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| 1 | SHRIMP U-Pb Zircon Geochronology of the Xiaotongguanshan and Shatanjiao Intrusions and Its Petrological Implications in the Tongling Area, Anhui显示文摘This paper determines the crystallization ages of the Xiaotongguanshan quartz monzodiorite and Shatanjiao quartz monzonite porphyry from the Tongling area using the SHRIMP zircon U-Pb method. The crystallization age of the former is 142.8±1.8 Ma; that of the latter is 151.8±2.6 Ma. These data indicate that they were formed during the Late Jurassic (142.8 to 151.8 Ma). Zoned magma chamber was formed because of double diffusive convection. Therefore, the intrusive sequence of magma is generally from quartz monzonite through quartz monzodiorite to pyroxene monzodiorite, i.e. an inverted sequence. | DI Yongjun WU Ganguo ZHANG Da SONG Biao ZANG Wenshuan ZHANG Zhongyi LI Jinwen | 2005 | Acta Geologica Sinica(English Edition)2005，79，6： | 22 |
| 2 | The Early Jurassic magmatism in northern Guangdong Province, southeastern China: Constraints from SHRIMP zircon U-Pb dating of Xialan complex显示文摘This paper reports SHRIMP zircon U-Pb ages of 196±2 Ma for granite, and 195±1 Ma for gabbro from the Xialan complex in the Meizhou area, northern Guangdong Province. These results shed new light on the calm stage of magmatic activity in southeastern China during 200-180 Ma, and revealed that the back-arc extension induced by the subduction of the western Pacific plate may have begun at 195 Ma at least. Field observation on the fresh outcrops allows us to recognize some features formed by magma mixing. A part of the gabbro has a fine-grained rim of 20-30 cm at the margin, and thins gradually to-ward the granite; numerous dark fine-grained to microcrystalline dioritic enclaves developed in the granite. These enclaves vary in shape and size, dark minerals concentrated at the margin of enclaves, and the contact between enclaves and host rock is either obvious or obscure, or gradational. In addi-tion, needle-shaped apatites are included in the enclaves. The REE patterns of gabbros, as well as the trace element patterns, are generally consistent with those of granitic rocks. The above characters further suggest that in the Early Jurassic the injection of basic magma had melted deep continental crust and produced acidic magma, and the Xialan complex was produced by the mixing of them. | YU XinQi DI YongJun WU GanGuo ZHANG Da ZHENG Yong DAI YanPei | 2009 | Science China Earth Sciences2009，52，4： | 12 |
| 3 | SHRIMP zircon U-Pb dating of the intrusives in the Tongling metallogenic cluster and its dynamic setting显示文摘This paper selected five typical Mesozoic intrusives from the Tongling metallogenic cluster (Xiaotongguanshan, Fenghuangshan, Xinqiao, Dongguashan, and Shatanjiao plutons), and made a systemic SHRIMP zircon U-Pb dating for the five plutons, which produced an age range of 151.8±2.6- 142.8±1.8 Ma. This work put an accurate constraint on the formation age of the intrusives in the Tongling metallogenic cluster. These age data indicate that magmatic activity reached a peak during Late Jurassic. The intrusive sequence of magma is generally from quartz monzonite (porphyry) through monzonite to granodiorite to quartz monzodiorite to pyroxene monzodiorite to gabbro-diabase. The intrusives of different lithology differed in crystallization age, probably implying the intrusives in the Tongling area underwent an evolutional process of magma, which was closely related to geodynamical setting in the depths of the area. A dynamic model was presented for the origin of the igneous rocks in the study area as follows. The assembly between the Yangtze craton and the North China craton fini- shed at the end of T3, and then the stage of another compressional orogeny began in the Tongling area, i.e., Pacific dynamic system. Along with the subduction of the Izanagi plate underneath the Eurasian plate at J2-J3, NW-trending compression toward