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Crystal Growth and Crystallization Time Scales of the panzhihua Layered Intrusion:Constraint from Crystal Size Distribution

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Acta Geologica Sinica(English Edition) 2020年第5期94卷 1428-1439页

作者： LI Xuejun LUO Zhaohua LI Xiaowei WANG Yu YANG Zongfeng LI Jie LIU Xiao State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China

The panzhihua layered intrusions is generated closely related to the Emeishan *** paper analyzes the spatial distribution of plagioclase and *** quantitative texture analysis of 2209 plagioclase shows that the characteristic length of plagioclase is 0.54 to 0.96 mm,the intercept variation range is large,from-0.67 to 0.96,and the slope is-1.85 to-1.04,the Aspect Ratio shows from 1.84 to 2.59 and fractal dimension D is 1.908–*** quantitative texture analysis of 2342 pyroxene shows that the characteristic length of pyroxene is 0.38–0.64 mm,the intercept shows from 0.46 to 2.26,The slope ranges from-2.6 to-1.47,the Aspect Ratio value varies from 1.53 to 1.71,the fractal dimension D is 0.93 to *** the CSDs results of the panzhihua intrusions indicate that plagioclase and pyroxene form in an open magma system and undergo four replenishment of magma *** plagioclase crystals do not grow as the lathlike shape,and the fractal growth leads to complex crystal *** plagioclase undergoes deformation compaction during the crystal process,and then is *** pyroxene crystals grow along an approximately triaxial ratio and undergo texture adjustment and small crystal dissolution *** all crystals in magma system grows up to 2 mm,the pyroxene undergoes cumulation in the panzhihua layered *** plagioclase crystallization time scale is 171.23–304.41 years,representing that the crystallization is the more uniform in central part of the *** nucleation density continuously increases during the crystallization process of the magma *** time scale to reach the final maximum crystal nucleation density is 15.28–58.98 years.

关键词： crystal size distribution crystallization time scales layered intrusions Emeishan large igneous province panzhihua

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Petrology and geochemistry at the Lower zone-Middle zone transition of the panzhihua intrusion,SW China:Implications for differentiation and oxide ore genesis

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Geoscience Frontiers 2013年第5期4卷 517-533页

作者： Kwan-Nang Pang Mei-Fu Zhou Liang Qi Sun-Lin Chung Chiu-Hong Chu Hao-Yang Lee Department of Geosciences National Taiwan University Department of Earth Sciences The University of Hong Kong Institute of Geochemistry Chinese Academy of Sciences

A sequence of gabbros showing isotropic,layered and fine-grained textures is exposed in the Nalaqing mine at the southern tip of the～260 Ma panzhihua intrusion,SW *** field relations,structure,texture and mineralogy of the rocks indicate that the sequence represents the transition between the Lower zone and Middle zone of the *** gabbros characteristic of the Lower zone pass upward to layered gabbros of the Middle zone through a～5 m-thick microgabbro sheet,within and close to which small-scaled, concordant Fe-Ti oxide ore horizons are *** fractionation between HFSE and REE in a subset of samples is ascribed to cumulus titanomagnetite into which HFSE are preferentially incorporated over REE,as reflected in the parallel relations between Nb/La,Hf/Sm and Ti/Ti＊.Both the isotropic and layered gabbros display cumulate textures and have similar mineral compositions（Mg# of clinopyroxene =～76-79 and An59-61）,isotopic compositions[（87Sr/86Sr）i = 0.7044-0.7045 andεNd（t） = ＋2.4 to ＋3.9]and trapped liquid contents inferred from Zr abundance（～17-34 ppm）.However,there are substantial variations in elemental abundances（V,Cr and PGE） and ratios（Ti/V,La/Yb,Ba/Y and Cu/Pd） between the two types of gabbros,features that cannot be explained by cumulate formation from a common magma in a closed *** microgabbros generally resemble high-Ti Emeishan basalts in major element compositions,but their low trace element abundances indicate some lost of residual liquid is inevitable despite rapid nucleation and *** with available data and observations,we propose a model involving in-situ crystallization,followed by magma recharge and closed-system fractionation to explain the formation of texturally distinctive gabbros at Nalaqing and the evolution of the lower part of the panzhihua intrusion.

