nbsp;José L. Simón ,&nbsp;Aránzazu Luzón","doi":"10.1016/j.sedgeo.2025.106868","DOIUrl":"10.1016/j.sedgeo.2025.106868","url":null,"abstract":"<div><div>The tectono-sedimentary analysis is a sequence stratigraphy method particularly useful in continental tectonically active basins far from the influence of sea level changes. It provides a comprehensive study of the sedimentary features and stratigraphic architecture of a basin focusing on the stratigraphical, mainly cyclic, trend of the rock record in order to define genetic (tectono-sedimentary units-TSUs) controlled by allocyclic factors: tectonics and climate. The tectono-sedimentary analysis has been traditionally used in basins related to compressive stress regimes, but their application in extensional basins is less common. In this work the results of the detailed tectono-sedimentary analysis of the northern Teruel Basin rocks are presented. Vertical and lateral distribution of mappable lithofacies associations reveal different depositional systems laterally related and the main paleogeographic changes from the Late Miocene to Early Gelasian (11–1.8 Myr). Five main alluvial progradational-retrogradational cycles integrate six TSUs with chronostratigraphical meaning, bounded by isochronous stratigraphic surfaces (sedimentary breaks) that represent maximum alluvial progradations, and define the basin geodynamic framework. A main challenge, not commonly addressed in this kind of studies, is the discrimination of the effects of tectonic and climate for each unit, which has been based on evidences of synsedimentary tectonism in combination with δ¹⁸O_PDB isotope data. It is demonstrated that the sedimentary evolution was mainly controlled by the tectonics, with the phases of tectonic activity being consistently recorded as alluvial progradations (correlative lacustrine retractions) and climate only modulating (amplifying or vanishing) the tectonic effects. Certain guidelines are proposed to adequately recognize and characterize genetic units in continental extensional basins. Our results reinforce TSUs as very valuable tools for studying active continental basins far from sea level effects and to discriminate the influence of allogenic controls in sedimentation.</div></div>","PeriodicalId":21575,"journal":{"name":"Sedimentary Geology","volume":"481 ","pages":"Article 106868"},"PeriodicalIF":2.7,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679208","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":"Upwelling controls organic matter enrichment and organic carbon cycle in the shelf area of the Doushantuo Formation","authors":"Junfeng Zhang ,&nbsp;Detian Yan ,&nbsp;Dan Zhao ,&nbsp;Zeyu Lu","doi":"10.1016/j.sedgeo.2025.106873","DOIUrl":"10.1016/j.sedgeo.2025.106873","url":null,"abstract":"<div><div>As the oldest shale in South China with potential for exploration, the black shale of the second member of the Doushantuo Formation holds significant research importance and economic value because it records the organic carbon cycle during that period. Previous studies have suggested that the formation of the organic-rich black shale in the second member of the Doushantuo Formation was primarily controlled by an anoxic depositional environment. However, investigations of samples from shelf lagoons have revealed otherwise. In this research, microstructural observations, organic carbon content, elemental geochemistry and C_org-N isotopes of the black shale at the Qinglinkou section and well YD in the middle Yangtze were conducted. The results indicate that the formation mechanisms and paleoenvironment of organic-rich shale in the lower and upper halves of the second member are distinct. The presence of apatite and the characteristics of upwelling proxies suggest the occurrence of upwelling during the sedimentation period of the upper half of the second member. The research results indicate that upwelling directly enhances primary productivity levels during sedimentation in the upper half, bolstering the exchange of nutrients and elements within the water column, which facilitates organic matter enrichment and exacerbates the anoxia of deeper waters. In contrast, the organic matter enrichment in the lower half of the Doushantuo Formation's second member is conventional and is governed primarily by anoxic depositional environments; however, it lacks high productivity and is worse overall than the upper half. Moreover, because the water column is restricted, the organic carbon cycle in the lower half is slow and limited. The organic carbon cycle in the upper half benefits from the nutrients brought by upwelling, which results in better formation and preservation. The role of upwelling in altering the deep-water environment of shelf lagoons and in organic matter accumulation and the organic carbon cycle was emphasized in this study, providing guidance for the study of shale deposition globally during the same period.</div></div>","PeriodicalId":21575,"journal":{"name":"Sedimentary Geology","volume":"481 ","pages":"Article 106873"},"PeriodicalIF":2.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636551","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":"Clay mineral of different lithofacies in a continental shallow water delta: Insights from paleoclimate and diagenesis","authors":"Shaoyun Chen ,&nbsp;Yongqiang Yang ,&nbsp;Zaixing Jiang ,&nbsp;Xiaojuan Wang ,&nbsp;Longwei Qiu ,&nbsp;Yerejiepu Habulashenmu","doi":"10.1016/j.sedgeo.2025.106869","DOIUrl":"10.1016/j.sedgeo.2025.106869","url":null,"abstract":"<div><div>Clay minerals in clastic sediments carry important geological information, with their composition and variations reflecting key geological processes. This study investigates the differential clay mineral assemblages among lithofacies within the Middle Jurassic continental shallow-water delta system of the Sichuan Basin, China. Integrated geochemical and XRD analyses demonstrate the significant influence of paleoclimate-driven weathering and diagenetic alteration on clay mineral assemblages. The invariant geochemical characteristics (such as Ti/Al) across different mudstone confirm a uniform provenance, establishing paleoclimate-controlled weathering processes as the principal determinant of clay mineral composition, with negligible provenance influence. Chemical weathering intensity, controlled by the