the East China continent was produced, and compres- sional deformation also took place, forming NE-trending fold and resulting in thickening of the crust in the Tongling area. High-density eclogite-facies rocks were produced in the low part of the crust, re- sulting in the delamination of mantle lithosphere and lower crust, and upwelling of materials in as- thenosphere. Decompression melting produced basaltic magma, and the materials in lower crust were heated by the underplating of the basaltic magma. Thus, melting of lower crust yielded granitic magma, which intruded along deep and large faults through various geological processes (J3-K1). The SHRIMP U-Pb zircon age of 151.8±2.6-142.8±1.8 Ma for intrusives in the Tongling area suggests that the de- lamination of lithosphere mantle and lower crust at least began at middle-late stage of Late Jurassic, resulting in sharp thinning of lithosphere and intense extension of middle-upper crust. Thus, a lot of decollements were produced between cover and cover, basement and cover, and middle and lower crust. This was structural layering or detachment of lithosphere in the Tongling area. Three concordant ages for old inherited cores of magmatic origin (747-823 Ma) indicated that there were obvious mag- matism in the Tongling area during Neoproterozoic, and a little more of the Neoproterozoic igneous source rocks participated in the formation of Mesozoic intrusives. | GanGuo Wu Da Zhang YongJun Di WenShuan Zang XiangXin Zhang Biao Song ZhongYi Zhang | 2008 | Science China Earth Sciences2008，51，7： | 11 |
| 4 | Regulation of transcriptionally active genes via the catalytically inactive Cas9 in C. elegans and D. rerio显示文摘 | Lijiang Long Hong Guo Di Yao Kai Xiong Yongjun Li Pengpeng Liu Zuoyan Zhu Dong Liu | 2015 | Cell Research2015，25，5： | 7 |
| 5 | Cobalt phthalocyanine-graphene complex for electro-catalytic oxidation of dopamine显示文摘Cobalt phthalocyanine-graphene(CoPc-Gr) complex are fabricated through π-π interaction of each components,with CoPc adsorbed/inserted on/in the graphene sheets.The obtained complex could be used in the electro-chemical detection of various medicines.CoPc-Gr modified glassy electrode shows excellent response to the electro-oxidation of dopamine(DA) and ascorbic acid(AA),much better than those of CoPc,graphene oxide(GrO) or graphene(Gr) modified electrode.Significantly,the detection of dopamine is a diffusion-controlled process,highly selective,and has a low detection limit and broad linear range. | Jinghe Yang Di Mu Yongjun Gao Juan Tan Anhui Lu Ding Ma | 2012 | Journal of Natural Gas Chemistry2012，21，3： | 6 |
| 6 | Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykes显示文摘The tectonic evolution of SE China block since late Paleozoic remains debated.Here we present a new set of zircon U-Pb geochronological,Lu-Hf isotopic data and whole-rock geochemistry for two stages of basicintermediate dykes from the southwestern Fujian.The samples were collected from the NE-trending(mainly diabases) and NW-trending(mainly diabasic diorites) dykes and yielded zircon U-Pb ages of 315 and 141 Ma,with ε_(Hf)(t) values of-8.90 to 7.49 and-23.39 to-7.15(corresponding to T_(DM2) values of 850 to 1890 Ma and 737 to 2670 Ma),respectively.Geochemically these rocks are characterized by low TiO_2(0.91-1.73 wt.%)and MgO(3.04-7.96 wt.%),and high Al_2O_3(12.5-16.60 wt.%) and K_2O(0.60-3.63 wt.%).Further they are enriched in LREEs and ULEs(Rb,Ba,Th and K).but depleted in HFSEs(Nb,Ta and Zr).The tectonic discrimination analysis revealed that the dykes were formed in an intraplate extensional environment.However,the NW trending dykes show crust-mantle mixed composition,which indicate an extensional tectonic setting with evidence for crustal contamination.The SE China block experienced two main stages of extensional tectonics from late Carboniferous to early Cretaceous.The tectonic evolution of the SE China block from late Devonian to Cretaceous is also evaluated. | Sen Wang Da Zhang Ganguo Wu Absai Vatuva Yongjun Di Pengcheng Yan Haibin Feng Shuai Ma | 2017 | Geoscience Frontiers2017，8，3： | 6 |
