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Geochronology and geochemistry of the Donglufang porphyry-skarn Mo-Cu deposit in the southern Yidun Terrane and their geological significances

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Geoscience Frontiers 2018年第5期9卷 1433-1450页

作者： Wenyan He Shixiong Xie Xudong Liu Xue Gao Yanlu Xing state key laboratory of geological processes and mineral resources China University of Geosciences school of Earth Atmosphere and Environment Monash University

The newly-discovered Donglufang Moe Cu porphyry-skarn deposit is located in the southern Yidun Terrane, southeast Tibet, with more than 80 million tonnes(Mt) of reserves(grading 0.15 wt.% Mo and0.48 wt.% Cu) hosted in Triassic strata and Late Cretaceous granodiorite porphyry. Ree Os dating of molybdenum ore yielded a weighted mean age of 84.9 ± 1.0 Ma and an isochron age of 85.2 ± 0.6 ***-ICP-MS Ue Pb dating of zircons from the granodiorite porphyry yielded206 Pb/238 U ages ranging from 87.4 Ma to 84.2 Ma with a weighted mean206 Pb/238 U age of 85.1 ±0.5 Ma, indicating a temporal linkage between granitic magmatism and Moe Cu mineralization. Geochemical analyses show that the granodiorite porphyries are I-type granites with Si O_2 contents of 64.3 -66.7 wt.%. These rocks are typically metaluminous with high K_2 O/Na_2 O ratios, low Mg O(1.32 -1.56 wt.%), Cr(5.6 -12.9 ppm), Ni(3.79 -10.81 ppm), Mg#(43 -52) values, and high Sr(304 -844 ppm), Sr/Y(21.2 -50.8) and La/Yb ratios(37.0 -60.1). They are enriched in light rare-earth elements(LREE) relative to heavy rare-earth elements(HREE), with slightly negative Eu anomalies, and are enriched in Th, U and large ion lithophile elements(LILE, e.g., K and Rb), and depleted in high field strength elements(HFSE, e.g., Nb, Ta, P and Ti). They also show negative zircon εHf(t) values(-6.7 to -2.3) and negative whole rock εNd(t) values(à5.2 to-4.3), as well as old Hfe Nd model ages, indicating the magmas were derived from a thickened ancient lower crust within the garneteamphibolite facies. Considering the tectonic evolution of the Yidun Terrane, geochemical characteristics of granodiorite porphyry, and the ages of mineralization obtained in this study. We suggest that the Donglufang deposit was formed in a post-collisional setting, which has a genetic relationship with the emplacement of the granodiorite porphyry. The present study provide key information for the exploration of the Late Cretaceous metallogeny in the Yidun Terrane.

关键词： Late cretaceous Mo-Cu metallogenesis Molybdenite Re-Os geochronology U-Pb zircon dating Yidun terrane

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Diagenetic control of magnetic susceptibility variation in Core MD98-2172 from the Eastern Timor Sea

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Chinese Journal of Oceanology and Limnology 2010年第6期28卷 1350-1361页

作者：李海燕张世红白凌燕方念乔 state key laboratory of geological processes and mineral resources China University of Geosciences school of Marine Science China University of Geosciences