depositional paleoclimate, is a primary factor influencing clay mineral composition in mudstones. In warm, humid climates, abundant rainfall and strong chemical weathering lead to kaolinite enrichment and smectite depletion in black shale facies. Conversely, in cooler, drier climates, physical weathering dominates, resulting in significant illite formation in red mudstone and paleosol facies. In sandstone facies, clay minerals are controlled by diagenetic fluid composition and flux. Chlorite content is related to the primary permeability of the sandstone, while illite content is influenced by K⁺ concentration in diagenetic fluids, with stronger illite enrichment in areas of intense feldspar dissolution. The smectite-to-illite transformation is common in both sandstone and mudstone facies, with its extent influenced by the openness of the diagenetic system and K⁺ availability. In humid conditions, feldspar dissolution in an open system leads to K⁺ advection into sandstone, reducing smectite-to-illite transformation in mudstones. In semi-arid conditions, feldspar dissolution occurs in closed systems during burial, with K⁺ diffusing into mudstones, promoting greater illitization in mudstones than in sandstones. This study provides insights into how paleoclimate and diagenesis control clay mineral transformations in sedimentary rocks.</div></div>","PeriodicalId":21575,"journal":{"name":"Sedimentary Geology","volume":"481 ","pages":"Article 106869"},"PeriodicalIF":2.7,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620406","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":"Thermal maturity and colors of Cretaceous East Asian fossil eggs","authors":"Seung Choi ,&nbsp;Shukang Zhang ,&nbsp;Noe-Heon Kim ,&nbsp;Jin Jung Kweon ,&nbsp;Kohei Tanaka ,&nbsp;Katsuhiro Kubota ,&nbsp;Yuong-Nam Lee ,&nbsp;Junfang Xie ,&nbsp;In Sung Paik ,&nbsp;Sung Keun Lee","doi":"10.1016/j.sedgeo.2025.106855","DOIUrl":"10.1016/j.sedgeo.2025.106855","url":null,"abstract":"<div><div>Several factors influence the quality of fossil preservation, with temperature being one of the key variables. The maximum temperature that fossils have experienced during their taphonomic history affects their thermal maturity and color. Cretaceous fossil eggs of amniote vertebrates from East Asia were analyzed using Raman spectroscopy to investigate their thermal maturity. Eggs from inland regions of East Asia (Mongolia and inland China) do not show a significant thermal imprint, while eggs from the southern and eastern regions of East Asia (coastal China, Korea, and Japan) show a high thermal maturity. Although this pattern must have been caused by the combined effect of complex factors (e.g., burial depth, stratigraphic position, and local geothermal phenomenon), the rollback of the Paleo-Pacific Plate during the Cretaceous and consequent vigorous igneous activity and/or high heat flow near the subduction boundary may have been one of the main working factors. The approach of this study can be extended to fossil eggs from other continents to elucidate the relationship between thermal maturity and geological setting, and will provide a deeper understanding of fossil egg taphonomy.</div></div>","PeriodicalId":21575,"journal":{"name":"Sedimentary Geology","volume":"481 ","pages":"Article 106855"},"PeriodicalIF":2.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725983","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":"Arc-continent collision as recorded in modern stream sand from Oecusse (Timor Island)","authors":"Victor A.S. Vicente ,&nbsp;Pedro Dinis ,&nbsp;Eduardo Garzanti ,&nbsp;Alberto Resentini ,&nbsp;Marta Barbarano ,&nbsp;Marina Cabral Pinto ,&nbsp;João Pratas","doi":"10.1016/j.sedgeo.2025.106852","DOIUrl":"10.1016/j.sedgeo.2025.106852","url":null,"abstract":"<div><div>The small territory of Oecusse in Timor Island has extremely complex geology, influenced by the collision of the Australian continent with the Banda Arc. In Oecusse, sedimentary, volcanic and metamorphic units associated with the lower plate Australian continental margin, the upper plate Banda Terrane, and synorogenic sedimentary successions are exposed. In this study, geochemistry, petrography, and heavy-mineral data on fluvial bedload sand transported by first- and second-order streams are used to better understand the status of arc-continent collision in Timor and the geological nature of the terranes involved in this tectonic process. The presence of upper mantle outliers in Oecusse is readily revealed by serpentinite grains, a heavy mineral assemblage with enstatite, olivine and Cr-spinel, and by Cr, Fe, Sc, Ti, and V concentrations comparable to the Primitive Mantle standard. Volcanic sources occur both in the Banda Terrane and Australian continental margin. The Manamas Formation (Miocene, Banda Terrane) is the most prominent volcanic source, shedding detritus dominated by mafic volcanic rock fragments, plagioclase, and clinopyroxene, with a geochemical signature similar to the Primitive Mantle. The volcanic units of the Barique Formation (Eocene-Miocene, Banda Terrane) and the Maubisse Formation (Permian, Australian continental margin) comprise compositionally heterogenous suites and are intercalated with sedimentary successions, delivering more felsic material, as indicated by the diversified assemblages of lithic fragments and heavy-minerals. Geochemically, they are characterised by lower contents of most compatible elements, higher contents of Th, Y and REE, steeper REE profiles, and stronger negative Eu anomaly than Manamas-derived detritus. These petrographic and geochemical features locally reveal a major felsic volcanic component in the Barique Formation, which cannot be related to the ongoing orogeny because of its proposed late Eocene to early Miocene age. With the exception of coastal sectors where the Manamas Formation is widely exposed, volcanic, sedimentary and low-rank meta-sedimentary rocks partially derived from the Australian lower plate tend to prevail, confirming that arc-continent collision is still at an early stage in the western part of Timor Island.</div></div>","PeriodicalId":21575,"journal":{"name":"Sedimentary Geology","volume":"481 ","pages":"Article 106852"},"PeriodicalIF":2.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654776","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}