关键词： Fe-Ti oxides Layered intrusion Microgabbro panzhihua Emeishan

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Melting of carbonate wall rocks and formation of the heterogeneous aureole of the panzhihua intrusion,China

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Geoscience Frontiers 2013年第5期4卷 535-546页

作者： Clement Ganino Nicholas T.Arndt Catherine Chauvel Alexandre Jean Charlotte Athurion Geoazur Universite de Nice-Sophia AntipolisCNRS/IRD250 rue Albert Einstein06560 ValbonneFrance ISTerre Grenoble UniversitesCNRS/IRDBP 5338041 GrenobleCedex 9France

The panzhihua gabbroic intrusion,part of the plumbing system of the Emeishan large igneous province, intruded late-Proterozoic dolomites and marls about～263 Ma *** dolomites in the contact aureole were converted to brucite marbles and a diverse suite of forsterite,diopside and garnet *** variation in mineralogy is explained in part by differences in the composition of the protolith,particularly the proportion of silica minerals and clay,and in part by transfer of elements from intruding *** trace element compositions of most marbles and skarns are very similar to those of unmetamorphosed dolomites and marls,but some contain high Si,Ti,and Fe contents that are interpreted to have come from a magmatic *** brucite marbles sampled～10 m from the contact of the intrusion and named ＂enriched brucite marble＂ have trace element compositions very different from their dolomitic protolith：their rare earth elements are strongly enriched whereas levels of Nb-Ta,Zr-Hf and Ti are very *** characteristics resemble those of carbonate liquid in equilibrium with silicate liquid or more probably with silicate minerals in the case of panzhihua,a similarity we take to indicate that the sample underwent partial *** taken up to 300 m from the contact contain brucite indicating that high temperatures persisted well into the country ***,other samples collected only tens of metres from the contact are only slightly recrystallized indicating that conditions in the aureole were highly *** suggest that temperatures within the aureole were controlled by conduction of heat from the main intrusion and by supply of additional heat from abundant small dykes within the *** of fluids derived from deeper levels in the aureole flushed the carbon dioxide from the dolomite,lowering temperature needed to partially melt carbonate to the temperatures attained near the *** but extensive heating destabilized the carbon

关键词： panzhihua Melting Carbonates Contact aureole Thermal metamorphism Petrology

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Assimilation of carbonate country rock by the parent magma of the panzhihua Fe-Ti-V deposit(SW China):Evidence from stable isotopes

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Geoscience Frontiers 2013年第5期4卷 547-554页

作者： Clement Ganino Chris Harris Nicholas T.Arndt Stephen A.Prevec Geoffrey H.Howarth Geoazur Universite de Nice-Sophia AntipolisCNRS/IRD250 rue Albert Einstein 06560 ValbonneFrance Department of Geological Sciences University of Cape TownRondebosch 7701South Africa ISTerre Grenoble UniversitesCNRS/IRD BP 53 38041 Grenoble CEDEX 9France Department of Geology Rhodes UniversityGrahamstown 6140South Africa

The panzhihua intrusion in southwest China is part of the Emeishan Large Igneous Province and host of a large Fe-Ti-V ore *** emplacement of the main intrusion,multiple generations of mafic dykes invaded carbonate wall rocks,producing a large contact *** measured the oxygen-isotope composition of the intrusions,their constituent minerals,and samples of the country *** and plagioclase from panzhihua intrusion haveδ18O values that are consistent with magmatic equilibrium, and formed from magmas withδ18O values that were 1-2‰higher than expected in a mantle-derived *** unmetamorphosed country rock has highδ18O values,ranging from 13.2‰（sandstone） to 24.6-28.6‰（dolomite）.The skarns and marbles from the aureole have lowerδ18O andδ13C values than their protolith suggesting interaction with fluids that were in exchange equilibrium with the adjacent mafic magmas and especially the numerous mafic dykes that intruded the *** would explain the alteration ofδ18O of the dykes which have significantly higher values than expected for a mantle-derived *** on the exactδ18O values assumed for the magma and contaminant, the amount of assimilation required to produce the elevatedδ18O value of the panzhihua intrusion was between 8 and 13.7 wt.%,assuming simple *** exact mechanism of contamination is unclear but may involve a combination of assimilation of bulk country rock,mixing with a melt of the country rock and exchange with CO2-rich fluid derived from decarbonation of the marls and *** mechanisms,particularly the latter,were probably involved in the formation of the Fe-Ti-V ores.

