Based on the latest high-precision aeromagnetic data,an aeromagnetic anomaly zone is identified at Zhangsanying--Tongshanzi in northern Hebei Province.By the potential field conversion processing,including the reducti...Based on the latest high-precision aeromagnetic data,an aeromagnetic anomaly zone is identified at Zhangsanying--Tongshanzi in northern Hebei Province.By the potential field conversion processing,including the reduction to the pole,vertical derivative,upward continuation and residual anomaly,the authors analyzed the characteristics of three typical aeromagnetic anomalies in Zhangsanying--Tongshanzi aeromagnetic anomaly zone and their geological origin.The methods include the forward and inversion methods,such as 2.5D optimization fitting and Euler deconvolution.Moreover,combined with the geological outcrop,known iron deposits,ground magnetic survey and verification,the authors studied the relationship between the aeromagnetic anomalies and iron deposits.The result shows that the Zhangsanying--Tongshanzi aeromagnetic anomaly zone is composed of 10 large magnetic anomalies with high amplitude and clear boundary.The aeromagnetic anomalies are comparable and intrinsically related to the ground magnetic anomalies and IP anomalies,indicating that the anomalies are caused by magnetite deposits.It has good magnetite prospecting potential in the Zhangsanying--Tongshanzi aeromagnetic anomaly zone.展开更多
The Huoshenmiao δeposit is Mo skarn δeposit, located in the western part of the Luanchuan ore δistrict.Mineralization process can be δivided into a skarn and a quartz-sulfide episodes with six stages: prograde(I),...The Huoshenmiao δeposit is Mo skarn δeposit, located in the western part of the Luanchuan ore δistrict.Mineralization process can be δivided into a skarn and a quartz-sulfide episodes with six stages: prograde(I), retrograde(II), quartz-K-feldspar(III), quartz-molybdenite(IV), quartz-pyrite(V), and quartzcalcite(VI). A combined study of geochronology, fluid inclusion(FI), and stable isotopes was conducted to constrain the mineralization age, source of ore materials, as well as the origin and evolution of the ore-forming fluids. Molybdenite Ree Os δating indicates that the δeposit was formed in the Late Jurassic(~145 Ma). The δ^(34)S values of sulfides range from 3.0‰ to 7.1‰, implying that the ore materials in the δeposit are magmatic in origin. Three types and six subtypes of FIs are δistinguished, namely, aqueous two-phase(W_1-and W_2-type), δaughter mineral-bearing multiphase(S_1-and S_2-type), and CO_2-bearing three-phase(C_1-and C_2-type). In stages I and II, the W_1-type FIs δisplay homogenization temperatures(Th) from 496°C to >600°C, with salinities of 14.9-18.3 wt.% NaCl eqv. The FIs in stages III, IV and early stage V composed of coeval S-, C-and W-types, respectively homogenize at similar Th, suggesting the occurrence of boiling. The W1-type FIs in late stage V and stage VI, yield Th of 102-406°C and salinities of 0-4.7 wt.% NaCl eqv. The δD_(H_2O)and δ^(18) O(H_2O)values of the ore-forming fluids in quartz-sulfide episode vary from-112‰ to-76‰, and 11.0‰ to 1.0‰, respectively. All these above observations reveal that the early ore-forming fluids are magmatic in origin, and characterized by high temperature and moderate to high salinity, and gradually evolve to low temperature, low salinity meteoric water. The Huoshenmiao Mo δeposit is associated with the magmatism event induced by the protracted subduction of the Izanagi plate beneath the eastern China continent. The δecrease in temperature, salinity and f(O_2), as well as change of p H δue to boiling and fluid-rock interaction, are the main factors controlling Mo δeposition.展开更多
The study examines a water exploration and poverty alleviation project in Guyuan county.The study analyzes correlations between aquifers and multiple induced polarization(IP)parameters,including resistivity,polarizabi...The study examines a water exploration and poverty alleviation project in Guyuan county.The study analyzes correlations between aquifers and multiple induced polarization(IP)parameters,including resistivity,polarizability,deviation,half decay time,water-bearing factors,and Kc,a new parameter refined in this study.Based on the study,the well was placed accurately,and its maximum water inflow reached 30 m3/h.Kc value highlights the rate of change at early stages of IP secondary field.Kc value served as a quick indicator in this groundwater prospecting and is validated in practice.Progress has been made in finding new parameters in exploring water with IP method.Thanks to the project,local people have access to water and poverty alleviation has scored some achievements.展开更多
