A segment of Mesozoic subduction-accretion zone was inferred across thenortheastern South China Sea at approximately NE450 orientation. Basic evidence includes thefollowing: A belt of peek gross horizontal Bouguer gra...A segment of Mesozoic subduction-accretion zone was inferred across thenortheastern South China Sea at approximately NE450 orientation. Basic evidence includes thefollowing: A belt of peek gross horizontal Bouguer gravity gradient (PGHGBA) is comparable in sizeand intensity to that of the Manila subduction-accretion zone. A belt of high positive magneticanomalies appears to the north and sub-parallel to the PGHGBA, representing the volcanic arcassociated to the subduction zone. The PGHGBA crosses obliquely both Cenozoic structures and presentseafloor topography, indicating a pre-Cenozoic age. The segment is offset left-laterally byNW-running strike-slip faults, in concord with the Mesozoic stress field of South China. Inaddition, the existence of the subduction zone is supported by wide-angle seismic data obtained indifferent years by different institutions. At approximate localities, a north-dipping ramp of Mohosurface is indicated by records of ocean-bottom seismometers, and a strong reflector about 8 kmbeneath the Moho reflector is indicated by both OBS and long-cable seismic records. Theidentification of a segment of Mesozoic subduction zone in NE South China Sea fills nicely the gapof the Great Late Mesozoic Circum SE Asia Subduction-acrretion Zone, which extended from Sumatra,Java, SE Kalimantan to N Palawan, and from Taiwan, Ryukyu to SW Japan.展开更多
Mesozoic bimodal volcanic rocks of basaltic andesite and rhyolite are widely distributed in the Da Hinggan Range, but their petrogenetic relationships and geodynamic implications are rarely constrained. Detailed studi...Mesozoic bimodal volcanic rocks of basaltic andesite and rhyolite are widely distributed in the Da Hinggan Range, but their petrogenetic relationships and geodynamic implications are rarely constrained. Detailed studies on doleritic and porphyry dikes in the Zhalantun area indicate that they display features of magma mixing, suggesting their coeval formation. In situ zircon U-Pb dating shows that the porphyry was emplaced in the Early Cretaceous with a ^206Pb/^238U age of 130±1 Ma. Zircons from the dolerite also yield an Early Cretaceous emplacement age of 124±2 Ma although some inherited zircons have been identified. These age results indicate that the Early Cretaceous was an important period of magmatism in the Da Hinggan Range. Zircons from porphyry are characterized by positive value of εHf（t） as high as 10.3±0.5 with Hf depleted mantle model age of 349-568 Ma, whereas magmatic zircons from the dolerite have εHf（t） value of 11.0±1.4 with Hf depleted mantel model age of 342-657 Ma, consistent with those from the porphyry. Considering other data on the geological evolution of this area, it is concluded that the mafic magma originated from the partial melting of Paleozoic enriched lithospheric mantle, whereas the felsic magma came from recycling of juvenile crust formed during the Paleozoic. Both of the protoliths are closely related to the subduction of the Paleo-Asian Ocean during the Paleozoic, indicating that the Paleozoic is an important period of large-scale crustal growth in the area.展开更多
