The meta-basic volcanic rocks in the Tengtiaohe Zone yield zircon U–Pb ages of 258.8±2.5 Ma and 259.2±1.8 Ma, respectively which agree with the ages of flood basalts of ELIP and are similar to the basaltic ...The meta-basic volcanic rocks in the Tengtiaohe Zone yield zircon U–Pb ages of 258.8±2.5 Ma and 259.2±1.8 Ma, respectively which agree with the ages of flood basalts of ELIP and are similar to the basaltic rocks and komatiites from the Song Da Zone in northern Vietnam. The results suggest that the age of meta-basic volcanic rocks is Late Permian, rather than the Early Permian or Early Carboniferous ages as previously inferred. Most meta-basic volcanic rocks are strongly enriched in LREEs relative to HREEs and display trace element patterns similar to the ELIP high-Ti basalts, and are enriched in LILEs with negative Sr anomalies. Their initial 87^Sr/86^Sr ratios range from 0.705974 to 0.706188 and εNd（t） from-0.82 to-2.11. Their magmas were derived from an enriched and deep mantle source without significant crustal contamination. These meta-basic volcanic rocks formed in ELIP. Therefore, the Tengtiaohe Zone is not an ophiolite zone and can link to the Song Da Zone in northern Vietnam.展开更多
Recent geological study and survey on the scale of 1: 50000 in northern Guangxi have made some advancements: meta-basic-ultrabasic rocks which occured as bedding injection sheets in the Sanrnenjie formation of the Pro...Recent geological study and survey on the scale of 1: 50000 in northern Guangxi have made some advancements: meta-basic-ultrabasic rocks which occured as bedding injection sheets in the Sanrnenjie formation of the Proterozoic Danzhou group and caused contact metamorphism or hydrothermal alteration in adjacent wallrocks, were originated in extensional environment. Basic rocks belong to deep-sea tholeiite. TLe meta-basic -ultrabasic rocks sufferred intense deformation partitioning, resulting in lenticular network which was composed of mylonite zones in highly de formed field and lensoids in less- or non-deformed field. This structural pattern was explained as "melange" or "non-rooted cool intrusion " by previous workers. The deformation partitioning was mainly pure shearing in the early stage plus simple shearing in the later stage. This evolution was closely related to progressive deformation of the Guangxi orogeny.展开更多
The Ondor Sum Group in the central Inner Mongolia is mainly composed of meta-basic volcanics intercalated with ferruginous quartzite and quartz schist,and has been interpreted as slices of oceanic crust or an ophiolit...The Ondor Sum Group in the central Inner Mongolia is mainly composed of meta-basic volcanics intercalated with ferruginous quartzite and quartz schist,and has been interpreted as slices of oceanic crust or an ophiolite suite of the Early Paleozoic or much older ages.This paper presents new LA-ICP-MS zircon U-Pb dating and geochemical data for the meta-basic volcanics.The results show that zircons in the meta-basic volcanics were derived from complicated sources,most of which may be captured by basic magma from the country rocks or other sources.They yield a large age range from the Late Archean to Early Mesozoic with the youngest age group between 246 and 261 Ma,constraining the protolith of the meta-basic volcanics formed in the Late Permian to Early Triassic.The meta-basic volcanics have an affinity to E-MORB in geochemistry,and also a similarity toward OIB,representing a tectonic setting of limited intra-continental ocean basin.This limited basin might have been related to the continuous extension of the area since the Early Permian and finally closed in the Early Mesozoic.展开更多
目的通过Meta分析,系统评价半导体激光治疗慢性牙周炎的临床疗效。方法计算机检索Medline、Cochrane Library、OVID、PubMed、Web of Science、中国生物医学文献数据库、维普、万方和中国知网数据库,收集关于半导体激光应用于慢性牙周...目的通过Meta分析,系统评价半导体激光治疗慢性牙周炎的临床疗效。方法计算机检索Medline、Cochrane Library、OVID、PubMed、Web of Science、中国生物医学文献数据库、维普、万方和中国知网数据库,收集关于半导体激光应用于慢性牙周炎治疗的临床随机对照研究,检索时限均为建库至2019年4月。由2位研究员独立筛选文献、提取资料后,对纳入的文献进行质量评价,再采用RevMan 5.3软件对获取的数据进行Meta分析,当各研究之间无统计学异质性或异质性较小时,采用固定效应模型进行分析;反之,采用随机效应模型进行分析。结果最终纳入10篇文献(中文4篇,英文6篇),共245名慢性牙周炎患者。Meta分析结果显示:相较于单纯牙周基础治疗,半导体激光辅助牙周基础治疗能显著减少患者治疗后1个月、3个月的牙周探诊深度(PPD)[1个月:MD=-0.47,95%CI:(-0.79,-0.15),P=0.004;3个月:MD=-0.34,95%CI:(-0.62,-0.07),P=0.01],能有效减少患者1个月、3个月后的出血指数(BI)[1个月:MD=-0.20,95%CI:(-0.34,-0.06),P=0.006;3个月:MD=-0.18,95%CI:(-0.33,-0.03),P=0.02],也能改善患者1个月后的临床附着丧失(CAL)[MD=-0.17,95%CI:(-0.30,-0.04),P=0.01],但3个月后的CAL无明显改善。结论现有证据表明,对于慢性牙周炎,在短期的临床观察随访中,半导体激光辅助牙周基础治疗能获得更好的临床疗效。展开更多