| 7 | Early–Middle Triassic Intrusions in Western Inner Mongolia, China: Implications for the Final Orogenic Evolution in Southwestern Xing-Meng Orogenic Belt显示文摘The end-Permian to Early–Middle Triassic magmatic rocks in Inner Mongolia can provide valuable insights into the relationships between the collisional processes and the magmatic responses during the final orogenic evolution of Xing-Meng orogenic belt(XMOB). This paper presents zircon U-Pb ages and Hf isotopes, whole rock geochemical and Sr-Nd-Pb isotopic data for the Early–Middle Triassic diabases and monzogranites from the Langshan area, southwestern XMOB. Our results suggest that the studied diabases and monzogranites were respectively formed during Early Triassic and Middle Triassic. The Early Triassic diabases are characterized by 'arc-like' geochemical signatures, including enrichment in Rb, U and K, and depletion in Nb, Ta, P and Ti. They have negative to weak positive εNd(t) values(-3.1 to +1.5) and relatively high initial ratios of 208 Pb/204 Pb(35.968–37.346), 207 Pb/204 Pb(15.448–15.508) and 206 Pb/204 Pb(16.280–17.492), indicating a subduction-metasomatized enriched lithospheric mantle source. Their low Ba/Rb(2.72–6.56), Ce/Y(0.97–1.39) and(Tb/Yb)N ratios(1.31–1.45) suggest that the parental magma was likely originated from low degree partial melting of the phlogopite-bearing lherzolite in a spinel-stability field. The Middle Triassic monzogranites show high Sr/Y ratios, low Mg O, Cr and Ni contents, high Zr/Sm ratios(40–64), negative zircon εHf(t) values(-25.8 to-8.8), as well as relatively flat heavy rare earth element patterns. They were likely derived from low degree partial melting of a moderately thickened ancient lower crust. The diabases and the slightly postdated high Sr/Y granites in this study represent the magmatic responses to the final orogenic evolution in the southwestern XMOB. Together with regional works, we propose that the slab break-off of the Paleo-Asian oceanic lithosphere following the terminal collision between the North China Craton and the South Mongolia terranes triggered asthenospheric upwelling, and the ongoing convergence further initiated moderately crustal thickening and uplift in the XMOB. | Min Liu Shaocong Lai Da Zhang Renzhi Zhu Jiangfeng Qin Yongjun Di | 2019 | Journal of Earth Science2019，30，5： | 4 |
| 8 | Cenozoic Volcanism in South China Sea and Its Vicinity and South China Sea Spreading显示文摘The rock series, rock types and Sr Nd isotopic dating of the Cenozoic volcanic rocks in the South China Sea are similar to those in its vicinity. On the basis of the spreading age of the South China Sea, the Cenozoic volcanic rocks are divided into three stages: the pre spreading stage, the spreading stage and the post spreading stage. The deep process characteristics of the asthenosphere and lithosphere may be inferred from the study on primary basaltic magma. The top layers of the asthenosphere both in the spreading stage and in the pre spreading stage are closer to the earth surface than that in the post spreading stage. From the pre spreading stage to the spreading stage, the top layer of the asthenosphere decreased in depth, while the amount of interstitial partial melts increased. The evolution of the primary basaltic magma shows a progressive evolution sequence of the rifting volcanism and a faster lithospheric spreading velocity. From the spreading stage to the post spreading stage, the top layer of the asthenosphere gradually increased in depth, but the amount of interstitial partial melts decreased. The evolution of primary basaltic magma shows a retrogressive evolution sequence of the rifting volcanism and a gradual decrease in the lithospheric spreading velocity. The depth recognized by the study on the Cenozoic volcanism demonstrates the deep environment for the formation and evolution of the South China Sea. | Zhao Hailing Deng Jinfu Li Kaiming Di Yongjun Yu Junji Zhao Jianhua Li Yonghua Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083 | 2002 | Journal of China University of Geosciences2002，13，3： | 4 |
