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Early Ordovician-Middle Silurian Subduction-Closure of the Proto-Tethys Ocean:Evidence from the Qiaerlong Pluton at the Northwestern Margin of the West Kunlun Orogenic Belt,NW China

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Journal of Earth Science 2024年第2期35卷 430-448页

作者： Jinhong Xu Zhengwei Zhang Chengquan Wu Taiyi Luo weiguang zhu Xiyao Li Ziru Jin Pengcheng Hu State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang550018China University of Chinese Academy of Sciences Beijing100049China

Early Paleozoic magmatism in the West Kunlun Orogenic Belt(WKOB)preserves important information about the tectonic evolution of the Proto-Tethys *** paper reports whole-rock compositions,zircon and apatite U-Pb dating,and zircon Hf isotopes for the Qiaerlong Pluton(QEL)at the northwestern margin of WKOB,with the aim of elucidating the petrogenesis of the pluton and shedding insights into the subduction-collision process of this oceanic *** QEL is mainly composed of Ordovician quartz monzodiorite(479±3 Ma),quartz monzonite(467–472 Ma),and syenogranite(463±4 Ma),and is intruded by Middle Silurian peraluminous granite(429±20 Ma)and diabase(421±4 Ma).Zirconε_(Hf)(t)values reveal that quartz monzodiorites(+2.1 to+9.9)and quartz monzonites(+0.6 to+6.8)were derived from a mixed source of juvenile crust and older lower crust,and syenogranites(−5.6 to+4.5)and peraluminous granites(−2.9 to+2.0)were generated from a mixed source of lower crust and upper crust;diabases had zirconε_(Hf)(t)values ranging from−0.3 to+4.1,and contained 463±5 Ma captured zircon and 1048±39 Ma inherited zircon,indicating they originated from enriched lithospheric mantle and were contaminated by crustal *** Ordovician granitoids are enriched in LILEs and light rare-earth elements,and depleted in HFSEs with negative Nb,Ta,P,and Ti anomalies,suggesting that they formed in a subduction *** Silurian peraluminous granites have the characteristics of leucogranites with high SiO_(2)contents(74.92 wt.%–75.88 wt.%)and distinctly negative Eu anomalies(δEu=0.03–0.14),indicating that they belong to highly fractionated granite and were formed in a post-collision extension *** analysis of these results with other Early Paleozoic magmas reveals that the Proto-Tethys ocean closed before the Middle Silurian and its southward subduction resulted in the formation of QEL.

关键词： subduction-closure Qiaerlong Pluton West Kunlun Orogen Proto-Tethys Ocean tectonics geochemistry

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Early Crystallized Titanomagnetite from Evolved Magmas and Magma Recharge in the Mesoproterozoic zhuqing Oxide-Bearing Gabbroic Intrusions,Sichuan,SW China

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Acta Geologica Sinica(English Edition) 2017年第2期91卷 486-499页

作者： FAN Hongpeng zhu weiguang State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081GuizhouChina

The ca. 1.5 Ga mafic intrusions in the zhuqing area, predominantly composed of alkaline gabbroic rocks in the Kangdian region of SW China, occur as dykes or irregular small intrusions hosting Fe–Ti–V mineralization. All of the intrusions that intrude the dolomite or shales of the Mesoproterozoic Heishan Formation of the Huili Group are composed of three cyclic units from the base upward： a marginal cyclic unit, a lower cyclic unit and an upper cyclic unit. The Fe–Ti–V oxide ore bodies are hosted in the lower and upper cyclic units. The textural relationships between minerals in the intrusions suggest that titanomagnetite formed earlier than silicate grains because euhedral magnetite and ilmenite grains were enclosed in clinopyroxene and plagioclase. Both the magnetitess–ilmenitess intergrowths due to subsolidus oxidation–exsolutions and the relative higher V distribution coefficient between magnetite and silicate melts in the gabbros from the zhuqing area are different from those of other typical Fe–Ti bearing mafic rocks, suggesting that the oxygen fugacity was low in the gabbric rocks from the zhuqing area. This finding was further confirmed by calculations based on the compositions of magnetite and ilmenite pairs. The clinopyroxene, magnetite and ilmenite in the intrusions from the zhuqing area had considerably lower Mg O than those of other typical Fe–Ti oxide-rich complexes, suggesting that the titanomagnetite from the intrusion may have crystallized at a relatively late stage of evolution from a more evolved magma. Titanomagnetite first fractionally crystallized and subsequently settled in the lower parts of the magma chamber, where it concentrated and formed Fe–Ti–V oxide ore layers at the bases of the lower and upper cycles. Moreover, the occurrence of multiple Fe-Ti oxide layers alternating with Fe-Ti oxide-bearing silicate layers suggests that multiple pulses of magma were involved in the formation of the intrusions and related Fe-Ti-V oxide deposits in th

