Solid Earth Sciences最新文献

{"title":"Petrogenesis of post-collisional mesozonal enderbite in the Proterozoic Chhotanagpur Gneissic Complex, Eastern India: Implications of slab-break-off","authors":"Poulami Roy,&nbsp;Bapi Goswami,&nbsp;Ankita Basak,&nbsp;Chittaranjan Bhattacharyya","doi":"10.1016/j.sesci.2024.100217","DOIUrl":"10.1016/j.sesci.2024.100217","url":null,"abstract":"<div><div>Collisional orogeny produces large volumes of tonalitic melts at two stages: first, during the oceanic subduction below the continent (continental arc), and again, during the post-collisional stage. In a polydeformed and polymetamorphosed terrain, it would be challenging to distinguish between arc tonalites and post-collisional tonalites (and their metamorphosed equivalents, enderbites). The Chhotanagpur Gneissic Complex (CGC) belongs to the EW to ENE-WSW tending, 1500 km long Grenvillian collisional belt amalgamating the North and South Indian cratonic blocks. We discuss the field disposition, petrography, mineral chemistry, geochemistry, the physical condition of crystallization and metamorphism, and the petrogenetic model of enderbites from the CGC. Enderbites sporadically occur as cm-to-dm-thick leucosomal bands in migmatitic gneisses (migmatitic enderbites) and as small stock-sized plutons (massive enderbites) intruding migmatitic gneisses. Both of these types intruded before the end of the regional deformation. Both the massive and migmatitic enderbites predominantly contain plagioclase, quartz, biotite (with a higher abundance in the migmatitic type), minor orthopyroxene, clinopyroxene, hornblende, K-feldspar, and accessories such as opaque minerals, apatite, and zircon. Garnets rarely occur in migmatitic enderbites. Thermodynamic modeling suggests a low liquidus temperature (∼750 °C), intermediate pressure of emplacement (∼5.5 kb), moderate oxygen fugacity (ΔQFM = +1 to +2), and low water (∼4.0 wt%) of the parental tonalite magma. The two enderbite types have been derived from two distinct crustal (amphibolites) sources by water-fluxed partial melting at &lt;10 kb pressure, shallower than the garnet stability field. About 20–40 % of batch-melting of shoshonitic basaltic sources yielded migmatitic enderbites, while about 40–70 % of batch-melting of within-plate basaltic sources produced massive enderbites. Discrimination diagrams display a post-collision tectonic setting of these enderbites. The migmatitic enderbites and magma of enderbite plutons formed during regional anatexis due to thermal relaxation in the lower crust after attaining peak pressure during the decompressive phase of regional granulite facies metamorphism (1000–950 Ma) related to slab breakoff at the post-collisional stage of the orogeny. Mantle-derived magmas formed by adiabatic decompression in the upper mantle supplied the heat.</div></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 4","pages":"Article 100217"},"PeriodicalIF":2.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Late Ordovician amphibolites in the Taoxinghu area of central Qiangtang, northern Tibet, and their tectonic significance","authors":"Shuangfei Han ,&nbsp;Xijun Liu ,&nbsp;Haodong Wei ,&nbsp;Yaoming Wei ,&nbsp;Yao Xiao ,&nbsp;Zhiguo Zhang","doi":"10.1016/j.sesci.2024.100216","DOIUrl":"10.1016/j.sesci.2024.100216","url":null,"abstract":"<div><div>The early Paleozoic tectonic evolution of the Qinghai-Tibetan Plateau remains not fully understood. The Longmu Co-Shuanghu Suture Zone within the Qiangtang block of northern Qinghai-Tibetan Plateau, records important evidence of the early Paleozoic evolutionary history of the plateau. In this study, we investigated early Paleozoic amphibolites exposed in the Taoxinghu area of central Qiangtang, using zircon U–Pb dating, mineral chemistry, whole-rock geochemistry, and zircon Hf–O isotopes. The objective was to identify the characteristics of the protoliths and the metamorphic processes. Two types of zircons with different characteristics occur in the amphibolites, yielding zircon U–Pb ages of 490 and 440 Ma attained using kernel density estimation, which represent the ages of the protolith and subsequent metamorphism, respectively. The amphibolites have SiO₂ (42.4–55.7 wt.%), and Al₂O₃ (14.4–18.7 wt.%) and MgO (3.62–8.80 wt.