Journal of Asian Earth Sciences最新文献

{"title":"Heterogeneous pumice populations of the 52 ± 3 ka Maninjau caldera-forming eruption, West Sumatra, Indonesia: Evidence of multiple magma reservoirs feeding a large silicic eruption","authors":"Indranova Suhendro ,&nbsp;Atsushi Toramaru ,&nbsp;Agung Harijoko ,&nbsp;Haryo Edi Wibowo","doi":"10.1016/j.jseaes.2024.106332","DOIUrl":"10.1016/j.jseaes.2024.106332","url":null,"abstract":"<div><p>Three color variations of grey members (including grey and banded juvenile clasts) were observed in the 52 ka ignimbrite deposits of Maninjau caldera, Indonesia; namely dark grey (DGM), pale grey (PGM), and light grey (LGM). All grey members were phenocryst-rich ( 24, 20, and 31 % for DGM, PGM, and LGM, respectively) and comprise plagioclase, pyroxene, amphibole, biotite, and oxides as the main phenocryst phases; however, apatite is exclusively present in DGM. Plagioclase with unzoned and coarsely sieved texture was observed in all grey members, while finely sieved and oscillatory zoned textures were exclusive in LGM. Notably, DGM is characterized by the highest MgO value among all grey members, followed by PGM and LGM (∼0.72, 0.46, and 0.34 wt% MgO under ∼74.0 wt% SiO₂, respectively). Based on the amphibole geothermobarometer and plagioclase hygrometer, we found that all grey magmas were stored at a relatively similar range of pressure and water content, but DGM yields a higher apparent temperature than those of PGM and LGM. Such distinctive petrography and chemical characteristics, coupled with different temperature conditions strongly suggest that each grey member originated from different magma bodies, which were stored below the most voluminous white magma (the source of white pumice). The sudden decompression of the white magma via overpressure causes destabilization to the smaller grey magmatic bodies, allowing them to rise and erupt as grey and banded pumices during the final eruption stage. Our results enrich the evidence of the formation of multiple magma reservoirs in large-silicic magmatic systems, which might be a common behavior before large eruptions. Moreover, our detailed glass compositions for each juvenile type may be useful for further regional tephrochronology studies.</p></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"276 ","pages":"Article 106332"},"PeriodicalIF":2.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270989","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":"Hydrogen loss from pyroxene within granulite xenoliths at Damaping, North China craton","authors":"Zhuo-Yue Li,&nbsp;Yong-Feng Wang,&nbsp;Jun-Feng Zhang","doi":"10.1016/j.jseaes.2024.106331","DOIUrl":"10.1016/j.jseaes.2024.106331","url":null,"abstract":"<div><div>The preservation of original water contents within nominally anhydrous minerals is essential for understanding the deep Earth’s water budget. Here we present a comprehensive analysis of mineral chemistry and Fourier transform infrared spectroscopy on 15 lower-crustal granulite xenoliths collected from Damaping in the North China craton. Our analyses reveal that the orthopyroxene grains from two samples exhibit hydrogen-deficient rims, suggestive of hydrogen loss. Drawing upon experimentally determined hydrogen diffusivity in pyroxene, we propose that clinopyroxene, despite the absence of evident hydrogen zoning, may have likewise undergone partial hydrogen depletion. Our findings call into question the conventional belief that hydrogen concentrations in pyroxene are faithful proxies for the original water content in the continental lower crust. We attribute the loss of hydrogen in pyroxene to magmatic outgassing, most likely occurring during the surface flow stage. Such a process could partially explain the relatively lower water contents documented in the granulite xenoliths when compared to those found in the Precambrian granulite terranes from the North China craton. Considering recent studies on mantle xenoliths, it becomes evident that both basalt-hosted mantle and lower-crustal xenoliths may have experienced partial loss of their original water contents within the deep Earth.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"276 ","pages":"Article 106331"},"PeriodicalIF":2.