Journal of Asian Earth Sciences最新文献

{"title":"Mud volcanoes and microbial communities: Unraveling the mysteries of formation, features, and occurrence","authors":"Senthil Kumar Rajendran ,&nbsp;Suprokash Koner ,&nbsp;Bashir Hussain ,&nbsp;Hsin-Chi Tsai ,&nbsp;Zeng-Yei Hseu ,&nbsp;Jung-Sheng Chen ,&nbsp;Shih-Wei Huang ,&nbsp;Danish Ali ,&nbsp;Muhammad Adil Khan ,&nbsp;Bing-Mu Hsu","doi":"10.1016/j.jseaes.2025.106635","DOIUrl":"10.1016/j.jseaes.2025.106635","url":null,"abstract":"<div><div>Over two thousand mud volcanoes have been documented worldwide, predominantly forming in geologically active regions characterized by rapid sedimentation, recent magmatic activity, and compressional tectonics. These features originate from gravitative instability and fluid overpressure, which induce hydrofracturing of impermeable strata, allowing the release of water, gas, and sediments to the surface. As a result, mud volcanoes occur across a range of tectonic and sedimentary settings, including active margins, accretionary complexes, thrust belts, and deep sedimentary basins. They are generally classified as either submarine or terrestrial mud volcanoes, with the former typically associated with tectonic deformation and the later with sediment accumulation in continental settings. Beyond their geological significance, mud volcanoes contribute substantially to global geochemical and biogeochemical processes, influencing methane production and consumption, nutrient cycling, and organic matter transformation. Additionally, microbial communities are essential in the formation and maintenance of mud volcano structures by contributing to the biomineralization of carbonates and sulfates. The microbial communities found in different mud volcanoes are diverse, and their composition can vary based on location, depth, and geochemical conditions. Moreover, these microbial communities have evolved to utilize diverse sources of energy, including hydrogen, methane, and sulfur, to facilitate metabolic processes. This review summarizes the current insights into the formation, distribution, and environmental constraints of mud volcanoes, while highlighting the ecological relevance and metabolic capabilities of associated microbial communities based on metagenomics data to support interdisciplinary research into geobiological interactions in extreme ecosystems.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"290 ","pages":"Article 106635"},"PeriodicalIF":2.7,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887359","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 accumulation model of ultra-deep marine natural gas in the Shuntuoguole low Uplift of the Tarim Basin, NW China","authors":"Weilong PENG ,&nbsp;Quanyou LIU ,&nbsp;Yongsheng MA ,&nbsp;Shang DENG ,&nbsp;Dongya ZHU ,&nbsp;Qingqiang MENG ,&nbsp;Huiyuan XU ,&nbsp;Xiaowei HUANG","doi":"10.1016/j.jseaes.2025.106639","DOIUrl":"10.1016/j.jseaes.2025.106639","url":null,"abstract":"<div><div>The Tarim Basin, with its relatively low level of exploration, is one of China’s largest superimposed petroliferous basins. Recent exploration advancements in the Shunbei-Shunnan area highlight the significant potential for ultra-deep marine natural gas. However, uncertainties surrounding the origin, alteration, and accumulation models of ultra-deep marine natural gas have greatly hindered future hydrocarbon exploration. This study systematically analyzes the geochemical characteristics and genesis of ultra-deep marine natural gas in the Shunbei-Shunnan area. Results indicate that the natural gas in this region comprises both primary and oil-cracking gases. Specifically, the Shunbei area’s natural gas is primarily oil-associated, dominated by primary cracking gas with minor contributions from oil-cracking gas, whereas the Shunnan area’s natural gas is predominantly oil-cracking gas. The maturity of marine natural gas varies, being higher near the Manjiaer Depression and relatively lower farther away. A sequential distribution of highly mature dry gas, condensate oil and gas, volatile oil, and light oil, accompanied by a gradual decrease in gas–oil ratio, is observed with increasing distance from the Manjiaer Depression. The marine natural gas in the Shunbei-Shunnan area has undergone various alterations, including cracking, thermochemical sulfate reduction, and hydrothermal fluid alteration. Hydrocarbon alteration is more pronounced in the Shunnan area than in the Shunbei area. The active period of strike-slip faults in the Shunbei-Shunnan area coincides with the major hydrocarbon generation and expulsion phases of the source rock. These strike-slip faults serve as critical conduits for hydrocarbon migration, enabling oil and gas to migrate vertically into the middle and upper Ordovician reservoirs, where they form the primary reservoir spaces for accumulation.