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Trace element partitioning between amphibole and hydrous silicate glasses at 0.6–2.6 GPa

Acta Geochimica 2019年第3期38卷 414-429页

作者： Bo Zhang Xianxu Hu Peng Li Qizhe Tang Wenge Zhou Key Laboratory for High Temperature and High Pressure Study of the Earth's Interior Institute of GeochemistryChinese Academy of Sciences University of Chinese Academy of Sciences Guizhou University of Finance and Economics Guizhou Institute of Technology

Partitioning behavior between amphibole and silicate glass of thirty-three minor and trace elements(Sc,Ti, V, Cr, Co, Rb, Sr, P, Y, Zr, Nb, Cs, Ba, K, La, Ce, Pr,Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, Pb,Th, and U) have been determined experimentally. Products of crystallization of hydrous basalt melts from 0.6 GPa/860 °C up to 2.6 GPa/970 °C were obtained in a multianvil apparatus. Major and trace element compositions of amphibole and glass were determined with a combination of electron microprobe and laser ablation inductively coupled plasma mass spectrometry. The main mineral phase is calcic amphibole, and the coexisting glass compositions are tonalite, granodiorite, and granite. The compatibility of rare earth elements increase at 915 °C and then decrease at 970 °C, but the compatibility of most of these elements shows a continued, significant increase with increasing pressure. For high-field strength elements, large ion lithophile elements, actinide compatibility decrease with increasing temperature or pressure, but transition metals show a continued increase in compatibility within the temperature–pressure conditions. From mathematical and graphical fitting, we determined best-fit values for the ideal ionic radius(r_0, 1.01–1.04 ?), the strain-free partitioncoefficient(D_0, 1.18–1.58), and apparent Young's modulus(E, 142–370 GPa) for the M4 site in amphibole according to the lattice strain model. The D_0^(M4) for rare earth elements rises at 915 °C and then drops at 970 °C at 0.6 GPa.However, the D_0^(M4) values are positively proportional to the pressure for rare earth elements in the amphibole-glass pairs at 0.6–2.6 GPa and 970 °C. Furthermore, the derived best-fit values for r_0^(M4) and E^(M4) are almost constant and trend to increase with rising temperature and pressure,respectively. The partition coefficient is distinctly different for different melt compositions. The rare earth elements become more enriched in amphibole if the quenched glass is granodiorite or granite compared to the ton

关键词： amphibole Silicate glass Trace elements Partition coefficients Lattice strain model

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Occurrence of Excess ^40Ar in amphibole： Implications of ^40Ar/^39Ar Dating by Laser Stepwise Heating and in vacuo Crushing

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Journal of Earth Science 2018年第2期29卷 416-426页

作者： Rong-Guo Hu Xiu-Juan Bai Jan Wijbrans Fraukje Brouwer Yi-Lai Zhao Hua-Ning Qiu College of Earth Sciences Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration Guilin University of Technology Guilin 541004 China Geology & Geochemistry Cluster Department of Earth Sciences VU Amsterdam De Boelelaan 1085 1081 HV Amsterdam The Netherlands Key Laboratory of Tectonics and Petroleum Resources Ministry of Education China University of Geosciences Wuhan 430074 China State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

ABSTRACT： The joint methods of ^40Ar/^39Ar laser stepwise heating and in vacuo crushing have been applied to date amphiboles from the North Qaidam ultra-high pressure metamorphic amphibolites. Two amphibole samples analyzed by laser heating yielded saddle-shaped age spectra with total gas ages of 574.5±2.5 and 562.5=±2.5 Ma. These ages are much older than the reported zircon U-Pb ages （-495 Ma） from Yuka eclogite, indicating the presence of excess ^40Ar. In order to decipher the occur- rence of excess ^40Ar and constrain the age of amphibolite-facies retrogression, two duplicate amphibole samples were further employed for ^40Ar/^39Ar in vacuo crushing analyses. Both samples exhibit similar monotonically declining release spectra, which are characterized by rapid decline of anomalously old apparent ages in the early steps. The data of the late steps yielded concordant apparent ages with pla- teau ages of 460.9±1.2 and 459.6±1.8 Ma. We interpret that gases released in the early steps derive from the significant excess ^40Ar containing secondary fluid inclusions （SFIs） due to their distribution characteristics along cracks leading to be easily extracted, whereas those released in the later steps rep- resent the contribution of the small primary fluid inclusions （PFIs）.

关键词： ^40Ar/^39Ar dating in vacuo crushing amphibole fluid inclusions.