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312566","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":"Weathering and pedogenesis of the Holocene aeolian loess-paleosol sections in the Guanzhong Basin on the Chinese Loess Plateau","authors":"Yan Zhu ,&nbsp;Yuzhu Zhang ,&nbsp;Ninglian Wang ,&nbsp;Shuheng Li ,&nbsp;Menglei Wu ,&nbsp;Yanfeng Li ,&nbsp;Jianxi Li ,&nbsp;Jiangli Pang ,&nbsp;Yao Jin ,&nbsp;Dou Chen ,&nbsp;Qili Xiao ,&nbsp;Pengpeng Cao ,&nbsp;Mengting Li ,&nbsp;Jinpeng Zhou ,&nbsp;Jiahui Wang ,&nbsp;Shodmonov Anvar Akramovich","doi":"10.1016/j.jseaes.2024.106334","DOIUrl":"10.1016/j.jseaes.2024.106334","url":null,"abstract":"<div><div>The aeolian loess-paleosol sections on the Chinese Loess Plateau (CLP) represent invaluable archives for elucidating the dynamics of the East Asian Monsoon (EAM) across Quaternary glacial-interglacial cycles. In this study, a Holocene aeolian loess-paleosol section in the Guanzhong Basin on the CLP was meticulously investigated to assess the intensity of weathering and pedogenesis, and to discern its paleoclimatic implications. Through comprehensive analysis of chemical element composition and micromorphology, it was revealed that the majority of stratigraphic units within the Holocene aeolian loess-paleosol section exhibit indications of weak weathering and pedogenesis, while the mid-Holocene paleosol approaches to moderate weathering and pedogenesis. Hierarchically, the intensity of weathering and pedogenesis among the stratigraphic units can be ranked as follows: paleosol &gt; topsoil &gt; recent loess &gt; transitional loess. Furthermore, the chemical index of alteration (CIA) values of the mid-Holocene paleosol exhibit a gradient decline from southeast to northwest, aligning with present-day temperature and precipitation distributions under the predominant influence of the East Asian summer Monsoon (EASM). Thus, it can be inferred that the robust impact of the EASM on weathering and pedogenesis of paleosol was pronounced during the mid-Holocene Climatic Optimum. These results are of significance in exploring the Holocene weathering and pedogenesis and paleoenvironmental evolution on the CLP.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"276 ","pages":"Article 106334"},"PeriodicalIF":2.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312568","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":"Tectonic and climatic controls on topographic spatial variability across the Pamir Plateau and implications for drainage evolution","authors":"Shenqiang Chen,&nbsp;Marie-Luce Chevalier,&nbsp;Haibing Li","doi":"10.1016/j.jseaes.2024.106333","DOIUrl":"10.1016/j.jseaes.2024.106333","url":null,"abstract":"<div><p>The Pamir Plateau, NW prolongation of the Tibetan Plateau, experienced late Cenozoic thrusting and extensional shearing/faulting and mainly receives moisture from the mid-latitude Westerlies. Thus, this region provides a natural laboratory to study how tectonic activity and climate impact topography. In this study, we extracted geomorphic indices from digital elevation model data, including local relief, normalized channel steepness index (<em>k_sn</em>), river longitudinal and <em>χ</em> profiles, as well as cross-valley profiles, to reveal the topographic variations across the Pamir Plateau, and to analyze the effects of tectonic activity and climate on its topography. Because the upper reaches of the Panj, Ghez, and Tashkurgan river catchments, and the Karakul Lake endorheic catchment are located in extremely low precipitation regions and dominantly result from late Cenozoic crustal extension, they generally have low local relief and <em>k_sn</em> values, gentle gradients on the <em>χ</em>-elevation plots, and wide valleys, especially along the intermontane basins. By contrast, the lower reaches of the Panj, Ghez, and Tashkurgan catchments generally have high local relief and <em>k_sn</em> values, steep gradients on the <em>χ</em>-elevation plots, and narrow V-shaped, deeply-incised valleys. For the lower reaches of the Panj catchment in the western Pamir, this difference is due to relatively high precipitation from the Westerlies, but for those of the Ghez and Tashkurgan catchments in the eastern Pamir, although they receive low precipitation, they cross the footwall of the Kongur Shan normal fault, along which tectonic uplift rates are particularly high. During the past ∼ 25 Ma, the drainage divide between the Panj catchment and the Ghez and Tashkurgan catchments migrated eastwards from the Pamir Plateau interior to its present location along the eastern Pamir Range, driven by high precipitation and erosion to the west.</p></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"276 ","pages":"Article 106333"},"PeriodicalIF":2.