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"290 ","pages":"Article 106639"},"PeriodicalIF":2.7,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887360","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":"Petrogenesis and tectonic implications of Early Miocene adakitic granites in the Menderes Massif (western Türkiye)","authors":"Ömer Kamacı","doi":"10.1016/j.jseaes.2025.106636","DOIUrl":"10.1016/j.jseaes.2025.106636","url":null,"abstract":"<div><div>The Menderes Massif, a significant Alpide metamorphic complex in Türkiye, is recognized as one of the most extensively studied core complexes globally, characterized by <em>syn</em>-extensional intrusions with diverse geochemical characteristics. Among these is the Güneşli granite, located in the northern Gördes submassif, which intrudes the basement migmatites. This study presents the petrography, geochemistry, Sr-Nd isotope compositions, and U-Pb zircon dating of the Güneşli granite. The intrusion consists of monzogranite, granodiorite and a late-stage pegmatite. Granodiorite is located in the core zone, while monzogranite contacts migmatites. Textures and contact relationships suggest shallow emplacement. U-Pb zircon dating yields an Early Miocene age of 22.3 ± 1.2 Ma. Geochemically, the Güneşli granite has high SiO₂ (&gt;71.6 wt%) and is slightly peraluminous (ASI = 1.0–1.1), classifying it as I-type granite. It shows calc-alkaline to high-K calc-alkaline affinities. Source characteristics indicate high-K mafic rocks to tonalite. The high Sr/Y (avg 47.5 ppm) and La_N/Yb_N (avg 32.4 ppm) ratios, and Eu/Eu* (0.8 to 1.4), suggest an adakitic signature. Its potassic nature (K₂O/Na₂O &gt; 0.5) and low MgO content suggest derivation from lower crustal depths rather than slab melting. Additionally, high Dy_N/Yb_N and La_N/Yb_N ratios indicate garnet presence in the source. The ⁸⁷Sr/⁸⁶Sr and εNd values range from 0.709275 to 0.712199 and from −10.6 to −7.3, suggesting the possibility of upper crustal assimilation during crystallization. The Güneşli granite was likely derived from deep crustal sections of the Menderes Massif during the Aegean extensional period, coinciding with Early Miocene core complex exhumations.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"290 ","pages":"Article 106636"},"PeriodicalIF":2.7,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883101","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 of the Late Jurassic Juyuan tungsten deposit in Central Jiangxi, South China: Constraints from in-situ U-Pb dating of wolframite, trace elements of tungsten minerals and Sr isotope of scheelite","authors":"Ji Zhang ,&nbsp;Guanglai Li ,&nbsp;Chengxiang Li ,&nbsp;Xinglin Wei ,&nbsp;Ye Su ,&nbsp;Xiaodan Liu ,&nbsp;Kai Xu ,&nbsp;Xiaoyan Yin","doi":"10.1016/j.jseaes.2025.106637","DOIUrl":"10.1016/j.jseaes.2025.106637","url":null,"abstract":"<div><div>The Juyuan tungsten deposit is one of the few large quartz vein-type scheelite deposits in South China, but its ore-forming age and fluid evolution history remain unclear. In this study, we conducted U-Pb dating and trace element analysis of wolframite, as well as trace element and Sr isotope analysis of scheelite using in-situ LA-ICP-MS and LA-MC-ICP-MS, respectively. The ore-forming age of the Juyuan tungsten deposit is 155.8 ± 4.6 Ma (MSWD = 1.9), which is consistent with the magmatic age of the Juyuan granite porphyry. Wolframite exhibits a low δEu value and is enriched in Nb and Ta. The formation of Juyuan scheelite occurred in three stages: Sch-I scheelite has a high total REE content, a ‘hump-shaped’ chondrite-normalized REE distribution curve, and the lowest δEu value; Sch-II scheelite also has a high REE content, but the MREE gradually depletes, the chondrite-normalized REE distribution curve flattens, and the δEu value increases; Sch-III scheelite shows significant MREE depletion, a concave distribution curve, and a strong positive Eu anomaly. The ore-forming environment was reduced in the early stage of Juyuan tungsten mineralization, but the introduction of atmospheric precipitation increased oxygen fugacity and decreased salinity. Sr isotope analysis of scheelite confirms that the Juyuan tungsten deposit is genetically related to the granite porphyry, and due to water–rock interactions, the initial ⁸⁷Sr/⁸⁶Sr ratio increased.