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Experimental Study of Dissolution-Alteration of amphibole in a Hydrothermal Environment

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1933-1946页

作者： LI Yongli HUANG Fei GAO Wenyuan TANG Xu REN Yaqun MENG Lin ZHANG Zhibin Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines and School of Resources and Civil EngineeringNortheastern UniversityShenyang 110819China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Electron Microscope Laboratory Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

amphibole is a rock-forming mineral widely existing on the earth.It is easily dissolved and altered during the later stage of diagenesis and mineralization,and often forms chloritization,which is an important indicator for prospecting.To explore amphibole's dissolution process and alteration mechanism,dissolution experiments were carried out under acidic conditions using pargasite-rich amphibole as raw material,and the effects of temperature,p H,and experiment duration on amphibole alteration were investigated.Experimental samples and products were analyzed using X-ray diffractometer,field emission scanning electron microscope,electron probe micro analyzer,and transmission electron microscopy.It was found that many pores and erosion edges are produced after amphibole dissolution,and there is a clear interface between the dissolved residual portion and the parent.The dissolved residual portion remains in the amphibole phase,but as the temperature and time increase,the intensity of the diffraction peak of the phase in the product decreases,and the peak position shifts to a small angle.Many clay minerals such as chlorite and griffithite formed on the amphibole surface.In an environment with strong acidity(p H=3),the amount of chamosite increases with temperature(180℃→210℃→240℃),whereas clinochlore is only increased in a 150–210℃environment.Griffithite growth was observed in the acidic(p H=6)and low temperature(amphibole lattice or cracks to promote dissolution.The Al-poor and Ca-and Fe-rich regions between the edge and core of the amphibole are caused by dynamic equilibrium in amphibole dissolution and alteration process,which is an essential indicator for the beginning of amphibole dissolution-alteration.Diffusion and the coupled dissolution-reprecipitation mechanism accomplishes the process of dissolution and alteration to form clay minerals.The energy of the system determined by temperature and p H is the key to controlling the rate of growth an

关键词： hydrothermal environment amphibole dissolution-alteration chlorite griffithite

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Hydrogen isotope compositions of mantle-derived amphibole megacrysts from Qilin, Guangdong and its tectonic significance

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Chinese Science Bulletin 1999年第5期44卷 474-477页

作者： Qunke Xia Daogong Chen Deloule Etienne Xiachen Zhi Univ Sci & Technol China Dept Earth & Space Sci Hefei 230026 Peoples R China CNRS CRPG F-54501 Vandoeuvre Nancy France

Hydrogen isotope compositions of mantle-derived amphibole megacrysts from Qilin, Guang dong Province have been obtained by ion micro-probe. δD and H contents are constant both among different samples and within single sample, demonstrating that their formation condition is very stable.High δD values suggest the presence of a component recycled from crust which is possibly related to the subduction of Pacific Plate beneath Eurasian Plate in Mesozoic.

关键词： hydrogen isotope ion micro-probe amphibole megacryst.

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Libby amphibole Contamination in Tree Bark Surrounding Historical Vermiculite Processing Facilities

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Journal of Environmental Protection 2011年第8期2卷 1062-1068页

作者： Mohamed I. Elashheb Terry M. Spear Julie F. Hart James S. Webber Tony J. Ward 不详

Over a 70-year period, a mine near Libby, MT supplied nearly 80% of the world’s vermiculite. Raw vermiculite, which was contaminated with naturally occurring amphibole in veins throughout the deposit, was shipped to processing sites throughout the United States for exfoliation. In this pilot study, tree bark samples were collected near processing facilities in Spokane, WA, Santa Ana, CA, Newark, CA, and Phoenix, AZ in an effort to determine if areas surrounding these facilities are today contaminated with Libby amphibole asbestos (AA). From areas surrounding each of the four historical processing sites, Libby AA was detected in a subset of the bark samples. At the Santa Ana, Newark and Phoenix facilities, actinolite-tremolite and other high Fe Ca-bearing amphibole were also measured from the bark samples. In addition, chrysotile was frequently measured in samples collected from each of the sites. From the results of this pilot study, it is evident that tree bark can serve as reservoirs of asbestos, and indicators of past and current contamination. These data also suggest that areas outside of these historical processing facilities may today have some level of existing contamination resulting from the operation of these facilities.