Natural disaster risk monitoring is an important task for disaster prevention and reduction.In the case of immovable cultural relics,however,the feedback mechanism,risk factors,monitoring logic,and monitoring indicato...Natural disaster risk monitoring is an important task for disaster prevention and reduction.In the case of immovable cultural relics,however,the feedback mechanism,risk factors,monitoring logic,and monitoring indicators of natural disaster risk monitoring are complex.How to achieve intelligent perception and monitoring of natural disaster risk for immovable cultural relics has always been a focus and a challenge for researchers.Based on the analysis of the concepts and issues related to the natural disaster risk of immovable cultural relics,this paper proposes a framework for natural disaster risk monitoring for immovable cultural relics based on the digital twin.This framework focuses on risk monitoring,including the physical entities of natural disaster risk for immovable cultural relics,monitoring indicators,and virtual entity construction.A platform for monitoring the natural disaster risk of immovable cultural relics is proposed.Using the Puzhou Ancient City Site as a test bed,the proposed concept can be used for monitoring the natural disaster risk of immovable cultural relics at different scales.展开更多
Original sedimentary manganese(Mn)deposits and supergene Mn ores are important Mn resources in China.However,the geochemical information from Chinese supergene Mn ores is scarce,and the relationship between sedimentar...Original sedimentary manganese(Mn)deposits and supergene Mn ores are important Mn resources in China.However,the geochemical information from Chinese supergene Mn ores is scarce,and the relationship between sedimentary Mn deposits and supergene Mn ores is ambiguous.In this study,we collected the original Mn-bearing dolomitic sandstones(ZK20-3 drillcore)and supergene Mn ores(Longmen Section)from eastern Hebei,North China for systematic petrographic,mineralogical and geochemical analyses.Our new data help us to figure out the transformation from original Mn-bearing deposits to supergene ores.The main minerals of original Mn-bearing dolomitic sandstones are quartz and feldspar,with minor muscovite,dolomite,rhodochrosite,ankerite,and kutnohorite.Supergene Mn-oxide ores only emerged in the middle part of the Longmen(LM)Section,and mainly contain quartz,pyrolusite,cryptomelane,todorokite and occasional dolomite.The possible transformation sequence of Mn minerals is:kutnohorite/rhodochrosite→pyrolusite(Ⅰ)→cryptomelane(todorokite)→todorokite(cryptomelane)→pyrolusite(Ⅱ).For Mn-oxide ores,Fe,Na and Si are enriched but Al,Ca,Mg and K are depleted with the enrichment of Mn.For original and supergene ores,the total rare earth element+ytterbium(∑REY)contents range from 105.68×10^(-6)to 250.56×10^(-6)and from 18.08×10^(-6)to 176.60×10^(-6),respectively.Original Mn ores have similar slightly LREE-enriched patterns,but the purer Mn-oxide ore shows a HREE-enriched pattern.In the middle part of the LM Section,positive Ce anomalies in Mn-oxide ores indicate the precipitation of Ce-bearing minerals.It implies the existence of geochemical barriers,which changed p H and Eh values due to the long-time influence of groundwater.展开更多
Due to the complicated lithology in the ES3 Member of the Shahejie Formation in the Shulu sag,Jizhong depression,it is difficult to classify the rock types and characterize the reservoirs at the marl intervals.In this...Due to the complicated lithology in the ES3 Member of the Shahejie Formation in the Shulu sag,Jizhong depression,it is difficult to classify the rock types and characterize the reservoirs at the marl intervals.In this paper,a four-element classification method has been proposed,and seven rock types have been identified by analyzing the mineral composition.The primary rock types are medium-high organic carbonate rocks and medium-high organic shaly-siliceous carbonate rocks.With the methods of field emission scanning electron microscopy,high-pressure mercury intrusion,nitrogen adsorption,and nano-CT,four types of reservoir spaces have been identified,including intra-granular pores,intergranular pores(inter-crystalline pores),organic pores,and micro-fractures.By combining the method of high-pressure mercury intrusion with the method of the nitrogen adsorption,the porosity of the marl has been measured,ranging from 0.73%to 5.39%.The distribution of the pore sizes is bimodal,and the pore types are dominated by micron pores.Through this study,it has been concluded that the sag area to the east of Well ST1H is the favorable area for the development of self-sourced and self-reservoired shale oil.According to the results of geochemical and reservoir analysis,the III Oil Group may have sweet spot layers.展开更多
