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Petrogenesis and Metallogenesis of the Mazaertag layered intrusion in the Tarim Large Igneous Province,NW China

Acta Geologica Sinica(English Edition) 2017年第5期91卷 1653-1679页

作者： CAO Jun WANG Qimeng Fundamental Science on Radioactive Geology and Exploration Technology Laboratory East China University of Technology Nanchang 330013 Jiangxi China School of Earth Sciences East China University of Technology Nanchang 330013 Jiangxi China NO.1 Institute of Geology and Mineral Resources Survey of Henan Luoyang 471023 Henan China

The Mazaertag layered intrusion is located in the northwestern part of the Tarim large igneous province where several early Permian layered mafic-ultramafic intrusions host important Fe-Ti oxide deposits. The intrusion covers an area of -0.13 km-2 and has a vertical stratigraphic thickness of at least300 m. It consists chiefly of olivine clinopyroxenite, and is cut through by the nearby mafic-ultramafic dykes. In this paper, we report new mineral chemistry data and whole-rock chemical and isotopic compositions for the Mazaertag intrusion along with whole-rock isotopic compositions for the nearby mafic dykes. The averaged compositions of cumulus olivine, clinopyroxene and intercumulus plagioclase within individual samples range from Fo71-73,Mg^# = 76 to 79 and An65-75 but they do not define sustained reversals. The observed mineral compositions are consistent with the differentiation of a single batch of magma in a closed system. Rocks of the Mazaertag intrusion are characterized by enrichment in light REE relative to heavy REE, positive Nb and Ta anomalies and a small range of age-corrected εNd（t）（-0.1 to ＋0.9） and initial ^87Sr/^86Sr values（0.7044 to 0.7068）. The slightly lower εNdt）, initial ^206Pb/^204Pb and higher initial ^87Sr/^86Sr values of the intrusion compared to those of the least contaminated dykes[εNdt） =＋2.8 to ＋3.4;^206Pb/^204Pb）i = 18.516-18.521;（^87Sr/^86Sr）i = 0.7038-0.7041] imply that the Mazaertag magma was subjected to small to modest degrees of contamination by the upper crust. The Sr-Nd isotopic compositions of the least contaminated dykes are consistent with derivation from a FOZO-like mantle source. The parental magma of the Mazaertag intrusion, estimated from clinopyroxene compositions using mineral-melt partition coefficients, has trace element compositions similar to some of the most primitive mafic dykes in the same area. This suggests that the Mazaertag intrusion and mafic dykes shared a similar mantle source. Therefore, the parental ma

关键词： clinopyroxene Fe-Ti oxide layered intrusion Mazaertag Tarim large igneous province

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The Fanshan Apatite-magnetite Deposit in the Potassic Ultramafic layered intrusion,North China

The Fanshan Apatite-magnetite Deposit in the Potassic Ultram...

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中国科学院地质与地球物理研究所2003学术年会

作者： Chun CHENG~1 and Shihua SUN Key Laboratory of Mineral Resources.Institute of Geology and Geophysics,Chinese Academy of Sciences.Beijing 100029,China 1 With additional post in the Graduate School of the Chinese Academy of Sciences,Beijing 100039,China

This article reviews work carried out on the Fanshan layered apatite(-magnetite) deposit,which occurs in the Fanshan complex,a potassic ultramafic-syenite layered intrusion located in North *** Fanshan complex intruded into Proterozoic sedimentary rocks in the early *** complex comprises First- to Third-Phase *** First-Phase Intrusive includes rhythmic Units 1 to *** mainly consist of clinopyroxenite and biotite *** apatite(-magnetite) deposit is situated near the top of rhythmic Unit no.6 of the First-Phase Intrusive. The economical deposit comprises OrebodyⅡand OrebodyⅢ.OrebodyⅡ.situated at the top of Unit no.6,consists of two kinds of layer:one magnetite-apatite rock layer at the top and a few apatite rock layers at the ***Ⅲis situated several meters below OrebodyⅡ,and consists of an apatite rock layer. There is controversy over the ore formation mechanism,the temperature and pressure of the magma intrusion,and the origin of the magma(including the possibility of magma immiscibility).We review these problems of this unique apatite(-magnetite) magmatic deposit.