关键词： panzhihua Stable isotopes Carbonates Assimilation Contamination

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Was the panzhihua Large Fe-Ti Oxide Deposit,SW China,Formed by Silicate Immiscibility?

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Acta Geologica Sinica(English Edition) 2023年第5期97卷 1451-1461页

作者： DING Xiangli CHEN Xuanhua SHAO Zhaogang Chinese Academy of Geological Sciences Beijing 100037China

The panzhihua mafic intrusion,which hosts a world-class Fe-Ti-V ore deposit,is in the western Emeishan region,SW *** formation age(~260 Ma),and Sr and Nd isotopes indicate that the panzhihua intrusion is part of the Emeishan large igneous province and has little crustal *** assess ore genesis of the panzhihua Fe-Ti-V ore deposit,two different models have been provided to explain the formation,namely silicate immiscibility and normal fractional *** immiscibility occurring around 1,000℃at the late stage of basaltic magma evolution argues against the silicate immiscibility ***-hosted melt inclusion research indicates that silicate immiscibility occurred at the late stage of panzhihua magma evolution,which may not have offered potential to form such large ore deposits as ***,continuous compositional variations of the panzhihua intrusion and calculations using thermodynamic modelling software support the hypothesis that the panzhihua deposit was formed by normal fractional *** trace element patterns of the panzhihua intrusion and nearby felsic rocks also coincide with the fractional crystallization *** fractional crystallization of high-Ti basaltic magma played a key role in the formation of the panzhihua Fe-Ti-V ore deposit.

关键词： liquid immiscibility fractional crystallization mafic intrusion Fe-Ti oxide deposit panzhihua

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Hydration ***:Modelling implications for Fe-Ti oxide crystallisation in mafic intrusions,with specific reference to the panzhihua intrusion,SW China

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Geoscience Frontiers 2013年第5期4卷 555-569页

作者： Geoffrey H.Howarth Stephen A.Prevec Geology Department Rhodes UniversityP.O.Box 94Grahamstown 6140South Africa

Recent work on the panzhihua intrusion has produced two separate models for the crystallisation of the intrusion：（1） low-Ti,high CaO and low H2O（0.5 wt.%） parent magma（equivalent to Emeishan low-Ti basalt） at FMQ;and（2） high-Ti,low CaO and higher H2O（＆gt;1.5 wt.%） parent magma（equivalent to Emeishan high-Ti basalt） at FMQ ＋ *** of these parent magma compositions produces significantly different results. We present here detailed f（O2） and H2O modelling for average compositions of both Emeishan high-Ti and low-Ti ferrobasalts in order to constrain the effects on crystallisation sequences for Emeishan ultra-mafic -mafic layered *** is consistent with numerous experimental studies on ferro-basaltic magmas from other localities（*** intrusion）.Modelling is compared with the geology of the panzhihua intrusion in order to constrain the crystallisation of the gabbroic rocks and the Fe-Ti oxides ore *** suggest that the gabbroic rocks at the panzhihua intrusion can be best explained by crystallisation from a parent magma similar to that of the high-Ti Emeishan basalt at moderate H2O contents（0.5-1 wt.%） but at the lower end of TiO2 content for typical high-Ti basalts（2.5 wt.%TiO2）. Distinct silicate disequilibrium textures in the Fe-Ti oxide ore layers suggest that an influx of H2O may be responsible for changing the crystallisation *** increase in H2O during crystallisation of gabbroic rocks will result in the depression of silicate liquidus temperatures and resultant disequilibrium with the *** cooling of the magma with high H2O then results in precipitation of Mt-Uv alone. The H2O content of parent magmas for mafic layered intrusions associated with the ELIP is an important variable.H2O alters the crystallisation sequence of the basaltic magmas so that at high H2O and f（O2） Mt -Uv crystallises earlier than plagioclase and ***,the addition of H2O to an anhydrous magma can explain silicate dis