关键词： Vermiculite Asbestos amphibole Libby Exfoliation Tree Bark

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Mineral Chemistry and Geothermometry of amphibole and Plagioclase in the Metabasites, Located at the Tanbour Metamorphic Complex in Southern Iran

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Open Journal of Geology 2015年第11期5卷 795-808页

作者： Kasra Safei Mohammad-Ali Arian Seyed Hesam-Aldin Moien Zadeh Mirhosseini Department of Geology Faculty of Science North Tehran Branch Islamic Azad University Tehran Iran Department of Geology Faculty of Science Kerman Branch Shahid Bahonar University Kerman Iran

Metabasite refers to metamorphosed basalts and other mafic igneous rocks (rich in iron and magnesium). When a mafic igneous rock is subjected to new pressure and temperature conditions during metamorphism, these chemical components will rearrange themselves to form new minerals. Metabasites can be found in many metamorphic belts including Sanandaj-Sirjan metamorphic belt of Iran. The study area is a Tanbour metamorphic complex in Eastern of Sirjan city, which is geologically located at the Sanandaj-Sirjan metamorphic belt in Southern Iran. Metabasite in this complex consists of greenschist, epidote amphibolite and amphibolite. amphibole and plagioclase are the main minerals in the greenschist and amphibolite, and the a secondary mineral in some micaschist seen in the study area. The electron microprobe analysis was done on this mineralization in greenschist, epidote amphibolite and amphibolite, which showed that the amphiboles in greenschist was a member of the calcic group and Actinolite type, and the amphiboles in epidote amphibolite was a member of the calcic group and these amphiboles were tschermakite up to Ferro-Tschermakite + Ferro-Hornblende type. The amphibole in amphibolite is a member of the calcic group and this amphibole is Magnesio-Hornblende type. The plagioclases in the greenschist is pure albite (An 3.29 - 3.6), and in the epidote amphibolite is oligoclase (An 19.5 - 24.2), while in the amphibolites is oligoclase (An 16.9 - 26.6). The estimated P–T conditions are in favor of their metamorphism under epidote amphibolite (550°C and 8 kbar) and amphibolite (611°C - 652° Cand 10.5 kbar) facies.

关键词： Metabasite amphibole Plagioclase Mineral Chemistry Tanbor Metamorphic Complex Sanandaj-Sirjan Metamorphic Belt

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Metasomatism of the peridotites from southern Mariana fore-arc:Trace element characteristics of clinopyroxene and amphibole

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Science China Earth Sciences 2007年第7期50卷 1005-1012页

作者： CHEN JunBing1,2 & ZENG ZhiGang1 1 Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China

Modal composition and mineral composition of harzburgites from the southern Mariana fore-arc show that they are highly refractory. There are a few modals of clinopyroxene (0.7 vol %) in harzburgites. Two types of amphibole are found in these harzburgites: magnesiohornblende accompanied by clinopy-roxene with higher Al2O3 content (>7%) and lower Mg#; tremolite around orthopyroxene with lower Al2O3 content (amphibole are ana-lyzed. Primitive mantle-normalised REE patterns for clinopyroxene and magnesio hornblende are very similar and both show HREE enrichment relative to LREE,while magnesiohornblende has higher con-tent of trace element than clinopyroxene. The contents of trace element of tremolite are much lower than those of magnesiohornblende. Clinopyroxene shows enrichment of most of the trace element except HREE and Ti relative to clinopyroxene in abyssal peridotites. Petrology and trace element characteristic of clinopyroxene and two types of amphibole indicate that southern Mariana fore-arc harzburgites underwent two stages of metasomatism. The percolation of a hydrous melt led to mobility of Al,Ca,Fe,Mg,Na,and large amounts of trace element. LILE and LREE can be more active in hydrous melt than HREE and Ti,and the activities of most of the trace element except some of LILE are influ-enced by temperature and pressure.

关键词： trace element clinopyroxene amphibole harzburgite metasomatism Mariana

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Hisingerite in Trachydacite from Tarim:Implications for Voluminous Felsic Rocks in Transitional Large Igneous Province

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Journal of Earth Science 2020年第5期31卷 875-883页

作者： Mingde Lang Zhiguo Cheng Zhaochong Zhang Fangyue Wang Qian Mao M.Santosh State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China Ore Deposit and Exploration Centre(ODEC) Hefei University of TechnologyHefei 230009China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Department of Earth Sciences University of AdelaideSA 5005Australia