关键词： Fe–Ti oxide mineral chemistry patrogenesis Mesoproterozoic zhuqing oxide ore deposits Kangdian region SW china East margin of Tibetan Plateau Proto-Tethys

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Organic geochemistry characteristics of Jurassic black shales from the Amdo area, northern Tibet, China

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Acta Geochimica 2022年第3期41卷 393-405页

作者： Guiwen Xu Lan Chen weiguang zhu Xuejuan Da Zhangxiong zhu Haisheng Yi State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of Sciences99 West Lincheng RoadGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China Department of Earth Sciences Chongqing University of Science and TechnologyChongqing 401331China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China

The Jurassic black shales of the Qiangtang Basin,northern Tibet are known to be amongst the most important source *** date,there is no detailed study on the organic geochemistry of the Bathonian/Callovian coccolith-bearing sediments and their source-rock ***,we focus on the black limestones,marls,and shales at the Amdo 114 station section using Rock–Eval pyrolysis and biomarkers for sources,types,and thermal maturity of organic matter and the reconstructed depositional *** samples are characterized by(1)relatively high TOC values(0.20–2.56 wt%)and relatively low Tmax values between 428 and 452℃;(2)shortchain n-alkanes with a maximum at C_(14) to C_(18) and Pr/Ph>1;(3)31–35 homohopanes and gammacerane with lower abundance;and (4)C_(27)–C_(28)–C_(29) regular steranes with C_(29) being slightly *** organic matter is TypeⅡand thus dominantly derived from phytoplankton,especially *** maturity indicators include the Ts/(Ts+Tm),C_(31)22S/(22S+2R),C_(29)aaa20S/(20S+0R),C_(29)ββ/(ββ+aa)and C_(27)Dia/(Dia+Reg),which are regarded as immature to very early ***,the high Pr/Ph,Pr/nC_(17),and Ph/nC_(18) ratios,Pr/Ph vs Gammacerane index suggest that these black shales were deposited in unstratified marine waters of normal salinity under dysoxic to weakly reduced conditions.

关键词： Rock–Eval pyrolysis Biomarkers Source rocks Jurassic Northern Tibet

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Platinum-Group Element Geochemical Characteristics of the Picrites and High-Ti Basalts in the Binchuan Area,Yunnan Province

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Acta Geologica Sinica(English Edition) 2013年第1期87卷 158-175页

作者： BAI Mei ZHONG Hong zhu weiguang BAI Zhongjie HE Defeng State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of Sciences Chengdu University of Technology Graduate University of Chinese Academy of Sciences

The Binchuan area of Yunnan is located in the western part of the Emeishan large igneous province in the western margin of the Yangtze Block. In the present study, the Wuguiqing profile in thickness of about 1440 m is mainly composed of high-Ti basalts, with minor picrites in the lower part and andesites, trachytes, and rhyolites in the upper part. The picrites have relatively higher platinum- group element （PGE） contents （PGE=16.3-28.2 ppb）, with high Cu/Zr and Pd/Zr ratios, and low S contents （5.03-16.9 ppm）, indicating the parental magma is S-unsaturated and generated by high degree of partial melting of the Emeishan large igneous province （ELIP） mantle source. The slightly high Cu/Pd ratios （11 000-24 000） relative to that of the primitive mantle suggest that 0.007% sulfides have been retained in the mantle source. The PGE contents of the high-Ti basalts exhibit a wider range （~PGE=0.517-30.8 ppb）. The samples in the middle and upper parts are depleted in PGE and have ~Nd （260 Ma） ratios ranging from -2.8 to -2.2, suggesting that crustal contamination of the parental magma during ascent triggered sulfur saturation and segregation of about 0.446%-0.554% sulfides, and the sulfide segregation process may also provide the ore-forming material for the magmatic Cu-Ni-PGE sulfide deposits close to the studied basalts. The samples in this area show Pt- Pd type primitive mantle-normalized PGE patterns, and the Pd/Ir ratios are higher than that of the primitive mantle （Pd/Ir=l）, indicating that the obvious differentiation between Ir-group platinum- group elements （IPGE） and Pd-group platinum-group elements （PPGE） are mainly controlled by olivine or chromites fractionation during magma evolution. The Pd/Pt ratios of most samples are higher than the average ratio of mantle （Pd/Pt=0.55）, showing that the differentiation happened between Pt and Pd. The differentiation in picrites may be relevant to Pt hosted in discrete refractory Pt-alloy phase in the mantle; whereas the dif

