Acta Geologica Sinica ‐ English Edition最新文献

{"title":"Lithofacies Assemblages, Source-Reservoir Characteristics, and Gas Enrichment Mechanisms of the Permian Longtan Formation Shale in Central Hunan Province, South China","authors":"Jingqiang TAN,&nbsp;Shihao HUA,&nbsp;Xinyao MA,&nbsp;Xiao MA,&nbsp;Yaohua WANG,&nbsp;Baomin ZHANG,&nbsp;Wei TIAN,&nbsp;Bohao WANG","doi":"10.1111/1755-6724.15308","DOIUrl":"https://doi.org/10.1111/1755-6724.15308","url":null,"abstract":"<p>The marine-continental transitional shale of the Upper Permian Longtan Formation is widely distributed in Hunan and shows significant exploration potential. Frequent changes in lithofacies have however notably influenced the shale gas enrichment. The strata of the Longtan Formation in the Shaoyang Depression, central Hunan, were taken as the study object for this project. Three lithofacies assemblages were identified: shale interbedded with sandstone layer (SAL), sandstone interbedded with shale layer (ASL) and laminated shale layer (LSL). The SAL shale shows significant variability in hydrocarbon generation potential, which leads to shale gas characterized by ‘hydrocarbon generation in high total organic carbon (TOC) shale, retention in low TOC shale and accumulation in sandstone’. The ASL shale, influenced by the redox conditions of the depositional environment, shows a lower concentration of organic matter. This results in an enrichment model of ‘hydrocarbon generation and accumulation in shale, with sealing by sandstone’. The laminar structure of LSL shale causes both quartz and clay minerals to control the reservoir. Shale gas is characterized by ‘hydrocarbon generation in mud laminae, retention and accumulation in silty laminae, with multiple intra-source migration paths’. In the marine-continental transitional shale gas system, the enrichment intervals of different types of shale gas reservoirs exhibit significant variability.</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"862-878"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intra-oceanic Subduction in the Eastern Paleo-Asian Ocean: Constraints from Late Carboniferous High-Mg Diorites in Suprasubduction Zone Ophiolites, Central Inner Mongolia, North China","authors":"Peipei DONG,&nbsp;Yingjie LI,&nbsp;Shuai WANG,&nbsp;Xiawei ZHANG,&nbsp;Zhibin LIU,&nbsp;Jinfang WANG,&nbsp;Jinzhao ZHAO,&nbsp;Likao WANG","doi":"10.1111/1755-6724.15306","DOIUrl":"https://doi.org/10.1111/1755-6724.15306","url":null,"abstract":"<p>High-Mg andesite/diorite (HMA) is useful for identifying subduction-related processes in orogenic belts, including the identification of ophiolites formed in suprasubduction zone (SSZ) environments. The E'rentaolegai high-Mg diorite from the Diyanmiao ophiolite in central Inner Mongolia, North China, has been investigated revealing low-K tholeiitic–calc-alkaline characteristics and have SiO₂ contents of 53.44–54.92 wt%, MgO contents of 8.44–9.54 wt%, and Mg^# of 54.35–57.60, with variable Fe₂O₃ (7.51–8.61 wt%), Al₂O₃ (11.95–15.09 wt%), and Na₂O (3.42–3.94 wt%) contents, low K₂O (0.34–0.97 wt%), TiO₂ (0.35–0.67 wt%), and P₂O₅ (0.12–0.15 wt%) contents, and high Ni (43–193 ppm) and Cr (189–556 ppm) contents. Samples collected have low total rare earth element (REE) contents (30.58–77.80 ppm), with flat or slightly right-dipping REE patterns (La_N/Yb_N = 2.19–3.11) and a lack of pronounced Eu anomalies. The samples are also enriched in large-ion lithophile elements (LILEs, e.g., K, Rb, Ba, U, and Sr) and depleted in high field strength elements (e.g., Ta, Nb, Ti, and P). The E'rentaolegai high-Mg diorite has characteristics typical of HMA, and are similar to those of sanukites from the Setouchi Arc in SW Japan. They also display high positive <i>ε</i>_Nd(<i>t</i>) values (+6.32 to +7.80), comparable to the values of their host rocks. Petrogenetic analyses suggest that the E'rentaolegai HMA was probably formed by the interaction of partial melts and aqueous fluids from subducted sediments with mantle peridotite. Zircon U-Pb dating reveals that the high-Mg diorite crystallized at 313.6 ± 2.4 Ma, i.e., late Carboniferous. Combining our data with the temporal and spatial distribution of the Diyanmiao SSZ-type ophiolite, we propose that the eastern Paleo-Asian Ocean had not closed by the late Carboniferous, but intra-oceanic subduction was ongoing. A new model of the initiation of subduction in the eastern PAO during the late Paleozoic.