关键词： f(O2) H2O panzhihua Parent magma Fe-Ti oxide ore Petrogenesis

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ON DEVELOPING ENVIRONMENT AND RESOURCE DEVELOPMENT OF panzhihua

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Chinese Geographical Science 1996年第2期6卷 120-131页

作者：黄静 Regional Economic Institute People’s University of China Beijing PRC

panzhihua is a resource treasure basin and natural green house of *** demands of international market and domestically economic constructions are the important prerequisites of developing panzhihua’s *** more than 20 years construction,the city has laid a sound bases for resource utilization. In order to enlarge the functions of panzhihua’s resources in national economy and to promote the Changjiang(Yangtze)River Industry Zone construction,China will develop panzhihua resources actively and *** analysis,key related projects of resource development and required facilities of improving the environment of investing and specialist nursing are listed in this paper.

关键词： panzhihua resources development developing environment

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Spatial Development Structure and Value Assessment Research of Tourism Resources in panzhihua City

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Journal of Landscape Research 2013年第Z3期5卷 39-42页

作者： HUAN Shaojun WANG Wenjing Tourism College Kunming University

On the basis of analyzing categories and distribution of tourism resources in panzhihua City,spatial distribution features of the resources were explored,and spatial combination laws proposed pertinently,quantitative and qualitative methods used to evaluate value of tourism resources in the city,and suggestions given for the hierarchical development of local tourism resources.

关键词： panzhihua Tourism resources Spatial distribution Value assessment

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Analysis on Variation Characteristics of Natural Precipitation Resources in panzhihua City

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Meteorological and Environmental Research 2010年第9期1卷 12-14页

作者：陈永琼李阜樯杜成勋彭光辉四川省攀枝花市气象局四川攀枝花617000

Affected by southwest monsoon moisture and topography redistribution,natural precipitation in panzhihua had obvious difference in temporal and spatial *** using precipitation data from Renhe station in panzhihua during 1965-2009,the variation characteristics of annual precipitation,flood season precipitation and seasonal precipitation were *** results showed that spring precipitation,summer precipitation,flood season precipitation and annual precipitation changed conformably and significantly since 1970s in 20th century,showing increase trend at present,while autumn precipitation showed decrease *** the 10-year running mean of annual precipitation,it was found that the annual variation of precipitation resources in panzhihua City had its own regularity,and there was a slowly decrease at present.

关键词： panzhihua Natural precipitation Variation characteristic China

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Study on Flue-cured Tobacco Young Seedlings Cultivation Technique in Tobacco-producing Areas of panzhihua

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Agricultural Science & Technology 2015年第4期16卷 700-704页

作者：潘兴兵张宗锦官宇四川省烟草公司攀枝花市公司四川攀枝花617099

Objective] This study almed to expIore a suitabIe fIue-cured tobacco young seedIings cuItivation technique for tobacco-producing areas in panzhihua. [Method] The randomized bIock design was used to conduct a two-factor test of fIoating pate and seedIing age. [Result] The young seedIings cuItivation technique re-duced the cuItivation cost by 76.6%; the optimum seedIing age was 45 d; the fIoat-ing pIate with specification of 595 hoIes/pIate couId best improve the cuItivation effi-ciency; and the Ieaf-uncut young seedIings cuItivation technique significantIy reduced the incidence of disease in tobacco pIants. In short, the production benefit of young seedIings cuItivation technique is significantIy higher than that of conventional tech-nique. [Conclusion] Referring to the young seedIings cuItivation techniques in Guizhou and Yunnan and according to the actual situation in tobacco-producing ar-eas of panzhihua, the fIue-cured tobacco young seedIings cuItivation technique, which was suitabIe for tobacco-producing areas of panzhihua, was deveIoped. This cuItivation technique can be used to provide tobacco seedIings for under-fiIm cuItiva-tion. In addition, it wiI provide a reference for reducing cuItivation costs, reducing environmental destruction, reducing incidence of disease and improving production efficiency of tobacco Ieaves.

关键词： panzhihua FIue-cured tobacco Young seedlings Cultivatlon

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