| 9 | Progress in researching into the transition of the Mesozoic tectonic systems in southeast China显示文摘这篇论文论述在东南中国用进 NE- NNE 西方的和平的领域构造的 E-W paleo-Tethyan 在中生代构造系统转变的研究上做的最近的进步。西方太平洋领域的 Tectonism 在中间的侏罗记开始了(J 2) 并且形成了一套趋势 NE 结构, non-coaxially 早并且同时代地在可以是的电子 trending 构造的带上套印由 paleo- Tethyan 领域生产了。因此从电子 trending paleo- Tethyan 开始了构造领域转变到在早白垩纪和平、充分完成的趋势 NE。东方 Nanling 区域是在中间的侏罗记的转变的一个连接地区(J 2), 并且此后,连接地区可能倾斜地移居到沿海的区域,在此是这个学习区域的东方部分。到 Nanling 区域的北方, Ganjiang 差错地区是在二个构造领域之间的边界。相应于构造系统的转变,中国从一个有压缩性的系统改变了到前的 SE 的地球动力学紧张的系统,继续直到中生代的结束,第三级。 | YU Xinqi WU Ganguo ZHANG Da ZHANG Xiangxin DI yongjun ZANG Wenshuan WANG Qunfeng HUANG Huojian | 2006 | Progress in Natural Science:Materials International2006，16，6： | 3 |
| 10 | Neoproterozoic Tectonic Setting of Southeast China:New Constraints from SHRIMP U-Pb Zircon Ages and Petrographic Studies on the Mamianshan Group显示文摘华南的浙江,福建,和江西省的前寒武纪的构造历史为理解华南的构造进化是重要的但是它的 magmatic 活动, petrogenesis, Mamianshan 组的 stratigraphic 顺序仍然是强烈争论的。这里我们现在的新敏感高分辨率离子微探查(虾) 为 Mamianshan 组的 U-Pb 锆石 geochronological 数据和 petrographical 数据到抑制这些区域的构造框架。我们的结果证明 Dongyan 形成的绿片岩的 SHRIMP U-Pb 锆石年龄是 796.544.3 妈, Daling 形成是 756.2 污琠慲散獲猠杵敧瑳琠慨 ? 桴 ? 湩整敲瑳摥椠瑮畲楳湯 ? 牡 ? 摡歡瑩捩爠 ' | WU Ganguo YU Xinqi DI Yongjun ZHANG Da | 2010 | Acta Geologica Sinica(English Edition)2010，84，2： | 3 |
| 11 | Inhibition of Axinl in osteoblast precursor cells leads to defects in postnatal bone growth through suppressing osteoclast formation显示文摘Axinl is a negative regulator of β-catenin signaling and its role in osteoblast precursor cells remains undefined.In the present studies,we determined changes in postnatal bone growth by deletion of Axinl in osteoblast precursor cells and analyzed bone growth in newborn and postnatal Axin1 O5X mice and found that hypertrophic cartilage area was largely expanded in AxinlOSX KO mice.A larger number of chondrocytes and unabsorbed cartilage matrix were found in the bone marrow cavity of Axin1OSX KO mice.Osteoclast formation in metaphyseal and subchondral bone areas was significantly decreased,demonstrated by decreased TRAPpositive cell numbers,associated with reduction of MMP9-and cathepsin K-positive cell numbers in Axin1 O5X KO mice.OPG expression and the ratio of O p g to Rankl were significantly increased in osteoblasts of Axinl O5X KO mice.Osteoclast formation in primary bone marrow derived microphage(BMM)cells was significantly decreased when BMM cells were cultured with conditioned media(CM)collected from osteoblasts derived from Axin1OSX mice compared with BMM cells cultured with CM derived from WT mice.Thus,the loss of Axinl in osteoblast precursor cells caused increased OPG and the decrease in osteoclast formation,leading to delayed bone growth in postnatal Axin1°sx KO mice. | Bing Shu Yongjian Zhao Shitian Zhao Haobo Pan Rong Xie Dan Yi Ke Lu Junjie Yang Chunchun Xue Jian Huang Jing Wang Dongfeng Zhao Guozhi Xiao Yongjun Wang Di Chen | 2020 | Bone Research2020，8，3： | 3 |
| 12 | Evolution of the magmatic–hydrothermal system and formation of the giant Zhuxi W–Cu deposit in South China显示文摘The Zhuxi deposit is a recently discovered W–Cu deposit located in the Jiangnan porphyry–skarn W belt in South China. The deposit has a resource of 3.44 million tonnes of WO3, making it the largest on Earth,however its origin and the evolution of its magmatic–hydrothermal system remain unclear, largely because alteration–mineralization types in this giant deposit have been less well-studied, apart from a study of the calcic skarn orebodies. The different types of mineralization can be classified into magnesian skarn, calcic skarn, and scheelite–quartz–muscovite(SQM) vein types. Field investigations and mineralogical analyses show that the