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"290 ","pages":"Article 106637"},"PeriodicalIF":2.7,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887361","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 structure and fault interpretation of the foreland basin system in the middle Taiwan Strait","authors":"Yung-Hsiang Su ,&nbsp;Tan K. Wang ,&nbsp;Sebastian Wege","doi":"10.1016/j.jseaes.2025.106630","DOIUrl":"10.1016/j.jseaes.2025.106630","url":null,"abstract":"<div><div>Since 2017, we have conducted several surveys to collect multi-channel seismic (MCS) and ocean-bottom seismometer (OBS) data in the middle Taiwan Strait. From the MCS data analysis, the fault distribution in the middle Taiwan Strait is mainly characterized by the normal faults. However, west of the Changyun Ridge, the fault distribution based on depth migrated sections is dominated by the strike-slip faults characterized by flower structures. The strike-slip faults were initiated between two rifted basins and reactivated after rifting. Based on the focal mechanisms and the striking direction of the faults, the strike-slip faults west of the Changyun Ridge are recognized to be left lateral. Additionally, several east–west trending left-lateral strike-slip faults were found in the middle Taiwan Strait. Based on the MCS data, we found that the changing direction of the strike-slip faults occurred in the middle Taiwan Strait before the formation of Taiwan, and was directly subject to the westward compression from the Philippine Sea Plate and the relative plate motion of the South China Sea with respect to the Philippine Sea Plate. Several 2.5 km-deep P-wave velocity models in the middle Taiwan Strait were imaged through inversion of refracted and reflected arrivals picked from the OBS data. At the boundary between the forebulge and foredeep, as well as within the sediment layers beneath the BU, a significant velocity gradient of approximately 2 s⁻¹ was observed in both the lateral and vertical directions. Additionally, a fault-induced offset of about 0.2 km was identified in the sedimentary interfaces.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"290 ","pages":"Article 106630"},"PeriodicalIF":2.7,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895151","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":"Scandium and gallium in weathered basalts as unconventional resources","authors":"Mei-Fu Zhou ,&nbsp;Wen Winston Zhao ,&nbsp;Zhenchao Wang ,&nbsp;Min Wang ,&nbsp;Shengbiao Yang ,&nbsp;Lei Meng ,&nbsp;Liang Qi ,&nbsp;Guangfu Xing ,&nbsp;Xiang Li ,&nbsp;Dai Zhou","doi":"10.1016/j.jseaes.2025.106629","DOIUrl":"10.1016/j.jseaes.2025.106629","url":null,"abstract":"<div><div>Being critical metals, both scandium (Sc) and gallium (Ga) are in high demand because of their usage in advanced technologies. Yet economically viable Sc and Ga deposits are scarce in the world. New and alternative resources are now urgently needed to ensure a stable supply. Cenozoic basalts in East China are voluminous and comprise a volcanic belt for more than 4000 km long. These basalts have geochemical affinities of ocean island basalts (OIB) with variably enriched LREE relative to HREE with average contents ∼ 19 ppm Sc, and ∼ 21 ppm Ga. We report here Sc- and Ga-enriched regolith of basalts in the Lei-Qiong region, the southernmost part of this volcanic belt. These basalts are strongly weathered under the tropical climate and regolith profiles range in thickness from a few meters to 30 m. The weathered basalts have Sc and Ga concentrations ranging from 19 to 50 ppm and 18 to 47 ppm, respectively, up to 2 times higher than the fresh protolith. They are also variably enriched in Nb (8.1 to 126 ppm) and Ti (1.3 to 4.9 wt%). Preliminary estimates suggest a minima of ∼ 0.3 million tonnes each of Sc and Ga in the Lei-Qiong region. Thus, the weathered products of basalts are potentially important sources of Sc and Ga. Although present in low concentrations, Sc and Ga of the regolith could be viable sources of these elements due to ever-increasing demand and easy and cost-efficient mining. If combined with Nb and Ti, the regoliths would have more even more values. Therefore, weathered basalts could become a potentially important source of these metals, which could ultimately contribute to the maintenance of a reliable and stable source of Sc and Ga in the future. Such unconventional resources may impact the global commercial aspects of Sc and Ga in the future.