检索结果-南通市图书馆

Plate subduction, oxygen fugacity, and mineralization

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and limnology 2020年第1期38卷 64-74页

作者： liU He liAO Renqiang ZHANG lipeng li congying SUN Weidong Key Laboratory of Marine Geology and Environment Center of Deep-Sea ResearchInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Laboratory for Marine Biology and BiotechnologyPilot National Laboratory for Marine Science and TechnologyQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China

Plate subduction is the largest natural factory that processes elements,which controls recycling and mineralization of a variety of *** are three major ore deposit belts in the world:the circumPacific,the centralAsian,and the Tethys *** the three belts are closely associated with plate subductions,the mechanism remains *** approached this problem from systematic studies on the behaviours of elements during geologic *** contribution summaries the recent progress of our research *** results suggest that porphyry Cu deposits form through partial melting of subducted young oceanic crust under oxygen fugacities higher than AFMQ^+1.5,which is promoted after the elevation of atmospheric oxygen at ca.550 *** deposits are associated with reducing magmatic rocks formed as a consequence of slab *** Neo-Tethys tectonic regime hosts more than 60%of the world's total Sn *** is due to the reducing environment formed during the subduction of organic rich *** the same reason,porphyry Cu deposits formed in the late stages during the closure of the Neo-Tethys *** deposits are also controlled by slab rollback,but is not so sensitive to oxygen *** related W/Sn deposits are mostly accompanied by abundant accessory fluorites due to the breakdown of phengite and *** of phengite is also significant for hard rock lithium deposits,whereas orogenic belt resulted from plate subduction promote the formation of li brine *** red bed basins near the Nanling region are favorable for li *** Mo and Re are enriched in the oxidationreduction cycle during surface processes,and may get further enriched once Mo-,Re-enriched sediments are subducted and involved in *** plate subduction,Mo and Re fractionate from each *** is mainly hosted in porphyry Mo deposits and to a less extent,porphyry Cu-Mo deposits,whereas Re is predominantly hosted in

关键词： plate subduction oxygen fugacity ore deposits geochemical behaviors subduction factory

Plate convergence in the Indo-Pacific region

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and limnology 2020年第4期38卷 1008-1017页

作者： SUN Weidong ZHANG lipeng liAO Renqiang SUN Saijun li congying liU He Center of Deep Sea Research Institute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China University of Chinese Academy of Sciences Beijing 100049China

The Indo-Pacific convergence region is the best target to solve the teo remaining challenges of the plate tectonics theory,i.e.,subduction initiation and the driving force of plate *** studies proposed that the Izu-Bonin subduction initiation belongs to spontaneous initiation,which implies that it started from extension,followed by low angle *** geodynamic modeling suggests that the initiation of plate subduction likely occurred along a transform fault,which put the young spreading ridge in direct contact with old oceanic ***,however,does not explain the simultaneous subduction initiation in the west Pacific region in the ***,the subduction initiations in the Izu-BoninMariana,the Aleutian,and the Tonga-Kermadec trenches are associated with oceanic crusts of different ages,yet they occurred at roughly the same time,suggesting that they were all triggered by a maj or change in the Pacific ***,low angle subduction induces compression rather than extension,which requires external compression *** that the famous Hawaiian-Emperor bending occurred roughly at the same time with the onset of westward subductions in the west Pacific,we propose that these Cenozoic subductions were initiated by the steering of the Pacific plate,which are classified as induced *** subduction initiation usually occurs in young ocean basins,forming single-track *** closure s of Neo-Tethys Oceans were likely triggered by plume s in the south,forming northward ***,the Indian plate kept on moving northward more than 50 Ma after the collision between the Indian and Eurasian continents and the break-off of the subducted oceanic slab attached to *** strongly suggests that slab pull is not the main driving force of plate tectonics,whereas slab sliding is.

关键词： plate tectonics subduction initiation drifting history Pacific plate Indian plate slab sliding

Geochemical and Zircon Hf-O Isotopic Constraints on the Origin of Wulian A-Type Granite in Shandong Peninsula,Eastern China

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2022年第3期33卷 609-622页

作者： Shuai Yuan He li lipeng Zhang congying li Haiyang liu Ying-Yu Xue Weidong Sun Center of Deep Sea Research Institute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China School of Marine Sciences University of Chinese Academy of SciencesBeijing 100049China

