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Transformation of olivine to diopside via interaction with carbonatite melts

Science China Earth Sciences 2023年第10期66卷 2332-2339页

作者： Jing WANG Ben-Xun SU Sanjeewa P.K.MALAVIARACHCHI Patrick Asamoah SAKYI Prasanna L.DHARMAPRIYA Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China University of Chinese Academy of Sciences Beijing100049China Department of Geology Faculty of ScienceUniversity of PeradeniyaPeradeniya20400Sri Lanka Department of Earth Science School of Physical and Mathematical SciencesUniversity of GhanaLegon-AccraGhana

Numerous empirical and experimental studies have documented the consumption of orthopyroxene and production of clinopyroxene in mantle peridotite during carbonatite metasomatism,whereas little attention has been paid to whether and how olivine is compositionally modified through the same process of carbonatite ***,we present the discovery of well-preserved reaction features in olivine from typical calciocarbonatites from Sri *** olivine grains experienced serpentinization along the cracks and in their rims and are generally surrounded outwardly by serpentine,tremolite and diopside *** inner serpentine zone is dominated by serpentine with tiny magnetite,whereas the mantle tremolite zone is characterized by euhedral tremolite and intergrowth of dolomite with small amounts of serpentine relics and *** outer diopside zone shows spongy texture and commonly encloses olivine,serpentine,tremolite and dolomite,which are also observed in interstitial diopside grains in the *** profile analyses reveal that these olivine grains display decreasing FeO and increasing MgO contents and thus elevating Fo values from their cores to the reaction rims,while the serpentine inherits compositions from the *** mapping images demonstrate outward diffusion of Si and Mg in the serpentine zones and contribution of Ca from carbonatite melts during tremolite *** interaction with carbonatite melts produced Si-and Mg-poor and Ca-rich diopside relative to the reactant *** observations suggest that the interaction with carbonatite melts first transformed olivine to diopside through serpentinization,followed by *** diopside formed through olivine-carbonatite melt interaction is anomalously depleted in Na and Al and enriched in Ca,which are distinct from those generated in interactions between orthopyroxene and both carbonatite and silicate *** implies that for the first time some w

关键词： Olivine Carbonatite diopside Tremolite Melt-mineral interaction

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FLOTATION SEPARATION OF WOLLASTONITE FROM diopside

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Journal of Wuhan University of Technology(Materials Science) 1994年第1期9卷 59-64页

作者：袁继祖曹明礼袁楚雄 Wuhan Univ of Tech. China

The floatabilities of single mineral samples of Tvollas-tonite and diopside have been studied with addition of a cationic collector , dodecylamine hydrochloride (DDA ?HC1) , and modifiers. A mixture of two minerals was successfully separated , when DDA ?HC1 and tannic acid (as depressant)were used together . The interaction between tannic acid and wollastonite and diopside in the pulp and the adsorption of tannic acid on the surface of the two minerals was sttidide with the help of ultra-violet (UV) spectroscopy and X-ray photoelectron spectroscopy (XPS) , re-spectively.

关键词： wollastontte diopside flotation

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The breakdown of diopside to(Ca,Mg)SiO_(3)perovskite–(Mg,Ca,Fe)SiO_(3)glass–(Mg,Ca)SiO_(3)glass–(Mg,Ca)SiO_(3)majorite in a melt vein the Suizhou L6 chondrite

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Acta Geochimica 2023年第2期42卷 183-194页

作者： Xiande Xie Xiangping Gu Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China

The Suizhou meteorite is a heavily shocked and melted vein-containing L6 *** contains a minor amount of diopside with a(Ca_(0.419)Mg_(0.466)Fe_(0.088))SiO_(3)composition,and a shock-metamorphosed diopside grain associated with ringwoodite and lingunite was found in a melt vein of this *** electron microprobe,transmission electron microscopic and Raman spectroscopic analyses revealed four silicate phases with different compositions and structures inside this shock-metamorphosed diopside grain,termed phase A,B,C and D in this *** A is identified as orthorhombic(Ca_(0.663)-Mg_(0.314))SiO_(3)-perovskite which is closely associated with phase B,the vitrified(Mg_(0.642)Ca_(0.290)Fe_(0.098))SiO_(3)*** D is assigned to be(Mg_(0.578)Ca_(0.414))SiO_(3)majorite which is associated with phase C,the vetrified Carich Mg-perovskite with a(Mg_(0.853)Ca_(0.167))SiO_(3)*** on high-pressure and high-temperature experiments,the diopside grain in the melt vein of the Suizhou meteorite would have experienced a P–T regime of 20–24GPa and 1800–>2000℃.Such P–T conditions are high enough for the decomposition of the diopside and the formation of four different silicate *** orthorhombic(Ca_(0.663)Mg_(0.314))SiO_(3)perovskite found in the Suizhou L6 chondrite might be considered as the third lower-mantle silicate mineral after bridgmanite and davemaoite after the detailed analyses of its crystal structure and physical properties being completed.

