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mineral chemistry of Biotite and Its Petrogenesis Implications in ca.2.5 Ga Wangjiazhuang Granitic Pluton,North China Craton

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Journal of Earth Science 2022年第6期33卷 1535-1548页

作者： Junpeng Wang Kang Jiang Deng Xiao Fenfang Li Fupeng Li Xiaofeng Li Song Jin Guanghuo Tao School of Earth Sciences Center for Global TectonicsChina University of GeosciencesWuhan430074China State Key Laboratory of Geological Processes and mineral Resources China University of GeosciencesWuhan430078China Hebei Institute of Geological Survey Shijiazhuang050081China

The Wangjiazhuang granitic pluton is located in the central Zanhuang Domain,the central part of the North China Craton,which is mainly composed of biotite monzogranite with few mafic microgranular *** is an important ferromagnesian mineral in most of the intermediatefelsic igneous rocks,and its mineral chemistry can record the properties of magma and the petrogenetic physicochemical *** this study,we carried out a detailed petrographic study by electric probe microanalysis on biotite for the biotite monzogranite and mafic microgranular enclaves,to discuss the source,physicochemical conditions,and the magma mingling/mixing processes of the Wangjiazhuang *** results show significantly different chemical compositions from the biotite monzogranite and mafic microgranular *** crystallization of these biotite grains from the biotite monzogranite and mafic microgranular enclaves all occurred in low oxygen *** biotite grains in biotite monzogranite are rich in Fe,poor in Mg,which belong to *** ratios of[(Fe^(3+)+Fe^(2+))/(Fe^(3+)+Fe^(2+)+Mg2+)]are between 0.78 and *** average of FeOT(total FeO)/MgO of biotite grains in biotite monzogranite is *** MF values[2×Mg/(Fe^(2+)+Mg+Mn)]of biotite monzogranite are between 0.31 and 0.47,suggesting biotite monzogranite derived from crustal source rocks(metasedimentary rocks).The formation of granitic rocks including the Wangjiazhuang granite was related to the subduction event at ca.2.5 Ga which resulted in the melting event,and then induced the early partial melting of TTGs and metasedimentary *** biotite in mafic microgranular enclaves varies from siderophyllite to ferrobiotite,and MF values range from 0.63 to 1.06,suggesting that magma of mafic microgranular enclaves had experienced magma mixing/mingling in various *** monzogranite and parts of mafic microgranular enclaves have a similar crystallized condition,while other mafic microgranular

关键词： biotite mineral chemistry crystallization magma mixing Wangjiazhuang granite Zanhuang Massif North China Craton

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Geodynamic significance and genesis of chromitites from the Islahiye ophiolite(Gaziantep,SE Anatolia)as constrained by platinum group element(PGE)compositions and mineral chemistry characteristics

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Acta Geochimica 2022年第5期41卷 741-752页

作者： Nil Yapici Gael Calo sinda Ngbangandimbo Nusret Nurlu Department of Mining Engineering University ofÇukurovaAdanaTurkey Department of Geological Engineering University ofÇukurovaAdanaTurkey Mühendislik Fakültesi Jeoloji Mühendisliği BölümüÇukurovaÜniversitesi01330 BalcalıAdanaTurkey

Chromitites associated with intensely altered dunites and harzburgites from fourteen dif ferent localities in the Islahiye ophiolites(SE Anatolia)is reported here for the first *** chromitites were observed as lenticular and banded bodies with disseminated and massive textures and containing magnesiochromite grains with the following composition:CrO=58.91–59.74 wt%,Al_(2)O_(3)=10.85–11.20 wt%,and TiO=0.09–0.13 wt%.The Mg#[Mg/(Mg+Fe)]values of magnesiochromite from the Islahiye ophiolite range between 0.52 and 0.60 and their Cr#[Cr/(Cr+Al)]values vary from 0.7802 to *** contents vary with a constant pattern,coincident with the estimated parental liquids that have originated from the derivative of a single bulk of boninitic magma together with Al,Ti-poor,and Cr-rich initial *** chromitites are serpentinised in almost all parts of the study area,and harzburgite and dunite can be observed in different *** the overall composition of platinum group elements(PGE)in most examined chromitites varies between 97 and 191 ppb,three chromitites from the Islahiye region present enrichments in overall PGE(up to 214 ppb).The mineralogical and geochemical features of chromitites from the Islahiye region exhibit a robust similarity to podiform chromitites in the mantle fragment of supra–subduction zone type ophiolitic *** estimated parental magmas of the investigated chromites are consistent with the diff erentiation of arcrelated melts and do not suggest an oceanic spreading centre tectonic *** Islahiye chromites are enriched in IPGE(Ir,Os,Ru),with the occasional presence of Ru and Ir and higher Os contents in ***,we did not find any platinum group minerals(PGM)associated with the serpentine silicate sample matrix,which would have stated a secondary enrichment in *** chromitites in the investigated region have high Cr and low Ti values,are defined as magnesiochromite and were crystallised from a characte