关键词： Picrites high-Ti basalts platinum-group element Emeishan large igneous province,sulfide segregation

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Platinum-group element geochemistry of mafic rocks from the Dongchuan area,southwestern China

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Acta Geochimica 2017年第1期36卷 52-65页

作者： Siqi Yang Hong Zhong weiguang zhu Wenjun Hu Zhongjie Bai State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of SciencesGuiyang 550081 China University of Chinese Academy of Sciences Beijing 100049China

Mafic intrusions and dykes are well preserved in the Yinmin and Lanniping districts, located within the western margin of the Yangtze Block, SW China. Although these mafic rocks from the two areas formed during different periods, they share similar ranges of PGE concentration. Most of the Yinmin gabbroic dykes contain relatively high PGE concentrations （PGEs=13.9-87.0 ppb） and low S contents （0.003 %-0.020 %）, higher than the maximum PGE concentrations of mafic magmas melting from the mantle. Two exceptional Yinmin samples are characterized by relatively low PGE （PGEs = 0.31-0.37 ppb）and high S （0.114 %-0.257 %） contents. In contrast, most samples from the Lanniping gabbroic intrusion have low PGE con- centrations （PGEs = 0.12-1.02 ppb） and high S contents （0.130 %-0.360 %）, except that the three samples exhibit relatively high PGE （PGEs=16.3-34.8 ppb） and low S concentrations （0.014 %-0.070 %）. All the Yinmin and Lanniping samples are characterized by the enrichment of PPGE relative to IPGE in the primitive-mantle normalized diagrams, and the high-PGE samples exhibit obvious Ru anomalies. This study suggests that during the ascent of the parental magma, removal of Os-Ir-Ru alloys and/or chro- mite/spinel leads to high Pd/Ir ratios and Ru anomalies for the Yinmin high-PGE samples and relatively lower Pd/lr ratios and Ru anomalies for the Lanniping low-PGE samples. We propose that the magmas parental to the Yinmin gabbroic dykes are initially S-unsaturated, and subsequently, minor evolved magma reached sulfur saturation and led to sulfide segregation. Although the Lanniping parental magmas are originally not saturated in S, the high Cu/Pd ratios （3.8× 10^4 to 3.2 × 10^6） for most of the Lanniping samples indicate the S-saturated state and sulfide segregation. A calculation shows that the PGE-poor magmas might have experienced 0.01%-0.1%sulfidesegregationinthemagma chamber. Therefore, our study provides a possible opportunity to discover PGE-enriched sulfide mineraliz

关键词： Mafic intrusions and dykes Platinum groupelement Sulfide saturation Dongchuan area

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Enrichment of Platinum-group Elements(PGE) and Re-Os Isotopic Tracing for Porphyry Copper(Gold) Deposits

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Acta Geologica Sinica(English Edition) 2014年第4期88卷 1288-1309页

作者： HE Xiaohu ZHONG Hong zhu weiguang BAI Zhongjie HU Wenjun State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of Sciences University of Chinese Academy of Sciences

Platinum-group elements （PGE） in PGE-rich porphyry copper （gold） deposits are mainly Pt and Pd, whereas the concentrations of other PGE （Ru, Rh, Os, Ir） are significantly low. Moreover, Pt and Pd mainly exist in sulfides in the forms of crystal lattice or tiny platinum-group mineral （PGM） inclusions. The present data show that there is a positive relationship between Pt and Pd concentrations and Cu （Au） in porphyry copper （gold） deposits. The comparison of chondrite-normalized PGE distribution patterns between the ore-bearing porphyry intrusions and ore-barren porphyry intrusions in arc setting, 187^Os/188^Os, 87^Sr/86^Sr and S isotopes for porphyry copper （gold） deposits shows that PGEs were mainly derived from the mantle, and fluids from subduction zones devoted trivial PGE to the magma. The porphyry copper （gold） deposits associated with subducted events are most probably enriched in PGE, whereas those related to crustal thickening, lithospheric delamination or underplating rarely concentrate PGE. The osmium isotopic compositions in porphyry copper （gold） deposits reveal that （187^Os/188^Os）i values are highly variable and not lower than those of primitive upper mantle （PUM） and mantle peridotite, however, osmium concentrations are commonly lower than mantle peridotite, suggesting that parental magmas of some porphyry intrusions had experienced crustal contamination during magma evolution. Experimental investigations have proved that PGE exist in the forms of Cl^- and HS^- complexes during transportation and migration of the oreforming fluids. This paper summarizes previous studies including crucial controlling factors and mechanisms for PGE enrichment, and points out that the mantle-derived magmas parental to porphyry intrusions are the prerequisite for PGE enrichment in porphyry copper （gold） deposits. Favorable physical and chemical conditions （including salinity, temperature, pressure, pH, and oxygen fugacity） in hydrothermal fluids crucially control the PGE

关键词： PGE Re-Os isotope forms of migration enrichment process porphyry copper (gold)deposits.