关键词： Suizhou chondrite diopside Shock metamorphism (Ca,Mg)SiO_(3)-perovskite (Mg,Ca,Fe)SiO_(3)glass (Mg,Ca)SiO_(3)glass (Mg,Ca)SiO_(3)majorite

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ANALOG STUDY ON THE DEPRESSING MECHANISM OF TANNIN TO diopside

引用

Journal of Wuhan University of Technology(Materials Science) 1996年第1期11卷 36-41页

作者：曹明礼袁继祖袁楚雄 Wuhan Univ of Technology Wuhan China

The depression mechanisms of tannin on the diopside surface have been studied by the rise of Infrared spectroscopy (IR), simulated pulp and mixed solution tests, It is found that the first order hydroxy completes of calcium are able to interact with tannin, and to form chemical complexes. es. The functional groups in tannin molecules participating in the chemical complexation are the hydroxyl groups, and carboxyl groups derived from the hydrolysis of hydroxyl groups.

关键词： tannin diopside depression mechanisms

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Exsolutions of diopside and Magnetite in Olivine from Mantle Dunite,Luobusa Ophiolite,Tibet,China

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Acta Geologica Sinica(English Edition) 2008年第2期82卷 377-384页

作者： REN Yufeng CHEN Fangyuan YANG Jingsui GAO Yuanhong Key Laboratory of Continental Dynamics of the Ministry of Land and Resources Institute of Geology CAGS Beijing 100037

The exsolutious of diopside and magnetite occur as intergrowth and orient within olivine from the mantle dunite, Luobusa ophiolite, Tibet. The dunite is very fresh with a mineral assemblage of olivine （〉95%）＋ chromite （1%-4%）＋ diopside （〈1%）. Two types of olivine are found in thin sections： one （Fo = 94） is coarse-grained, elongated with development of kink bands, wavy extinction and irregular margins; and the other （Fo = 96） is fine-grained and poly-angied. Some of the olivine grains contain minor Ca, Cr and Ni. Besides the exsolutions in olivine, three micron-size inclusions are also discovered. Analyzed through energy dispersive system （EDS） with unitary analytical method, the average compositions of the inclusions are： Na20, 3.12%-3.84%; MgO, 19.51%-23.79%; Al2O3, 9.33%-11.31%; SiO2, 44.89%-46.29%; CaO, 11.46%-12.90%; Cr2O3, 0.74%-2.29%; FeO, 4.26%- 5.27%, which is quite similar to those of amphibole. diopside is anhedral f＇dling between olivines, or as micro-inclusions oriented in olivines. Chromite appears euhedral distributed between olivines, sometimes with apparent compositional zone. From core to rim of the chromite, Fe content increases and Cr decreases; and A! and Mg drop greatly on the rim. There is always incomplete magnetite zone around the chromite. Compared with the nodular chromite in the same section, the euhedral chromite has higher Fe3O4 and lower MgCr2O4 and MgAI2O4 end member contents, which means it formed under higher oxygen fugacity environment. With a geothermometer estimation, the equilibrium crystalline temperature is 820℃-960℃ for olivine and nodular chromite, 630℃-770℃ for olivine and euhedral chromite, and 350℃-550℃ for olivine and exsoluted magnetite, showing that the exsolutions occurred late at low temperature. Thus we propose that previously depleted mantle harzburgite reacted with the melt containing Na, Al and Ca, and produced an olivine solid solution added with Na^＋, Al^3＋, Ca^2＋, Fe^3＋, Cr^3＋. With temperature decreasing, t

关键词： diopside magnetite exsolution olivine dunite ophiolite Luobusa Tibet

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3D printing of Mg-substituted wollastonite reinforcing diopside porous bioceramics with enhanced mechanical and biological performances

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Bioactive Materials 2016年第1期1卷 85-92页

作者： Dongshuang He Chen Zhuang Sanzhong Xu Xiurong Ke Xianyan Yang Lei Zhang Guojing Yang Xiaoyi Chen Xiaozhou Mou An Liu Zhongru Gou Bio-nanomaterials and Regenerative Medicine Research Division Zhejiang-California International Nanosystem InstituteZhejiang UniversityHangzhou310058China Department of Orthopaedic Surgery The First Affiliated HospitalSchool of Medicine of Zhejiang UniversityHangzhou310003China Rui'an People's Hospital The 3rd Hospital Affiliated to Wenzhou Medical CollegeRui'an325200China Clinical Research Institute Zhejiang Provincial People's HospitalHangzhouZhejiang310014PR China Department of Orthopaedic Surgery Second Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou310009China

Mechanical strength and its long-term stability of bioceramic scaffolds is still a problem to treat the osteonecrosis of the femoral *** the long-term stability of diopside(DIO)ceramic but poor mechanical strength,we developed the DIO-based porous bioceramic composites via dilute magnesium substituted wollastonite reinforcing and three-dimensional(3D)*** experimental results showed that the secondary phase(i.e.10%magnesium substituting calcium silicate;CSM10)could readily improve the sintering property of the bioceramic composites(DIO/CSM10-x,x=0-30)with increasing the CSM10 content from 0%to 30%,and the presence of the CSM10 also improved the biomimetic apatite mineralization ability in the pore struts of the ***,the flexible strength(12.5 -30 MPa)and compressive strength(14-37 MPa)of the 3D printed porous bioceramics remarkably increased with increasing CSM10 content,and the compressive strength of DIO/CSM10-30 showed a limited decay(from 37 MPa to 29 MPa)in the Tris buffer solution for a long time stage(8 weeks).These findings suggest that the new CSM10-reinforced diopside porous constructs possess excellent mechanical properties and can potentially be used to the clinic,especially for the treatment of osteonecrosis of the femoral head work as a bioceramic rod.

