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Zircon U-Pb dating of basement gneisses in the super-large Bayan Obo REE-Fe-Nb deposit, Inner Mongolia

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Chinese Science Bulletin 2002年第3期47卷 243-247页

作者： WANG Kaiyi fan hongrui XIE Yihan LI Huimin LTE Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Tianjin Institute of Geology and Mineral Resources Chinese Academy of Geological SciencesTianjin 300170China

Zircon U-Pb ages have been determined for basement gneisses in the Bayan Obo REE-Fe-Nb deposit. On the U-Pb concordia diagram data of three samples yield up-per intercept ages of 1948-1917 Ma. Thus, these basement gneisses are of Paleoproterozoic. Rock association of these basement gneisses includes tonalite, syenite and paragneiss, not belonging to a sedimentary package. It is more appro-priate to consider this association as a basement complex rather than a stratigraphic 'Group'.

关键词： basement complex zircon U-Pb age Bayan Obo.

In situ Nd isotopic measurement of natural geological materials by LA-MC-ICPMS

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Chinese Science Bulletin 2008年第7期53卷 1062-1070页

作者： YANG YueHeng SUN JinFeng XIE LieWen fan hongrui WU FuYuan State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

Using newly determined Sm isotopic abundances for correcting the isobaric interference of 144Sm on 144Nd and the established mass bias relationship between Sm and Nd, a series of in situ Nd isotopic measurements were conducted for relatively high Nd concentrations of natural geological materials, including apatite, titanite, monazite and perovskite on a Neptune multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS), coupled to a 193 nm ArF excimer laser ablation system. The results show that Ce has no significant influence on the precision and accuracy of Nd isotopic analyses for LREE-enriched geological minerals and that our approach is efficient in obtaining reliable 143Nd/144Nd and 147Sm/144Nd ratios for those materials with Sm/Nd<1 (147Sm/144Nd<0.6). When combined with trace element and U-Pb isotope data, the in situ Nd isotopic data can provide important information on geological processes.

关键词：钕同位元素测量方法地质材料

Bayan Obo Carbonatites:Texture Evidence from Polyphase Intrusive and Extrusive Carbonatites

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Acta Geologica Sinica(English Edition) 2010年第6期84卷 1365-1376页

作者： WANG Kaiyi fan hongrui YANG Kuifeng HU fangfang MA Yuguang Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029

Most of the so-called Bayan Obo fine-grained dolomite marbles collected from the main and east orebodies show a microporphyritic texture,namely the microphenocrysts are set in a very finegrained matrix,although nearly all of them have undergone recrystallization caused either by deformation or *** texture seems likely to have maintained the original *** is known that one of the most characteristic textures of volcanic rocks is the porphyritic texture,and the microporphyritic texture is a variety in which both the phenocrysts and the matrix are only distinguishable with the ***,the dolomite marbles in the main and east orebodies may be related to the extrusive *** addition,there also occur some carbonatite sills and dykes with different textures at Bayan ***,the Bayan Obo carbonatites are polyphase intrusive and extrusive carbonatites.

关键词： extrusive carbonatite microporphyritic texture Bayan Obo

Fluid inclusions in whiteschist in the ultrahigh-pressure metamorphic belt of Dabie Shan,China

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Chinese Science Bulletin 2002年第12期47卷 1028-1032页

作者： hongrui fan Jingbo Liu Jinghui Guo Kai Ye Bolin Cong Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China

Hualiangting whiteschist in the Dabie Shan ultrahigh-pressure eclogite complex is a specific Mg-Al-rich metamorphic rock. Its protolith was a felsic dyke, which suffered replacement by high-pressure fluids during ec-logite-facies metamorphism. Based on fluid inclusion results in whiteschist, primary high-pressure fluids are CO2-bearing aqueous solutions. Those prove that there exists CO2-H2O fluid during the ultrahigh-pressure metamorphism. Pseu-dosecondary H2O inclusions were trapped during ultra-high-pressure exhumation, whereas secondary H2O inclusions were related to the latest evolutionary stage of the ultrahigh-pressure exhumation.

关键词： fluid inclusion whiteschist ultrahigh-pressure Dabie Shan.