%) contents. Their geochemical characteristics show large ion lithophile elements enriched and high field strength elements depleted. The zircon U–Pb age and rock geochemical data suggest the protoliths of the amphibolites were late Cambrian supra-subduction zone-type ophiolites that organized in association with Proto-Tethyan subduction. The subsequent Late Ordovician metamorphic event might be associated with the collision between continental blocks after oceanic closure. We favor that amphibolites provide essential constraints on the early Paleozoic tectonic evolutionary history of the Qinghai-Tibetan Plateau.</div></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 4","pages":"Article 100216"},"PeriodicalIF":2.0,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Reappraising the eruptive history of the Alchichica Maar Volcano (Mexico) based on Sr–Nd isotopes: Understanding the role of the magma source region on the growth of small-volume volcanoes","authors":"Boris Chako-Tchamabé ,&nbsp;Bodo Weber ,&nbsp;Merlin Gountié Dedzo ,&nbsp;Jules Tamen ,&nbsp;Jhoanna Silis-Esquivel ,&nbsp;Karoly Nemeth","doi":"10.1016/j.sesci.2024.100214","DOIUrl":"10.1016/j.sesci.2024.100214","url":null,"abstract":"<div><div>Alchichica Maar is in the eastern sector of the Trans-Mexican Volcanic Belt, where volcanics range from basalts to rhyolites, with ⁸⁷Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd values between 0.70293 to 0.70447 (εSr = −21.1 to −4.5) and 0.512733 to 0.512949 (εNd = +3.4 to +6.2), respectively. In this study, Nd and Sr isotopic data and new major and trace elements compositions are provided for the lava flow, the scoria cone, and the phreatomagmatic deposits composing Alchichica Maar Volcano. These results are used in combination with published data to reexamine its eruptive history, though to be formed by more than one eruptive event. The cogeneticy of the magmas that fed the eruptions of these deposits is examined to infer the role of the deep magma source region and post-magmatic alterations on the construction of the Alchichica Maar magmatic system. Alchichica samples present ⁸⁷Sr/⁸⁶Sr values between 0.70387 and 0.70447 (εSr = −9.0 to −0.4) and ¹⁴³Nd/¹⁴⁴Nd values from 0.512749 to 0.512773 (εNd = +2.0 to +2.8). While the ⁸⁷Sr/⁸⁶Sr values suggest a slight increment in radiogenic ⁸⁷Sr from the pre-maar lower lava flow to the upper maar eruptions indicative of magma contamination within the upper crust and by hydrodynamic mingling during the phreatomagmatic phases, the slight variation in Nd isotopes suggest an overall homogeneous source where small batches of magmas formed episodically to feed monogenetic eruptions, which subsequently yielded the pre-maar lava flow, the pre-maar surge, the scoria cone, and the maar units. This study reinforces the idea that an already “tapped” source region of a monogenetic volcano may become fertile again, and new eruptions can occur from near or old vent sites. It also highlights the hazardous potential of small-volume volcanoes.</div></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 4","pages":"Article 100214"},"PeriodicalIF":2.0,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Petrology of the Pan-African high-K alkali-calcic Bocaranga plutonic complex in the Adamawa-Yadé domain (Central African Republic): Nature, origin and contribution to geodynamic reconstruction of the Central African fold belt","authors":"Rodrigue Martial Topien ,&nbsp;Jules Tcheumenak Kouémo ,&nbsp;José Kpéou ,&nbsp;Gaetan Moloto-A-Kenguemba ,&nbsp;Maurice Kwékam","doi":"10.1016/j.sesci.2024.100211","DOIUrl":"10.1016/j.sesci.2024.100211","url":null,"abstract":"<div><div>The Bocaranga plutonic complex belongs to the northwestern extension Adamawa-Yadé Domain of the Central African Fold Belt (CAFB) in the Central African Republic (CAR). Six petrographical units are recorded in the Bocaranga plutonic complex: (i) a coarse-grained biotite granite, (ii) hornblende-biotite granite, (iii) fine-grained biotite granite, and (iv) two micas granite emplaced in Pan-African metamorphic basement rocks composed of (v) gneisses and (vi) amphibolites. Their chemical compositions are similar to quartz monzonites, monzogranite, syenogranite and alkali granite, respectively. The pluton rocks are metaluminous to weakly peraluminous I-type granitoids, hornblende-biotite granite are magnesian and high-K alkaline, while grained biotite granite and fine-grained biotite granite are ferroan, alkalic-calcic and shoshonitic, whereas the two micas granite are weakly to strongly peraluminous and calc-alkaline. The evolution of the major elements (Al₂O₃ and CaO) and some trace elements (Sr) suggest that fractional crystallization controlled by plagioclase is the main magma differenciation