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 enclaves.Biotite is ...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 enclaves.Biotite 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 conditions.In 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 granite.The results show significantly different chemical compositions from the biotite monzogranite and mafic microgranular enclaves.The crystallization of these biotite grains from the biotite monzogranite and mafic microgranular enclaves all occurred in low oxygen fugacity.The biotite grains in biotite monzogranite are rich in Fe,poor in Mg,which belong to siderophyllite.The ratios of[(Fe^(3+)+Fe^(2+))/(Fe^(3+)+Fe^(2+)+Mg2+)]are between 0.78 and 0.86.The average of FeOT(total FeO)/MgO of biotite grains in biotite monzogranite is 9.02.The 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 rocks.The 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 degrees.Biotite monzogranite and parts of mafic microgranular enclaves have a similar crystallized condition,while other mafic microgranular enclaves are different from biotite monzogranite.The differences between biotite monzogranite and mafic microgranular enclaves may be a consequence of continuous interaction between granitic and mafic magmas.展开更多
基金Supported by Project of China Geological Survey(No.DD20190028)。
文摘Based on the latest high-precision aeromagnetic data,an aeromagnetic anomaly zone is identified at Zhangsanying--Tongshanzi in northern Hebei Province.By the potential field conversion processing,including the reduction to the pole,vertical derivative,upward continuation and residual anomaly,the authors analyzed the characteristics of three typical aeromagnetic anomalies in Zhangsanying--Tongshanzi aeromagnetic anomaly zone and their geological origin.The methods include the forward and inversion methods,such as 2.5D optimization fitting and Euler deconvolution.Moreover,combined with the geological outcrop,known iron deposits,ground magnetic survey and verification,the authors studied the relationship between the aeromagnetic anomalies and iron deposits.The result shows that the Zhangsanying--Tongshanzi aeromagnetic anomaly zone is composed of 10 large magnetic anomalies with high amplitude and clear boundary.The aeromagnetic anomalies are comparable and intrinsically related to the ground magnetic anomalies and IP anomalies,indicating that the anomalies are caused by magnetite deposits.It has good magnetite prospecting potential in the Zhangsanying--Tongshanzi aeromagnetic anomaly zone.
基金funded by the National Key R&D Plan (Nos. 2017YFC0601403 and 2016YFC0600106)the National Natural Science Foundation of China (No. 41272110)the basic research program of the First Institute of Oceanography (No. 2015T02)
文摘The Huoshenmiao δeposit is Mo skarn δeposit, located in the western part of the Luanchuan ore δistrict.Mineralization process can be δivided into a skarn and a quartz-sulfide episodes with six stages: prograde(I), retrograde(II), quartz-K-feldspar(III), quartz-molybdenite(IV), quartz-pyrite(V), and quartzcalcite(VI). A combined study of geochronology, fluid inclusion(FI), and stable isotopes was conducted to constrain the mineralization age, source of ore materials, as well as the origin and evolution of the ore-forming fluids. Molybdenite Ree Os δating indicates that the δeposit was formed in the Late Jurassic(~145 Ma). The δ^(34)S values of sulfides range from 3.0‰ to 7.1‰, implying that the ore materials in the δeposit are magmatic in origin. Three types and six subtypes of FIs are δistinguished, namely, aqueous two-phase(W_1-and W_2-type), δaughter mineral-bearing multiphase(S_1-and S_2-type), and CO_2-bearing three-phase(C_1-and C_2-type). In stages I and II, the W_1-type FIs δisplay homogenization temperatures(Th) from 496°C to >600°C, with salinities of 14.9-18.3 wt.% NaCl eqv. The FIs in stages III, IV and early stage V composed of coeval S-, C-and W-types, respectively homogenize at similar Th, suggesting the occurrence of boiling. The W1-type FIs in late stage V and stage VI, yield Th of 102-406°C and salinities of 0-4.7 wt.% NaCl eqv. The δD_(H_2O)and δ^(18) O(H_2O)values of the ore-forming fluids in quartz-sulfide episode vary from-112‰ to-76‰, and 11.0‰ to 1.0‰, respectively. All these above observations reveal that the early ore-forming fluids are magmatic in origin, and characterized by high temperature and moderate to high salinity, and gradually evolve to low temperature, low salinity meteoric water. The Huoshenmiao Mo δeposit is associated with the magmatism event induced by the protracted subduction of the Izanagi plate beneath the eastern China continent. The δecrease in temperature, salinity and f(O_2), as well as change of p H δue to boiling and fluid-rock interaction, are the main factors controlling Mo δeposition.