Fluid Inclusion and Carbon-Oxygen Isotope Studies of the Hujiayu Cu Deposit,Zhongtiao Mountains,China:Implications for Synmetamorphic Copper Remobilization

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Acta Geologica Sinica(English Edition) 2015年第3期89卷 726-745页

作者： QIU Zhengjie fan hongrui LIU Xuan WEN Bojie HU fangfang YANG Kuifeng GUO Shuanglong ZHAO Fengchun Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences Zhongtiaoshan Non-ferrous Metals Group Co. Ltd

The Hujiayu Cu deposit,representative of the ＂HuBi-type＂ Cu deposits in the Zhongtiao Mountains district in the southern edge of the North China Craton,is primarily hosted in graphitebearing schists and carbonate *** ore minerals comprise mainly chalcopyrite,with minor sphalerite,siegenite[（Co,Ni）_3S_4],and clausthalite[Pb（S,Se）].The gangue minerals are mainly quartz and dolomite,with minor *** fluid inclusion types were recognized in the chalcopyrite-pyrite-dolomite-quartz veins,including CO_2-rich inclusions（type Ⅰ）,low-salinity,liquid-dominated,biphase aqueous inclusions（type Ⅱ）,solid-bearing aqueous inclusions（type Ⅲ）,and solid-bearing aqueous-carbonic inclusions（type Ⅳ）.Type I inclusion can be further divided into two sub-types,i.e.,monophase CO_2 inclusions（type Ⅰa） and biphase CO_2-rich inclusions（with a visible aqueous phase）,and type Ⅲ inclusion is divided into a subtype with a halite daughter mineral（type Ⅲa） and a subtype with multiple solids（type Ⅲb）.Various fluid inclusion assemblages（FIAs） were identified through petrographic observations,and were classified into four *** group-1 FIA,consisting of monophase CO_2 inclusions（type Ⅰa）,homogenized into the liquid phase in a large range of temperatures from-1 to 28℃,suggesting post-entrapment *** group-2 FIA consists of type Ⅰb,Ⅲb and Ⅳ inclusions,and is interpreted to reflect fluid *** group-3 FIA comprises type Ⅱ and Ⅲa inclusions,and the group-4FIA consists of type Ⅱ inclusions with consistent phase *** group-1 and group-2 FIAs are interpreted to be entrapped during mineralization,whereas group-3 and group-4 FIAs probably represent the post-mineralization *** solid CO_2 melting temperatures range from-60.6 to56.6℃ and from-66.0 to-63.4℃ for type Ⅰa and type Ⅳ inclusions,*** homogenization temperatures for type Ⅱ inclusions range from 132 to 170℃ for group-3 FIAs and115 to 219℃ for group-4 *** halite melting temperatures range

关键词： Fluid inclusion assemblage carbon-oxygen isotope syn-metamorphic Cu deposit,Hujiayu Cu deposit Zhongtiao Mountains

Conditions and processes leading to large-scale gold deposition in the Jiaodong province,eastern China

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Science China Earth Sciences 2021年第9期64卷 1504-1523页

作者： hongrui fan Tingguang LAN Xinghui LI M.SANTOSH Kuifeng YANG fangfang HU Kai FENG Huanlong HU Hongwei PENG Yongwen ZHANG Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing100029China State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang550081China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences BeijingBeijing100083China State Key Laboratory of Mineral Processing BGRIMM Technology GroupBeijing102628China School of Geosciences and Info-physics Central South UniversityChangsha410012China

The gold deposits in the Jiaodong Peninsula constitute the largest gold mineralized province in *** mineralization shows common characteristics in their tectonic setting,ore-forming fluid and metallogenic *** and fluid immiscibility are two important mechanisms controlling gold precipitation,both of which consume sulfur in the oreforming *** escape of H2S from the main ore-forming fluids and the decrease of total sulfur concentration not only lead to the efficient precipitation of gold,but also result in the crystallization of reducing minerals such as pyrrhotite and oxidizing minerals such as *** solubility shows strong dependence on temperature,pressure,and CO2 *** dependence of quartz solubility on pressure is weak at low temperatures,and progressively stronger at higher ***,the temperature dependence of quartz solubility is relatively low at low pressures,but becomes gradually stronger at high *** results of solubility modeling can constrain the dissolution and reprecipitation behavior of quartz in the oreforming veins and the formation mechanism of different types of quartz *** multi-stage mineralization fluid activity resulted in the complex dissolution structure of quartz in the Jiaodong gold *** in the main metallogenic period in the Jiaodong gold deposits shows complex microstructure characteristics at single crystal *** trace elements(mainly the coupling of As-and Au-rich belt)and sulfur isotope composition also display a certain *** As-rich fluids might have formed by the initial pulse of ore-forming fluids through As-rich metasedimentary strata,while the As-Au oscillation zone at the margin of pyrite grains is related to the pressure fluctuation caused by fault activity and the local phase separation of *** is a temporal and spatial evolution of gold fineness in the Jiaodong gold ***/rock reaction(sulfidation)was the main ore-