process which influenced the magmatic evolution in this plutonic complex. However, the presence of gneiss xenoliths and mafic enclaves within the plutonic complex, combined to the geochemical data, indicate that the Bocaranga plutonic complex is most likely the result of mixing between mantle- and crust-derived magmas, with high crustal implication for coarse-grained biotite granite, fine-grained biotite granite and two micas granite and high mantle one for hornblende-biotite granite. High U–Th content displays by two-mica granite the high REE content display by all the plutonic rocks indicate that these rocks appear to be respectively favourable for mineralisation in the aforemention elements, thus indicating that the Bocaranga area may represents a potential exploration target for U–Th and REE deposits. The Bocaranga plutonic complex is a synkinematic pluton whose emplacement is synchronuous to the D₂ ductile deformation phase related to linear lithospheric delamination along the MBéré Shear Zone around 620-550 Ma during the late-to post-collisional history the Pan-African orogeny. Such granitic plutons are common in the Orogenic Belt of Central Africa and the Brasiliano Belt.</div></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 4","pages":"Article 100211"},"PeriodicalIF":2.0,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Compilation of fundamental parameters of earth","authors":"Sirui Liu ,&nbsp;Jianghong Deng","doi":"10.1016/j.sesci.2024.100202","DOIUrl":"10.1016/j.sesci.2024.100202","url":null,"abstract":"<div><div>Earth is a unique planet in the universe characterized by a stable crust and a dynamic internal environment, fostering intelligent life. Studying Earth not only aids in understanding our habitat but also helps uncover mysteries of other celestial bodies. Earth parameter data are essential for a comprehensive understanding of the planet. Here we compile and update key data on Earth's fundamental parameters, historical evolution, and the current geophysical parameters and geochemical compositions of its atmosphere, water, crust, mantle, and core. The data are sourced from a combination of historical records, satellite observations, and recent field studies, and have been validated using established geophysical and geochemical methodologies. We specifically examine the elemental compositions of various Earth layers and offer recommended values for certain datasets, aiming at easier accessing fundamental Earth data, thereby facilitating deeper exploration of Earth sciences.</div></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 4","pages":"Article 100202"},"PeriodicalIF":2.0,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142328048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"ECO: A new reference model of dry olivine electrical conductivity","authors":"Xiaozhi Yang","doi":"10.1016/j.sesci.2024.100193","DOIUrl":"10.1016/j.sesci.2024.100193","url":null,"abstract":"<div><p>Electrically Conductive Olivine, ECO, is presented as a new reference model for the electrical conductivity of dry olivine. The model takes into account the prevailing redox state, temperature and pressure in the upper mantle, as well as their effects on the conductivity, and is based on conductivity analyses of dry single crystal olivine at high pressures. The model demonstrates higher conductivity of olivine than those previously proposed standard olivine models, which rely on the conductivity of olivine measured at room pressure. Accepting that the bulk electrical structure is in general dominated by olivine, the upper mantle is more conductive than the estimates of the previous models. The olivine conductivity is in fact high at the oxidizing conditions of the shallow mantle, but drops at greater depths where the mantle portion is reducing. The model provides a new reference basis for understanding the electrical structure of the upper mantle, and is important for invoking any other conductive candidates to explain enhanced mantle conductivity.