</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"693-706"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cenozoic Vertically-tearing of Indian Slab Modified the Asian Lithosphere beneath the Eastern Tibetan Plateau","authors":"Zengqian HOU,&nbsp;Bo XU,&nbsp;Tiannan YANG,&nbsp;Haijiang ZHANG,&nbsp;Nian YU,&nbsp;Yi ZHAO,&nbsp;Zhuang MIAO","doi":"10.1111/1755-6724.15313","DOIUrl":"https://doi.org/10.1111/1755-6724.15313","url":null,"abstract":"<p>A subducted continental slab is sometimes torn during collision, yet the exact impact of slab-tearing on the overlying lithosphere remains unclear. Here, we image the structure and architecture of the Asian lithosphere above the Indian slab in the eastern Tibetan Plateau using multiscale seismic tomography models and zircon Hf isotopic mapping, respectively. Our mantle <i>V</i>_p model shows that a large low-velocity anomaly extends laterally beneath the thinned Asian lithosphere above the tear zone roughly along the 26°N. The <i>V</i>_s images, magmatic records and Hf isotopic mapping indicate that this low-velocity anomaly recorded an asthenosphere flow eastward along the tear zone, which thermally eroded and refertilized the overlying Asian lithosphere, leading to the lithospheric melting, thinning and root delaminating. The vertical tear also generated a tectonic weak zone with associated Cenozoic potassic and carbonatitic magma suites. We argue that such a hot lithosphere discontinuity provided a reasonable mechanism for the abrupt change of crust thickness and the transformation of crust-mantle deformation from coupling to decoupling across the tear zone.</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"627-633"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1755-6724.15313","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Hydrothermal Alteration and Mineralization of the Middle to Late Jurassic Dabaoshan Porphyry Cu Deposit in South China","authors":"Chenhui ZHAO,&nbsp;Denghong WANG,&nbsp;Chenghui WANG,&nbsp;Yan WANG,&nbsp;Wusheng LIU,&nbsp;Xiong ZHANG,&nbsp;Jinchang JIANG,&nbsp;Tingjie LI","doi":"10.1111/1755-6724.15305","DOIUrl":"https://doi.org/10.1111/1755-6724.15305","url":null,"abstract":"<p>The Dabaoshan porphyry Cu deposit (420 kilotons (kt) of Cu @ 0.36%) is located in South China. The newly discovered Cu orebodies are hosted in the dacite porphyry adjacent to a granodiorite porphyry. The alteration and mineralization timing and stages of the porphyry Cu deposit were not well-constrained. In this study, we combine field mapping, petrography, whole-rock geochemistry, hydrothermal rutile U-Pb dating and Cu isotopes to synthesize an ore model at Dabaoshan. In situ hydrothermal rutile U-Pb dating yields an age of 159 ± 13 Ma, which brackets the timing of porphyry Cu mineralization. From top to bottom, the alteration zones in Dabaoshan are divided into quartz-sericite, biotite, chlorite-epidote, and chlorite-sericite subzones. Veins are classified into four stages (Stage 1 to 4) with Stage 4 quartz-sericite-chalcopyrite veins being the main Cu ore-bearing veins. The mineralized dacite porphyry has high SiO₂, but low MgO, CaO, and Na₂O contents. The chalcopyrite hosted in veins exhibits <i>δ</i>⁶⁵Cu = values ranging from –1.29‰ to 0.51‰. Such copper isotope fractionation is attributed to vapor-brine phase separation, and mixing of fluids from different geochemical reservoirs. The timing of Cu mineralization and hydrothermal alteration support that the Jurassic granodiorite porphyry is an ore-forming intrusion at Dabaoshan.</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 4","pages":"1074-1092"},"PeriodicalIF":3.