关键词： Mineral precipitation Mineral assemblage Gold fineness Ore-forming condition and processes Gold deposit Jiaodong

Comparison of two end-member styles of epithermal Au-(Cu)deposits

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Chinese Science Bulletin 1999年第S2期44卷 212-213页

作者： fan hongrui and XIE Yihan Institute of Geology, Chinese Academy of Sciences, Beijing 100029, China Institute of Geology Chinese Academy of Sciences Beijing 100029 China

EPITHERMA Au-(Cu) deposits occur largely in volcano-plutonic arcs (island arcs as well as continentalarcs) associated with subduction zones, with ages similar to those of volcanism. These deposits form atshallow depth,<1 km, and are hosted mainly by volcanic rocks. Modern volcanic-hydrothermal systems provide an analogue to the environment for the ancient intrusion-related and volcanic epithermal deposits. Recent studies also indicate that the volcanic epithennalore deposits are formed from magmatic fluids, although the magmatic signatures have been largely erasedby meteoric water. At depth (fig. 1), the magmatic fluid from the high-level intrusive magma will result in the formation of intrusion-related deposits (e.g. porphyry Cu, Au, Mo deposits). Detailed studies of fluid inclusions and stable isotopes indicate that the hydrothermal system that form these deposits are initially

关键词： epithermal Au(Cu) deposit mineralization ore-forming fluid.

Decratonic gold deposits

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Science China Earth Sciences 2015年第8期58卷 1523-1537页

作者： ZHU RiXiang fan hongrui LI JianWei MENG QingRen LI ShengRong ZENG QingDong State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences

The North China Craton(NCC) hosts numerous gold deposits and is known as the most gold-productive region of China. The gold deposits were mostly formed within a few million years in the Early Cretaceous(130–120 Ma), coeval with widespread occurrences of bimodal magmatism, rift basins and metamorphic core complexes that marked the peak of lithospheric thinning and destruction of the NCC. Stable isotope data and geological evidence indicate that ore-forming fluids and other components were largely exsolved from cooling magma and/or derived from mantle degassing during the period of lithospheric extension. Gold mineralization in the NCC contrasts strikingly with that of other cratons where gold ore-forming fluids were sourced mostly from metamorphic devolatization in compressional or transpressional regimes. In this paper, we present a summary and discussion on time-space distribution and ore genesis of gold deposits in the NCC in the context of the timing, spatial variation, and decratonic processes. Compared with orogenic gold deposits in other cratonic blocks, the Early Cretaceous gold deposits in the NCC are quite distinct in that they were deposited from magma-derived fluids under extensional settings and associated closely with destruction of cratonic lithosphere. We argue that Early Cretaceous gold deposits in the NCC cannot be classified as orogenic gold deposits as previously suggested, rather, they are a new type of gold deposits, termed as "decratonic gold deposits" in this study. The westward subduction of the paleo-West Pacific plate(the Izanagi plate) beneath the eastern China continent gave rise to an optimal tectonic setting for large-scale gold mineralization in the Early Cretaceous. Dehydration of the subducted and stagnant slab in the mantle transition zone led to continuous hydration and considerable metasomatism of the mantle wedge beneath the NCC. As a consequence, the refractory mantle became oxidized and highly enriched in large ion lithophile e

关键词： Early Cretaceous craton destruction decratonic gold deposit ore deposit model

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PORPHYRY-TYPE MOLYBDENUM DEPOSITS IN THE EASTERN QINLING MO BELT, CENTRAL CHINA

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Scientia Geologica Sinica 1999年第1期 91-101页

作者： fan hongrui Xie Yihan (Institute of Geology Chinese Academy of Sciences. Beijing 100029)

The Eastern Qinling mineralizing belt of porphyry-type Mo deposits is located in the south margin of North China Platform. About 40% explored Mo resources of China are stored in that belt. Mo mineralization is related with Yanshanian （161-104Ma） small intermediate to acidic porphyry bodies. As the porphyry bodies intruded into Archean to middle Proterozoic carbonate rocks and alumino-silicate rocks, porphyry-type, sham-type and hornfels-type Mo ores were formed with different types of wallrock alteration. Ore-forming fluids are characterized by H2O-CO2-NaCl with lower to middle saline （0-l2.7% NaCl）. Oxygen and hydrogen isotope data suggest that ore-forming fluid of the early stage is mainly magmatic water. Along with evolution of mineralization to late stage, ratio of magmatic water decreased and meteoric water added.

关键词： CO CENTRAL CHINA PORPHYRY-TYPE MOLYBDENUM DEPOSITS IN THE EASTERN QINLING MO BELT Ca Li Ph