Detailed mineral magnetic measurements, integrated with grain-size distribution and X-ray diffraction （XRD） analyses, were made on the marine sediments of Core MD98-2172, retrieved from the Eastern Timor Sea. Values of magnetic susceptibility in this core drop sharply down-core from -3.85 m deep below sediment/water interface and are very low at -5.35 m. However, both XRD and grain-size distribution results show no sudden change in terrigenous input during sedimentation. mineral magnetic results indicate that the depth of -3.85 m may be an oxic/anoxic boundary. Therefore, the sediments below -3.85 m have been subjected to intense reductive diagenesis, whereas the sediments above -3.85 m are seldom affected. The magnetic properties of the sediments shallower than 3.85 m are dominated by pseudo-single domain （PSD） magnetite, with little down-core variation in its content and grain size. Below -3.85 m, the magnetic mineral assemblages that have survived in the sediments may record different stages of the reductive diagenesis：（1） the sediments from the 3.85-5.35 m interval are at the stage of iron oxide reduction; t＇SD magnetite is the major magnetic contributor, but it becomes less abundant and coarser down-core; （2） the sediments below -5.35 m are at the stage of sulphate reduction; ferrimagnetie minerals almost vanish and paramagnetic minerals contribute to down-core susceptibility variations, including pyrite as evidenced by high-temperature magnetic susceptibility measurements. However, the susceptibility variations below -5.35 m of Core MD98-2172 show obvious periodicity, despite the intense effect of reduetive diagenesis. Furthermore, the down-core susceptibility variations are coincident with fluctuations in the quantity of fine detrital particles （〈8 μm）, which may come mainly from the advection of the Indonesia Throughflow （ITF） and/or river input from Timor. Therefore, for Core MD98-2172, susceptibility variation below -5.35 m, which potentially correspond t

关键词： Eastern Timor Sea susceptibility reductive diagenesis fine detrital particles

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Late Mesozoic Ore-forming Events in the Ningwu Ore District, Middle-Lower Yangtze River Polymetallic Ore Belt, East China: Evidence from Zircon U-Pb Geochronology and Hf Isotopic Compositions of the Granodioritic Stocks

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Acta Geologica Sinica(English Edition) 2012年第3期86卷 719-736页

作者： DUAN Chao LI Yanhe HOU Kejun YUAN Shunda LIU Jialin ZHANG Cheng state key laboratory of geological processes and mineral resources School of the Earth Sciences and Resources China University of Geosciences Beijing 100083 China MLR key laboratory of Metallogeny and mineral Assessment Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China

Late Mesozoic volcanic-subvolcanic rocks and related iron deposits, known as porphyry iron deposits in China, are widespread in the Ningwu ore district （Cretaceous basin） of the middle-lower Yangtze River polymetallic ore belt, East China. Two types of Late Mesozoic magmatic rocks are exposed： one is dioritic rocks closely related to iron mineralization as the hosted rock, and the other one is granodioritic （-granitic） rocks that cut the ore bodies. To understand the age of the iron mineralization and the ore-forming event, detailed zircon U-Pb dating and Hf isotope measurement were performed on granodioritic stocks in the Washan, Gaocun-Nanshan, Dongshan and Heshangqiao iron deposits in the basin. Four emplacement and crystallization （typically for zircons） ages of granodioritic rocks were measured as 126.1±0.5 Ma, 126.8±0.5 Ma, 127.3±0.5 Ma and 126.3±0.4 Ma, respectively in these four deposits, with the LA-MC-ICP-MS zircon U-Pb method. Based on the above results combined with previous dating, it is inferred that the iron deposits in the Ningwu Cretaceous basin occurred in a very short period of 131-127 Ma. In situ zircon Hf compositions of εHf（t） of the granodiorite are mainly from -3 to -8 and their corresponding 176Hf/177Hf ratio are from 0.28245 to 0.28265, indicating similar characteristics of dioritic rocks in the basin. We infer that granodioritic rocks occurring in the Ningwu ore district have an original relationship with dioritic rocks. These new results provide significant evidence for further study of this ore district so as to understand the ore-forming event in the study area.

关键词： Zircon U-Pb age Hf isotope porphyry iron deposit Ningwu ore district Middle–Lower Yangtze River polymetallic ore belt

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Geochronology and Hf Isotope Study of Pegmatite in the Xiaoqinling Area of NW China: Implication for Petrogenesis and Regional Metamorphism

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Journal of Earth Science 2015年第3期26卷 295-305页

作者： Haixiang Zhao Shaoyong Jiang Baozhang Dai Liang Ma Jianwei Li school of Earth Sciences and Engineering Hohai University state key laboratory of geological processes and mineral resources Faculty of Earth ResourcesChina University of GeosciencesWuhan state key laboratory for mineral Deposits research School of Earth Sciences and EngineeringNanjing University

