Solid Earth Sciences最新文献

{"title":"Effects of various factors on behaviors of piles and foundation soils due to seismic shaking","authors":"Muhammad Hamzah Fansuri ,&nbsp;Muhsiung Chang ,&nbsp;Pungky Dharma Saputra ,&nbsp;Nina Purwanti ,&nbsp;Anasya Arsita Laksmi ,&nbsp;Sabrina Harahap ,&nbsp;Surya Dewi Puspitasari","doi":"10.1016/j.sesci.2022.09.001","DOIUrl":"10.1016/j.sesci.2022.09.001","url":null,"abstract":"<div><p>Buckling instability has been identified as a possible mechanism of pile failure in liquefiable ground and this failure mechanism is not explicitly mentioned in most of the design codes. Pile buckling would be affected, however, by various factors including liquefaction zone of foundations soils, axial loads of piles, geometry as well as arrangement of pile foundation, etc. An efficient approach using deterministic by Bhattacharya is proposed to compute the buckling instability in pile. This method is verified and validated using 3D finite-element simulation through OpenSeesPL. A more comprehensive study of numerical simulation would include the effects of various factors on the responses of piles and foundations soils due to seismic loading. The findings reported that an increase in axial loading would generally increase the excess pore pressure in soils and would generally increase the deflection and bending moment in piles and acceleration responses in soils. An increase in pile spacing would generally increase the deflection and bending moment in piles, as a result of more soil volume among the piles. An increase in diameter of pile would increase in rigidity and maximum bending capacity of piles and thus would resist more energy released in liquefiable ground that amplifies the deflection (curvature) of pile. A comparison of two approaches confirms the pile would be safe from buckling failure against soil liquefaction during seismic loading. Finally, this study would provide for predicting pile buckling instability and the behaviors of piles and foundation soils due to seismic shaking and liquefied ground.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"7 4","pages":"Pages 252-267"},"PeriodicalIF":2.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000319/pdfft?md5=085b7f8b9ed1ca86c47cb1ef3d12b704&pid=1-s2.0-S2451912X22000319-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43256845","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":"Tectonic-magmatic setting for Early Cretaceous low-sulfidation epithermal gold deposits in the Xing–Meng Orogenic Belt: Constraints from zircon U–Pb and Hf isotopic data of wulaga deposit, NE China","authors":"Yongbin Wang ,&nbsp;Xiaochun Liu ,&nbsp;Yunkang Guo ,&nbsp;Jiaqi Cai ,&nbsp;Qing-dong Zeng","doi":"10.1016/j.sesci.2022.07.002","DOIUrl":"10.1016/j.sesci.2022.07.002","url":null,"abstract":"<div><p>The Xing–Meng Orogenic Belt hosts an amount of low-sulfidation epithermal gold deposits. However, the tectonic-magmatic setting remains problematic, which hinders understanding the factors that control the gold endowment in the region. Wulaga deposit is the largest low-sulfidation epithermal gold deposit in the northeastern Xing–Meng Orogenic Belt. Gold mineralization occurs in the crypto-explosive breccia zone of subvolcanic granodiorite porphyry. Zircon U–Pb ages of three granodiorite apophyses and previous pyrite Rb–Sr dating (113.8 ± 4.4 Ma) indicate granodiorite porphyry and gold mineralization was coeval. The ore-related granodiorite porphyry is moderate SiO₂, high-K calc-alkaline, and metaluminous, suggesting an I-type granite. Moreover, Wulaga granodiorite porphyry displays low initial ⁸⁷Sr/⁸⁶Sr ratios and positive ε_Nd(t) values with T_DM2(Nd) of 799.7–897.4 Ma and ε_Hf(t) values with T_DM2(Hf) of 652–785 Ma, indicating that it was derived from partial melting of the Neoproterozoic juvenile mafic lower crust. Ti-in-zircon thermometry, medium–high Sr/Y ratio, high Ba/La, and <em>f</em>_O2 value indicate that Wulaga granodiorite porphyry formed at relatively low temperatures (∼700 °C), rich water, and high fugacity within the stability field of garnet in the juvenile lower crust. Combined with ore-related tectonic-magmatic activities in the Wulaga, Dong'an, and Sandaowanzi gold deposits, the Early Cretaceous low-sulfidation epithermal gold deposits in the Xing–Meng Orogenic Belt were formed from magmatic-hydrothermal events triggered by mutual interaction between post-orogenic lithospheric extension related to the closure of the Mongol-Okhotsk Ocean and arc-back extension associated with rollback of the Paleo-Pacific Ocean plate. These data indicate the potential existence of the Early Cretaceous epithermal gold deposits that are related to the contemporaneous igneous activity.