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Cesium-rubidium mineralization in Himalayan leucogranites

Science China Earth Sciences 2023年第12期66卷 2827-2852页

作者： Fangyang HU xiaochi liu Shaoxiong HE Jiamin WANG Fuyuan WU Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 00029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

This paper presents a study of a newly discovered pollucite-lepidolite-albite granite(PLAG)in the Himalayan leucogranite belt,which marks the first occurrence of pollucite,a major cesium silicate mineral,in the Himalayan orogenic belt(China).The rock appears at the northern part of the Gyirong pluton,coexisting with the tourmaline-bearing two-mica granite(TMG).Primary rare-metal minerals include lepidolite(Li),spodumene(Li),pollucite(Cs),cassiterite(Sn),and microlite(Ta).Micas,mainly lithian muscovite to lepidolite,contain 4.07 wt.%Li_2O and 0.76 wt.%Rb_2O on *** average Li_2O content of the spodumene is 7.95 wt.%.Pollucite not only has an average Cs_2O content of 34 wt.%,but also has an elevated Rb_2O content of about 0.16 wt.%.Notably,this granite attains industrial grades for rare metals,specifically with Li_2O,Rb_2O,and Cs_2O contents of 0.49–1.19 wt.%,0.12–0.24 wt.%,and 0.69–2.33 wt.%,*** results of magmatic accessory cassiterite and monazite indicated that the PLAG was formed at 19–18 Ma,slightly later than the TMG(22–20 Ma)of the Gyirong ***,these two types of granites may form within the same magmatic system considering their pulsating intrusive contact,formation ages,and whole-rock and mineral chemical ***,the abundant presence of pollucite suggests that the PLAG experienced high degrees of magmatic *** comparison to the Pusila spodumene pegmatite in the Himalaya and the Yashan topaz-lepidolite granite in Jiangxi,South China,the Gyirong PLAG exhibits different whole-rock and mineral compositions,resulting from differences in source materials and fractionation ***,the difference in fluorine(F)content may determine the degree of rare-metal element *** discovery of Gyirong PLAG highlights multiple stages and types of rare-metal mineralization in the Himalayan leucogranite belt,which is controlled by the South Tibetan Detachment *** Cs-bearing geyserite deposit exp

关键词： Himalaya Pollucite Lepidolite Leucogranite Rare-metal elements

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Highly fractionated granites:Recognition and research

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Science China Earth Sciences 2017年第7期60卷 1201-1219页

作者： WU FuYuan liu xiaochi JI WeiQiang WANG JiaMin YANG Lei State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101 China College of Earth Sciences University of Chinese Academy of Sciences Beijing 100049 China

Granite is one of the most important components of the continental crust on our Earth; it thus has been an enduring studied subject in geology. According to present knowledge, granite shows a great deal of heterogeneity in terms of its texture,structure, mineral species and geochemical compositions at different scales from small dike to large batholith. However, the reasons for these variations are not well understood although numerous interpretations have been proposed. The key point of this debate is whether granitic magma can be effectively differentiated through fractional crystallization, and, if so, what kind of crystallization occurred during the magmatic evolution. Although granitic magma has high viscosity because of its elevated SiO2 content, we agree that fractional crystallization is effectively processed during its evolution based on the evidence from field investigation,mineral species and its chemical variations, and geochemical compositions. These data indicate that crystal settling by gravitation is not the only mechanism dominating granitic differentiation. On the contrary, flow segregation or dynamic sorting may be more important. Accordingly, granite can be divided into unfractionated, fractionated(including weakly fractionated and highly fractionated) and cumulated types, according to the differentiation degree. Highly fractionated granitic magmas are generally high in primary temperature or high with various volatiles during the later stage, which make the fractional crystallization much easier than the common granitic melts. In addition, effective magmatic differentiation can be also expected when the magma emplaced along a large scale of extensional structure. Highly fractionated granitic magma is easily contaminated by country rocks due to its relatively prolonged crystallization time. Thus, granites do not always reflect the characteristics of the source areas and the physical and chemical conditions of the primary magma. We proposed that h

关键词： Fractional crystallization Accumulation Highly fractionated granite Granitic magma Continental crustal evolution

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Zircon Record of Ocean-Continent Subduction Transition Process of Dulan UHPM Belt, North Qaidam

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Journal of Earth Science 2015年第5期26卷 617-625页

作者： Jianzhou Yang xiaochi liu Yuanbao Wu Yanling Sun Department of Earth Sciences China University of GeosciencesWuhan State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences

The North Qaidam UHPM（ultra-high pressure metamorphism） belt is a typical continental subduction-collision belt containing continental crust deep subduction metamorphic products and oceanic crust relics, And it is an ideal region to study the ocean-continent transition and exhumation mechanism of oceanic UHP rocks during continental deep subduction process. In this paper, we report integrated in situ U-Pb, Lu-Hf and O isotope analyses of zircons from a serpentinized harzburgite as well as U-Pb dating for zircons from a kyanite eclogite from the North Qaidam Dulan UHPM terrane, and use these data to discuss the ocean-continent transition and exhumation mechanisms of oceanic UHP rocks during continental deep subduction. The serpentinized harzburgite was dated at 448±9 Ma, consistent with 455±5 Ma age for the kyanite eclogite within analytical errors. Zircons from the serpentinized harzburgite have uniform 176Hf/177 Hf values ranging from 0.282 842 to 0.282 883 and εHf（t） values from 11.6 to 13.3. Zircon δ^18O values of the serpentinized harzburgite vary from 4.47‰ to 5.29‰, slightly lower than the value of 5.3‰±0.6‰ for the normal mantle zircon. These Hf-O isotopic features indicate that the protolith of the serpentinized harzburgite was derived from depleted-mantle source, and might have experienced high-temperature rock-water interaction. Therefore, the serpentinized harzburgite was possibly located in the lower part of an oceanic section. The serpentinized harzburgite and kyanite eclogite were both formed due to the subduction of oceanic crust. The UHP metamorphism occurred successively from the oceanic crust to continental crust rocks of the North Qaidam UHP terrane. Low-density serpentinized peridotite and continental rocks possibly have negative buoyancy and play a key effect on preservation and exhumation of high-density oceanic eclogite.

关键词： continental deep subduction ocean-continent transformation North Qaidam harzburgite eclogite

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A preliminary study of rare-metal mineralization in the Himalayan leucogranite belts, South Tibet

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Science China Earth Sciences 2017年第9期60卷 1655-1663页

作者： WANG RuCheng WU FuYuan XIE Lei liu xiaochi WANG JiaMin YANG Lei LAI Wen liu Chen State Key Laboratory for Mineral Deposits Research School of Earth Sciences and Engineering Nanjing University Nanjing 210023 China State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

The Himalayan leucogranite occurs as two extensive(>1000 km) E-W trending belts on the Tibetan Plateau with the unique features. The leucogranite comprised biotite granite, two-mica/muscovite granite, tourmaline granite and garnet granite, which have been identified in previous studies, as well as albite granite and granitic pegmatite that were identified in this investigation. Fifteen leucogranite plutons were studied and 12 were found to contain rare-metal bearing minerals such as beryl(the representative of Be mineralization), columbite-group minerals, tapiolite, pyrochlore-microlite, fergusonite, Nb-Ta rutile(the representative of Nb-Ta mineralization), and cassiterite(the representative of Sn mineralization) mainly based on the field trip,microscope observation and microprobe analysis. The preliminary result shows that the Himalayan leucogranite is commonly related to the rare-metal mineralization and warrants future investigation. Further exploration and intensive research work is important in determining the rare-metal resource potential of this area.

关键词： Leucogranite Beryl Columbite-group minerals Cassiterite Rare-metal mineralization Himalaya South Tibet

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Insights into the origin of purely sediment-derived Himalayan leucogranites:Si-O isotopic constraints

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Science Bulletin 2018年第19期63卷 1243-1245页

作者： xiaochi liu Xianhua Li Yu liu Lei Yang Qiuli Li Fuyuan Wu Huimin Yu Fang Huang State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China

Granite is the dominant rock type in Earth’s continental *** origin of granite can be directly or indirectly related to the fractional crystallization of mantle-derived basaltic melt or the reworking of pre-existing continental or oceanic crust, which contribute to the growth of continental crust. Among the various types of granites, the peraluminous leucogranites in the Himalayan orogen, which are high in SiO_2(>73%) and low in mafic minerals (<5%),

关键词：起源同位素沉积岩石类型花岗石外壳大陆玄武岩

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High-performance coherent population trapping clock based on laser-cooled atoms

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Chinese Physics B 2022年第4期31卷 267-271页

作者： xiaochi liu Ning Ru Junyi Duan Peter Yun Minghao Yao Jifeng Qu Center for Advanced Measurement Science National Institute of MetrologyBeijing 100029China National Time Service Center Chinese Academy of SciencesXi’an 710600China College of Metrology and Measurement Engineering China Jiliang UniversityHangzhou 310018China

We present a coherent population trapping clock system based on laser-cooled^(87)Rb *** clock consists of a frequency-stabilized CPT interrogation laser and a cooling laser as well as a compact magneto-optical trap,a highperformance microwave synthesizer,and a signal detection *** resonance signal in the continuous wave regime exhibits an absorption contrast of~50%.In the Ramsey interrogation method,the linewidth of the central fringe is31.25 *** system achieves fractional frequency stability of 2.4×10^(-11)/(√τ),which goes down to 1.8×10^(-13)at 20000 *** results validate that cold atom interrogation can improve the long-term frequency stability of coherent population trapping clocks and holds the potential for developing compact/miniature cold atoms clocks.