关键词： Chromite Platinum group element Platinum group mineral Ophiolite mineral chemistry

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Petrographical and mineral chemistry evidence to delineate the source/sources of the Central Indian Ocean Basin pumices

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Acta Oceanologica Sinica 2023年第5期42卷 102-116页

作者： Niyati G.Kalangutkar Sridhar D.Iyer School of Earth Ocean and Atmospheric SciencesGoa UniversityTaleigao PlateauGoa 403206India Formerly with CSIR-National Institute of Oceanography Dona PaulaGoa 403004India

We present data pertaining to mineral assemblages and composition of the Central Indian Ocean Basin(CIOB)*** groups of pumices were identified considering the presence of phenocrysts of plagioclase,clinopyroxene,orthopyroxene,hornblende and biotite together with the occurrence of quartz and ***,fayalite and ulvospinelare reported for the first time from these *** the eight groups,the modal percentage of the constituents are phenocrysts 3%to 19%(avg 9.6%),silicic glass 33%to 54%(avg 43%)and the rest is *** on the above factors we have identified the possible sources of the CIOB *** mineral compositions of plagioclase,pyroxenes,and biotite of the CIOB pumices were compared with those of Krakatau and *** of the plagioclase and pyroxene compositions resemble the Haranggoal Dacite Tuff of Toba and *** the mineral assemblages and compositions,there are pumices which do not correlate to any of the above eruptions and are probably from yet unidentified source/*** sources could either be from nearby terrestrial volcanoes or intraplate seamounts present in the *** a global context,it is viable that petrological characteristics could be used as initial criteria to determine the source of pumices that occur at abyssal depths in the world ocean.

关键词： CIOB pumice petrography mineral chemistry Indonesian Arc intraplate volcanism

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mineral chemistry, Geobarometry and Oxygen Fugacity of the Granitic Rocks from the Itremo Domain, Central Madagascar

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Journal of Geoscience and Environment Protection 2022年第4期10卷 145-166页

作者： Désiré Alphonse Rakotondravaly Roger Randrianja Directorate of Operations Monitoring Ministry of Mines and Strategic Resources Antananarivo Madagascar Doctoral School of Engineering and Geosciences University of Antananarivo Antananarivo Madagascar

Major and accessory minerals from the Ibity granite, Tsarasaotra monzonitic and granite dykes, and Antsahakely granite of the Itremo domain in the Precambrian basement of Madagascar were characterized by using microscopic observations and chemical analyses with the aim of understanding their chemical characteristics and estimating the crystallization pressure and oxygen fugacity of their host rocks. Plagioclases in these rocks are albite and oligoclase, while alkali feldspars are orthoclase. For the phlogopite-micas, Fe-biotite and Li-phengite are common for the Ibity and Antsahakely granites, Mg-biotite is common for the Ibity granite and the Tsarasaotra monzonitic and granite dykes, and siderophyllite and Zinnwaldite are specific to the Ibity granite. Phlogopite-micas in the studied rocks are mainly primary, accessorily re-equilibrated, and rarely secondary. Calcic amphiboles distributed in the Magnesio-and Ferro-hornblende are identified in the Tsarasaotra monzonitic, whereas amphibole is rare and absent in the other rocks. Igneous titanite is observed in the Ibity granite and in the Tsarasaotra monzonitic rocks, which have similar compositions to some REE oxide-rich titanites. Concerning the Fe-Ti oxide phases, the rhombohedral and spinel/trifer tetroxide phases are found in both the Tsarasaotra monzonitic and the Tsarasaotra granite dyke, the trifer tetroxide and spinel + wüstite phases are found only in the Ibity granite, and the pseudobrookite + rhombohedral phase is found only in the Tsarasaotra granite dyke. The epidote mineral, rarely found in the Antsahakely granite, could be an indicator of metamorphism or hydrothermal activity involved during the emplacement of this rock. Aluminum in hornblende geobarometer gave pressure ranges of around 5 kbar for the Tsarasaotra monzonitic rocks. The Titanite geobarometer gave pressures of 2.5 - 3.2 kbar for the Ibity granite, 2.9 kbar for the Tsarasaotra monzonitic, and 7.1 kbar for the Antsahakely granite. Both amph