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"7 4","pages":"Pages 276-295"},"PeriodicalIF":2.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000228/pdfft?md5=abd4b09338108de7960ab7e7bddf254b&pid=1-s2.0-S2451912X22000228-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49100798","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":"Corrigendum to ‘Growth of primordial continents by cycles of oceanic lithosphere subductions: Evidence from tilted seismic anisotropy supported by geochemical and petrological findings’ [Solid Earth Sciences 5 (2020) 50–68/SESCI-D-19-00022]","authors":"Vladislav Babuška ,&nbsp;Jaroslava Plomerová","doi":"10.1016/j.sesci.2022.09.002","DOIUrl":"10.1016/j.sesci.2022.09.002","url":null,"abstract":"","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"7 4","pages":"Pages 296-299"},"PeriodicalIF":2.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000393/pdfft?md5=a76d9e651d611d9ffc87ed4d7b741aa3&pid=1-s2.0-S2451912X22000393-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41710899","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 body of the Bellingshausen Ice Dome as a biogeochemical space","authors":"Timur Nizamutdinov ,&nbsp;Bulat Mavlyudov ,&nbsp;Wenjuan Wang ,&nbsp;Evgeny Abakumov","doi":"10.1016/j.sesci.2022.05.002","DOIUrl":"https://doi.org/10.1016/j.sesci.2022.05.002","url":null,"abstract":"<div><p>The investigation of glacial sediments has not received a lot of attention, but the processes in place on the surface of glaciers are quite interesting and multidirectional. In this article, we focused on glacial sediments material sampled from the surface of the Bellingshausen Ice Dome (King George Island, South Shetland Islands, Antarctica). These sediments have different genesis: material from cryoconite holes, denuded layers of volcanic ash, flushed ash and soils and soil-like bodies formed in the glacial zone. Chemical analysis of the samples showed that the bulk composition of sediments is as follows: SiO₂ &gt; Fe₂O₃ &gt; Al₂O₃ &gt; SO₃ &gt; CaO &gt; MgO &gt; Na₂O &gt; TiO₂ &gt; K₂O &gt; P₂O₅ &gt; MnO (with SiO₂ content 50–55%, Fe₂O₃ – 17–23%, Al₂O₃ – 6–12%). The loss on ignition was maximum (10–11%) for samples taken at the top of the dome. Calculation of geochemical indexes showed that the mineral part of the samples is a product of erosion and sedimentation processes and is less chemically weathered in the lower part of the ice dome. The weathering type is fersiallitic. The maximum content of organogenic compounds (Total organic carbon – up to 5%, ammonium nitrogen – up to 116 mg/kg and mobile potassium – up to 373 mg/kg) also recorded at the top of the glacial dome; this may be associated with microbiological activity in cryoconite holes and the penetration of organic material from bird fauna. The low content of organogenic compounds on the slopes is caused by the processes of their washout with melt water. The content of trace metals Zn, Ni, and Pb found at higher elevations and distribution of Cu and Cd have more a local character associated with tourism activities and anthropogenic influence from year-round scientific stations. Thus, a number of multidirectional processes take place in the glacial sediments on the Bellingshausen Ice Dome, these are not simple denuded layers of ancient volcanic ash. The glacier cover can be considered as a “living” biogeochemical shell, accumulating products of microbiological and anthropogenic activity, products of erosion and sedimentation and organic matter of ornithogenic origin.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"7 3","pages":"Pages 215-236"},"PeriodicalIF":2.