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Using trace elements of magnetite to constrain the origin of the Pingchuan hydrothermal low-Ti magnetite deposit in the Panxi area, SW China

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Acta Geochimica 2019年第3期38卷 376-390页

作者： Yanjun Wang weiguang zhu Hong Zhong Zhongjie Bai Junhua Yao Chong Xu State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

The Pingchuan iron deposit, located in the Yanyuan region of Sichuan Province, SW China, has an ore reserve of 40 Mt with ~60 wt% Fe. Its genesis is still poorly understood. The Pingchuan iron deposit has a paragenetic sequence of an early Fe-oxide–Pyrite stage(Ⅰ) and a late Fe-oxide–pyrrhotite stage(Ⅱ). Stage Ⅰ magnetite grains are generally fragmented, euhedral–subhedral, largesized crystals accompanying with slightly postdated *** Ⅱ magnetite grains are mostly unfragmented, anhedral, relatively small-sized grains that co-exist with pyrrhotite. Combined with micro-textural features and previously-obtained geochronological data, we consider that these two stages of iron mineralization in the Pingchuan deposit correspond to the Permian ELIP magmatism and Cenozoic fault activity event. Both the Stage Ⅰ and Ⅱ magnetites are characterized with overall lower contents of trace elements(including Cr, Ti, V, and Ni) than the ELIP magmatic magnetite, which suggests a hydrothermal origin for them. ‘‘Skarn-like'' enrichment in Sn, Mn, and Zn in the Stage Ⅰ magnetite grains indicate significant material contributions from carbonate wall-rocks due to water–rock interaction in ore-forming processes. Stage Ⅱ magnetite grains contain higher Mn concentrations than Stage Ⅰ magnetite grains, which possibly implies more contribution from carbonate rocks. In multiple-element diagrams, the Stage Ⅰ magnetite shows systematic similarities to Kiruna-type magnetite rather than those from other types of deposits. Combined with geological features and previous studies on oxygen isotopes, we conclude that hydrothermal fluids have played a key role in the generation of the Pingchuan low-Ti iron deposit.

关键词： SW China Pingchuan iron deposit Low-Ti iron deposit Hydrothermal magnetite

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Platinum-group element(PGE)geochemistry of the Emeishan basalts in the Pan-Xi area,SW China

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Chinese Science Bulletin 2006年第7期51卷 845-854页

作者： ZHONG Hong zhu weiguang QI Liang ZHOU Meifu SONG Xieyan ZHANG Yi Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Department of Earth Sciences University of Hong Kong Hong Kong China Geological Team 106 Bureau of Geology and Mineral Resources of Sichuan Province Chengdu 611130 China

在 Pan-Xi 区域的 Longzhoushan 和 Ertan 暗岩被部分融化的相对低的度产生(<7% ，在哪个期间当磅和 Pd 是不兼容的时，红外， Ru，和 Rh 是兼容的。大多数这些样品原始披风比那些有高 PGE 集中和大部分 higherPd/lr 和 Cu/Pd 比率。硫... 详细信息

在 Pan-Xi 区域的 Longzhoushan 和 Ertan 暗岩被部分融化的相对低的度产生(<7% ，在哪个期间当磅和 Pd 是不兼容的时，红外， Ru，和 Rh 是兼容的。大多数这些样品原始披风比那些有高 PGE 集中和大部分 higherPd/lr 和 Cu/Pd 比率。硫化物的小数量(~0.007%) 在部分融化期间留在披风来源，而岩浆的部分到达了硫化物浸透和分离 PGE 富有的硫化物(~0.020%-0.033 百分比) 在期间上升时期。锇，红外，和磅能形成在部分结晶化期间在铬铁矿或硫化物招待的金属性的合金处理的铂组，导致磅和 Pd 内容的去耦和红外内容的可观的变化。硫化物从玄武岩的岩浆分离了可以在岩浆水管附近在 themafic-ultramafic 侵入为 Cu-Ni-PGE 存款(矿化作用) 的形成提供重要材料来源。

关键词：铂族元素地球化学玄武岩硫化物攀西地区

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U-Pb Geochronology, Elemental and Sr-Nd Isotopic Geochemistry of the Houyaoyu Granite Porphyries： Implication for the Genesis of Early Cretaceous Felsic Intrusions in East Qinling