Unlike the typical large igneous provinces(LIPs) that are dominated by mafic-ultramafic rocks, the Tarim large igneous province(TLIP) is characterized by a high proportion of felsic rocks, based on which the TLIP is classified as a transitional LIP. In this study, we focus on the trachydacite from the TLIP in which we report the characteristics of hisingerite employing a variety of techniques such as EMPA, LA-ICPMS, CCD single crystal diffraction, and bulk-rock oxygen isotopes. The hisingerite in this rock is associated with plagioclase, amphibole, apatite and ilmenite. These minerals occur as aggregates of fine curled fibers in micron-scale and display heavy rare earth elements(HREE) enriched signature with significant negative Eu anomalies. In the primitive mantle-normalized trace element spider diagrams, they show pronounced Th and U spikes and Nb, Zr, Hf troughs. Petrological observation and mineralogical study reveal a closely genetic relationship between hisingerite and amphibole, indicating that the hisingerite might have been derived from the breakdown of amphibole during the magma ascent. The formation of hisingerite requires excess water from the surrounding melts, suggesting a hydrous parental magma. The hisingerite and amphibole assign a hydrous crustal source for the rock, and extensive crustal melting accounts for the voluminous felsic rocks in the TLIP.

关键词： hisingerite amphibole trachydacite hydrous crust Tarim large igneous province

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Metasomatic Stages and Scapolitization Effects on Chemical Composition of Pasveh Pluton,NW Iran

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Journal of Earth Science 2011年第5期22卷 619-631页

作者： S A Mazhari S Amini J Ghalamghash F Bea Department of Geology Payame Noor University Department of Geology Tarbiat Moallem University Geological Survey of Iran Department of Mineralogy and Petrology Fuentenueva CampusUniversity of Granada

Pasveh gabbros are mafic component of a plutonic complex in the northwest Sanandaj- Sirjan Zone. These cumulative rocks are composed of plagioclase and calcic clinopyroxene （Cpx）, which yield unusually high CaO （〉19 wt.%） in whole-rock chemistry. Petrographical and geochemical data suggest that Pasveh gabbros can be divided into two groups： free scapolite and scapolite-bearing gabbros. The second group has higher Na20, K20, and P205 relative to free scapolite ones and is enriched in LIL （large ion lithophile） and HFS （high field strength） elements. Two stages of metasomatism affected the primary composition of mafic rocks. Firstly, high temperature reaction caused to invert primary high Ti clinopyroxene to low Ti cUnopyroxene＋high Ti amphibole. This reaction was extensive and included all gabbroic samples. Hydrothermal fluids involved in this process can be derived from dehydration reactions of country rocks or from other magmas incorporated in the formation of Pasveh complex pluton. The second metasomatic stage relates to scapolitization of limited parts of gabbroic rocks. An external saline fluid, which is composed of major NaCI and minor KCI and P205 components, impacted locally on Pasveh gabbros and formed the second metasomatic stage. Possible sources of Na and Cl are primary evaporites or brines, which were present in the host sediments of the gabbros. The carbonate-free nature of these hydrothermal fluids suggests that hydrothermal fluids responsible for the formation of scapolite in Pasveh gabbros are derived from marine evaporitic parentage.

关键词： Iran Sanandaj-Sirjan Zone Pasveh pluton gabbro metasomatism high Ti Cpx low Ti Cpx amphibole scapolite.

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Heterogeneity of Mantle Peridotites from the Polar Urals (Russia): Evidence from New LA-ICP-MS Data

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Journal of Earth Science 2019年第3期30卷 431-450页

作者： Vladimir R.Shmelev Shoji Arai Akihiro Tamura Institute of Geology and Geochemistry Ural Branch Russian Academy of Sciences Yekaterinburg 620075 Russia Earth Science Department Kanazawa University Kanazawa 920-1192 Japan

To discuss the nature of the compositional heterogeneity of the peridotite massifs of the Polar Urals(Russia), the geochemical study by LA-ICP-MS of pyroxenes and amphiboles from these mantle formations was performed. The trace element compositions in clinopyroxenes indicate the existence of the mantle protolith of two types. The first protolith type, represented by lherzolites and diopside harzburgites,was originated from the partial melting(5%–10%) under the spinel facies conditions, while the second one,represented by diopside harzburgites, was formed under the polybaric partial melting(17%–19%) under garnet and spinel facies conditions. Subsequently, the mantle peridotite protolith was subject to fluidinduced partial melting in the suprasubduction setting that was resulted in the formation of harzburgites.Being affected by penetrating melts and fluids peridotites experienced the refertilization(LREE enrichment of clinopyroxenes) and high-temperature hydratation with subsequent development of pargasite and Mg amphibole. The high-T fluid-induced metamorphism at the subduction zone was accompanied by the formation of metaperidotites with clinochlore and REE-depleted tremolite.

关键词： pyroxene amphibole peridotite LA-ICP-MS Polar Urals Russia

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