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 4","pages":"Article 100193"},"PeriodicalIF":2.0,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X2400031X/pdfft?md5=ffdfa2e9386bbd8f182c93bdd0f4c146&pid=1-s2.0-S2451912X2400031X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"High-precision measurement of trace-level Nb, Sn, Ta, and W in rutile using electron probe microanalysis","authors":"Peng-Li He,&nbsp;Xiao-Long Huang,&nbsp;Le Zhang","doi":"10.1016/j.sesci.2024.100197","DOIUrl":"10.1016/j.sesci.2024.100197","url":null,"abstract":"<div><p>The composition of Nb, Sn, Ta, and W in rutile can serve as a highly sensitive indicator for the mineralization of these elements. This information could also be utilized to discriminate different stages of ore deposition or distinct types of deposits. Precise and accurate measurement of trace-level concentrations of these elements in rutile is imperative for such investigations, and can be effectively achieved using electron probe microanalysis (EPMA). In this study, we employed a CAMECA SX5 field emission EPMA to develop an optimal approach for precise and accurate analysis of trace-level Nb, Sn, Ta, and W in rutile. The analytical conditions include an accelerating voltage of 25 kV, a beam current of 200 nA, a beam diameter of 1 μm, optimized background positions for Nb Lα, Sn Lα, Ta Lα, and W Lα, and aggregate intensity counting with a peak counting time of 240 s for each element per spectrometer. The detection limits (3σ) for Nb, Sn, Ta, and W ranged from 22 to 53 ppm. The highest achievable spatial resolution was approximately 4.3 μm. Analytical results obtained from potential rutile standards R10 and R632 were consistent with previous studies within the errors. The precision of these results varied from 1% to 10% (1σ), excluding W in R10 and Nb and Ta in R632, which exceeds the precision achieved in previous EPMA studies. We recommend using R10 as a reference standard for analyses of trace-level Nb, Sn, and Ta, and R632 as an appropriate reference standard for Sn and W when quantifying rutile using EPMA.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 3","pages":"Article 100197"},"PeriodicalIF":2.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000357/pdfft?md5=0a0022e566dedf25b48b78b1a087febe&pid=1-s2.0-S2451912X24000357-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142095160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Assessment of groundwater resources through hydrogeochemical investigation and multivariate chemometric statistics in Bagerhat district, Bangladesh","authors":"Sujan Mallik ,&nbsp;Sukhen Goswami ,&nbsp;Dhiman Kumer Roy ,&nbsp;Md Jakir Hossain ,&nbsp;Afroz Jahan ,&nbsp;Ayon Saha ,&nbsp;Abu Reza Md Towfiqul Islam","doi":"10.1016/j.sesci.2024.100200","DOIUrl":"10.1016/j.sesci.2024.100200","url":null,"abstract":"<div><p>Groundwater, a primary freshwater source for potable and agricultural uses, is increasingly threatened in southern coastal areas of Bangladesh because of rapid urbanization, industrialization, and climate change. Bagerhat, one of the coastal districts, faces not only frequent tropical cyclones, inundation of low-lying areas, and saline water intrusion but also rapid urbanization, population growth, and pollution from prawn culture and seafood processing industries. The study aims to assess the hydrogeochemistry and the suitability of groundwater based on its significance for potable and irrigation purposes in Bagerhat District. This research includes an integrated approach of hydrogeochemical, geospatial, and multivariate statistical methods to investigate the hydrogeochemical processes and groundwater quality using ninety groundwater samples from existing deep tube wells (around 350 m depth). The hydrogeochemical analysis determined the concentrations of major cations and anions were Na⁺&gt;Mg²⁺&gt; Ca²⁺&gt; K⁺ and Cl⁻ &gt; HCO₃^- &gt; SO₄²⁻ &gt; NO₃^-, correspondingly. Electrical Conductivity (EC) values ranged from 16,260 μS/cm in the southern Mongla Upazila to a minimum of 560 μS/cm in Chitalmari Upazila. The evaporation–crystallization processes were found to be the primary mechanism influencing groundwater chemistry in the study area. Multivariate statistics, including Pearson correlation matrix, principal component analysis (PCA), and cluster analysis, indicated that geogenic processes govern groundwater chemistry. The spatial distribution of the water quality index (WQI) map demonstrated that only 15% of groundwater samples are suitable for drinking in the central and eastern parts, while 85% are unsuitable in the study area. Furthermore, evaluation of irrigation water quality parameters, such as sodium percentage (Na%), sodium adsorption ratio (SAR), Kelly ratio (KR), permeability index (PI), magnesium hazard (MH), and salinity hazard, indicated that most wells are unsuitable for irrigation. The results provide insights into aquifer hydrogeochemistry, groundwater quality status, vulnerable areas of pollution, and sustainable, safe water options for groundwater management in the Bagerhat district.