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"290 ","pages":"Article 106629"},"PeriodicalIF":2.7,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878766","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":"Oil generation, retention and expulsion processes of the Lucaogou shale in the Junggar Basin: Constraints from improved swelling experiment and basin modelling","authors":"Shuyong Shi,&nbsp;Tian Liang,&nbsp;Yunpeng Wang,&nbsp;Yanrong Zou,&nbsp;Yun Shan,&nbsp;Ping’an Peng","doi":"10.1016/j.jseaes.2025.106628","DOIUrl":"10.1016/j.jseaes.2025.106628","url":null,"abstract":"<div><div>The solubility parameters of generated oil are determined by the relative ratios of different oil fractions and vary significantly at different maturation stages. However, previous swelling experiments based on single solvent could only represent the retention behavior for one of oil fractions, which has influence on the accurate evaluation of oil-retention capacity on residual kerogen. In this study, the kerogen of the Lower Permian Lucaogou (P₁l) shale from the Junggar Basin was used to conduct the closed-system pyrolysis experiments and the kinetic parameters were obtained for the evaluation of oil-generation process. The swelling experiments were also performed to evaluate oil-retention amount on residual kerogen. Unlike previous swelling experiments, we chose the mixture of ethyl acetate and <em>iso</em>-octane as swelling solvents, and adjusted the relative ratios to bring the solubility parameter of each mixture close to the generated oil for each pyrolysis temperature as possible. The kinetic model oil generation-retention-expulsion (GRE model) was established based on the results of pyrolysis and swelling experiments. This kinetic model showed that the generated oil of the Lucaogou shale started to expel from the shale when the thermal maturity reached 0.92 %. Furthermore, the GRE model was applied to recover oil generation, retention and expulsion processes of the shale by PetroMod software. The results showed that the generated oil started to expel from the shale at the Late Jurassic (approximately 150 Ma). The current masses of generated, retained and expelled oil of the shale are 12.3, 6.3 and 6.0 × 10⁶ tons/km², respectively.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"289 ","pages":"Article 106628"},"PeriodicalIF":2.7,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874040","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":"Crustal anisotropy and deformation in the South China Block","authors":"Longchun Qian ,&nbsp;Jianshe Lei ,&nbsp;Dapeng Zhao","doi":"10.1016/j.jseaes.2025.106627","DOIUrl":"10.1016/j.jseaes.2025.106627","url":null,"abstract":"<div><div>The South China Block has experienced complex tectonic evolution. To better understand the pattern and causes of its crustal deformation, we investigate crustal anisotropy using Pms receiver functions derived from teleseismic waveforms recorded at 64 permanent stations of the China Earthquake Networks Center. We obtain anisotropic results at 55 stations in the region. Our results show that the fast wave direction (FWD) is NE-SW in the Jiangnan Orogenic Belt and NNE-SSW in the northern Cathaysia Block, which align with the local tectonic belts, likely reflecting lithospheric extension related to subduction of the Paleo-Pacific Plate. South of ∼28°N in the Cathaysia Block, the FWD is nearly E-W, possibly controlled by the regional stress regime. In the Yangtze River Delta, the FWDs are more variable and predominantly NE-SW and NW-SE, which likely reflect crosscutting fault systems formed during the Paleo-Pacific subduction since the late Permian and mid-to-late Cenozoic tectonic movements. As a whole, the major cause of the crustal deformation in the eastern South China Block is extension associated with the subduction and rollback of the Paleo-Pacific Plate, with additional contributions from the northeastward compression of the Indochina Block, the collision between the South China and North China blocks, as well as the subduction of the Pacific and Philippine Sea plates.