The Huangtuliang monzonitic granite outcrops on the northern side of the Huangtuliang gold mining district, Chicheng, North Hebei Province. Our predecessors only made isotopic age determination using the K-Ar method. ...The Huangtuliang monzonitic granite outcrops on the northern side of the Huangtuliang gold mining district, Chicheng, North Hebei Province. Our predecessors only made isotopic age determination using the K-Ar method. Through LA-MC-ICP-MS zircon U-Pb dating and zircon Hf isotopic composition determination, this study acquired the age of 244.8±2.0 Ma(MSWD=0.57) on the basis of the weighed mean 206Pb/238U ratio, indicating that the Huangtuliang monzonitic granite was formed during the Middle Triassic period, which is the product of Early Indosinian magmatic activities in the region of North Hebei. εHf(t) values vary relatively evenly, within the range of-10.65--14.03, with an average of-12.14. The two-stage evolution model ages, tDM2, vary between 1943 and 2144 Ma, implying that the rock-forming materials of the Huangtiliang monzonitic granite mainly came from the Paleoproterozoic recirculated crustal materials, though a small quantity of enriched-mantle materials would have been involved.展开更多
Objective The Huogeqi copper-lead-zinc polymetallic deposit in Inner Mongolia is located in the western part of the Middle-Late Proterozoic Langshan rift trough situated on the northern border of North China Platform.
目的:探讨新诊断肥胖2型糖尿病患者的相关影响因素。方法:收集2017年12月至2018年6月在重庆市第五人民医院内分泌科住院的新诊断2型糖尿病患者157例为研究对象,以WHO-西太平洋区成人肥胖诊断标准,即体质指数(body mass index,BMI)25 kg...目的:探讨新诊断肥胖2型糖尿病患者的相关影响因素。方法:收集2017年12月至2018年6月在重庆市第五人民医院内分泌科住院的新诊断2型糖尿病患者157例为研究对象,以WHO-西太平洋区成人肥胖诊断标准,即体质指数(body mass index,BMI)25 kg/m2为切点分为非肥胖组87例,肥胖组70例,分析新诊断肥胖2型糖尿病患者的常规生化指标。结果:肥胖组年龄(P=0.014)、高密度脂蛋白胆固醇(high density lipoprotein cholesterol,HDL-C)(P=0.036)、总胆汁酸(total bile acid,TBA)(P=0.010)均低于非肥胖组,差异有统计学意义。Spearman相关分析显示,年龄(r=-0.191,P=0.017)、TBA(r=-0.211,P=0.008)与2型糖尿病肥胖发病呈负相关,C反应蛋白(C-reactive protein,CRP)(r=0.178,P=0.027)与2型糖尿病肥胖发病呈正相关,差异有统计学意义。二元logistic回归分析显示,TBA(OR=0.551,95%CI=0.317~0.957,P=0.034)使2型糖尿病肥胖发病的风险降低了44.9%。结论:胆汁酸可能是新诊断肥胖2型糖尿病患者的独立保护因素。展开更多
In recent years big strides have been made in the exploration of ores in the central-south segment of the Da Hinggan Ling Range,though some debates still exist on the metallogenesis and sources of ore-forming material...In recent years big strides have been made in the exploration of ores in the central-south segment of the Da Hinggan Ling Range,though some debates still exist on the metallogenesis and sources of ore-forming materials.Pyrite and other sulfides in direct relation to the Pb-Zn-Ag ore deposits were chosen for the He and Ar isotopic analysis of ore-forming fluids,and the first He and Ar isotope data have been obtained from the study region.3He/4He ratios in 14 samples collected from 7 mining districts are 2.17×10-6-12.52×10-6,averaging 6.86×10-6 and their R/Ra ratios are 1.56-9.01 Ra,averaging 4.37 Ra.By projecting the data points onto the 3He-4He concentrations diagram,all the points fall near the mantle helium area.The calculated mantle-source helium ratios are within the range of 19.58%-76.96%,with an average of 49.52%.Argon isotopic characteristics are close to those of mantle source,indicating that the ore-forming material was transport upwards via the multi-stage evolution of mantle plume and concentrated as ores in the favorable loci of mantle branch structures.展开更多
The SHRIMP U-Pb zircon dating result of the Tongshi magmatic complex in western Shandong is presented in this paper. The Tongshi magmatic complex comprises fine-grained porphyritic diorite and syenitic porphyry. Eight...The SHRIMP U-Pb zircon dating result of the Tongshi magmatic complex in western Shandong is presented in this paper. The Tongshi magmatic complex comprises fine-grained porphyritic diorite and syenitic porphyry. Eighteen analyses for fine-grained porphyritic diorite gave two concordia ages, in which ten analyses constitute the young age group, giving ^206Pb/^238U ages ranging from 167.9 Ma to 183 Ma with a weighted mean age of 175.7±3.8 Ma, and the other eight yielded ^207Pb/^206Pb ages of 2502 Ma to 2554 Ma with a weighted mean 2518±11 Ma. Two analyses for syenitic porphyry gave ages of 2485 Ma and 2512 Ma, respectively. The age of 175.7±3.8 Ma indicates that the crystallization of the Tongshi magmatic complex occurred in the Middle Jurassic, whereas that of 2518±11 Ma is interpreted as the age of inherited magmatic zircons in the Neoarchean Wutai period.展开更多
