In this paper, we report an integrated study of trace element, U-Pb age and Hf isotopic composition of zircons from alkali feldspar granites, granodiorites and diorite enclaves in a recently discovered ring complex at...In this paper, we report an integrated study of trace element, U-Pb age and Hf isotopic composition of zircons from alkali feldspar granites, granodiorites and diorite enclaves in a recently discovered ring complex at Lianghe in western Yunnan, Chi na. The granitoids showed identical U-Pb ages of 127, 115 and 122 Ma, from felsic to mafic, but had different zircon trace el ements and Hf isotopic compositions. Trace element content decreased with a gradual increase in εHf(t) values of ?9.1 to ?5.4, ?4.5 to 0, and 3.6 to 6.2, respectively. Results indicate that changes in zircon trace elements generally correlate with changes in Hf isotope signatures within single samples and among various granitoids. These relationships reflect the mixing of felsic and mafic magmas. Evidence indicates that depleted mantle-derived mafic magma underplating caused ancient crustal melting, and then formed large-scale granites in Lianghe during the Early Cretaceous. These granodiorites were formed mainly by the mix ing of mafic magma and granitic magma.展开更多
In this paper,we report an integrated study of U-Pb age and Hf isotope compositions of zircons from biotite plagioclase gneiss at Lianghe in western Yunnan.The zircons preserved inherited core and rim texture.Igneous ...In this paper,we report an integrated study of U-Pb age and Hf isotope compositions of zircons from biotite plagioclase gneiss at Lianghe in western Yunnan.The zircons preserved inherited core and rim texture.Igneous zircon grains and rims yielded a weighted mean ^（206）Pb/^（238）U age of 120.4±1.7 Ma,theirε_（Hf）（120 Ma）values were mainly negative ranging from-13.9 to-10.7,with Hf model ages between 1.9 Ga and 2.0 Ga,some zircons had positiveε_（Hf）（120 Ma）values ranging from 0.2 to 2.1.The inherited cores showed the wide variations in the U-Pb age of 375-1315 Ma.One of them showed theε_（Hf）（506 Ma）value of-4.2,it was similar to the gray gneiss of old crust,whichε_（Hf）（500 Ma） values were negative ranging from-4.5 to-3.3.Combining geological feature and geochemical data,we concluded that the protolith of biotite plagioclase gneiss was old crust-derived tonalitic magma during the early Cretaceous.展开更多
目的:观察两合汤对肝郁阴虚型不寐病临床疗效。方法:将符合条件的42例肝郁阴虚型不寐病患者按照随机数字表法平均分为2组,每组21人。治疗组给予两合汤口服,对照组给予天王补心汤口服。经过4周的治疗,观察对照组和治疗组治疗前后的匹兹...目的:观察两合汤对肝郁阴虚型不寐病临床疗效。方法:将符合条件的42例肝郁阴虚型不寐病患者按照随机数字表法平均分为2组,每组21人。治疗组给予两合汤口服,对照组给予天王补心汤口服。经过4周的治疗,观察对照组和治疗组治疗前后的匹兹堡睡眠质量指数(Pittsburgh Sleep Quality Index score,PSQI)评分,中医症候评分变,不良反应发生情况和睡眠改善情况。疗程为4周。结果:1)匹兹堡睡眠质量指数(PSQI)的变化:经过4周治疗后,2组的PSQI总分较治疗前均有所下降。经过4周治疗,2组间的PSQI总分之间比较亦差异有统计学意义(P<0.05),治疗组(两合汤组)优于对照组。2)中医证候积分的变化,经过4周治疗后,2组与治疗前相比差异有统计学意义(P<0.05),治疗组优于对照组。治疗组治疗后入睡困难,多梦易醒等症状均得到明显改善。结果表明2组差异有统计学意义(P<0.05),说明治疗组对失眠的改善效果优于对照组。3)安全性评价:2组治疗过程中均无不良反应事件发生。表明两合汤安全性高。结论:两合汤对肝郁阴虚型不寐病临床效果良好且无不良反应,值得临床推广应用。展开更多
基金supported by China Geological Survey (Grant No. 1212010784007)
文摘In this paper, we report an integrated study of trace element, U-Pb age and Hf isotopic composition of zircons from alkali feldspar granites, granodiorites and diorite enclaves in a recently discovered ring complex at Lianghe in western Yunnan, Chi na. The granitoids showed identical U-Pb ages of 127, 115 and 122 Ma, from felsic to mafic, but had different zircon trace el ements and Hf isotopic compositions. Trace element content decreased with a gradual increase in εHf(t) values of ?9.1 to ?5.4, ?4.5 to 0, and 3.6 to 6.2, respectively. Results indicate that changes in zircon trace elements generally correlate with changes in Hf isotope signatures within single samples and among various granitoids. These relationships reflect the mixing of felsic and mafic magmas. Evidence indicates that depleted mantle-derived mafic magma underplating caused ancient crustal melting, and then formed large-scale granites in Lianghe during the Early Cretaceous. These granodiorites were formed mainly by the mix ing of mafic magma and granitic magma.
基金supported by China Geological Survey(Grant No. 1212010784007)
文摘In this paper,we report an integrated study of U-Pb age and Hf isotope compositions of zircons from biotite plagioclase gneiss at Lianghe in western Yunnan.The zircons preserved inherited core and rim texture.Igneous zircon grains and rims yielded a weighted mean ^（206）Pb/^（238）U age of 120.4±1.7 Ma,theirε_（Hf）（120 Ma）values were mainly negative ranging from-13.9 to-10.7,with Hf model ages between 1.9 Ga and 2.0 Ga,some zircons had positiveε_（Hf）（120 Ma）values ranging from 0.2 to 2.1.The inherited cores showed the wide variations in the U-Pb age of 375-1315 Ma.One of them showed theε_（Hf）（506 Ma）value of-4.2,it was similar to the gray gneiss of old crust,whichε_（Hf）（500 Ma） values were negative ranging from-4.5 to-3.3.Combining geological feature and geochemical data,we concluded that the protolith of biotite plagioclase gneiss was old crust-derived tonalitic magma during the early Cretaceous.
文摘目的:观察两合汤对肝郁阴虚型不寐病临床疗效。方法:将符合条件的42例肝郁阴虚型不寐病患者按照随机数字表法平均分为2组,每组21人。治疗组给予两合汤口服,对照组给予天王补心汤口服。经过4周的治疗,观察对照组和治疗组治疗前后的匹兹堡睡眠质量指数(Pittsburgh Sleep Quality Index score,PSQI)评分,中医症候评分变,不良反应发生情况和睡眠改善情况。疗程为4周。结果:1)匹兹堡睡眠质量指数(PSQI)的变化:经过4周治疗后,2组的PSQI总分较治疗前均有所下降。经过4周治疗,2组间的PSQI总分之间比较亦差异有统计学意义(P<0.05),治疗组(两合汤组)优于对照组。2)中医证候积分的变化,经过4周治疗后,2组与治疗前相比差异有统计学意义(P<0.05),治疗组优于对照组。治疗组治疗后入睡困难,多梦易醒等症状均得到明显改善。结果表明2组差异有统计学意义(P<0.05),说明治疗组对失眠的改善效果优于对照组。3)安全性评价:2组治疗过程中均无不良反应事件发生。表明两合汤安全性高。结论:两合汤对肝郁阴虚型不寐病临床效果良好且无不良反应,值得临床推广应用。