magnesian skarn hosted by dolomitic limestone is characterized by garnet of the grossular–pyralspite(pyrope, almandine, and spessartine) series, diopside, serpentine,and Mg-rich chlorite. The calcic skarn hosted by limestone is characterized by garnet of the grossular–andradite series, hedenbergite, wollastonite, epidote, and Fe-rich chlorite. The SQM veins host highgrade W–Cu mineralization and have overprinted the magnesian and calcic skarn orebodies. Scheelite is intergrown with hydrous silicates in the retrograde skarn, or occurs with quartz, chalcopyrite, sulfide minerals, fluorite, and muscovite in the SQM veins.Fluid inclusion investigations of the gangue and ore minerals revealed the evolution of the ore-forming fluids, which involved:(1) melt and coexisting high–moderate-salinity, high-temperature, high-pressure(>450 ℃and >1.68 kbar), methane-bearing aqueous fluids that were trapped in prograde skarn minerals;(2) moderate–low-salinity, moderate-temperature, moderate-pressure(~210–300 ℃and ~0.64 kbar),methane-rich aqueous fluids that formed the retrograde skarn-type W orebodies;(3) low-salinity,moderate–low-temperature, moderate-pressure(~150–240 ℃and ~0.56 kbar), methane-rich aqueous fluids that formed the quartz–sulfide Cu(–W) orebodies in skarn;(4) moderate–low-salinity,moderate-temperature, low-pressure(~150–250 ℃and ~0.34 kbar) alkanes-dominated aqueous fluids in the SQM vein stage, which led to the formation of high-grade W–Cu orebodies. The S–Pb isotopic compositions of the sulfides suggest that the ore-forming materials were mainly derived from magma generated by crustal anatexis, with minor addition of a mantle component. The H–O isotopic compositions of quartz and scheelite indicate that the ore-forming fluids originated mainly from magmatic water with later addition of meteoric water. The C–O isotopic compositions of calcite indicate that the ore-forming fluid was originally derived from granitic magma, and then mixed with reduced fluid exsolved from local carbonate strata. Depressurization and resultant fluid boiling were key to precipitation of W in the retrograde skarn stage. Mixing of residual fluid with meteoric water led to a decrease in fluid salinity and Cu(–W) mineralization in the quartz–sulfide stage in skarn. The high-grade W–Cu mineralization in the SQM veins formed by multiple mechanisms, including fracturing, and fluid immiscibility, boiling, and mixing. | Xiaolong He Da Zhang Yongjun Di Ganguo Wu Bojie Hu Hailong Huo Ning Li Fang Li | 2022 | Geoscience Frontiers2022，13，1： | 2 |
| 13 | Antithrombotie management of ischaemic stroke and transient ischaemic attack in China:a consecutive cross-sectional survey 显示文摘 | Yilong Wang Di Wu Yongjun Wang | 2010 | Clinical and Experimental Pharmacology and Physiology2010，37，： | 1 |
| 14 | New geochronological data from the Paleozoic and Mesozoic nappe structures, igneous rocks, and molybdenite in the North Wuyi area, Southeast China显示文摘 | Xinqi Yu Ganguo Wu Xixi Zhao Da Zhang Yongjun Di Junting Qiu Yanpei Dai Chunlin Li | 2011 | Gondwana Research2011，，2： | 1 |
| 15 | Activation and Coreceptor Expression of T Lymphocytes in HIV/AIDS Patients of China显示文摘 | Hong Shang Zining Zhang Yongjun Jiang Xiaoxu Han Yanan Wang Min Zhang Xiaohui Ye Ying Liu Yingying Diao Di Dai Wenqing Geng | 2005 | Journal of Clinical Immunology2005，，1： | 1 |
| 16 | Dogs lacking Apolipoprotein E show advanced atherosclerosis leading to apparent clinical complications显示文摘Atherosclerotic cardiovascular disease resulting from dysregulated lipid metabolism is the leading cause of morbidity and mortality worldwide.Apolipoprotein E(ApoE)plays a critical role in cholesterol metabolism.Knockouts in lipid-metabolizing proteins including ApoE in multiple model organisms such as mice and rats exhibiting elevated levels of cholesterol have been widely used for dissecting the pathology of atherosclerosis,but few of these animal models exhibit advanced atherosclerotic