In this study, we carried out petrography, zircon U-Pb geochronology and Hf isotopic analyses on a granitic pegmatite dyke in the Xiaoqinling area in southern margin of the North China Craton（NCC）. Our study suggests that the pegmatite dyke likely crystallized from a volatile-rich pegmatitic magma. Different from most other pegmatite elsewhere, zircon from this pegmatite dyke does not contain unusually high U and Th concentrations and suffered no evident radioactive damage, therefore we successfully obtained a zircon U-Pb dating using laser ablation-inductively coupled plasma-mass spectrometry（LA-ICP-MS）, which yields an average 207Pb/206 Pb age of 1 814±6 Ma, representing the intrusive age of the granitic pegmatite dyke. Zircon εHf（t） values are between-8.3 and-3.0, corresponding to Hf depleted mantle model ages from 2 649 to 2 991 Ma with an average of 2 881 Ma. These data indicate that this granitic pegmatite dyke may have been derived from partial melting of Meso-Neoarchean metamorphic rocks from the Xiaoqinling basement. Granitic pegmatite magma may have emplaced within the Taihua Group wall rocks during the last stage of the middle to high grade metamorphism. Furthermore, according to the petrographic observation, the 1.81 Ga pegmatite dyke and the 1 800–1 750 Ma Xiong’er Group rocks were not undergone middle to high grade metamorphism, indicating 1.81 Ga as the termination of the latest regional metamorphism in the southern margin of the NCC.

关键词： Xiaoqinling pegmatite zircon U-Pb dating Hf isotope metamorphism

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New Discovery of Telluride and Bi?Sulfosalt in the Dahu Quartz Vein?Style Au?Mo Deposit, Xiaoqinling Region,China

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Acta Geologica Sinica(English Edition) 2019年第1期93卷 241-243页

作者： YIN Chao LIU Jiajun ZHAI Degao GUO Yuncheng state key laboratory of geological processes and mineral resources China University of Geosciences school of Earth Sciences and resources China University of Geosciences

The Dahu quartz vein-style Au-Mo deposit is an important deposit in the Xiaoqingling region,which contains a total reserves of 38 tons of Au at an average grade of 6.8 g/t and 100,000 tons of Mo at an average grade of 0.24%.It is hosted in the highly metamorphic gneiss of the Archaeozoic Taihua group,and the ore-bearing quartz veins are controlled by several small to medium size E–W-striking faults,i.e.,F1,F8,F7,F35,F5,and F6 from north to south(Jian et al.,2015).

关键词： Au-Mo average grade Archaeozoic Taihua group

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Petrogenesis of Early Cretaceous adakitic granodiorite: Implication for a crust thickening event within the Cathaysia Block, South China

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Science China Earth Sciences 2017年第7期60卷 1237-1255页

作者： SUN LiQiang LING HongFei ZHAO KuiDong CHEN PeiRong CHEN WeiFeng SUN Tao SHEN WeiZhou HUANG GuoLong state key laboratory for mineral Deposits research School of Earth Sciences and Engineering Nanjing University state key laboratory of geological processes and mineral resources and Collaborative Innovation Center for Exploration of Strategic mineral resources Faculty of Earth Resource China University of Geosciences research Institute No.290 China National Nuclear Corporation