关键词： Fanshan apatite-magnetite deposit potassic ultramafic-syenite complex layered intrusion rhythmic unit North China

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Crystallization of Hydrous Ti-Rich Basaltic Magma and Its Implication for the Origin of Fe-Ti Oxide in layered intrusions of the Emeishan Large Igneous Province

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Journal of Earth Science 2022年第2期33卷 507-512页

作者： Junlong Yang Chao Wang Zhenmin Jin State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China

A series of crystallization experiments have been carried out by using natural Emeishan Ti-rich hydrous basalts as starting materials at a pressure of 0.5 GPa and temperatures of 800-1000℃to constrain the origin of Fe-Ti-V oxide ore *** experimental results demonstrate that the sandwich-and trellis-type ilmenite lamellae in titanomagnetite of layered intrusions can be formed by the reaction of earlier crystallized ilmenite and the evolved parental *** evolution of parental basaltic magma,the Fe-Ti oxide should be composed of titanomagnetite+ilmenite in the earlier stage,but changed to titanomagnetite+titanomagnetite-ilmenite intergrowth±ilmenite at the later ***,the Panzhihua Fe-Ti oxide ores,which are mainly composed of titanomagnetite,should be formed earlier than the adjacent gabbro,in which titanomagnetite-ilmenite intergrowth is the major form of the Fe-Ti oxide.

关键词： high pressure and high temperature experiment crystallization Fe-Ti oxide layered intrusion high-Ti basalt petrology

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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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Physicochemical Control of the Early Permian Xiangshan Fe-Ti Oxide Deposit in Eastern Tianshan(Xinjiang),NW China

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Journal of Earth Science 2018年第3期29卷 520-536页

作者： Yu Shi Yuwang Wang Jingbin Wang Lutong Zhao Hongjing Xie Lingli Long Tao Zou Dedong Li Guochao Zhou Beijing Institute of Geology for Mineral Resources Beoing 100012China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming 650093China

The Xiangshan mafic-ultramafic complex is one of the major Early Permian maficultramafic intrusions in eastern Tianshan （Xinjiang, NW China）, and consists of two major intrusive phases. The first intrusive phase is mainly gabbroic rocks hosting ilmenite mineralization, while the second intrusive phase is mainly lherzoilite associated with Ni-Cu sulfide mineralization. The Xiangshan ilmenite orebodies hosted in the Fe-Ti oxide-bearing gabbro occur along the contact between hornblende gabbros and leucogabbros. The hornblende gabbros and Fe-Ti oxide rich gabbros at Xiangshan are newly dated to be Early Permian （280.1 and 279.2 Ma, respectively）. Major and trace element compositions of zircons and whole rocks from Xiangshan hornblende gabbro and Fe-Ti oxide gabbro have been measured by in situ excimer laser ablation ICP-MS. Zircon Ce^4＋/Ce^3＋ ratios based on lattice-strain model and Ti-in-zircon temperatures of hornblende gabbro and Fe-Ti oxide gabbro of the Xiangshan complex are calculated to evaluate the physicochemical variations during the ilmenite mineralization. Whole-rock geochemistry and zircon trace element geochemistry suggest that Fe-Ti oxide gabbros were formed from a basaltic parent magma which had undergone a transfromation from being H2O-rich to H2O-poor. During the magmatic evolution, primitive, HEO-poor basaltic melts may have been replenished into the system, increasing its solidus temperature and decreasing its oxygen fugacity and H2O contents. This may have supperessed the Ti-rich poikilitic hornblende fractionation and promoted the plagioclase fractionation, which consequently concentrated the ore-forming components in the residual melts and generated the ilmenite mineralization.

关键词： eastern Tianshan magmatic Fe-Ti oxide deposits gabbros layered intrusion zircon U-Pb age geochemistry.

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