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Journal of Earth Science 2018年第4期29卷 920-938页

作者： Xiaohu He Hong Zhong Zhifang Zhao Shucheng Tan weiguang zhu Siqi Yang Wenjun Hu Zhong Tang Congfa Bao Department of Geology School of Resource Environment and Earth Science Yunnan University Kunming 650091 China State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China University of Chinese Academy of Sciences Beijing 100049 China Kunming University of Science and Technology Kunming 650093 China Institute of Yunnan Geology Survey Kunming 650051 China

The Early Cretaceous Houyaoyu granite porphyries are located in the south margin of the North China Craton. Field observations, petrography, geochronology, major and trace elemental and Sr-Nd isotopic compositions are reported to elucidate the genesis of the Houyaoyu granite porphyries. SIMS zircon U-Pb analyses for the Houyaoyu granite porphyries yield two concordant ages of 133.2±2.3 （2σ） and 131±1.1 （2σ） Ma, respectively. Major and trace elemental compositions indicate that these porphyries are high-K I-type granites with high contents of SiO2, K20, Rb, U, Pb, low Nb, Ta, Ti, and P. Initial S：Sr/S6Sr ratios range from 0.708 3 to 0.709 7, and εNd（t） values range from -9.13 to -12.3, with corresponding two-stage depleted-mantie Nd model ages （T2DM） varying from 1.57 to 1.91 Ga. This suggests that the Houyaoyu granite porphyries were predominantly derived from ancient lower conti- nental crust, with minor involvement of mantie-derived components. On the basis of the tectonic evolution of the Qinling Orogen and geochemical characteristics of the Houyaoyu granite porphyries, it is proposed that they were formed in an extensional tectonic setting related to lithospheric destruction of the North China Craton, and produced Mo and Pb-Zn mineralization in East Qinling Orogen. KEY WORDS： East Qinling, granite porphyries, ancient lower continental crust, destruction of North China Craton.

关键词： East Qinling granite porphyries ancient lower continental crust destruction of NorthChina Craton.

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Experimental investigation for temperature and emissivity by flame emission spectrum in a cavity of rocket based combined cycle combustor chamber

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DEFENCE TECHNOLOGY 2024年第9期39卷 114-122页

作者： Cai, weiguang Zheng, Shu Wang, Yan Liu, Bing zhu, Shaohua Zhao, Li Lu, Qiang North China Elect Power Univ Natl Engn Res Ctr New Energy Power Generat Beijing 102206 Peoples R China Northwestern Polytech Univ Internal Flow & Thermal Struct Lab Sci & Technol Combust Xian 710072 Peoples R China

Flame temperature and spectral emissivity were the important parameters characterizing the sufficient degree of fuel combustion and the particle radiative characteristics in the Rocket Based Combined Cycle (RBCC) combustor. To investigate the combustion characteristics of the complex supersonic flame in the RBCC combustor, a new radiation thermometry combined with Levenberg-Marquardt (LM) algorithm and the least squares method was proposed to measure the temperature, emissivity and spectral radiative properties based on the flame emission spectrum. In-situ measurements of the flame temperature, emissivity and spectral radiative properties were carried out in the RBCC direct-connected test bench with laser-induced plasma combustion enhancement (LIPCE) and without LIPCE. The flame average temperatures at fuel global equivalence ratio (a) of 1.0b and 0.6 with LIPCE were 4.51% and 2.08% higher than those without LIPCE. The flame combustion oscillation of kerosene tended to be stable in the recirculation zone of cavity with the thermal and chemical effects of laser induced plasma. The differences of flame temperature at a = 1.0b and 0.6 were 503 K and 523 K with LIPCE, which were 20.07% and 42.64% lower than those without LIPCE. The flame emissivity with methane assisted ignition was 80.46% lower than that without methane assisted ignition, due to the carbon-hydrogen ratio of kerosene was higher than that of methane. The spectral emissivities at 600 nm with LIPCE were 1.25%, 22.2%, and 4.22% lower than those without LIPCE at a = 1.0a (with methane assisted ignition), 1.0b (without methane assisted ignition) and 0.6. The effect of concentration in the emissivity was removed by normalization to analyze the flame radiative properties in the RBCC combustor chamber. The maximum differences of flame normalized emissivity were 50.91% without LIPCE and 27.53% with LIPCE. The flame radiative properties were stabilized under the thermal and chemical effects of laser induced plasma

关键词： Rocket-based combined-cycle Supersonic combustion Flame temperature measurement Emissivity Laser induced plasma combustion enhancement STOKES-RAMAN SPECTROSCOPY

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