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transgressive Lacustrine Shale Sedimentary Environment, Enrichment Model and Mechanisms for Organic Matter in the Paleocene Funing Formation, China","authors":"Biao SUN,&nbsp;Xiaoping LIU,&nbsp;Honglin SHU,&nbsp;Gaocheng WANG,&nbsp;Tian LIU,&nbsp;Zuxian HUA,&nbsp;Wendi PENG,&nbsp;Yu YUAN","doi":"10.1111/1755-6724.15302","DOIUrl":"https://doi.org/10.1111/1755-6724.15302","url":null,"abstract":"<p>The relationship between marine transgression and the distribution of lacustrine organic matter has restricted shale oil and gas exploration for decades. In this study, the research objective is to analyze the sedimentary environment and evaluate its influence on organic matter in transgressive lacustrine shale. The study uses various analyses including total organic carbon (TOC), Rock-Eval pyrolysis, gas chromatography-mass spectrometry (GC-MS), trace element and isotope analysis. Finally, the study proposes an enrichment model for organic matter. The lacustrine shale of the second member of the Funing Formation (E₁<i>f</i>²) is divided into three sequences. The results indicate that the depositional environment of the organic matter during this period was an arid and humid, reduced, closed, rift lake basin. In the first sequence, high salinity resulted from increased evaporation, leading to low primary biological productivity. At this time, the lake basin belonged to a salinized closed lake basin. Intermittent transgressions began in the second sequence, with the deep lake area still being dominated by a reducing environment. The third sequence saw the environment evolve into a closed lake basin characterized by a warm and humid freshwater environment with high primary productivity. Marine transgressions introduce a substantial amount of marine plankton, nutrient elements, as well as more CO₂ and CO₃^2– into the lake, leading to increased primary productivity. The sedimentary model for transgressive lacustrine source rocks proposed here serves as an example for similar transgressive lake basins.</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 4","pages":"1119-1133"},"PeriodicalIF":3.7,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origin and Evolution of the Late Middle Pleistocene Trachytes in the Changbaishan Tianchi Volcano (China/North Korea): Insights from Mineralogy, Geochronology and Geochemistry","authors":"Xiqing YE,&nbsp;Zhitao XU,&nbsp;Guido VENTURA,&nbsp;Liying SUN,&nbsp;Zhongwei LI","doi":"10.1111/1755-6724.15301","DOIUrl":"https://doi.org/10.1111/1755-6724.15301","url":null,"abstract":"<p>Cenozoic trachytes are characteristic of some active volcanic fields in China. In particular, the origin and mechanisms of the evolution of trachytes from the Tianchi (Changbaishan) volcano (TV, China/North Korea) are poorly known. Here, we present new geochronological, geochemical and isotopic data on two trachytic suites outcropping on the northern and southern upper slopes of TV. Detailed zircon laser ablation-multicollector-inductively coupled plasma-mass spectrometry (LA-MC-ICP-MS) U-Pb dating, Rb-Sr isochron dating of plagioclase and hornblende, ⁴⁰Ar/³⁹Ar chronology with mineral chemistry, whole-rock element and Sr-Nd-Pb isotope data are used to explore their origins and evolutionary mechanisms during the late Middle Pleistocene. Our data indicate that the trachytes mainly consist of sanidine, orthoclase and plagioclase, with minor albite, quartz and hornblende. They formed at 0.353–0.346 Ma (lava flow from the northern slope) and 0.383–0.311 Ma (lava flow from the southern slope), respectively. The TV trachytes are characterized by high K₂O/Na₂O and AR values, with low A/CNK and Mg^# values. They are enriched in rare earth elements (REEs; except Eu), depleted in Sr and Ba, crystallizing at 742–858°C. The TV trachytes have high (⁸⁷Sr/⁸⁶Sr)_i values (0.70776–0.71195), positive <i>ε</i>_Nd(<i>t</i>) values (0.61–2.93) and radiogenic ²⁰⁶Pb/²⁰⁴Pb values (17.515–17.806). These values are similar to those of the Pleistocene and Holocene TV trachytes. Geochemical data indicate that they were formed by fractional crystallization from a basaltic melt and assimilated upper crust material. The trace element pattern of the studied trachytes is consistent with an evolution from basaltic melts representative of an enriched mantle source. The vent from which the trachytic magma was erupted probably collapsed inside the caldera during the TV ‘Millennium’ eruption (ME) in 946 AD. The contemporaneous emission of basaltic and trachytic magma during the Middle–Late Pleistocene suggests the coexistence of fissural basaltic volcanism and central-type trachytic volcanism, the latter of which was associated with a magma chamber in the upper crust during the TV cone-construction stage.