关键词： coherent population trapping atomic clock cold atoms microwave synthesizer

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Oxidations of two-dimensional semiconductors:Fundamentals and applications

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Chinese Chemical Letters 2022年第1期33卷 177-185页

作者： Junqiang Yang xiaochi liu Qianli Dong Yaqi Shen Yuchuan Pan Zhongwang Wang Kui Tang Xianfu Dai Rongqi Wu Yuanyuan Jin Wei Zhou Song liu Jian Sun School of Physics and Electronics Central South UniversityChangsha 410083China State Key Laboratory of Chemical Biosensing and Chemometrics College of Chemistry and Chemical EngineeringInstitute of Chemical Biology and Nanomedicine(ICBN)Hunan UniversityChangsha 410082China

Since the discovery of graphene,two-dimensional(2D)semiconductors have been attracted intensive interest due to their unique *** have exhibited potential applications in next generation electronic and optoelectronic ***,most of the 2D semiconductor are known to suffer from the ambient oxidation which degrade the materials and therefore hinder us from the intrinsic materials’properties and the optimized performance of *** this review,we summarize the recent progress on both fundamentals and applications of the oxidations of 2D *** begin with the oxidation mechanisms in black phosphorus,transition metal dichalcogenides and transition metal monochalcogenides considering the factors such as oxygen,water,and *** we show the commonly employed passivation *** the end,the emerging applications utilizing controlled oxidations will be introduced.

关键词： Two-dimensional materials Oxidation Passivation Surface modification Doping

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基于ArcEngine的油气专题制图系统设计与实现

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测绘学报 2015年第B12期44卷 129-134,142页

作者：刘小驰邢廷炎中国地质大学(北京)信息工程学院北京100083

为进一步提升国土资源管理工作数字化水平,及时反映全国各石油公司矿区管理现状和各类油气资源勘查开采成果,按照国土资源部油气中心对自动化制图的具体需求,在深入研究ArcEngine功能和特点的基础上,提出一种基于ArcGIS平台的石油天然... 详细信息

为进一步提升国土资源管理工作数字化水平,及时反映全国各石油公司矿区管理现状和各类油气资源勘查开采成果,按照国土资源部油气中心对自动化制图的具体需求,在深入研究ArcEngine功能和特点的基础上,提出一种基于ArcGIS平台的石油天然气专题自动制图系统的设计方案,利用油气矿权区块空间位置信息、地理底图、制图模板以及当前油气资源各类属性信息,制作油气管理专题地图。经运行测试,制图效果美观科学,系统操作简洁流畅,全面满足石油天然气专题制图要求,实现"以图管矿"。

关键词：油气矿区 A rcEngine Geodatabase 专题制图

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青藏高原锂资源成岩-成矿作用研究进展:前言

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岩石学报 2024年第2期40卷 339-346页

作者：赵俊兴刘小驰中国科学院地质与地球物理研究所矿产资源研究院重点实验室北京100029 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室北京100029

近年来,我国青藏高原及邻区锂矿找矿与勘查取得系列重要突破和发现。除传统的盐湖锂资源外,川西、喀喇昆仑、阿尔金、柴北缘、喜马拉雅等地花岗岩-伟晶岩型锂资源成为了新的研究与勘查热点。这些新区带内硬岩型锂矿床的发现和增储,能够... 详细信息

近年来,我国青藏高原及邻区锂矿找矿与勘查取得系列重要突破和发现。除传统的盐湖锂资源外,川西、喀喇昆仑、阿尔金、柴北缘、喜马拉雅等地花岗岩-伟晶岩型锂资源成为了新的研究与勘查热点。这些新区带内硬岩型锂矿床的发现和增储,能够更好地满足当前国家低碳能源金属资源安全保障的战略需求,并成为突破我国优质能源金属资源的有效途径。

关键词：盐湖锂资源锂矿床阿尔金喀喇昆仑安全保障青藏高原优质能源战略需求

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Paleoproterozoic mafic dyke from Kongling terrain in the Yangtze Craton and its implication

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Chinese Science Bulletin 2009年第5期54卷 1098-1104页

作者： PENG Min WU YuanBao WANG Jing JIAO WenFang liu xiaochi YANG SaiHong State Key Laboratory of Geological Processes and Mineral Resources Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China

Mafic dyke is a sign of regional extension, and thus has important tectonic significance. A great amount of mafic dykes occur in the Kongling terrain of the Yangtze Craton, which have great bearing on the early evolution of the Yangtze Craton. Their ages, however, have not been well constrained. In this paper we report an integrated study of zircon U-Pb age and Hf isotope compositions for a mafic dyke in the Kongling terrain. The zircons yielded a weighted mean 207Pb/206Pb age of 1852±11Ma, which represents its intrusion age. They have εHf(t) values of -6.3 to 0.5, with a weighted mean of -3.06±0.88, suggesting that the mafic dyke came from metasomatic mantle. The results indicate that the Yangtze Block had transformed into post-collisional extensional regime at ca. 1850 Ma. In the same period, the Yangtze Craton shows enough rigidity to produce brittle rupture, and thus has the characteristics of a craton.

关键词：扬子克拉通镁铁质古地形岩墙加权平均同位素组成构造意义早期演化

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