The Erdaogou gold deposit is located in the conjuncture of North China Carton and Xingmeng orogenic belt.The ore-forming process of Erdaogou gold deposit is divided into three stages(ⅠtoⅢ),which are quartz-pyrite st...The Erdaogou gold deposit is located in the conjuncture of North China Carton and Xingmeng orogenic belt.The ore-forming process of Erdaogou gold deposit is divided into three stages(ⅠtoⅢ),which are quartz-pyrite stage(stage I),quartz-polymetallic sulfide stage(stage II)and quartz-calcite stage(stage III).Two types of fluid inclusions is distinguished in the ore-forming stage,i.e.,aqueous type(W-type)and aqueous-carbonic type(C-type)inclusions.From the stageⅠtoⅢ,the homogenization temperature of fluid inclusions are respectively 334-395,214-364 and 172-272℃,with salinities of 7.72 wt.%-11.23 wt.%NaCl equiv.,0.20 wt.%-23.18 wt.%NaCl equiv.,and 0.35 wt.%to 5.25 wt.%NaCl equiv.The ore-forming fluids of the Erdaogou deposit have the characteristics of medium-low temperatures,moderate salinities and low densities.And the fluids belong to the CO,-H2O-NaCl system.The values ofδ34SV-CDT in sulphide samples at different stages(stages I to III)are between-2.2‰ to 2.3‰,indicating sulfur source from magma volatiles or subvolcanic rock leaching.The lead isotopes suggest that ore-forming metals may be derived from a mixture of lower crust and mantle materials.Oxygen and hydrogen isotope data at Erdaogou indicate that magmatic fluid and meteoric water may both be involved in the hydrothermal system.Based on the geological characteris-tics,fluid inclusion results,stable and radiogenic isotope results of Erdaogou gold deposit,we believe that the temperature decrease,fluid boiling are the key factors leading to the ore precipitation and the genetic type of Erdaogou gold deposit is low-sulfidation epithermal deposit.展开更多
The Erdaogou fault,also known as the 101 fault,comprises the most important NE strike component in the ore-controlling system in the Qingchengzi orefield,Liaodong Peninsula.Due to the poor outcrop conditions in the fi...The Erdaogou fault,also known as the 101 fault,comprises the most important NE strike component in the ore-controlling system in the Qingchengzi orefield,Liaodong Peninsula.Due to the poor outcrop conditions in the field,the Erdaogou fault lacks activity time constraint.We demonstrate the constraint activity time of the fault since we observe a lamprophyre that was cut through by the Erdaogou fault in the Taoyuan area,central to the Qingchengzi orefield.Zircon grains from the lamprophyre dyke exhibit typical oscillatory zoning and yield weighted mean U–Pb age of 223.8±1.1 Ma(MSWD=1.5).The lower activity time limit of the Erdaogou fault is thus first constrained as 224 Ma or so and is correlated with the crystallization age of the Xinling and Shuangdinggou plutons within the orefield.Taking previous mineralization studies into consideration,a Triassic tectonic-magmatism-mineralization model is approved in the Qingchengzi orefield.展开更多
The study of rare earth element pattern in rhyolites of the Erdaogou gold deposit located in western Liaoning Province indicates that the REE pattern in unaltered rhyolite is characterized by typical enrichment in LRE...The study of rare earth element pattern in rhyolites of the Erdaogou gold deposit located in western Liaoning Province indicates that the REE pattern in unaltered rhyolite is characterized by typical enrichment in LRE and minor negative Eu anomaly, but altered rhyolites are characterized by distinct Eu negative anomaly, except Eu, and the other REE is similar to that in unaltered rhyolite. The reason of formation of sharp negative Eu anomaly in altered rhyolite is that secondary minerals are able to accommodate RE(3+) and not to accommodate Eu2+ during alteration process. The REE pattern in fluid formed by mixing of magmatic water with meteoric water is characterized by low REE contents, enrichment in LRE and sharp negative Eu anomaly.展开更多
A genus within the family Douvillinidae of the order Strophomenida from the Erdaogou Memberof the Xibiehe Formation in the Early Devonian of central Jilin has been re-examined, with considerationgiven to the 56 specim...A genus within the family Douvillinidae of the order Strophomenida from the Erdaogou Memberof the Xibiehe Formation in the Early Devonian of central Jilin has been re-examined, with considerationgiven to the 56 specimens collected and described by Liu and Huang (1977). Based on its distinct externalornamentation and internal characteristics, it has been classified as Cymostrophia (Protocymostrophia). It isconcluded that the three specices described by Liu and Huang (1977), Idioglyptus alatus, I. semicircularis,I. subquadratus, as well as the Mesodouvillina jilinensis Su, 1980 should be considered synonyms and benamed Cymostrophia (Protocymostrophia) alatus (Liu) Li.展开更多
基金This research was supported by the National Key Development Project(No.2018YFC0603804)China Geological Survey(No.DD20190042)Opening Foundation of Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Natural Resources.