</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"774-788"},"PeriodicalIF":3.5,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rock Magnetic Evidence for the Seismogenic Environment of Large Earthquakes in the Motuo Fault Zone, Eastern Himalayan Syntaxis","authors":"Yong CAO,&nbsp;Zhiming SUN,&nbsp;Yang GAO,&nbsp;Jian LIU,&nbsp;Bin LI,&nbsp;Yuhan YANG,&nbsp;Hao YE,&nbsp;Peng XU","doi":"10.1111/1755-6724.15297","DOIUrl":"https://doi.org/10.1111/1755-6724.15297","url":null,"abstract":"<p>Knowledge of the seismogenic environment of fault zones is critical for understanding the processes and mechanisms of large earthquakes. We conducted a rock magnetic study of the fault rocks and protoliths to investigate the seismogenic environment of earthquakes in the Motuo fault zone, in the eastern Himalayan syntaxis. The results indicate that magnetite is the principal magnetic carrier in the fault rocks and protolith, while the protolith has a higher content of paramagnetic minerals than the fault rocks. The fault rocks are characterized by a high magnetic susceptibility relative to the protolith in the Motuo fault zone. This is likely due to the thermal alteration of paramagnetic minerals to magnetite caused by coseismic frictional heating with concomitant hydrothermal fluid circulation. The high magnetic susceptibility of the fault rocks and neoformed magnetite indicate that large earthquakes with frictional heating temperatures &gt;500°C have occurred in the Motuo fault zone in the past, and that the fault maintained an oxidizing environment with weak fluid action during these earthquakes. Our results reveal the seismogenic environment of the Motuo fault zone, and they are potentially important for the evaluation of the regional stability in the eastern Himalayan syntaxis.</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"896-907"},"PeriodicalIF":3.5,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1755-6724.15297","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Geochronology, Geochemistry and Sr-Nd-Pb Isotopes of the Early–Middle Jurassic Highly Fractionated Granites in Southern Jiangxi, and their Implications for the Rare-Earth Mineralization: Examples from the Muzishan, Xiahu, and Zudong Deposits","authors":"Jiaxin WANG,&nbsp;Xiang FANG,&nbsp;Kelei CHU,&nbsp;Huihu FAN,&nbsp;Wei ZHENG,&nbsp;Bin HUANG,&nbsp;Dehai WU","doi":"10.1111/1755-6724.15303","DOIUrl":"https://doi.org/10.1111/1755-6724.15303","url":null,"abstract":"<p>The pervasively distributed granitoids in South China contributed greatly to regional polymetallic mineralization, including tungsten, tin, copper, gold, rare metals, and rare earth elements (REEs). To ascertain the dynamic backgrounds, rock types and genesis of the parent rocks related to the Early–Middle Jurassic ionic rare earth mineralization, typical deposits at Muzishan, Xiahu, and Zudong were investigated by conducting petrographic, geochronologic, whole-rock geochemical, and Sr-Nd-Pb isotope analyses, which found that the parent rocks from the Muzishan deposit were the A1-type K-feldspar granite (~195 Ma), from the Zudong deposit were the A2-type monzogranite (~171 Ma), and from the Xiahu deposit were the I-type monzogranite (~167 Ma). All the three granitic rocks underwent different degrees of fractionation, with the Xiahu granite experiencing the highest degree, followed by the Zudong granite, and the Muzishan granite undergoing the lowest degree. The Muzishan granite was concluded to be formed under an intraplate extensional tectonic regime influenced by the hotspots or the mantle plume. The Zudong granite was formed in a post-arc extensional setting related to subduction–collision–rollback of the paleo-Pacific Plate, which caused upwelling of the asthenosphere, thinning of the lithosphere, and partial melting of crustal materials. The Xiahu granite was generated under a transitional tectonic setting of extension and compression, triggered by delamination and rollback of the paleo-Pacific Plate.