The Dajing Cu-Sn-polymetallic ore deposit is famous for its large scale, abundant associated elements, narrow and closely-spaced development of ore veins and high grade, but exploration within the mining district and ...The Dajing Cu-Sn-polymetallic ore deposit is famous for its large scale, abundant associated elements, narrow and closely-spaced development of ore veins and high grade, but exploration within the mining district and its deeper parts has revealed no Yanshanian rockbody. Therefore, there have been proposed a diversity of hypotheses on the genesis of the deposit. The authors, from the angle of mantle-branch structure, provided evidence showing that the mining district is located in the core of the Da Hinggan Ling mantle-branch structure, the multi-stage evolution of mantle plume paved the way for the ascending of deep-source ore fluids and these fluids extracted part of the ore-forming materials. Then, these ore-forming materials were concentrated in the favorable structural loci (e.g. structural fissures) to form ores. The orientation of ore-forming and ore-controlling fissures is closely related to the regionally structural stress field at the metallogenic stage. The zonation of Sn, Cu, Au, Ag, Pb, and Zn within the mining district appears to be related to metallogenesis and the crystallization temperature of ore-forming materials. Mineralization of Sn, Cu, Au, etc. which require relatively high crystallization temperature and pressure is in most cases recognized in the central part of the mining district, while that of Ag, Pb, Zn, etc. which require relatively low crystallization temperature and pressure is, for the most part, produced in the periphery of the mining district.展开更多
基金financially supported jointly by the Geological Investigation Item sponsored by the China Geological Survey (No. 1212011220492)the Scientific Research Base of China’s Typical Metallic Ores (No. 200911007)the National Natural Science Foundation of China (40872137)
文摘The Huangtuliang monzonitic granite outcrops on the northern side of the Huangtuliang gold mining district, Chicheng, North Hebei Province. Our predecessors only made isotopic age determination using the K-Ar method. Through LA-MC-ICP-MS zircon U-Pb dating and zircon Hf isotopic composition determination, this study acquired the age of 244.8±2.0 Ma(MSWD=0.57) on the basis of the weighed mean 206Pb/238U ratio, indicating that the Huangtuliang monzonitic granite was formed during the Middle Triassic period, which is the product of Early Indosinian magmatic activities in the region of North Hebei. εHf(t) values vary relatively evenly, within the range of-10.65--14.03, with an average of-12.14. The two-stage evolution model ages, tDM2, vary between 1943 and 2144 Ma, implying that the rock-forming materials of the Huangtiliang monzonitic granite mainly came from the Paleoproterozoic recirculated crustal materials, though a small quantity of enriched-mantle materials would have been involved.
基金supported by the Hebei Natural Science Foundation(grant No.D2019403015)the Scientific and Technological Research Projects of Colleges and Universities in Hebei Province(grant No.ZD2019003)+2 种基金the Graduate Demonstration Course of Hebei Province(grant No.KCJSX2018089)the Geological Prospecting Project of Western Mining Corporation(grant No.D2017091)the Key Laboratory of Regional Geology and Mineralization,Hebei GEO University(grant No.03)
文摘Objective The Huogeqi copper-lead-zinc polymetallic deposit in Inner Mongolia is located in the western part of the Middle-Late Proterozoic Langshan rift trough situated on the northern border of North China Platform.