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000186/pdfft?md5=8ed428b1dda809e6d360ff3754508086&pid=1-s2.0-S2451912X22000186-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137341829","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 and high-accuracy magnesium isotope analysis on multiple-collector inductively coupled plasma mass spectrometry using a critical mixture double spike technique","authors":"Yongsheng He ,&nbsp;Ai-Ying Sun ,&nbsp;Yin-Chu Zhang ,&nbsp;Ru-Yi Yang ,&nbsp;Shan Ke ,&nbsp;Yang Wang (汪洋) ,&nbsp;Fang-Zhen Teng","doi":"10.1016/j.sesci.2022.05.001","DOIUrl":"10.1016/j.sesci.2022.05.001","url":null,"abstract":"<div><p>A new procedure has been developed for high precision and high accuracy Mg isotope analysis on multiple-collector inductively coupled plasma mass spectrometry using a critical mixture double spike technique. Errors arising from improper preparation of the critical double spike solutions are able to be corrected against the regression on a set of over- and under-spiked standards. Accuracy is ensured by correcting mass bias offset based on Monte Carlo calculations. Doping experiments indicate that the double spike method is robust to non-spectrum matrix effects. A long-term precision and accuracy of ±0.03‰ (2SD) was demonstrated for δ²⁶Mg by replicate analyses of well-characterized in-house pure Mg solutions and synthetic samples passed through the column chemistry, provided that each sample was measured four times. The robustness of the method was further assessed by replicate analyses of fifteen geological reference materials ranging from peridotite, basalt, granodiorite, carbonatite to seawater. Rock standards yielded consistently higher δ²⁶Mg by 0.076 ± 0.052‰ (2SD, N = 12) compared to data previously reported by standard-sample-bracketing from the same lab. This discrepancy might result from the difficulty in matching the matrices of natural samples exactly the same to the bracketing standards, even after purification, suggesting a careful evaluation on residual matrix effect for the standard-sampling-bracketing method. Our new data for geological reference materials serve as a reference for quality assessment and inter-laboratory comparison in future studies.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"7 3","pages":"Pages 188-199"},"PeriodicalIF":2.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000174/pdfft?md5=87d2de44088b4dc645a46ec020d52dca&pid=1-s2.0-S2451912X22000174-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43790021","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":"Trace elements geochemistry, total organic carbon, palaeosalinity, and hydrothermal characteristics of the Cretaceous black shale in the Mamfe Basin (West Africa)","authors":"Bokanda Ekoko Eric ,&nbsp;Philip Fralick ,&nbsp;Bisse Salomon Betrant ,&nbsp;Ashukem Ethel Nkongho ,&nbsp;Belinga Belinga Cedric ,&nbsp;Bokanda Frankline Besonge ,&nbsp;Ligbwah Victor Wotanie ,&nbsp;Chin Thiery Berinyuy ,&nbsp;Ekomane Emile","doi":"10.1016/j.sesci.2022.07.001","DOIUrl":"10.1016/j.sesci.2022.07.001","url":null,"abstract":"<div><p>The shales of the Mamfe basin were geochemically analyzed to determine their paleosalinity and hydrothermal characteristics which existed at the time of their deposition. Elemental ratios such as boron/gallium (B/Ga), strontium/barium (Sr/Ba), and total sulphur/total organic carbon (S/TOC) and TOC/S were applied for paleosalinity reconstruction. The shales of the Mamfe basin show B/Ga is &lt;3, Sr/Ba &lt;0.2, and S/TOC is &lt;0.1 and TOC/S &gt;6 the values of the elemental ratio show that the Mamfe shales were deposited in a freshwater environment. For hydrothermal activities ratio, Sc/Cr was used and Binary diagrams TOC vs P and Co/Zn vs TOC were constructed to discriminate between normal water, mixed and hydrothermal influence. The Sc/Cr ratio was greater than 0.14 indicating that the shales in the Mamfe basin were deposited in a normal water environment with no influence from hydrothermal processes. The binary discriminant diagram of TOC vs P and Co/Zn vs TOC shows that all the shales were not influenced by any hydrothermal processes during the time of their deposition.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"7 3","pages":"Pages 237-246"},"PeriodicalIF":2.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000216/pdfft?md5=1028bd041ac7c7f8857c83f9ab982c96&pid=1-s2.0-S2451912X22000216-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42094295","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":"Fragments of archean cratonic lithosphere mantle at large","authors":"Weidong Sun,&nbsp;Fanfan Tian","doi":"10.1016/j.sesci.2022.06.001","DOIUrl":"10.1016/j.sesci.2022.06.001","url":null,"abstract":"","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"7 3","pages":"Pages 185-187"},"PeriodicalIF":2.