</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 4","pages":"995-1012"},"PeriodicalIF":3.7,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144923710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochronology and Geochemistry of Paleozoic S-type Granites in the Western Segment of the East Kunlun Orogen and its Implications for Tectonic Evolution","authors":"Haidong REN,&nbsp;Tong PAN,&nbsp;Tao WANG,&nbsp;Bingzhang WANG,&nbsp;Xiaoxia WANG,&nbsp;Jianjun ZHANG,&nbsp;Jianguo WANG,&nbsp;Wentao ZHAO","doi":"10.1111/1755-6724.15294","DOIUrl":"https://doi.org/10.1111/1755-6724.15294","url":null,"abstract":"<p>In the western segment of the East Kunlun Orogen (WEKO), muscovite granite and garnet granite from the Hureguole intrusion exhibit zircon U-Pb ages of 435–442 Ma. Geochemically, these rocks contain high concentrations of SiO₂, K₂O and Al₂O₃, with low concentrations of TiO₂ and MgO, indicating a peraluminous high-K calc-alkaline affinity. They are enriched in Rb, Th, U and LREE, depleted in Eu, Ba, Sr and Ti, being classified as S-type granites. Negative whole-rock <i>ε</i>_Nd(<i>t</i>) values (–9.8 to –9.1) and zircon <i>ε</i>_Hf(<i>t</i>) values (–11.6 to –8.2) for those granites indicate that they were derived from partial melting of pelitic rocks in the Paleoproterozoic Baishahe Formation of the Jinshuikou Group. Based on the collected zircon ages, Cambrian–Devonian magmatic activity in the WEKO was divided into three stages: early (446–520 Ma), middle (427–441 Ma) and late (372–424 Ma) stages. Statistically, whole-rock Nd and zircon Hf isotope data (<i>ε</i>_Nd(<i>t</i>)/<i>T</i>_DM^Nd, <i>ε</i>_Hf(<i>t</i>)/<i>T</i>_DMC^Hf) from Paleozoic igneous rocks in the WEKO reveal a magma source that was initially dominated by depleted mantle components in the northward subduction stage of the Proto-Tethyan Ocean plate (446–520 Ma), shifting to predominantly crustal sources during the closure period of the North Qimantagh back-arc basin (427–441 Ma), then to crust-mantle mixed sources in the post-collision stage (372–424 Ma).</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"743-760"},"PeriodicalIF":3.5,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stratigraphic Revision of the Selendi, Güre, and Uşak Neogene Basins, Western Anatolia","authors":"Fikret GÖKTAŞ,&nbsp;Serdar MAYDA,&nbsp;Mehmet Cihat ALÇİÇEK","doi":"10.1111/1755-6724.15279","DOIUrl":"https://doi.org/10.1111/1755-6724.15279","url":null,"abstract":"<p>In a re-examination of the Neogene stratigraphy of the Uşak, Güre, and Selendi basins of western Anatolia, western Turkey, the stratigraphic position of the previously defined İnay Group is revised, which was previously considered to be of the Middle Miocene age. Based on mammalian biochronology and stratigraphic relationships, two sequences are identified, separated by conformable/transitional contacts within the former group: the Middle Miocene Güre Group is composed of the Fakılı Formation, characterized by alluvial fan deposits, and the lacustrine Derbent Formation. Radiometric dating of alkaline volcanics laterally associated with Güre Group sediments in the Uşak and Güre basins, and mammalian fossils re-evaluated into the MN5-6 biozones in the Selendi Basin, indicate early Middle Miocene. Considering the stratigraphic relationship with the overlying early Late Miocene İnay Group as redefined, we estimate that the Güre Group was deposited in the Middle Miocene. The İnay Group is characterized by a lateral–vertical transition from alluvial deposits of the Ahmetler Formation to the overlying lacustrine Ulubey Formation. An MN9-10 fauna, containing deinotheres, was found within the latter formation.</p>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 2","pages":"332-351"},"PeriodicalIF":3.5,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1755-6724.15279","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143879929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}