关键词： Itremo Granitic Monzonitic mineral chemistry Geobarometer Fugacity

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Geology and mineral chemistry of Gold mineralization in Mirge-Naqshineh Occurrence(Saqez,NW Iran):Implications for Transportation and Precipitation of Gold

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Acta Geologica Sinica(English Edition) 2018年第1期92卷 210-224页

作者： Golale ASGHARI Samad ALIPOUR Hossein AZIZI Hassan MIRNEJAD Department of Geology Urmia University Mining Department Faculty of Engineering University of Kurdistan Department of Geology Faculty of Science University of Tehran

The Mirge-Naqshineh gold district is situated at northwest of Iran with a NW-trending brittle- ductile shear zone. It is hosted by Precambrian meta-sedimentary and meta-volcanic units traversed by mineralized quartz veins. In terms of cross-cutting relationships and sulfide content three types of quartz veins are identified in the region. Among those, parallel to bedding quartz vein （type I） is the main host for gold mineralization. Gold is found in three different forms： 1） submicrometer-size inclusions of gold in arsenian pyrite, 2） as electrum and 3） in the crystal lattice of sulfides （pyrite, galena and chalcopyrite）. Six types of pyrite （Pyl-Py6） were identified in this ore reserve. Py3 coexists with arsenopyrite and contains the greatest As-Au concentrations. There is a negative correlation between the As and S contents in Py2 and Py3, implying the substitution of sulfur by arsenic. Pyrites and mineralized quartz veins were formed via metamorphic-hydrothermal fluid and reflect the gold-transportation as Au（HS）2 under reducing and acidic conditions. The gold precipitation mainly controlled by crystallization of arsenian pyrite during fluid/rock interactions and variation offO2. The volcanic host rock has played an important role in gold concentration, as Py3 in this rock contains inclusion of gold particles, but gold is within the lattice of pyrite in phyllite or other units.

关键词： gold quartz veins mineral chemistry EPMA Mirge-Naqshineh Iran

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Advances in Research of mineral chemistry of Magmatic and Hydrothermal Biotites

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1947-1966页

作者： TANG Pan CHEN Yuchuan TANG Juxing WANG Ying ZHENG Wenbao LENG Qiufeng LIN Bin WU Chunneng Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China Institute of mineral Resources Chinese Academy of Geological Sciences(CAGS)Beijing 100037China China University of Geosciences Beijing 100083China Guangxi Nonferrous Metal Group Resource Exploration Co. Ltd.Nanning 530023China College of Earth Sciences Chengdu University of TechnologyChengdu 610059China

Biotite is an important hydrated ferromagnesian silicate mineral in igneous rocks and porphyry *** determination of chemical compositions of biotite plays an important role in both igneous petrology and ore forming *** paper summarizes research results of magmatic and hydrothermal biotites exemplified by the Lakange porphyry Cu–Mo deposit and the Qulong porphyry Cu deposit in the Gangdese porphyry–skarn metallogenic belt,*** mineral chemistry can provide critical insights into classification,geothermometer,geothermobarometry,oxygen fugacity,petrogenesis and tectonic setting,evaluating magmatic-hydrothermal process by halogen and halogen fugacity ratios,and distinguishing between barren and mineralized *** provides the latest mineralogical evidence on metallogenic prognosis and prospecting evaluation for porphyry Cu polymetallic deposits or magmatic hydrothermal deposits.