文摘目的:探讨新诊断肥胖2型糖尿病患者的相关影响因素。方法:收集2017年12月至2018年6月在重庆市第五人民医院内分泌科住院的新诊断2型糖尿病患者157例为研究对象,以WHO-西太平洋区成人肥胖诊断标准,即体质指数(body mass index,BMI)25 kg/m2为切点分为非肥胖组87例,肥胖组70例,分析新诊断肥胖2型糖尿病患者的常规生化指标。结果:肥胖组年龄(P=0.014)、高密度脂蛋白胆固醇(high density lipoprotein cholesterol,HDL-C)(P=0.036)、总胆汁酸(total bile acid,TBA)(P=0.010)均低于非肥胖组,差异有统计学意义。Spearman相关分析显示,年龄(r=-0.191,P=0.017)、TBA(r=-0.211,P=0.008)与2型糖尿病肥胖发病呈负相关,C反应蛋白(C-reactive protein,CRP)(r=0.178,P=0.027)与2型糖尿病肥胖发病呈正相关,差异有统计学意义。二元logistic回归分析显示,TBA(OR=0.551,95%CI=0.317~0.957,P=0.034)使2型糖尿病肥胖发病的风险降低了44.9%。结论:胆汁酸可能是新诊断肥胖2型糖尿病患者的独立保护因素。
文摘In recent years big strides have been made in the exploration of ores in the central-south segment of the Da Hinggan Ling Range,though some debates still exist on the metallogenesis and sources of ore-forming materials.Pyrite and other sulfides in direct relation to the Pb-Zn-Ag ore deposits were chosen for the He and Ar isotopic analysis of ore-forming fluids,and the first He and Ar isotope data have been obtained from the study region.3He/4He ratios in 14 samples collected from 7 mining districts are 2.17×10-6-12.52×10-6,averaging 6.86×10-6 and their R/Ra ratios are 1.56-9.01 Ra,averaging 4.37 Ra.By projecting the data points onto the 3He-4He concentrations diagram,all the points fall near the mantle helium area.The calculated mantle-source helium ratios are within the range of 19.58%-76.96%,with an average of 49.52%.Argon isotopic characteristics are close to those of mantle source,indicating that the ore-forming material was transport upwards via the multi-stage evolution of mantle plume and concentrated as ores in the favorable loci of mantle branch structures.
基金This study was supported by the Major State Basic Rsearch Program of China(grant G1999043211)National Natural Science Foundation of China(grant 40272088).
文摘The SHRIMP U-Pb zircon dating result of the Tongshi magmatic complex in western Shandong is presented in this paper. The Tongshi magmatic complex comprises fine-grained porphyritic diorite and syenitic porphyry. Eighteen analyses for fine-grained porphyritic diorite gave two concordia ages, in which ten analyses constitute the young age group, giving ^206Pb/^238U ages ranging from 167.9 Ma to 183 Ma with a weighted mean age of 175.7±3.8 Ma, and the other eight yielded ^207Pb/^206Pb ages of 2502 Ma to 2554 Ma with a weighted mean 2518±11 Ma. Two analyses for syenitic porphyry gave ages of 2485 Ma and 2512 Ma, respectively. The age of 175.7±3.8 Ma indicates that the crystallization of the Tongshi magmatic complex occurred in the Middle Jurassic, whereas that of 2518±11 Ma is interpreted as the age of inherited magmatic zircons in the Neoarchean Wutai period.
基金This research was jointly granted by the Key Scientific Research Project of Inner Mongolia Geological Survey(2004-05)the National Natural Science Foundation of China(Grant No.40272088).
文摘The Dajing Cu-Sn-polymetallic ore deposit is famous for its large scale, abundant associated elements, narrow and closely-spaced development of ore veins and high grade, but exploration within the mining district and its deeper parts has revealed no Yanshanian rockbody. Therefore, there have been proposed a diversity of hypotheses on the genesis of the deposit. The authors, from the angle of mantle-branch structure, provided evidence showing that the mining district is located in the core of the Da Hinggan Ling mantle-branch structure, the multi-stage evolution of mantle plume paved the way for the ascending of deep-source ore fluids and these fluids extracted part of the ore-forming materials. Then, these ore-forming materials were concentrated in the favorable structural loci (e.g. structural fissures) to form ores. The orientation of ore-forming and ore-controlling fissures is closely related to the regionally structural stress field at the metallogenic stage. The zonation of Sn, Cu, Au, Ag, Pb, and Zn within the mining district appears to be related to metallogenesis and the crystallization temperature of ore-forming materials. Mineralization of Sn, Cu, Au, etc. which require relatively high crystallization temperature and pressure is in most cases recognized in the central part of the mining district, while that of Ag, Pb, Zn, etc. which require relatively low crystallization temperature and pressure is, for the most part, produced in the periphery of the mining district.