plaques leading to ischemia-induced clinical symptoms,limiting their use for translational studies.Here we report hypercholesterolemia and severe atherosclerosis characterized by stenosis and occlusion of arteries,together with clinical manifestations of stroke and gangrene,in ApoE knockout dogs generated by CRISPR/Cas9 and cloned by somatic cell nuclear transfer technologies.Importantly,the hypercholesterolemia and atherosclerotic complications in F0 mutants are recapitulated in their offspring.As the ApoE-associated atherosclerosis and clinical manifestations in mutant dogs are more similar to that in human patients compared with those in other animal models,these mutant dogs will be invaluable in developing and evaluating new therapies,including endovascular procedures,against atherosclerosis and related disorders. | Hui Zhao Jianping Zhao Di Wu Zhaolin Sun Yang Hua Min Zheng Yumei Liu Qi Yang Xiahe Huang Yuan Li Yueshan Piao Yingchun Wang Sin Man Lam Huijuan Xu Guanghou Shui Yongjun Wang Haifeng Yao Liangxue Lai Zhuo Du Jidong Mi Enqi Liu Xunming Ji Yong Q.Zhang | 2022 | Science China(Life Sciences)2022，65，7： | 0 |
| 17 | Deep Transcranial Magnetic Stimulation as a Potential Approach for Digital Pain Management in Patients with Psychotic Disorder显示文摘Dear Editor,Pain is a common and complex clinical problem which affects 28%-50%of the general population and is responsible for large health-related costs.People with chronic pain often develop nociceptive sensitization,having mood and anxiety disorders as comorbidities.Sustained pain may alter the processing of affective information in the brain,thereby inducing anxio-depressive disorders. | Peijun Ju Di Zhao Cuizhen Zhu Yongjun Zheng Shiyu Peng Haisu Wu Beibei Yang Zhenghui Yi Tifei Yuan Jinghong Chen | 2023 | Neuroscience Bulletin2023，39，1： | 0 |
| 18 | A Sea Ice Recognition Algorithm in Bohai Based on Random Forest显示文摘As an important maritime hub,Bohai Sea Bay provides great convenience for shipping and suffers from sea ice disasters of different severity every winter,which greatly affects the socio-economic and development of the region.Therefore,this paper uses FY-4A(a weather satellite)data to study sea ice in the Bohai Sea.After processing the data for land removal and cloud detection,it combines multi-channel threshold method and adaptive threshold algorithm to realize the recognition of Bohai Sea ice under clear sky conditions.The random forests classification algorithm is introduced in sea ice identification,which can achieve a certain effect of sea ice classification recognition under cloud cover.Under non-clear sky conditions,the results of Bohai Sea ice identification based on random forests have been improved,and the algorithm can effectively identify Bohai Sea Ice and can improve the accuracy of sea ice identification,which lays a foundation for the accuracy and stability of sea ice identification.It realizes sea ice identification in the Bohai Sea and provides data support and algorithm support for marine climate forecasting related departments. | Tao Li Di Wu Rui Han Jinyue Xia Yongjun Ren | 2022 | Computers, Materials & Continua2022，，11： | 0 |
| 19 | Genesis of Makeng-type Fe-polymetallic deposits in SE China:New constraints by geochronological and isotopic data from the Dapai–Makeng metallogenic system显示文摘The southwestern Fujian depression belt(SFDB)is an economically important Mesozoic Fe metallogenic belt in South China and is renowned for its Makeng-type Fe deposits,in which stratified skarn Fe orebodies generally occur in or near the contact zone between late Paleozoic carbonate sequences and Mesozoic granites.However,the genesis and geodynamic setting of these deposits remain unclear because the characteristics of the widely distributed Pb–Zn–Cu and Mo orebodies in these deposits and the temporal,spatial,and genetic relationships between magmatism and mineralization are poorly defined.The Dapai Fe polymetallic deposit in the SFDB