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000198/pdfft?md5=f89fbf52f70fce2d309e9002a2b86e5a&pid=1-s2.0-S2451912X22000198-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41386090","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":"In situ determination of magnesite solubility and carbon speciation in water and NaCl solutions under subduction zone conditions","authors":"Wan-Cai Li ,&nbsp;Qinxia Wang","doi":"10.1016/j.sesci.2022.06.002","DOIUrl":"10.1016/j.sesci.2022.06.002","url":null,"abstract":"<div><p>The dissolution behavior of carbonates in subduction zone fluids has not been well constrained. In this study we investigated the solubility of magnesite in pure water and NaCl solutions (with up to 19 wt% NaCl) in situ with a hydrothermal diamond anvil cell, and determined carbon speciation in the fluid by Raman spectroscopy. The solubility of magnesite in pure water falls in the range of 0.01–0.05 mol/kg at 0.7–2.4 GPa and 635–940 °C, enhanced strongly by temperature. Least squares fitting of experimental data leads to the following empirical expression for magnesite solubility in pure water: <span><math><mrow><msub><mi>C</mi><msub><mtext>MgCO</mtext><mn>3</mn></msub></msub><mo>=</mo><mrow><mo>(</mo><mn>964510</mn><mo>±</mo><mn>41362</mn><mo>)</mo></mrow><mi>exp</mi><mrow><mo>(</mo><mfrac><mrow><mo>−</mo><mn>6953</mn><mo>±</mo><mn>690</mn></mrow><mi>T</mi></mfrac><mo>)</mo></mrow><mi>exp</mi><mrow><mo>[</mo><mrow><mfrac><mrow><mn>0.0200</mn><mo>±</mo><mn>0.0098</mn></mrow><mi>T</mi></mfrac><mrow><mo>(</mo><mi>P</mi><mo>−</mo><mn>1</mn><mo>)</mo></mrow></mrow><mo>]</mo></mrow></mrow></math></span> where <span><math><mrow><msub><mi>C</mi><msub><mtext>MgCO</mtext><mn>3</mn></msub></msub></mrow></math></span> is given in μg/g, <em>T</em> is the temperature in K, and <em>P</em> is the pressure in bar, respectively. The solubility of MgCO₃ is about an order of magnitude lower than that of CaCO₃ at 0.7–2.4 GPa, 640–940 °C. The solubility enhancement factor by NaCl (<em>m</em>/<em>m°</em> with <em>m</em> and <em>m°</em> being magnesite solubility in NaCl solution and water, respectively) presents as a parabolic trend with the mole fraction of NaCl in the range of 0–0.07, with a maximum amplification of 5.2 at <em>X</em>_NaCl = 0.035, which is different from the continuously increase of solubility with salinity increasing at high salinity conditions in previous studies and suggests the dissolution reaction of magnesite in dilute NaCl solution is different. Despite slight contamination of CH₄ formed by the reaction of the diamond anvils, we were able to identify CO₃²⁻ and HCO₃^- to be the aqueous carbon species, HCO₃^- was predominant over CO₃²⁻ in the range of 200–800 °C and 1.9–3.8 GPa and its proportion was affected by temperature, but not affected by pressure at 400–600 °C. Our experimental data suggest that in the absence of melting, only a small amount of magnesite can be mobilized by the slab-released fluid at subarc depths.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"7 3","pages":"Pages 200-214"},"PeriodicalIF":2.0,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000204/pdfft?md5=508fb508f728858e9c86795d6e307b50&pid=1-s2.0-S2451912X22000204-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43477579","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":"Early Permian magmatism above a slab window in Inner Mongolia, North China: Implications for the Paleo-Asian Ocean subduction processes and accretionary crustal growth","authors":"Jialiang Li ,&nbsp;Jingao Liu ,&nbsp;James M. Scott ,&nbsp;Chen Wu ,&nbsp;Di-Cheng Zhu ,&nbsp;Liangliang Zhang","doi":"10.1016/j.sesci.2022.02.001","DOIUrl":"10.1016/j.sesci.2022.02.001","url":null,"abstract":"<div><p>Identifying magmatic rock associations in a subduction zone is substantial for understanding the related geodynamic evolution. The final closure time of the Paleo-Asian Ocean and the exact subduction processes have continuously been controversial, hindering our recognition of the tectonic evolution of the Central Asian Orogenic Belt (CAOB). Here we investigated the Early Permian gabbros-granodiorites from Xi Ujimqin in the northern Inner Mongolian region. The gabbros have slightly depleted light rare-earth elements [(La/Yb)_N = 0.8] and flat heavy rare earth elements (HREE) [(Gd/Yb)_N = 