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| 1 | Ore-forming age and tectonic setting of the Linjiasandaogou gold deposit in the Liaodong Peninsula,northeast China:constraints from geochronology and geochemistry显示文摘The Linjiasandaogou gold deposit is located in the Qingchengzi Orefield,North China Craton,China,and has not attracted many studies.We present geochronological,whole-rock geochemical,and Sr–Nd–Hf isotopic data to constrain the age and tectonic setting of the mineralization.U–Pb dating of zircon from pre-and post-ore dikes indicates the Linjiasandaogou Au deposit formed at ca.227–226 Ma.The granite porphyry(ca.227 Ma)and quartz diorite porphyry(ca.228 Ma),which are slightly older than the mineralization,have(;Sr/;Sr)i-=0.7127–0.7162,εNd(t)=–13.7 to–17.0,andεHf(t)=–14.6 to–16.9,and display enrichment in light rare earth elements and large ion lithophile elements and depletion in high field strength elements.Two lamprophyres(226 and225 Ma),which are slightly younger than the mineralization,have higher(;Sr/;Sr)i(0.7165–0.7216),negativeεNd(t)(–11.2 to–14.3)andεHf(t)(–15.6 to–18.6)values,and are enriched in light rare earth elements but depleted in high field strength elements(Nb and Ta).The geochemical characteristics of the granitoid and lamprophyres indicate a lower crustal and enriched mantle source,respectively.We infer that the Linjiasandaogou Au deposit formed in a postcollisional tectonic setting,following the collision between the North China,Yangtze craton,and Central Asian Orogeny in Triassic. | Xiaofeng Yao Tingjie Yan Zhicheng Lü Chenggui Lin Kuifeng Mi Shenghui Li Yang Li Wange Du | 2022 | Acta Geochimica2022，41，2： | 1 |
| 2 | Genetic investigation of haemoglobinopathies in a large cohort of asymptomatic individuals reveals a higher carrier rate for b-thalassaemia in Sichuan Province (Southwestern China)显示文摘The incidence of haemoglobinopathy is high in China,especially south of the Yangtze River.However,the exact status of haemoglobinopathy in Sichuan is unknown.To carry out a detailed research of haemoglobinopathy in individuals living in Sichuan,13,298 subjects without clinical symptoms who were living in Sichuan Province,with an age distribution of 5e73 years,were included in this study.Between March 2014 and July 2017,these subjects received examinations at the Medical Lab of Chengdu Women’s&Children’s Central Hospital.Mean corpuscular volume(MCV)<82 fL or mean corpuscular haemoglobin(MCH)<27 pg was used to indicate haemoglobinopathy carriers.Abnormal haemoglobin was screened by electrophoresis,and genes were sequenced to identify genotypes.Genotype diagnosis of alpha-and beta-thalassaemia was carried out by using PCR and shunt hybridization.There were 638 suspected haemoglobinopathy carriers(4.80%,638/13,298).DNA sequencing identified 6 subjects with abnormal haemoglobin genotypes and 15 subjects with Hb E.The frequency of heterozygosity for thalassaemia was 4.12%(1.48%for α-thalassaemia and 2.61%for β-thalassaemia)in Sichuan Province.The mutation spectrum of α-thalassaemia consisted of the five most common mutations:–^(SEA),-α^(3.7),-α^(4.2),α^(CS),and α^(QS).Seven types of β-thalassaemia mutation were found in this study:CD41-42(-TTCT)was the most frequent(28.47%),followed by 17(A>T),28(A>G),and IVS-Ⅱ-654(C>T).The main abnormal haemoglobin genotype(HbE)and thalassaemia genotype(–^(SEA),CD41-42(-TTCT))were consistent with those in other regions of China,but the carrier rate of β-thalassaemia in Sichuan was higher than that of α-thalassaemia. | Xia Yu Min Lin Chenggui Liu Zhiyong Liao Yongqiong Wei Rui Liu Jing Zhu | 2021 | Genes & Diseases2021，8，2： | 1 |
| 3 | Source of Ore-Forming Fluid and Material in the Baiyun Gold Deposit, Liaoning Province, NE China: Constraints from H-O-S-Pb Isotopes and in-situ Analyses of Au-Bearing Pyrites显示文摘The Baiyun deposit is a large gold deposit at the western end of the Liaoji rift zone in Liaoning Province, which has produced both auriferous quartz-vein type and altered-rock type mineralization. The ore bodies are mainly hosted in schist from the Gaixian Formation of the Liaohe Group. A detailed field geological survey showed that the quartz-vein type gold ore bodies are distributed in the near EW-trending and occur in the extensional tectonic space of schist in the Gaixian Formation, and the altered-rock type gold ore bodies are distributed in the near EW-trending structural belt and occur near in the Gaixian Formation of biotite schist, biotite granulite, marble and the upper footwall of dike. To further elucidate the source of ore-forming fluid and material in the Baiyun gold deposit, the H-O isotopes for quartz, S and Pb isotopes, in-situ trace elements for sulfides from quartz-vein and altered-rock type mineralization were studied. The H-O isotopic δD_(V-SMOW) and δ^(18)O_(H2O) values of the auriferous quartz range were from-88.8‰ to-82.2‰ and-1.95‰ to 4.85‰, respectively, suggests that the ore-forming fluids were mainly magmatic water with minor meteoric water. The distribution ranges of in-situ S isotopic compositions of Au-bearing pyrite in the quartz-vein type and altered-rock type ores were-8.38‰–-10.47‰(with average values of-7.89‰) and 11.38‰– 17.52‰(with average values of 11.55‰), respectively, indicating that the S isotopic compositions of the two ore types were clearly different. The in-situ Pb isotopic ratios changed almost uniformly, which showed that they had the same lead isotopic source. Based on the analysis of S and Pb isotopic compositions, the metallogenic materials in the Baiyun gold deposit were primarily from deep magma, and some wall rock materials may have been mixed in the metallogenic process. Co/Ni diagram shows that most Au-bearing pyrites have magmatic-hydrothermal or sedimentary alteration properties, and Au/As ratios were between 0.001 and 0.828(the average value was 0.07), indicating that the ore-forming fluid in the Baiyun gold deposit may have been deep magma. Combining the geological, trace element, and isotopic data, as well as data from previous studies, we propose that the Baiyun gold deposit is a magmatic-hydrothermal ore deposit. | Chenggui Lin Xiaofeng Yao Jingwen Mao Tingjie Yan Zhizhong Cheng Kuifeng Mi Hongxiang Jia Lujun Lin | 2023 | Journal of Earth Science2023，34，1： | 0 |
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