The basement of the Songliao Basin is mainly composed of slightly-metamorphosed or unmetamorphosed Paleozoic strata, granites and gneiss. Petrographical studies indicate that the gneiss was originally the granitic int...The basement of the Songliao Basin is mainly composed of slightly-metamorphosed or unmetamorphosed Paleozoic strata, granites and gneiss. Petrographical studies indicate that the gneiss was originally the granitic intrusions which were deformed in the later stage. One undeformed granitic rock sample gives a U-Pb age of (305+++++++++++2) Ma, and the mylonitic granite yields a U-Pb age of (165++++++++3) Ma. Both of the two samples contain no inherited zircon, which suggests that there is no large-scale Precambrian crystalline basement beneath the Songliao Basin.展开更多
目的探讨解郁汤联合电针百会、四神聪对脑梗死后抑郁焦虑患者的临床疗效及对神经功能的影响。方法将2016年4月—2018年3月医院收治的86例脑梗死后抑郁焦虑患者,随机分两组,为对照组和治疗组,各43例,对照组采用氟西汀胶囊(20 mg/次,1次/d...目的探讨解郁汤联合电针百会、四神聪对脑梗死后抑郁焦虑患者的临床疗效及对神经功能的影响。方法将2016年4月—2018年3月医院收治的86例脑梗死后抑郁焦虑患者,随机分两组,为对照组和治疗组,各43例,对照组采用氟西汀胶囊(20 mg/次,1次/d)治疗,观察组采用解郁汤联合电针百会、四神聪治疗,持续治疗8周。比较两组患者的临床疗效,治疗前、治疗4周、治疗8周时记录汉密尔顿焦虑量表(Hamilton Anxiety Scale,HAMA)、24项汉密尔顿抑郁量表(Hamilton Depression Scale,HAMD)、神经功能缺损程度(National Institute of Health stroke scale,NIHSS)评分和5-羟色胺(5-hydroxytryptamine,5-HT)、去甲肾上腺素(Norepinephrine,NE)。结果对照组有效率81.40%(35/43)低于观察组95.35%(41/43),差异具有统计学意义(P<0.05)。与治疗前比,两组患者治疗4周、治疗8周时HAMA评分、HAMD评分及NIHSS评分降低;与对照组比,观察组患者治疗4周、治疗8周时HAMA评分、HAMD评分及NIHSS评分较低,差异具有统计学意义(P<0.05)。与治疗前比,两组患者治疗4周、治疗8周时血清5-HT和NE含量升高;与对照组比,观察组患者治疗4周、治疗8周时血清5-HT和NE含量较高,差异具有统计学意义(P<0.05)。对照组不良率18.60%(8/43)与观察组20.93%(9/43)比较,差异无统计学意义(P>0.05)。结论解郁汤联合电针百会、四神聪对脑梗死后抑郁焦虑患者的临床疗效确切,可改善焦虑、抑郁及神经缺损表现,提高血5-HT和NE水平,安全性高,是一种安全有效的治疗方案。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.40238060)the National Basic Research Program of China(Grant No.G20000467-02)+1 种基金the Key Project of the Chinese Academy of Sciences(Grant No.KZCX2-SW-117)the National Special Project(Grant No.2001DIA50041).
文摘A segment of Mesozoic subduction-accretion zone was inferred across thenortheastern South China Sea at approximately NE450 orientation. Basic evidence includes thefollowing: A belt of peek gross horizontal Bouguer gravity gradient (PGHGBA) is comparable in sizeand intensity to that of the Manila subduction-accretion zone. A belt of high positive magneticanomalies appears to the north and sub-parallel to the PGHGBA, representing the volcanic arcassociated to the subduction zone. The PGHGBA crosses obliquely both Cenozoic structures and presentseafloor topography, indicating a pre-Cenozoic age. The segment is offset left-laterally byNW-running strike-slip faults, in concord with the Mesozoic stress field of South China. Inaddition, the existence of the subduction zone is supported by wide-angle seismic data obtained indifferent years by different institutions. At approximate localities, a north-dipping ramp of Mohosurface is indicated by records of ocean-bottom seismometers, and a strong reflector about 8 kmbeneath the Moho reflector is indicated by both OBS and long-cable seismic records. Theidentification of a segment of Mesozoic subduction zone in NE South China Sea fills nicely the gapof the Great Late Mesozoic Circum SE Asia Subduction-acrretion Zone, which extended from Sumatra,Java, SE Kalimantan to N Palawan, and from Taiwan, Ryukyu to SW Japan.
基金This work was financially suppo.rted by the National Natural Science Foundation of China （No. 40372038 and No. 40325006） Special Grant of 0il ＆ Gas Research （XQ-2004-07）.