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270990","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":"Air-sea CO2 exchange in the western Pacific influenced by monsoon and giant diatom (Ethmodiscus rex) blooms during the last deglaciation","authors":"Huaineng Tang ,&nbsp;Haoran Ye ,&nbsp;Wenqing Yang ,&nbsp;Yikang Huang ,&nbsp;Tiantai Sun ,&nbsp;Yangyuan Ge ,&nbsp;Hongxin Zhang ,&nbsp;Yuqing Sun ,&nbsp;Shanying Lin ,&nbsp;Zhonghui Liu ,&nbsp;Wenhua Li ,&nbsp;Zhouqing Xie","doi":"10.1016/j.jseaes.2024.106335","DOIUrl":"10.1016/j.jseaes.2024.106335","url":null,"abstract":"<div><p>The concentration of atmospheric CO₂ increased rapidly during the last deglaciation due to CO₂ outgassing from oceans. However, records of deglacial surface seawater <em>p</em>CO_2-sw are sparse, hindering our understanding of the process and mechanism of air-sea CO₂ exchange and its influence on glacial-interglacial climate change. Here we reconstructed surface seawater <em>p</em>CO_2-sw for the last deglacial period using carbon isotope composition (δ¹³C) of giant diatom (<em>Ethmodiscus rex</em>) frustules from deep-sea sedimentary core collected in the Philippine Sea, western Pacific. Results showed that air-sea CO₂ was fluctuating in the western Pacific during the last deglaciation. The gradients of air-sea CO₂ are dominated by monsoon and biological productivity. The enhanced East Asian winter Monsoon and shallow thermocline during late Heinrich Stadial 1 maintained equilibrium in the air-sea CO₂ exchange balance. During the Bølling period, enhanced East Asian Summer Monsoon has been observed to accelerate the dissolution of eolian-dust and promoted the growth of <em>Ethmodiscus rex</em>, which has been linked to increased primary productivity and, consequently, the uptake of atmospheric CO₂ in the western Pacific. During the Allerød period, continued enhancement of EASM allowed the Philippine Sea to act as a weak CO₂ source releasing CO₂ to the atmosphere. During the Younger Dryas period, as the EASM weaken and the EAWM strengthen, Δ<em>p</em>CO_2(sw-atm) decreased. Our findings highlight the tropical ocean’s role in deglacial air-sea CO₂ exchange and provide insights into the monsoonal and biological drivers of the processes.</p></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"276 ","pages":"Article 106335"},"PeriodicalIF":2.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270991","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":"Three-dimensional interseismic crustal deformation in the northeastern margin of the Tibetan Plateau using GNSS and InSAR","authors":"Xiaoning Su ,&nbsp;Qinghua Bao ,&nbsp;Zhiyu Gao ,&nbsp;Jiale Huang","doi":"10.1016/j.jseaes.2024.106328","DOIUrl":"10.1016/j.jseaes.2024.106328","url":null,"abstract":"<div><p>The nature of the crustal deformation of the northeastern margin of the Tibetan Plateau is vital for elucidating the expansion mechanism of the plateau. We installed 21 continuous GNSS stations and obtained a horizontal velocity field with high spatial resolution. We also acquired a line-of-sight(LOS)<!--> <!-->velocity field with Sentinel-1 images covering the study area from 2014 to 2022. A multi-scale spherical wavelet method was employed to unify the reference frames of GNSS and InSAR data. After unifying the reference frame, the two data types achieve high consistency. Combining GNSS and InSAR velocities yielded the three-dimensional interseismic velocity field in the northeastern margin of the Tibetan Plateau. Furthermore, we analyzed the crustal deformation characteristics based on the three-dimensional deformation field. The crustal deformation exhibits a pronounced northeastward shift relative to the Ordos block, whereas the interior of the Ordos block remains remarkably stationary, behaving as a rigid unit. The Liupanshan fault is primarily characterized by uplift, devoid of any notable horizontal deformation across the fault. The left-lateral strike-slip mainly characterizes the Haiyuan fault.. The maximum east–west deformation velocity on the southern side of the fault is approximately 3.9 mm/yr, decreasing to about 1.0 mm/yr at the eastern end of the fault. The western segment of the West Qinling fault exhibits a minor east–west motion. Our result provides essential data for further study of the crustal deformation patterns.