基金supported by National Natural Science Foundation of China(Grant No.41172202,No.41190073 and No.41302178)China Geological Survey(Grant No.1212011121256)+2 种基金National Basic Research Program of China(2014CB440901)the Fundamental Research Funds for the Central Universities to SYSUState Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences in Wuhan(MSFGPMR201402)
文摘The meta-basic volcanic rocks in the Tengtiaohe Zone yield zircon U–Pb ages of 258.8±2.5 Ma and 259.2±1.8 Ma, respectively which agree with the ages of flood basalts of ELIP and are similar to the basaltic rocks and komatiites from the Song Da Zone in northern Vietnam. The results suggest that the age of meta-basic volcanic rocks is Late Permian, rather than the Early Permian or Early Carboniferous ages as previously inferred. Most meta-basic volcanic rocks are strongly enriched in LREEs relative to HREEs and display trace element patterns similar to the ELIP high-Ti basalts, and are enriched in LILEs with negative Sr anomalies. Their initial 87^Sr/86^Sr ratios range from 0.705974 to 0.706188 and εNd（t） from-0.82 to-2.11. Their magmas were derived from an enriched and deep mantle source without significant crustal contamination. These meta-basic volcanic rocks formed in ELIP. Therefore, the Tengtiaohe Zone is not an ophiolite zone and can link to the Song Da Zone in northern Vietnam.
文摘Recent geological study and survey on the scale of 1: 50000 in northern Guangxi have made some advancements: meta-basic-ultrabasic rocks which occured as bedding injection sheets in the Sanrnenjie formation of the Proterozoic Danzhou group and caused contact metamorphism or hydrothermal alteration in adjacent wallrocks, were originated in extensional environment. Basic rocks belong to deep-sea tholeiite. TLe meta-basic -ultrabasic rocks sufferred intense deformation partitioning, resulting in lenticular network which was composed of mylonite zones in highly de formed field and lensoids in less- or non-deformed field. This structural pattern was explained as "melange" or "non-rooted cool intrusion " by previous workers. The deformation partitioning was mainly pure shearing in the early stage plus simple shearing in the later stage. This evolution was closely related to progressive deformation of the Guangxi orogeny.
基金supported by the National Natural Science Foundation of China(40902021)the National Basic Research Program of China(2013CB429801)the China Survey of Geology(1212010911005)
文摘The Ondor Sum Group in the central Inner Mongolia is mainly composed of meta-basic volcanics intercalated with ferruginous quartzite and quartz schist,and has been interpreted as slices of oceanic crust or an ophiolite suite of the Early Paleozoic or much older ages.This paper presents new LA-ICP-MS zircon U-Pb dating and geochemical data for the meta-basic volcanics.The results show that zircons in the meta-basic volcanics were derived from complicated sources,most of which may be captured by basic magma from the country rocks or other sources.They yield a large age range from the Late Archean to Early Mesozoic with the youngest age group between 246 and 261 Ma,constraining the protolith of the meta-basic volcanics formed in the Late Permian to Early Triassic.The meta-basic volcanics have an affinity to E-MORB in geochemistry,and also a similarity toward OIB,representing a tectonic setting of limited intra-continental ocean basin.This limited basin might have been related to the continuous extension of the area since the Early Permian and finally closed in the Early Mesozoic.
文摘目的通过Meta分析,系统评价半导体激光治疗慢性牙周炎的临床疗效。方法计算机检索Medline、Cochrane Library、OVID、PubMed、Web of Science、中国生物医学文献数据库、维普、万方和中国知网数据库,收集关于半导体激光应用于慢性牙周炎治疗的临床随机对照研究,检索时限均为建库至2019年4月。由2位研究员独立筛选文献、提取资料后,对纳入的文献进行质量评价,再采用RevMan 5.3软件对获取的数据进行Meta分析,当各研究之间无统计学异质性或异质性较小时,采用固定效应模型进行分析;反之,采用随机效应模型进行分析。结果最终纳入10篇文献(中文4篇,英文6篇),共245名慢性牙周炎患者。Meta分析结果显示:相较于单纯牙周基础治疗,半导体激光辅助牙周基础治疗能显著减少患者治疗后1个月、3个月的牙周探诊深度(PPD)[1个月:MD=-0.47,95%CI:(-0.79,-0.15),P=0.004;3个月:MD=-0.34,95%CI:(-0.62,-0.07),P=0.01],能有效减少患者1个月、3个月后的出血指数(BI)[1个月:MD=-0.20,95%CI:(-0.34,-0.06),P=0.006;3个月:MD=-0.18,95%CI:(-0.33,-0.03),P=0.02],也能改善患者1个月后的临床附着丧失(CAL)[MD=-0.17,95%CI:(-0.30,-0.04),P=0.01],但3个月后的CAL无明显改善。结论现有证据表明,对于慢性牙周炎,在短期的临床观察随访中,半导体激光辅助牙周基础治疗能获得更好的临床疗效。