文摘Mesozoic bimodal volcanic rocks of basaltic andesite and rhyolite are widely distributed in the Da Hinggan Range, but their petrogenetic relationships and geodynamic implications are rarely constrained. Detailed studies on doleritic and porphyry dikes in the Zhalantun area indicate that they display features of magma mixing, suggesting their coeval formation. In situ zircon U-Pb dating shows that the porphyry was emplaced in the Early Cretaceous with a ^206Pb/^238U age of 130±1 Ma. Zircons from the dolerite also yield an Early Cretaceous emplacement age of 124±2 Ma although some inherited zircons have been identified. These age results indicate that the Early Cretaceous was an important period of magmatism in the Da Hinggan Range. Zircons from porphyry are characterized by positive value of εHf（t） as high as 10.3±0.5 with Hf depleted mantle model age of 349-568 Ma, whereas magmatic zircons from the dolerite have εHf（t） value of 11.0±1.4 with Hf depleted mantel model age of 342-657 Ma, consistent with those from the porphyry. Considering other data on the geological evolution of this area, it is concluded that the mafic magma originated from the partial melting of Paleozoic enriched lithospheric mantle, whereas the felsic magma came from recycling of juvenile crust formed during the Paleozoic. Both of the protoliths are closely related to the subduction of the Paleo-Asian Ocean during the Paleozoic, indicating that the Paleozoic is an important period of large-scale crustal growth in the area.
文摘The basement of the Songliao Basin is mainly composed of slightly-metamorphosed or unmetamorphosed Paleozoic strata, granites and gneiss. Petrographical studies indicate that the gneiss was originally the granitic intrusions which were deformed in the later stage. One undeformed granitic rock sample gives a U-Pb age of (305+++++++++++2) Ma, and the mylonitic granite yields a U-Pb age of (165++++++++3) Ma. Both of the two samples contain no inherited zircon, which suggests that there is no large-scale Precambrian crystalline basement beneath the Songliao Basin.
文摘目的探讨解郁汤联合电针百会、四神聪对脑梗死后抑郁焦虑患者的临床疗效及对神经功能的影响。方法将2016年4月—2018年3月医院收治的86例脑梗死后抑郁焦虑患者,随机分两组,为对照组和治疗组,各43例,对照组采用氟西汀胶囊(20 mg/次,1次/d)治疗,观察组采用解郁汤联合电针百会、四神聪治疗,持续治疗8周。比较两组患者的临床疗效,治疗前、治疗4周、治疗8周时记录汉密尔顿焦虑量表(Hamilton Anxiety Scale,HAMA)、24项汉密尔顿抑郁量表(Hamilton Depression Scale,HAMD)、神经功能缺损程度(National Institute of Health stroke scale,NIHSS)评分和5-羟色胺(5-hydroxytryptamine,5-HT)、去甲肾上腺素(Norepinephrine,NE)。结果对照组有效率81.40%(35/43)低于观察组95.35%(41/43),差异具有统计学意义(P<0.05)。与治疗前比,两组患者治疗4周、治疗8周时HAMA评分、HAMD评分及NIHSS评分降低;与对照组比,观察组患者治疗4周、治疗8周时HAMA评分、HAMD评分及NIHSS评分较低,差异具有统计学意义(P<0.05)。与治疗前比,两组患者治疗4周、治疗8周时血清5-HT和NE含量升高;与对照组比,观察组患者治疗4周、治疗8周时血清5-HT和NE含量较高,差异具有统计学意义(P<0.05)。对照组不良率18.60%(8/43)与观察组20.93%(9/43)比较,差异无统计学意义(P>0.05)。结论解郁汤联合电针百会、四神聪对脑梗死后抑郁焦虑患者的临床疗效确切,可改善焦虑、抑郁及神经缺损表现,提高血5-HT和NE水平,安全性高,是一种安全有效的治疗方案。