关键词： magmatic biotites hydrothermal biotites mineral chemistry porphyry deposit Lakange Qulong Gangdese

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Evolution of Mount Cameroon volcanism: Geochemistry, mineral chemistry and radiogenic isotopes(Pb, Sr, Nd)

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Geoscience Frontiers 2020年第6期11卷 2157-2168页

作者： Emmanuel Wenjeh Wembenyui Kenneth D.Collerson Jian-xin Zhao School of Earth and Environmental Sciences The University of QueenslandSt.Lucia CampusQLD4072BrisbaneAustralia Institute for Geological and Mining Research(IRGM)//Hydrological Research Centre Cameroon Ministry of Scientific Research and InnovationNkolbissonYaoundeCameroon

Mount Cameroon volcano has erupted several times in the 20 th Century with documented eruptions in 1909,1922,1954,1959,1982,1999 and *** of historic volcanism is represented by several older lava flows and lahar deposits around the flanks of the *** study aims to assess the evolution of Mount Cameroon volcanism through its eruptive history via interpretation of mineralogical,whole rock geochemical and Pb,Sr,Nd isotope data generated from historic and recent lava *** this study,samples were collected from the 1959,1982,1999 and 2000 eruptions and from several historic eruption sites with unknown eruption *** of major and trace element data demonstrates that Mount Cameroon is geotectonically associated with within-plate Ocean Island Basalt *** than 90%of the studied historic lavas(n=29)classify as tephrites and basanites whereas the modern lavas(n=38)are predominantly trachybasalts,demonstrating evolution from primitive to evolved lavas over time typically in response to fractional ***,the lavas are porphyritic with main mineral phases being olivine,clinopyroxene,plagioclase feldspars and Fe-Ti-Cr *** 1982 lavas are predominantly aphyric and dominated by lath-shaped flow-aligned plagioclase in the *** chemistry shows variable forsterite compositions from *** vary from diopside through augite to titanaugite with chemical composition ranges from Wo45En32Fs7 to *** feldspars vary from labradorite(An567 O)to bytownite(An80-87).For the Fe-Ti-Cr oxides,calculated ulvospinel component shows a wide variation from ***-normative classification on the Di-Ol-Hy-Qz-Ne system shows that all Mount Cameroon lavas are nepheline-normative(Ne ranges from4.20 wt.%to 11.45 wt.%).Radiogenic isotope data demonstrate that Mount Cameroon lavas are HIMU(or high μ=238U/204Pb),characterized by 206Pb/204Pb=20.19-20.46,207Pb/204Pb=15.63-15.69,208Pb/204

关键词： Mount Cameroon HIMU Petrogenesis Geochemical evolution Radiogenic isotopes mineral chemistry

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Glass and mineral chemistry of Northern Central Indian Ridge Basalts:Compositional Diversity and Petrogenetic Significance

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Acta Geologica Sinica(English Edition) 2009年第6期83卷 1122-1135页

作者： Dwijesh RAY Ranadip BANERJEE Sridhar D IYER Basavaraju BASAVALINGU Subir MUKHOPADHYAY4 National Centre for Antarctic and Ocean Research National Institute of Oceanography CSIR Department of Studies in Geology University of Mysore Department of Geological Sciences Jadavpur University

The glass and mineral chemistry of basaits examined from the northern central Indian ridge （NCIR） provides an insight into magma genesis around the vicinity of two transform faults： Vityaz （VT） and Vema （VM）. The studied mid-ocean ridge basalts （MORBs） from the outer ridge flank （VT area） and a near-ridge seamount （VM area） reveal that they are moderately phyric plagioclase basalts composed of plagioclase （phenocryst [An60-90] and groundmass [An35-79]）, olivine （Fo81-88）, diopside （Wo45-51, En25-37, Fs14-24）, and titanomagnetite （FeOt -63.75 wt% and TiO2 -22.69 wt%）. The wholerock composition of these basalts has similar Mg# [mole Mg/mole（Mg＋Fe2＋）] （VT basalt： -0.56-0.58; VM basalt： -0.57）, but differ in their total alkali content （VT basalt： -2.65; VM basalt： -3.24）. The bulk composition of the magma was gradually depleted in MgO and enriched in FeOt, TiO2, P2O5, and Na2O with progressive fractionation, the basalts were gradually enriched in Y and Zr and depleted in Ni and Cr. In addition, the ∑REE of magma also increased with fractionation, without any change in the （La/ Yb）N value. Glass from the VM seamount shows more fractionated characters （Mg#： 0.56-0.57） compared to the outer ridge flank lava of the VT area （Mg#： 0.63-0.65）. This study concludes that present basalts experienced low-pressure crystallization at a relatively shallow depth. The geochemical changes in the NCIR magmas resulted from fractional crystallization at a shallow depth. As a consequence, spinel was the first mineral to crystallize at a pressure 〉10 kbar, followed by Fe-rich olivine at 〈10 kbar pressure.