关键词： diopside Dilute magnesium substituting wollastonite Mechanical properties Porous bioceramics 3D printing Osteonecrosis of the femoral head

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Rare-earth Cerium Additives for Sinterability of Anorthite-diopside Ceramics

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China's Refractories 2018年第2期27卷 18-25页

作者： LIU Jie GAO Zhijian ZHANG Xiangwen Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemica Engineering and TechnologyTianjin UniversityTianjin 300072China Tianjin Municipal Engineering Design&Research Institute Tianjin 300051China

Anorthite -diopside ceramics were prepared by sintering iron ore railings, calcium carbonate, and silicon dioxide. Rare-earth cerium nitrate was evaluated as a sintering additive for the ceramics, whose mass percentage was 3% , 5%, 7% , 9% , and 11% , respectively. The sinterability of anorthite - diopside ceramics during heat treatment was confirmed hy X-ray diffiaction, transmission^scanning electron micrascopy, thermogravi- metric analysis- differential thermal analysis, and hotstage microscopy, respectively. The obtained results show that the density of ceramics gradnally increases, while the sintering temperature and sintering activation energy of anorthite -diopside ceramics are notably decreased with the increasing cerium content. Rare-earth cerium not only is beneficial to the complete reaction of raw materials, but a/so can accelerate the mass transfer process through forming eutectic phase with aluminum.

关键词： anorthite diopside cerium eutectic phase sintering

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Photocatalytic activity of Fe-doped diopside

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Transactions of Nonferrous Metals Society of China 2012年第12期22卷 3053-3058页

作者：杨合杨泽健韩冲李强薛向欣东北大学材料与冶金学院沈阳110819 中国科学院生态环境研究中心北京100085

UV-visible light induced photocatalytic degradation of methylene blue (MB) over Fe-doped diopside was investigated. The structure, composition, morphology and absorption property of UV-visible light of as-prepared samples were characterized using XRD, SEM, FTIR and UV-vis DRS. The experimental results show that doping Fe3+ induced the formation of some new species in diopside, and promoted light adsorption property of diopside in UV-visible region. Photochemical reactivity of Fe-doped diopside obviously depended on the content of doping Fe3+. The diopside with 1.848% Fe3+ exhibited the superior photocatalytic activity with 95% degradation of MB under UV-visible light for 3 h. The photocatalytic degradation kinetics of MB over all samples showed the first-order reaction nature.

关键词： diopside methylene blue Fe3+ photocatalysis photocatalytic activity kinetics first-order reaction

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STUDY ON SOLUTION CHEMISTRY BETWEEN TANNIC ACID AND THE FLOTATION PULP OF WOLLASTONITE AND diopside

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Journal of Wuhan University of Technology(Materials Science) 1993年第2期8卷 34-39页

作者：袁继祖曹明礼袁楚雄 Dept. cf Mineral Resource and Engineering Wuhan University of Technology

The mechanisms of interaction between tannic acid and calcium ions either added externally to or inherently present in the (?)olution ( dissociated from mineral surface ) , are studied by the use of Inductively Coupled Plasma Atomic Emission Spectroscopy ( ICP-AES ) , Ultraviolet Spectroscopy (UV). It is found that wollastonite has a high solubility in the concentration of calcium ions, calcium ions are able to interact with tannic acid.

关键词： wollastonite diopside tannic acid solution chemistry.

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Elastic Properties of Clinopyroxene Based Glasses along diopside (CaMgSi2O6)-Jadeite (NaAlSi2O6) Join

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Journal of Minerals and Materials Characterization and Engineering 2012年第3期11卷 267-284页

作者： Rinkel Jindal Widiya Jatmiko Indra Vir Singh R. Jayaganthan Department of Glass and Ceramic Composites Institute of Mineral Engineering RWTH Aachen Mauerstr. 5 52064 Aachen Germany Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee Roorkee 247667 India Department of Metallurgical and Materials Engineering & Centre of Nano-technology Indian Institute of Technology Roorkee Roorkee 247667 India

The elastic properties of glasses along diopside (CaMgSi2O6)-Jadeite (NaAlSi2O6) join (Dix - Jd1-x where x=20, 40, 60, 80, 100 mole %), were obtained by the ultrasonic echography technique, at room temperature. The correlation of elastic moduli with the atomic packing density of these glasses was discussed. The derived experimental values of Young’s modulus, bulk modulus, shear modulus and Poisson’s ratio for investigated glasses were compared with those theoretically calculated values in terms of the Makishima–Mackenzie model and the modified model presented by Rocherulle.

关键词： Glass diopside Mechanical properties

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