</p></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"276 ","pages":"Article 106328"},"PeriodicalIF":2.7,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1367912024003237/pdfft?md5=afaa7fcb72a41ff8ff75955ed46919ec&pid=1-s2.0-S1367912024003237-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142239758","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":"Age and provenance of the Baluntai arc-related complex (NW China): Implications for the middle Silurian − Early Carboniferous accretionary tectonics of the Central Tianshan arc in the southern Altaids","authors":"Tongyang Zhao ,&nbsp;Wenjiao Xiao ,&nbsp;Qigui Mao ,&nbsp;Ping Li ,&nbsp;Shuo Yang","doi":"10.1016/j.jseaes.2024.106318","DOIUrl":"10.1016/j.jseaes.2024.106318","url":null,"abstract":"<div><div>The Central Tianshan, in the southern Altaids, is characterized by abundant gneiss–schist complexes. The origins and tectonic affinities of these complexes have been controversial in the past two decades. This systematic detrital zircon study used geological mapping of the Baluntai Complex (BC) in the middle section of the Central Tianshan to address these issues. Geological mapping revealed that the BC is a thrust stack that formed by a series of top-to-north thrust faults. Our 1135 concordant U-Pb detrital zircon dating results suggest that the gneisses, schists, and metasandstones of the BC were formed during the Middle Silurian to Early Carboniferous (ca. 433–346 Ma), rather than the Precambrian, as previously assumed. Detrital zircon age provenance of these samples suggests that they are sourced from a continental arc. Combining our new data, we concluded that the BC was generated in the arc-related basins by the northward subduction of the South Tianshan Ocean and that the Central Tianshan was a typical Japan-type arc in the middle and late Paleozoic.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"276 ","pages":"Article 106318"},"PeriodicalIF":2.7,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1367912024003134/pdfft?md5=0da6a18d1a78be0801438710bb3d7606&pid=1-s2.0-S1367912024003134-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312515","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":"Outer-arc active tectonic deformation off the Nias – Nicobar Trench: Insights from lithospheric stress and seismic slip models","authors":"K. Silpa,&nbsp;Anil Earnest","doi":"10.1016/j.jseaes.2024.106299","DOIUrl":"10.1016/j.jseaes.2024.106299","url":null,"abstract":"<div><p>This study investigates the seismic behavior and deformation characteristics in the outer-arc region off the Nicobar trench using stress inversion and teleseismic finite-fault modeling. The spatial and depth-wise variations in stress field in this region indicate variations in post-seismic deformation scenarios along the arc. The lateral shear, similar to the north Wharton basin, is the major deformational field in the Nicobar segment, favoring earthquake faulting along ∼ESE or ∼NNE nodal planes here. Shallow oblique-normal faulting and deeper oblique-reverse regimes are observed in the Nias region. These observations suggest that the plate bending effects directly influence the ongoing tectonics in the Nias region. Moreover, variations in the stress fields across the arc could be indicative of an uncoupled plate interface. Our finite-fault modeling analysis indicates dominant ∼ESE-WNW fault plane orientations for selected events from this region. This suggests the possibility of faulting within similarly oriented active shear structures within the northern Wharton Basin, contrasting the prevailing ∼N-S faulting pattern in that area. Besides, the centroid depths of most of these earthquakes are typically within the 600°C isotherm. However, the seismic slip may extend deeper by rupturing the crust, occasionally reaching upper mantle depths.</p></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"276 ","pages":"Article 106299"},"PeriodicalIF":2.7,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142171997","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":"The attenuation mechanism of high-frequency seismic waves in the Palghar swarm earthquake source area in Western India","authors":"Nampally Subhadra,&nbsp;Mandadi Shekar","doi":"10.1016/j.jseaes.2024.106306","DOIUrl":"10.1016/j.jseaes.2024.106306","url":null,"abstract":"<div><p>We study attenuation of seismic waves in the source area of Palghar swarm in western part of India. The intrinsic and scattering loss are separated using the Wennerberg method in the assumption of co-located source and receiver. The coda-normalization and single back-scattering model of coda wave generation are used for determining <em>Q</em> factors describing attenuation for body (<em>Q</em>_P and <em>Q</em>_S) and coda (<em>Q</em>_C) wave, respectively. The data set includes 1419 high-quality earthquakes (1.5 &lt; M_L&lt;4.7) during intense swarm from 2019 to 2022 recorded by six stations in the Palghar region. Analysis is performed at five central frequencies 1.5, 3, 6, 12, and 24 Hz for varying lapse time windows of 5 to 40 s. The frequency-dependent P- and S-wave attenuations are expressed as <span><math><mrow><msup><mrow><msub><mi>Q</mi><mi>P</mi></msub><mo>=</mo><mrow><mfenced><mrow><mn>8.7</mn><mo>±</mo><mn>1</mn></mrow></mfenced></mrow><mi>f</mi></mrow><mrow><mfenced><mrow><mn>0.85</mn><mo>±</mo><mn>0.01</mn></mrow></mfenced></mrow></msup></mrow></math></span> and <span><math><mrow><msup><mrow><msub><mi>Q</mi><mi>S</mi></msub><mo>=</mo><mrow><mfenced><mrow><mn>28.4</mn><mo>±</mo><mn>0.4</mn></mrow></mfenced></mrow><mi>f</mi></mrow><mrow><mfenced><mrow><mn>0.87</mn><mo>±</mo><mn>0.004</mn></mrow></mfenced></mrow></msup></mrow></math></span>, respectively in 1.5–24 Hz. The spatially averaged frequency-dependent coda <em>Q</em>_C(<em>f</em>) relations are <span><math><mrow><msup><mrow><msub><mi>Q</mi><mi>C</mi></msub><mo>=</mo><mrow><mfenced><mrow><mn>26.9</mn><mo>±</mo><mn>13</mn></mrow></mfenced></mrow><mi>f</mi></mrow><mrow><mfenced><mrow><mn>0.93</mn><mo>±</mo><mn>0.04</mn></mrow></mfenced></mrow></msup></mrow></math></span> and <span><math><mrow><msup><mrow><msub><mi>Q</mi><mi>C</mi></msub><mo>=</mo><mrow><mfenced><mrow><mn>138.8</mn><mo>±</mo><mn>41</mn></mrow></mfenced></mrow><mi>f</mi></mrow><mrow><mfenced><mrow><mn>1.08</mn><mo>±</mo><mn>0.05</mn></mrow></mfenced></mrow></msup></mrow></math></span> for 5 and 40 s, respectively. The S-waves attenuate faster than the coda waves in 1.5–24 Hz. The <em>Q_P/Q_S</em> ratio is greater than unity in the analysed frequencies. Intrinsic attenuation dominates the scattering attenuation in the whole frequency range. Dominant intrinsic absorption with its strong frequency dependence requires the presence of fluids in the shallow crust, as shown from other geophysical methods in the Palghar swarm area. Attenuation mechanisms are found to be similar for other swarm areas worldwide. The attenuation results could be useful while finding the earthquake source parameters to correct the path in the modelling for accurately estimating source scaling relations of swarm-related earthquakes.</p></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"276 ","pages":"Article 106306"},"PeriodicalIF":2.7,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150216","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":"Spatial variations in the effective elastic thickness of the Indian Ocean lithosphere","authors":"Ademolawa John Afelumo ,&nbsp;Chun-Feng Li ,&nbsp;Opeyemi Joshua Akinrinade ,&nbsp;Charles Izuma Addey ,&nbsp;Fabio Antonio Capitanio","doi":"10.1016/j.jseaes.2024.106315","DOIUrl":"10.1016/j.jseaes.2024.106315","url":null,"abstract":"<div><p>The Indian Ocean lithosphere is a complex assemblage of large igneous provinces, seamounts, plateaus and ridges of different loading ages and tectono-thermal evolution. As a proxy for the strength of tectonic plates, effective elastic thickness (<em>T_e</em>) illustrates the relationship between surface deformation and lithospheric rheology of the diverse provinces in response to long-term tectonic processes. Mapping the spatial variations in lithospheric rheology can aid in understanding the detailed tectono-thermal history of the Indian Ocean. In this paper, we perform an assessment of the spatial variation of <em>T_e</em> for the Indian Ocean from the inversion of the real free-air admittance between free-air gravity anomalies and bathymetry corrected for the effect of density variations within sediments using a continuous wavelet spectral analysis. Incorporating the effect of sediments substantially reduces <em>T_e</em> estimates and better corresponds with the tectonic units in the study region. The results show low overall <em>T_e</em> over the Indian Ocean attributed to magmatism and temperature during a multistage opening process. We further demonstrate that temperature controls the strength of warm and young oceanic lithosphere, evidenced by the positive correlation between <em>T_e</em> and geothermal proxies. Finally, moderately low <em>T_e</em> values at the Southwest Indian Ridge suggest a relatively cold ultraslow lithosphere with sparse magmatism compared to typical mid-ocean ridges.</p></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"276 ","pages":"Article 106315"},"PeriodicalIF":2.7,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137460","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}