关键词： mineral chemistry fractional crystallization petrogenesis northern central Indian ridge

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mineral chemistry of Wehrlite Xenoliths Hosted in Basalts from the SW of Hossere Dammougalre(Adamawa Plateau,Cameroon):Thermobarometric Implications

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Open Journal of Geology 2017年第10期7卷 1465-1477页

作者： Isaac Bertrand Gbambie Mbowou Dagwai Nguihdama Fadimatou Ngounouno Yamgouot Mama Ntoumbe Abdel Aziz Youpoungam Ismaila Ngounouno School of Geology and Mining Engineering University of NgaoundereNgaoundereCameroon Department of Life and Earth Sciences Higher Teachers’Training CollegeUniversity of MarouaMarouaCameroun Department of Earth Sciences Faculty of ScienceUniversity of NgaoundereNgaoundereCameroon

Wehrlite samples (size: ~4 cm) hosted in basaltic lavas from the SW of Hosséré Dammougalré are located in the western Adamawa Plateau. Porphyritic and allotriomorphic texture characterize respectively host Basalt and wehrlite xenoliths. The phenocrysts of olivine (Fo68−74), and Ti-magnetite are scattered in host basalt. Wehrlite xenoliths (~4 cm size) contain Cr-rich clinopyroxene (diopise-augite), olivine (Fo76−88) and chromiferous spinel. Equilibrium temperatures calculated from Fe/Mg exchange reaction for olivine/spinel vary between 944°C and 1102°C. The wehrlite olivine crystals with low Fo (<90) indicate a re-equilibration of Fe-Mg in the host basalt at low temperatures. All the analyzed wehrlite clinopyroxenes have crystallized at high pressures as evidenced by the Alvi and Aliv contents. The studied spinel-bearing wehrlite xenoliths represent probably the residual portions of the upper mantle, which are an important source of information about lithospheric composition and thermal evolution beneath the Adamawa Plateau.

关键词： Wehrlite Adamawa Plateau Hossere Dammougalré mineral chemistry Geothermometry

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Geochemistry, mineral chemistry and Thermobarometry of Boneh-Shorou Amphibolites in Gelmandeh Massive (Saghand-Central Iran)

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Open Journal of Geology 2016年第8期6卷 786-800页

作者： Arash Gourabjeiri-Pour Soraya Heuss-Aßbichler Mohsen Mobasheri Parivash Mahdavi Department of Geology Faculty of Science Miyane Branch Islamic Azad University Miyane Iran Department of Earth and Environmental Sciences Section for Mineralogy Petrology and Geochemistry Ludwig-Maximilians University Muenchen Germany Department of Petrology and Economic Geology School of Geosciences Shahrood University of Technology Shahrood Iran Department of Geology Faculty of Science Science and Research Branch Islamic Azad University Tehran Iran

The Gelmandeh Massive is located in the Central part of Iranian Microcontinent. Amphibolitic rocks occupy the main portion of Gelmandeh complex, which consists of hornblendite, garnet amphibolites, and gneiss. Geochemical investigations indicate that the ratio of Eu/Eu* separates samples into two categories: first category with ratio of Eu/Eu* > 1 and the second with ratio of Eu/Eu* mineral paragenesis show that the metamorphism is of Barovian type with PT condition upto 7 K bar and 580°C.

关键词： Amphibolite mineral chemistry Thermobarometry Gelmandeh Massive Boneh-Shorou Central Iran

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