基金This study was supported by 1:50000 Scale Regional Geological Survey of Mantouyying,Duikounao,Zhangbei County,Daxirang in Hebei Province(2200113).
文摘The study examines a water exploration and poverty alleviation project in Guyuan county.The study analyzes correlations between aquifers and multiple induced polarization(IP)parameters,including resistivity,polarizability,deviation,half decay time,water-bearing factors,and Kc,a new parameter refined in this study.Based on the study,the well was placed accurately,and its maximum water inflow reached 30 m3/h.Kc value highlights the rate of change at early stages of IP secondary field.Kc value served as a quick indicator in this groundwater prospecting and is validated in practice.Progress has been made in finding new parameters in exploring water with IP method.Thanks to the project,local people have access to water and poverty alleviation has scored some achievements.
基金National Natural Science Foundation of China(Nos.42171444,42301516)Beijing Natural Science Foundation Project-Municipal Education Commission Joint Fund Project(No.KZ202110016021)Beijing Municipal Education Commission Scientific Research Project-Science and Technology Plan General Project(No.KM202110016005).
文摘Natural disaster risk monitoring is an important task for disaster prevention and reduction.In the case of immovable cultural relics,however,the feedback mechanism,risk factors,monitoring logic,and monitoring indicators of natural disaster risk monitoring are complex.How to achieve intelligent perception and monitoring of natural disaster risk for immovable cultural relics has always been a focus and a challenge for researchers.Based on the analysis of the concepts and issues related to the natural disaster risk of immovable cultural relics,this paper proposes a framework for natural disaster risk monitoring for immovable cultural relics based on the digital twin.This framework focuses on risk monitoring,including the physical entities of natural disaster risk for immovable cultural relics,monitoring indicators,and virtual entity construction.A platform for monitoring the natural disaster risk of immovable cultural relics is proposed.Using the Puzhou Ancient City Site as a test bed,the proposed concept can be used for monitoring the natural disaster risk of immovable cultural relics at different scales.