1.1] that are comparable to those of N-MORB. They show depletion in Nb and Ta, positive whole-rock ε_Nd(t) values of +7.7 to +8.7 and zircon ε_Hf(t) values of +8.7 to +10.6. These mafic rocks are interpreted to be products of partial melting of depleted mantle that had been metasomatized by slab-derived fluids, with subsequent fractional crystallization and minor crustal contamination. These granodiorites chemically resemble typical adakites and have MORB-like whole-rock Sr<img>Nd isotopic compositions (⁸⁷Sr/⁸⁶Sr_i = 0.7028–0.7029; ε_Nd(t) = +8.2–+8.5) and positive zircon ε_Hf(t) (+13.4–+15.9) values, suggesting that they originated from the subducted slab-melts and reacted with mantle wedge peridotite. U<img>Pb zircon dating shows emplacement of N-MORB-type gabbros and adakitic granodiorites at ∼297 Ma and ∼290 Ma, respectively. Our new data indicate the presence coeval slab-derived adakites and slab fluid-metasomatized asthenosphere-derived N-MORB-type rocks, indicating that subduction lasted until at least the Early Permian. Such an association along with the extension-related magmatism in northern Mongolia recorded the northward ridge subduction of the Paleo-Asian Ocean during the Late Carboniferous–Early Permian. This model is consistent with the spatial distribution and the ages of magmatic activity with positive ε_Nd(t)–ε_Hf(t) values from this region. Ridge subduction and induced slab windows probably played a key role in Paleozoic crustal growth of CAOB, and by inference in the other accretionary orogens throughout Earth history.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"7 2","pages":"Pages 87-103"},"PeriodicalIF":2.0,"publicationDate":"2022-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000022/pdfft?md5=db794c7bfb50000efef0421dc5bbaf9b&pid=1-s2.0-S2451912X22000022-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44126216","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 Jurassic Gangmei Mo-W deposit in Guangdong Province and its implication for Mo-W mineralization in South China","authors":"Lipeng Zhang ,&nbsp;Yuxiao Chen ,&nbsp;Rongqing Zhang ,&nbsp;Kun Wang ,&nbsp;Yongjun Luo ,&nbsp;Congying Li ,&nbsp;Jinlong Liang","doi":"10.1016/j.sesci.2022.03.001","DOIUrl":"10.1016/j.sesci.2022.03.001","url":null,"abstract":"<div><p>South China developed large-scale Mesozoic magmatism and polymetallic mineralization, especially Jurassic W-Sn and Mo-W mineralization. Compared with W-Sn deposits, Mo-W deposits in South China have received less attention. The recently discovered Gangmei Mo-W deposit, which occurred in Guangdong Province, is the southernmost Jurassic Mo-W mineralization in South China. Here, we report the molybdenite Re-Os isotopic age of the Gangmei deposit and compile the Mo-W- and W-Sn-associated deposits in South China and their Re concentrations in molybdenites, aiming at constraining the ore-forming age of the Gangmei deposit, the scope of Mo-W mineralization in South China and the possible controlling factors of different mineralization types. Four molybdenite samples from the Gangmei deposit were chosen for Re-Os isotopic dating. The Re-Os model ages vary from 162.6 ± 1.6 Ma to 164.1 ± 1.6 Ma with a weighted mean age of 163.1 ± 1.4 Ma and yield an isochron age of 162.2 ± 4.1 Ma (MSWD = 1.01), consistent with the emplacement age of the Gangmei intrusion, indicating a genetic relationship between magmatic activity and mineralization. This age also agrees well with the large-scale Jurassic Mo-W- and W-Sn-associated mineralization in South China, suggesting that the scope of Jurassic Mo-W-associated mineralization can reach the southernmost part of South China. Rhenium concentrations in molybdenites from Jurassic Mo-W-associated and W-Sn-associated deposits in South China suggest that their magma sources are different, and Mo-W-associated deposits may involve more mantle-derived materials. In addition, oxygen fugacity may be another factor controlling different types of mineralization in South China.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"7 2","pages":"Pages 126-134"},"PeriodicalIF":2.0,"publicationDate":"2022-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2451912X22000101/pdfft?md5=57afab5cdd479626bbc1383a16cf6a99&pid=1-s2.0-S2451912X22000101-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44547888","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}