A-type granites induced by a breaking-off and delamination of the subducted Junggar oceanic plate,West Junggar,Northwest China

The A-type granites with highly positiveε_(Nd)(t)values in the West Junggar,Central Asian Orogenic Belt(CAOB),have long been perceived as a group formed under the same tectonic and geodynamic setting,magmatic sourceq and petrogenetic model.Geological evidence shows that these granites occurred at two different tectonic units related to the southeastern subduction of Junggar oceanic plate:the Hongshan and Karamay granites emplaced in the southeast of West Junggar in the Baogutu continental arc;whereas the Akebasitao and Miaoergou granites formed in the accretionary prism.Here the authors present new bulk-rock geochemistry and Sr-Nd isotopes,zircon U-Pb ages and Hf-O isotopes data on these granites.The granites in the Baogutu continental arc and accretionary prism contain similar zirconε_(Hf)(t)values(+10.9 to+16.2)and bulk-rock geochemical characteristics(high SiO_(2)and K_(2)O contents,enriched LILEs(except Sr),depleted Sr,Ta and Ti,and negative anomalies in Ce and Eu).The Hongshan and Karamay granites in the Baogutu continental arc have older zircon U-Pb ages(315-305 Ma)and moderate^(18)O enrichments(δ^(18)_(O_(zircon))=+6.41‰-+7.96‰);whereas the Akebasitao and Miaoergou granites in the accretionary prism have younger zircon U-Pb ages(305-301 Ma)with higher^(18)O enrichments(δ^(18)_(O_(zircon))=+8.72‰-+9.89‰).The authors deduce that the elevated^(18)O enrichments of the Akebasitao and Miaoergou granites were probably inherited from low-temperature altered oceanic crusts.The Akebasitao and Miaoergou granites were originated from partial melting of low-temperature altered oceanic crusts with juvenile oceanic sediments below the accretionary prism.The Hongshan and Karamay granites were mainly derived from partial melting of basaltic juvenile lower crust with mixtures of potentially chemical weathered ancient crustal residues and mantle basaltic melt(induced by hot intruding mantle basaltic magma at the bottom of the Baogutu continental arc).On the other hand,the Miaoergou charnockite might be sourced from a deeper partial melting reservoir under the accretionary prism,consisting of the low-temperature altered oceanic crust,juvenile oceanic sediments,and mantle basaltic melt.These granites could be related to the asthenosphere's counterflow and upwelling,caused by the break-off and delamination of the subducted oceanic plate beneath the accretionary prism Baogutu continental arc in a post-collisional tectonic setting.

Report of 2.7 Ga zircon U-Pb age of orthogneiss in the Wenquan metamorphic complex,West Tianshan,China

1.Objective The Wenquan Group is one of the important medium-to low-grade metamorphic units within the Wenquan metamorphic complexes which distributes in Chinese segment of the Tianshan Belt,the southern part of the Central Asian Orogenic Belt.It mainly consists of pre-Neoproterozoic metamorphosed volcanic and sedimentary rocks(Wang B et al.,2014).

Clinical observation on the effect of acupuncture and moxibustion combined with rehabilitation training on post-stroke shoulder hand syndrome

Objective:To compare the clinical effects of body acupuncture,moxibustion,and body acupuncture plus moxibustion in the treatment of post-stroke shoulder hand syndrome(SHS).Methods:A total of 90 SHS patients after stroke were randomly divided into the body acupuncture group,the moxibustion group,and the body acupuncture plus moxibustion group,with 30 cases in each.On the basis of rehabilitation and routine treatment,the patients in different groups were treated with body acupuncture,moxibustion,and body acupuncture plus moxibustion respectively.Treatment was given once a day,5 times a week,and 4 weeks in all.The visual analogue scale(VAS)scores,edema grading scores,and simplified Fugl-Meyer assessment(FMA)scores were evaluated before and after treatment,and the therapeutic effects of patients were evaluated as well.Results:After treatment,the VAS and edema grading scores of the three groups were all lower and the FMA scores were all higher than those before treatment,with statistically significant differences(all P<0.05).The VAS and edema grading scores of the acupuncture plus moxibustion group were lower and the FMA score was higher than those of the body acupuncture group and the moxibustion group,with statistically significant differences(all P<0.05).The total effective rate of the acupuncture plus moxibustion group was 96.7%,higher than 80.0%of the body acupuncture group and 83.3%of the moxibustion group,with statistically significant differences(both P<0.05).Conclusion:Body acupuncture,moxibustion,and body acupuncture plus moxibustion are all effective for post-stroke SHS,while the effect of acupuncture plus moxibustion is the best in relieving the pain and swelling,and improving effectively the joint movement of post-stroke SHS patients,which should be popularized in clinical practice.