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 3","pages":"Article 100200"},"PeriodicalIF":2.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000382/pdfft?md5=32e49ae6b1693a3c13c54f7bb6f61b99&pid=1-s2.0-S2451912X24000382-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142149380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"The origin and tectonic implications of the ca. 406 Ma magmatic activity in the western Yangtze Block, South China","authors":"Chun-Mei Liu ,&nbsp;Hao Zou ,&nbsp;Hai-Feng Chen ,&nbsp;Chen-Wei Li ,&nbsp;Nuru Said ,&nbsp;Chang-Cheng Huang ,&nbsp;Xing-Xing Mao ,&nbsp;Hui-Dong Yu ,&nbsp;Hua-Wen Cao ,&nbsp;Xin-Yu Liu","doi":"10.1016/j.sesci.2024.100198","DOIUrl":"10.1016/j.sesci.2024.100198","url":null,"abstract":"<div><p>In this study, we report for the first time a new gabbro diorite, forming in an intraplate extensional environment during the Early Devonian, in the Shimian of the western margin of the Yangtze Block. Zircon SIMS U–Pb dating indicates that the gabbro diorite formed at ca. 406 Ma. This gabbro diorite belongs to low-K tholeiite and has enriched in Rb, Ba, K, Pb, negative anomalies of Nb, Ta, depletion of flat LREE patterns, negative ε_Hf(t) (−1.1 to −11.7), and high δ¹⁸O (8.83 ± 0.21‰) ratios, showing that the magma formed by partial melting of N-MROB-type mantle and indicating that the magma underwent crustal contamination during emplacement. The magma is formed in the extensional environment, which provides evidence for the extensional environment in the western margin of the Yangtze. The geochemical characteristics and emplacement time of the rocks are similar to those in the early Paleozoic post-orogenic mafic rocks in South China, suggesting that the gabbro diorite may be influenced by the early Paleozoic orogeny in South China.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 3","pages":"Article 100198"},"PeriodicalIF":2.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000369/pdfft?md5=41c004e24c85a86347e9cc45fb08a037&pid=1-s2.0-S2451912X24000369-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142117344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"The slab failure in Central Java (Indonesia): New insight into its tectonic setting and origin","authors":"Shaban Godang ,&nbsp;Sugeng Purwo Saputro ,&nbsp;Huan Li","doi":"10.1016/j.sesci.2024.100199","DOIUrl":"10.1016/j.sesci.2024.100199","url":null,"abstract":"<div><p>The geochemical and tectonic characteristics of volcanic formations in Central Java, specifically the Sumbing-Slamet volcanics, were investigated to understand the processes associated with slab failure in the region. Through comprehensive geochemical analysis and comparison with other volcanic formations, insights into the magmatic evolution and tectonic settings of the Sumbing-Slamet volcanics were gained. The findings support the hypothesis of slab tearing beneath Central Java, as evidenced by distinct geochemical signatures and magmatic interactions observed in the Sumbing-Slamet volcanics. Geochemical data reveal medium to high potassium content (K₂O = 0.77–2.32%), low Nb/Y (&lt;0.6561), low TiO₂ relative to Al₂O₃ [TiO₂ &lt; (−1.1610 + 0.1935 × Al₂O₃)], Th/La &gt;0.2, as well as a wide range of Nb/La and Nb/Zr (0.14–0.89 and 0.0304–0.0744, respectively), notable depletions in high-field strength elements (HFSE; such as Nb, Ti), low to high Ta-anomaly (δTa = 0.21–1.03), and whole-rock isotopes of ⁸⁷Sr/⁸⁶Sr (0.704458–0.705800) and ¹⁴³Nd/¹⁴⁴Nd (0.513059–0.512766) demonstrate that they were formed from active continental margin (ACM) tectonics involving subducted sediment input. These magmatic processes likely resulted from the mixing of lithospheric and asthenospheric mantle sources due to slab failure in the northern part of Central Java. The research contributes to strengthening the geophysical view regarding the existence of slab tearing in Central Java, understanding the dynamic geological processes occurring in subduction zones, and emphasizing the importance of interdisciplinary approaches in studying such phenomena.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"9 3","pages":"Article 100199"},"PeriodicalIF":2.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X24000370/pdfft?md5=b60d2415e7471906eb6608946c006767&pid=1-s2.0-S2451912X24000370-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142077453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}