Adakitic rocks in continental settings are commonly considered to be formed by partial melting of thickened or delaminated lower crust. Investigations on this kind of rocks can provide important information about crustal evolution complementary to information from other rocks. This paper reports adakitic granodiorite of the Lingxi pluton in the interior of the Cathayisa Block. LA-ICP-MS zircon U-Pb dating shows that it was formed in the late Early Cretaceous(100±1 Ma). The granodiorite has geochemical features of adakitic rocks derived from partial melting of the thickened lower crust, e.g., high SiO2(mainly ranging from 64.4 to 68.9 wt.%) and Sr(624–894 ppm) contents, Sr/Y(49.9–60.8) and La/Yb(23.4–42.8) values, low Y(10.3–17.1 ppm), Ni(5.62–11.8 ppm) and MgO(mostly from 0.86 wt.% to 1.57 wt.%) contents and weak Eu anomaly. It has initial 87Sr/86 Sr ratios of 0.7086–0.7091, εNd(t) values of.6.2 to.5.9 and zircon εHf(t) values mostly of.10.1 to.7.6. Based on the geochemical characteristics and simple modelling, it is suggested that the most likely generation mechanism of the Lingxi granodiorite is partial melting of a thickened Proterozoic lower continental crust at a pressure ≥12 kbar(or crust thickness ≥40km), leaving a garnet-bearing amphibolite residue. Combining our results and previous studies of the tectonic evolution of the Cathaysia Block, we propose that the crust was thickened to over 40 km by a compressive event occurring during the late Early Cretaceous, which is supported by the observation that there is an angular unconformity between the Upper Cretaceous Series and the early Lower Cretaceous or the Jurassic rocks. After this event, the Cathaysia Block experienced a lithospheric extension and thinning probably driven by the high-angle paleo-Pacific subduction. With the attenuation of lithosphere, the lower crust was heated to partial melting by upwelling asthenospheric materials, resulting in generation of the Lingxi granodiorite and other coeval gran

关键词： Sr-Nd-Hf isotopes Adakitic rock Thickened crest Early Cretaceous South China

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Super-Enrichment Mechanisms of Strategic Critical Metal Deposits:Current Understanding and Future Perspectives

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Journal of Earth Science 2023年第4期34卷 1295-1298页

作者： Shao-Yong Jiang Wei Wang Hui-Min Su state key laboratory of geological processes and mineral resources Collaborative Innovation Center for Exploration of Strategic Mineral ResourcesSchool of Earth ResourcesChina University of GeosciencesWuhan 430074China

0 INTRODUCTION Critical metals are a recently proposed classification for strategic metal resources in the world. These metals are essential and critical for modern industry and economic development but face high supply risks(Hou et al., 2020). Four groups of critical metals are proposed, namely, rare metals(e. g., Li, Be, Rb, Cs, Nb, Ta, Zr, Hf, W and Sn).

关键词： metals critical rare

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Orogenic Gold Deposits:mineralization Mechanism and research Perspectives

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Journal of Earth Science 2023年第6期34卷 1758-1761页

作者： Shao-Yong Jiang Ying Ma De-Liang Liu Wen-Tian Li state key laboratory of geological processes and mineral resources School of Earth ResourcesCollaborative Innovation Center for Exploration of Strategic Mineral ResourcesChina University of GeosciencesWuhan 430074China

0 INTRODUCTION Gold has been historically functioned as a strategic commodity,serving as a hard currency for international reserves,and increasingly plays a pivotal role in modern electronic communications,aerospace,and other high-tech industries.A range of geological processes (e.g.,magmatic activity,regional metamorphism,tectonic event) can result in formation of different types of gold deposits hosted in various through *** on tectonic background and genetic model,gold deposits can be classified into orogenic-,porphyry-,epithermal-,Carlin-,IOCG-(iron-oxide copper-gold)(IOCG),VMS-(volcanogenic massive sulfide),and SEDEX-(sedimentary exhalative) gold types (Kerrich et al.,2000).

关键词： magmatic tectonic gold

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Garnet-Rich Granulite Xenoliths from the Hannuoba Basalts, North China: Petrogenesis and Implications for the Mesozoic Crust-Mantle Interaction

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Journal of Earth Science 2010年第5期21卷 669-691页

作者：刘勇胜高山高长贵宗克清胡兆初凌文黎 state key laboratory of geological processes and mineral resources Faculty of Earth Sciences China University of Geosciences state key laboratory of Continental Dynamics Northwest University