Early Cretaceous A-type granitic plutons are widely distributed in Shandong Peninsula,which are of great significance to understanding the regional tectonic *** we report geochemical characteristics,geochronological results,and zircon Hf-O isotope compositions of Wulian granites to reveal its origin and geological *** granites share most characteristics of the A_(2)-type *** U-Pb LA-ICPMS analysis for Wulian A-type granites yields average age of 116.6±2.1 *** O isotope values range from 4.20‰to 5.57‰,and these values are marginally identical to or slightly lower than those of mantle zircon(5.3‰±0.3‰).Zirconε_(Hf)(t)values(-26.1--23.5)indicate an enriched *** zircon Hf-O isotope compositions indicate that the source region of Wulian granites involves the components of ancient oceanic *** from Wulian granites have the lower chlorine(0.06 wt.%-0.15 wt.%)and higher fluorine contents(2.11 wt.%-2.48 wt.%)compared with Haiyang pluton,together with their high(La/Gd)_(N),(La/Yd)_(N) and low(Gd/Yb)_(N) ratios and high oxygen state magma reflected from zircon,signifying that slab derived component was added into the overlying mantle region through fluid/*** geochemical characteristics of Wulian granites could be explained by the ridge(between the Izanagi and Pacific plates)subduction model,which began to influence the tectonic evolution of the Xuhuai region and Shandong Peninsula since~130±5 *** following slab window between two plates plausibly explains regional extension,resulting in hot magma upwelling and the formation of the A-type granite *** the Lower Yangtze River belt and Shandong Peninsula A-type granite proves the northward movement of the ridge between the Pacific Plate and Izanagi Plate.

关键词： A-type granite Shandong Peninsula ridge subduction zircon Hf-O isotope magma

同方期刊数据库

Provenance of colorless and brown volcanic glass in late Pleistocene tephra layers in the Western Philippine Sea

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and limnology 2024年第5期42卷 1438-1449页

作者： Fuqing JIANG Zhishun ZHANG Zhaohui ZHANG Guoliang ZHANG Peng HUANG Xiaojing ZHOU Zhifang XIONG congying li Tiegang li Key Laboratory of Ocean Observation and Forecasting and Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Geology Qingdao Marine Science and Technology CenterQingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Institute of Marine Chemistry and Environment Ocean CollegeZhejiang UniversityZhoushan 316021China College of Marine Technology and Environment Dalian Ocean UniversityDalian 116023China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China

Tephra layers in the western Philippine Sea,characterized by abundant volcanic glass shards,may provide crucial evidence on the eruption history of volcanoes and tectonic evolution of the western Pacific.A 220-ka sediment core from the Benham Rise in the western Philippine Sea offers new insights into the provenance of four intercalated tephra layers(T1–T4,in chronological order)containing either colorless or brown glass *** to primitive mantle,all glass shards are enriched in large-ion lithophile elements,such as Rb,Cs,and Pb,and depleted in high field-strength elements,such as Th,Nb,and Ta,indicating a subduction-related *** colorless glass shards are characterized by high SiO_(2)(>78%)and light rare earth element(LREE)contents as well as high La/Sm ratios(>9),low FeO and MgO contents(100),pointing to a rhyolitic composition and a medium-K calc-alkaline serial *** contrast,the brown glass shards are characterized by lower SiO_(2)(line andesite *** glass shards from layers T3(152 ka)and T4(172 ka)were correlated with volcanic deposits from the Taal and Laguna Caldera in the Maccolod Corridor,respectively,while the colorless glass shards from layers T1(36.5 ka)and T2(61.2 ka)were likely sourced from the Irosin Caldera in the Bicol *** the provenance of late Pleistocene tephra layers in the western Philippine Sea is helpful to complement a Philippine volcanic history and establish a regional tephrochronostratigraphy.

关键词： volcanic glass provenance chemical composition Philippine Sea late Pleistocene

Intermittent Availability and its Computation Model for Multiple Identical Units System

在线全文

学校读者我要写书评

暂无评论

Intermittent Availability and its Computation Model for Mult...

An emerging plume head interacting with the Hawaiian plume tail

第25届中国控制与决策会议

作者： ling Wang Jinjin Wu Xiai Chen congying li Wenbo Na College of Mechanical and Electrical Engineering China Jiliang University Department of Safety Defense Zhejiang Police Vocational Academy Zhejiang Public Information Industry Co. Ltd Department of Information Communication

ISBN: (纸本)9781467355339

This paper proposes the concept of intermittent availability for Multiple Identical Units Systems （MIUS） after analyzing the disadvantages of the existing availability theories. The analytical definition of intermittent availability is described, and the connotation and application conditions of intermittent availability are also discussed in detail. In the case study, the expected values of intermittent availability for a MIUS are predicted by Monte Carlo simulation. The proposed intermittent availability theory is applicable to MIUS working intermittently with periodic maintenance time windows.