基金supported by the National Key R&D Program of China(No.2022YFF0800200)the NSFC(Nos.U1812402 and 42072131)+6 种基金Most Special Fund(No.MSFGPMR33)from the State Key Laboratory of GPMRthe CUG Scholar Scientific Research Funds(No.2022036)the NSF of Hebei Province(No.D2021334001)Research Project of Talent Engineering Training of Hebei Province(No.B2020005007)Research Project of Postdoctoral Scientific Research Station of HBGMR(No.454-0602-YBN-Z9E4)Natural Science Foundation of Hebei Province(No.D2021334001)the Central Government Guides Local Funds for Scientific and Technological Development(No.236Z7608 G)。
文摘Original sedimentary manganese(Mn)deposits and supergene Mn ores are important Mn resources in China.However,the geochemical information from Chinese supergene Mn ores is scarce,and the relationship between sedimentary Mn deposits and supergene Mn ores is ambiguous.In this study,we collected the original Mn-bearing dolomitic sandstones(ZK20-3 drillcore)and supergene Mn ores(Longmen Section)from eastern Hebei,North China for systematic petrographic,mineralogical and geochemical analyses.Our new data help us to figure out the transformation from original Mn-bearing deposits to supergene ores.The main minerals of original Mn-bearing dolomitic sandstones are quartz and feldspar,with minor muscovite,dolomite,rhodochrosite,ankerite,and kutnohorite.Supergene Mn-oxide ores only emerged in the middle part of the Longmen(LM)Section,and mainly contain quartz,pyrolusite,cryptomelane,todorokite and occasional dolomite.The possible transformation sequence of Mn minerals is:kutnohorite/rhodochrosite→pyrolusite(Ⅰ)→cryptomelane(todorokite)→todorokite(cryptomelane)→pyrolusite(Ⅱ).For Mn-oxide ores,Fe,Na and Si are enriched but Al,Ca,Mg and K are depleted with the enrichment of Mn.For original and supergene ores,the total rare earth element+ytterbium(∑REY)contents range from 105.68×10^(-6)to 250.56×10^(-6)and from 18.08×10^(-6)to 176.60×10^(-6),respectively.Original Mn ores have similar slightly LREE-enriched patterns,but the purer Mn-oxide ore shows a HREE-enriched pattern.In the middle part of the LM Section,positive Ce anomalies in Mn-oxide ores indicate the precipitation of Ce-bearing minerals.It implies the existence of geochemical barriers,which changed p H and Eh values due to the long-time influence of groundwater.
基金supported by the National Basic Research Program of China(973 Program)(No.2014CB239001).
文摘Due to the complicated lithology in the ES3 Member of the Shahejie Formation in the Shulu sag,Jizhong depression,it is difficult to classify the rock types and characterize the reservoirs at the marl intervals.In this paper,a four-element classification method has been proposed,and seven rock types have been identified by analyzing the mineral composition.The primary rock types are medium-high organic carbonate rocks and medium-high organic shaly-siliceous carbonate rocks.With the methods of field emission scanning electron microscopy,high-pressure mercury intrusion,nitrogen adsorption,and nano-CT,four types of reservoir spaces have been identified,including intra-granular pores,intergranular pores(inter-crystalline pores),organic pores,and micro-fractures.By combining the method of high-pressure mercury intrusion with the method of the nitrogen adsorption,the porosity of the marl has been measured,ranging from 0.73%to 5.39%.The distribution of the pore sizes is bimodal,and the pore types are dominated by micron pores.Through this study,it has been concluded that the sag area to the east of Well ST1H is the favorable area for the development of self-sourced and self-reservoired shale oil.According to the results of geochemical and reservoir analysis,the III Oil Group may have sweet spot layers.
基金supported by the National Natural Science Foundation of China(No.42072222)the Fundamental Research Funds for the Central Universities,China University of Geosciences,Wuhan(Nos.CUGL180406 and CUGCJ1707)+2 种基金the Chinese Ministry of Education Fund(No.BP0719022)the Open Fund from the State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan(No.GRMR201901)Chinese Academy of Sciences(No.QYZDY-SSW-DQC017)。
文摘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 enclaves.Biotite 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 conditions.In 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 granite.The results show significantly different chemical compositions from the biotite monzogranite and mafic microgranular enclaves.The crystallization of these biotite grains from the biotite monzogranite and mafic microgranular enclaves all occurred in low oxygen fugacity.The biotite grains in biotite monzogranite are rich in Fe,poor in Mg,which belong to siderophyllite.The ratios of[(Fe^(3+)+Fe^(2+))/(Fe^(3+)+Fe^(2+)+Mg2+)]are between 0.78 and 0.86.The average of FeOT(total FeO)/MgO of biotite grains in biotite monzogranite is 9.02.The 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 rocks.The 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 degrees.Biotite monzogranite and parts of mafic microgranular enclaves have a similar crystallized condition,while other mafic microgranular enclaves are different from biotite monzogranite.The differences between biotite monzogranite and mafic microgranular enclaves may be a consequence of continuous interaction between granitic and mafic magmas.