Garnet-rich granulite xenoliths collected from the Hannuoba basalts, the North China craton （NCC）, were studied to reveal the Mesozoic crnst-mantle interaction. These xenoliths are characterized by low SiO2 （37.7 wt.%-46.0 wt.%） and high Al2O3 （10.8 wt.%-17.9 wt.%） contents. Their Mg# （60-75, Mg#=100×Mg/（Mg＋Fe）, atomic number） are relatively low for their low SiO2 contents. They have low rare-earth element （REE） contents and LREE-rich REE patterns, and show remarkable enrichments in Sr relative to the adjacent REE. Some of them exhibit convex RISE patterns with a maximum at Nd and remarkably positive Eu anomalies. Taking into account their high garnet mode （generally 〉30%）, these features suggest that they are high-pressure metamorphic products of lowpressure cumulates （e.g., gabbro） after it had been depressed into the garnet stability field. They have evolved Nd and Sr isotopic compositions （143Nd/144Nd=0.511 763-0.512 173, STSr/86Sr=0.705 34-0.706 99） and fall in the trend defined by the 〉110 Ma Mesozoic basalts and high-Mg# andesites from the NCC. Zircon U-Pb dating by LA-ICP-MS shows a wide age range from 83 to 2 581 Ma, most of which cluster in 83-134 Ma. CL images of some Mesozoic zircons from the granulites show typical features of igneous zircons, providing direct evidence for the Mesozoic underplating event in this area. Neither peridotite-derived basaltic underplating model nor residue model of ancient lower crust after lithospheric thinning alone can reasonably explain the above features of the garnet-Hch granulite xenoliths. Combined with the previous research, we propose that most of the granulite xenoliths from the Hannuoba basalts are products of the Mesozoic magmatie underplating and mixing with the pre-existing lower crust （i.e., AFC process）. However, the melts could be mostly derived from partial melting of basaltic layers that were previously subducted （a fossil oceanic slab） or underplated into the base of the lithospheric mantle, or from parti

关键词： garnet-rich granulite xenolith trace element zircon U-Pb age Nd and Sr isotopes crust-mantle interaction North China craton.

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Formation time of the big mantle wedge beneath eastern China and a new lithospheric thinning mechanism of the North China craton—Geodynamic effects of deep recycled carbon

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Science China Earth Sciences 2018年第7期61卷 853-868页

作者： Shuguang LI Yang WANG state key laboratory of geological processes and mineral resources China University of Geosciences CAS key laboratory of Crust-Mantle Materials and Environments school of Earth and Space Sciences University of Science and Technology of China

High-resolution P wave tomography shows that the subducting Pacific slab is stagnant in the mantle transition zone and forms a big mantle wedge beneath eastern China. The Mg isotopic investigation of large numbers of mantle-derived volcanic rocks from eastern China has revealed that carbonates carried by the subducted slab have been recycled into the upper mantle and formed carbonated peridotite overlying the mantle transition zone, which becomes the sources of various basalts. These basalts display light Mg isotopic compositions(δ26 Mg = –0.60‰ to –0.30‰) and relatively low87 Sr/86 Sr ratios(0.70314–0.70564) with ages ranging from 106 Ma to Quaternary, suggesting that their mantle source had been hybridized by recycled magnesite with minor dolomite and their initial melting occurred at 300-360 km in depth. Therefore, the carbonate metasomatism of their mantle source should have occurred at the depth larger than 360 km, which means that the subducted slab should be stagnant in the mantle transition zone forming the big mantle wedge before 106 Ma. This timing supports the rollback model of subducting slab to form the big mantle wedge. Based on high P-T experiment results, when carbonated silicate melts produced by partial melting of carbonated peridotite was raising and reached the bottom(180–120 km in depth) of cratonic lithosphere in North China, the carbonated silicate melts should have 25–18 wt% CO2 contents, with lower Si O2 and Al2 O3 contents, and higher Ca O/Al2 O3 values, similar to those of nephelinites and basanites, and have higher εNdvalues(2 to 6). The carbonatited silicate melts migrated upward and metasomatized the overlying lithospheric mantle, resulting in carbonated peridotite in the bottom of continental lithosphere beneath eastern China. As the craton lithospheric geotherm intersects the solidus of carbonated peridotite at 130 km in depth, the carbonated peridotite in the bottom of cratonic lithosphere should be partially melted, thus its physica

关键词： Big mantle wedge North China craton Lithospheric thinning Deep carbon recycling Alkaline basalts

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