关键词： Multiple Identical Units System, Intermittent Availability, Application Conditions, Calculation Model Monte Carlo Simulation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The Innovation 2023年第2期4卷 41-46,40页

作者： lipeng Zhang Zebin Cao Robert E.Zartman congying li Saijun Sun lijun liu Weidong Sun Center of Deep Sea Research Institute of OceanologyChinese Academy of SciencesQingdao 266071China Deep-Sea Multidisciplinary Research Center Laoshan LaboratoryQingdao 266237China Department of Geology University of Illinois at Urbana-ChampaignUrbanaIL 61820USA Laboratory for Marine Geology Laoshan LaboratoryQingdao 266237China University of the Chinese Academy of Sciences Beijing 100049China

The Hawaiian-Emperor seamount chain has shown two subparallel geographical and geochemical volcanic trends,Loa and Kea,since-5 Ma,for which numerous models have been proposed that usually involve a single mantle plume sampling different compositional sources of the deep or shallow ***,both the dramatically increased eruption rate of the Hawaiian hotspot since-5 Ma and the nearly simultaneous southward bending of the Hawaiian chain remain unexplained.

关键词： volcanic shallow mantle

Effects of layer thickness on desiccation cracking behaviour of a vegetated soil

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biogeotechnics

Biogeotechnics 2024年第2期2卷 47-53页

作者： congying li Qing Cheng Chaosheng Tang Yingdong Gu lingxin Cui Haowen Guo School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China Department of Civil and Environmental Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong

The objective of this study is to explore how different layer thicknesses affect the desiccation cracking behaviour of vegetated *** the experiment,an electronic balance was employed to quantify water evaporation,while a digital camera was utilized to capture the initiation and progression of soil surface *** indicate that in the early drying process,the rate of evapotranspiration in vegetated soil correlates positively with leaf *** soil samples with the same layer thickness,the constant rate stage duration is consistently shorter in vegetated soil samples than in their bare soil *** the layer thickness increases,both vegetated and bare soil samples crack at higher water ***,vegetated soil samples crack at lower water content than their bare soil *** significantly reduces the soil surface crack ratio and improves the soil crack *** crack reduction ratio is positively correlated with both root weight and length *** thicker vegetated soil layers,the final surface crack length noticeably declines.

关键词： Desiccation crack Vegetated soil Layer thickness Root density

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

斑岩型钼矿床的形成机制与地球化学过程

岩石学报 2020年第1期36卷 77-84页

作者：李聪颖廖仁强中国科学院海洋研究所深海研究中心青岛266071 青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室青岛266237 中国科学院海洋大科学研究中心青岛266071 中国科学院大学北京100049

斑岩型钼矿床是世界钼矿床中最重要的种类,其中90%以上的钼矿床都和斑岩有关。斑岩型钼矿床主要分布于环太平洋成矿带和特提斯成矿带上,主要与板块俯冲过程有关,可以分为斑岩铜钼矿床、高氟型斑岩钼矿床和低氟型斑岩钼矿床。我们通过对... 详细信息

斑岩型钼矿床是世界钼矿床中最重要的种类,其中90%以上的钼矿床都和斑岩有关。斑岩型钼矿床主要分布于环太平洋成矿带和特提斯成矿带上,主要与板块俯冲过程有关,可以分为斑岩铜钼矿床、高氟型斑岩钼矿床和低氟型斑岩钼矿床。我们通过对全球斑岩型钼矿床的时空分布与钼元素地球化学性质分析,认为斑岩型钼矿床的物质来源是钼元素通过表生地球化学作用进行初始富集后形成的富钼沉积物。新元古代晚期(750~542Ma)大气氧再次升高之后,富钼的黑色页岩等才大量出现,因此斑岩型钼矿床主要形成于500Ma之后。富钼黑色页岩等沉积物在板块俯冲过程中脱水,形成富含Mo和Re的变质流体,同时两者发生分异。这种变质流体交代上覆地幔楔使Mo和Re留存在其中。随着俯冲洋壳的部分熔融,形成富Cu(Au)的岩浆,穿过富含Re(Mo)的上覆地幔楔,形成斑岩型铜钼矿床,因此这类矿床的辉钼矿Re含量更高。而随后出现的板块后撤,使软流圈上涌,板片上大量多硅白云母分解,形成了富含F的岩浆,穿过富含Mo的上覆地幔楔,进而形成高氟型斑岩矿床。低氟型钼矿床很可能与俯冲关系较小,富钼沉积物通过造山过程被深埋,在适当的条件下形成低氟型斑岩钼矿床。

关键词：斑岩钼矿床物质来源俯冲作用黑色沉积物

A comparison of Logit and Probit models using Monte Carlo simulation

在线全文

学校读者我要写书评

暂无评论

A comparison of Logit and Probit models using Monte Carlo si...