is a typical example of Makeng-type Fe deposits but also has regional significance,whereby the stratified skarn Fe orebodies have overprinted the stratabound Pb–Zn–Cu mineralization followed by final fissure-filling by vein-disseminated Mo mineralization.A detailed geological investigation suggests that episodic magmatic–hydrothermal events were involved in the formation process of the Dapai Fe polymetallic deposit.Pyrite and sphalerite from the Pb–Zn–Cu orebodies yield an Rb–Sr isochron age of 175.5±3.3 Ma,which is regarded as the timing of Pb–Zn–Cu mineralization.Zircon grains from Fe-mineralized granodiorite porphyry and Mo-mineralized monzogranite yield weighted-mean 206Pb/238U ages of 146.3±0.9 Ma and 131.7±0.4 Ma,interpreted as the timings of Fe and Mo mineralization,respectively.Six zircons from granodiorite also yield a 206Pb/238U model age cluster of184 Ma,which coincides reasonably with the timing of Pb–Zn–Cu mineralization and implies the existence of an unidentified ore-related intrusion in the Dapai deposit.Five further zircons from the porphyritic granodiorite yield an age cluster of-150 Ma,consistent with the timing of Fe mineralization.Galena,pyrite,and sphalerite from the Dapai and Makeng deposits have similar S–Pb isotopic compositions and suggest a magmatic source.Combining our results with published isotopic data for the SFDB,we suggest that the Pb–Zn–Cu mineralization in this area was derived from crustal magmas that mixed with mantle-derived magma prior to emplacement.The d56Fe and d57Fe values of magnetite from Dapai and Makeng are both slightly lower than those of the orerelated granites,suggesting that Fe in the initial fluid in both deposits was derived mainly from coeval granitic rocks.The Fe isotopic variation between intrusions and skarn Fe orebodies is interpreted as resulting from mass fractionation that occurred during fluid exsolution from melt.Contents of Re in molybdenite from published data for the SFDB indicate crust–mantle mixed sources of Mo and Re.The Makeng-type Fe polymetallic deposits formed as a result of three magmatic–hydrothermal episodes,generating Pb–Zn–Cu mineralization at 185–160 Ma,Fe–Mo mineralization at 150–140 Ma,and Mo–Fe mineralization at 135–130 Ma.The different metal associations formed during multiple stages of magmatism caused by ongoing subduction and rollback and/or retreat of the paleo-Pacific Plate. | Absai Vatuva Xiaolong He Xinming Zhang Da Zhang Haibin Feng Yuan Yuan Sen Wang Jinjun Yi Yongjun Di | 2023 | Geoscience Frontiers2023，14，5： | 0 |
| 20 | High capacity reversible data hiding in encrypted images based on adaptive quadtree partitioning and MSB prediction显示文摘To improve the embedding capacity of reversible data hiding in encrypted images(RDH-EI),a new RDH-EI scheme is proposed based on adaptive quadtree partitioning and most significant bit(MSB)prediction.First,according to the smoothness of the image,the image is partitioned into blocks based on adaptive quadtree partitioning,and then blocks of different sizes are encrypted and scrambled at the block level to resist the analysis of the encrypted images.In the data embedding stage,the adaptive MSB prediction method proposed by Wang and He(2022)is improved by taking the upper-left pixel in the block as the target pixel,to predict other pixels to free up more embedding space.To the best of our knowledge,quadtree partitioning is first applied to RDH-EI.Simulation results show that the proposed method is reversible and separable,and that its average embedding capacity is improved.For gray images with a size of 512×512,the average embedding capacity is increased by 25565 bits.For all smooth images with improved embedding capacity,the average embedding capacity is increased by about 35530 bits. | Kaili QI Minqing ZHANG Fuqiang DI Yongjun KONG | 2023 | Frontiers of Information Technology & Electronic Engineering2023，24，8： | 0 |
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