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"289 ","pages":"Article 106627"},"PeriodicalIF":2.7,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870626","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":"Texture and geochemistry of magnetite from the Jinshandian deposit, eastern China: Implications for the formation of high-grade Fe ore in skarn system","authors":"Qiaoqiao Zhu,&nbsp;Guiqing Xie,&nbsp;Qian Wang,&nbsp;Kejun Hou,&nbsp;Lifan Lu","doi":"10.1016/j.jseaes.2025.106624","DOIUrl":"10.1016/j.jseaes.2025.106624","url":null,"abstract":"<div><div>Iron skarn deposits represent significant sources of high-grade Fe ores, although the mechanisms underlying their efficient enrichment in Fe are not yet fully understood. To investigate the enrichment processes of Fe in the skarn system, texture and geochemistry of magnetite from the Jinshandian Fe deposit located in eastern China were analyzed. Disseminated, friable, and massive ore types are identified at Jinshandian. The friable ore is characterized by loose structure, with minimal or absent cementation minerals interspersed among subhedral to euhedral magnetite crystals. The magnetite at Jinshandian displays significant textural heterogeneity, highlighted by macro- and nanoscale inclusions. Overgrowth and dissolution-reprecipitation (DRP) textures were locally recorded in magnetite. Magnetite grains contains low concentrations of Ti and V, alongside relatively higher Mg, Si, and (Ca+) Al+Mn. Most magnetite grains fall within the skarn field when plotted on geochemical discriminant diagrams. These findings, in conjunction with robust geological evidence, suggest that the Jinshandian deposit originates from intense water–rock interactions. The trace elements in magnetite from the friable ore exhibit similarities to those in disseminated and massive ores, indicating that the friable ore likely formed through a structural softening process that removed soluble cementing minerals (e.g., anhydrite/gypsum and calcite) from the disseminated or massive ore. A comparative analysis of Fe skarn deposits in the Edong district suggests that multiple mechanisms, including accumulation, structural softening, DRP, and superposition processes, may have significantly contributed to the formation of high-grade Fe ores within the skarn system, despite the primary controlling factors varying from one deposit to another.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"290 ","pages":"Article 106624"},"PeriodicalIF":2.7,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877528","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":"Kinematic flow and temperature variation within the Three Pagodas shear Zone, western Thailand","authors":"Sittiporn Kongsukho,&nbsp;Pitsanupong Kanjanapayont","doi":"10.1016/j.jseaes.2025.106572","DOIUrl":"10.1016/j.jseaes.2025.106572","url":null,"abstract":"<div><div>The deformation of mineral grains in mylonitic rocks enables the direct calculation of strain patterns, vorticity analysis, and deformation temperatures in the shear zones. Quartzite mylonite rocks from the Three Pagodas shear zone, western Thailand, were analyzed for finite strain, flow vorticity, and estimate deformation temperatures. Our results indicate deformation temperatures ranging from 510 °C to 570 °C in the central zone, and from 320 °C to 450 °C in the western and eastern zones. The finite strain (R_s) varied from 1.86 to 2.63. Mean kinematic vorticity number (W_m) was determined using two different methods—the porphyroclast aspect ratio (PAR) and the rigid grain net (RGN). W_m values ranged from 0.80 to 0.90, with 59 % to 71 % simple shear and 29 % to 41 % pure shear. A comparison of these zones suggests a transition in strain variation from the eastern to the western zones, with a noticeable increase in strain approaching the central zone. The S values ranged from 0.57 to 0.65 in the western zone, 0.70 to 0.75 in the central zone, and 0.65 to 0.72 in the eastern zone. Our findings confirm that the internal structure of the Three Pagodas shear zone exhibits the heterogeneous distribution, demonstrating sinistral transpressional slip with strain partitioning of general shear and distributed simple shear components at the center of the shear zone. The exhumation and cooling of the Thabsila metamorphic complex were likely influenced by two distinct phases of the India-Eurasia collision during the Early Cenozoic: Early Eocene transpression followed by Late Eocene–Early Oligocene strike-slip deformation.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"289 ","pages":"Article 106572"},"PeriodicalIF":2.7,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850596","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}