文摘The Erdaogou gold deposit is located in the conjuncture of North China Carton and Xingmeng orogenic belt.The ore-forming process of Erdaogou gold deposit is divided into three stages(ⅠtoⅢ),which are quartz-pyrite stage(stage I),quartz-polymetallic sulfide stage(stage II)and quartz-calcite stage(stage III).Two types of fluid inclusions is distinguished in the ore-forming stage,i.e.,aqueous type(W-type)and aqueous-carbonic type(C-type)inclusions.From the stageⅠtoⅢ,the homogenization temperature of fluid inclusions are respectively 334-395,214-364 and 172-272℃,with salinities of 7.72 wt.%-11.23 wt.%NaCl equiv.,0.20 wt.%-23.18 wt.%NaCl equiv.,and 0.35 wt.%to 5.25 wt.%NaCl equiv.The ore-forming fluids of the Erdaogou deposit have the characteristics of medium-low temperatures,moderate salinities and low densities.And the fluids belong to the CO,-H2O-NaCl system.The values ofδ34SV-CDT in sulphide samples at different stages(stages I to III)are between-2.2‰ to 2.3‰,indicating sulfur source from magma volatiles or subvolcanic rock leaching.The lead isotopes suggest that ore-forming metals may be derived from a mixture of lower crust and mantle materials.Oxygen and hydrogen isotope data at Erdaogou indicate that magmatic fluid and meteoric water may both be involved in the hydrothermal system.Based on the geological characteris-tics,fluid inclusion results,stable and radiogenic isotope results of Erdaogou gold deposit,we believe that the temperature decrease,fluid boiling are the key factors leading to the ore precipitation and the genetic type of Erdaogou gold deposit is low-sulfidation epithermal deposit.
基金financially supported by the National Key Research and Development Program of China (Grant No. 2018YFC0603804, 2016YFC0600108)Geological Survey Project of China (Grant No. DD20190156)the China Scholarship Council
文摘The Erdaogou fault,also known as the 101 fault,comprises the most important NE strike component in the ore-controlling system in the Qingchengzi orefield,Liaodong Peninsula.Due to the poor outcrop conditions in the field,the Erdaogou fault lacks activity time constraint.We demonstrate the constraint activity time of the fault since we observe a lamprophyre that was cut through by the Erdaogou fault in the Taoyuan area,central to the Qingchengzi orefield.Zircon grains from the lamprophyre dyke exhibit typical oscillatory zoning and yield weighted mean U–Pb age of 223.8±1.1 Ma(MSWD=1.5).The lower activity time limit of the Erdaogou fault is thus first constrained as 224 Ma or so and is correlated with the crystallization age of the Xinling and Shuangdinggou plutons within the orefield.Taking previous mineralization studies into consideration,a Triassic tectonic-magmatism-mineralization model is approved in the Qingchengzi orefield.
文摘The study of rare earth element pattern in rhyolites of the Erdaogou gold deposit located in western Liaoning Province indicates that the REE pattern in unaltered rhyolite is characterized by typical enrichment in LRE and minor negative Eu anomaly, but altered rhyolites are characterized by distinct Eu negative anomaly, except Eu, and the other REE is similar to that in unaltered rhyolite. The reason of formation of sharp negative Eu anomaly in altered rhyolite is that secondary minerals are able to accommodate RE(3+) and not to accommodate Eu2+ during alteration process. The REE pattern in fluid formed by mixing of magmatic water with meteoric water is characterized by low REE contents, enrichment in LRE and sharp negative Eu anomaly.
基金Supported by the National Natural Science Foundation of China Nos.41702011 and 41372019.
文摘A genus within the family Douvillinidae of the order Strophomenida from the Erdaogou Memberof the Xibiehe Formation in the Early Devonian of central Jilin has been re-examined, with considerationgiven to the 56 specimens collected and described by Liu and Huang (1977). Based on its distinct externalornamentation and internal characteristics, it has been classified as Cymostrophia (Protocymostrophia). It isconcluded that the three specices described by Liu and Huang (1977), Idioglyptus alatus, I. semicircularis,I. subquadratus, as well as the Mesodouvillina jilinensis Su, 1980 should be considered synonyms and benamed Cymostrophia (Protocymostrophia) alatus (Liu) Li.
