| 3 | An exotic Cretaceous kimberlite linked to metasomatized lithospheric mantle beneath the southwestern margin of the S?o Francisco Craton,Brazil显示文摘We present major and trace element compositions of mineral concentrates comprising garnet xenocrysts,ilmenite,phlogopite,spinel,zircon,and uncommon minerals(titanite,calzirtite,anatase,baddeleyite and pyrochlore)of a newly discovered Late Cretaceous kimberlite(U-Pb zircon age 90.0±1.3 Ma;2σ)named Osvaldo Franca 1,located in the Alto Paranaíba Igneous Province(APIP),southeastern Brazil.Pyrope grains are lherzolitic(Lherz-1,Lherz-2 and Lherz-3),harzburgitic(Harz-3)and wehrlitic(Wehr-2).The pyrope xenocrysts cover a wide mantle column in the subcratonic lithosphere(66–143 km;20–43 kbar)at relatively low temperatures(811–875°C).The shallowest part of this mantle is represented by Lherz-1 pyropes(20–32 kbar),which have low-Cr(Cr_(2)O_(3)=1.74–6.89 wt.%)and fractionated middle to heavy rare earth elements(MREE-HREE)pattern.The deepest samples are represented by Lherz-2,Lherz-3,Harz-3,and Wehr-2 pyropes(36–43 kbar).They contain high-Cr contents(Cr_(2)O_(3)=7.36–11.19 wt.%)and are characterized by sinusoidal(Lherz-2 and Wehr-2)and spoon-like(Lherz-3 and Harz-3)REE patterns.According to their REE and trace elements,pyrope xenocrysts have enriched nature(e.g.,Ce and Yb vs.Cr_(2)O_(3)),indicating that the cratonic lithosphere has been affected by a silicate melt with subalkaline/tholeiite composition due to their low Zr,Ti and Y concentrations.Besides minerals with typical kimberlitic signatures,such as ilmenite and zircon,the exotic compositions of phlogopite and ulvöspinel suggest an enriched component in the magma source.The formation of rare mineral phases with strong enrichment of light-REE(LREE)and high field strength elements(HFSE)is attributed to the late-stage kimberlitic melt.We propose a tectonic model where a thermal anomaly,represented by the low-velocity seismic anomaly observed in P-wave seismic tomography images,supplied heat to activate the alkaline magmatism from a metasomatized cratonic mantle source during the late-stages of Gondwana fragmentation and consequent South Atlantic Ocean opening.The metasomatism recorded by mineral phases is a product of long-lived recycling of subducted oceanic plates since the Neoproterozoic(Brasiliano Orogeny)or even older collisional events,contributing to the exotic character of the Osvaldo Fran?a 1 kimberlite,as well as to the cratonic lithospheric mantle. | Luísa D.V.Carvalho Tiago Jalowitzki Ricardo Scholz Guilherme O.Gonçalves Marcelo Peres Rocha Rogério Silvestre Pereira Cristiano Lana Marco Paulo de Castro Gláucia Queiroga Reinhardt A.Fuck | 2022 | Geoscience Frontiers2022，13，1： | 0 |
| 5 | Comparison of the systemic action of electroacupuncture and laserpuncture in experimental injuries on the back skin of Wistar rats(Rattus novergicus)显示文摘OBJECTIVE:To evaluate the systemic action of electroacupuncture and laserpuncture in the repair of excisional cutaneous injuries on the back of adult female Wistar rats.METHODS:Ninety animals were divided into three experimental groups:C-control;E-treated with electroacupuncture[acupoints:Feishu(BL13),Geshu(BL17),Zusanli(ST36)];L-treated with laserpuncture(same acupoints)and euthanized on the 7 th,14 th and 21 st days for tissue removal and preparation for histomorphometric and biochemical(dosages,zymography and Western blotting)analysis.RESULTS:The number of fibroblasts in the E and L groups presented higher values than the C on the14 th and 21 st days.The number of granulocytes was lower than C on the 21 st day in groups E and L.The total number of newly formed vessels increased on the 21 st day and was higher in both treatments when compared to C.The birefringent collagen fibers detected on the 21 st day was lower in groups E and L than group C.The glycosaminoglycans and hydroxyproline amount was similar among groups throughout the experimental period.The active isoform of matrixmetallo proteinase(MMP)-2 and the latent isoform of MMP-9 did not show any differences among all groups and experimental periods.The amount of collagenⅠpresented higher values in the L group on the 14 th day and in the E and L groups on the 21 st day.For typeⅢcollagen,groups E and L presented values lower than C in all experimental periods.The amount of transforming growth factor-β1 in the E and L groups showed higher amounts than C on the 7 th day and lower on the 14 th and 21 st days.For vascular endothelial growth factor,E and L groups presented similar and lower values than C on the 7 th and 14 th days,respectively,and similar on the 21 st day.CONCLUSION:The therapies evaluated in this article stimulated fibroblast proliferation,neoangiogenesis and altered the reorganization of collagen fibers in the repair of excisional injuries in female adult rats. | Ivens Takechi Nakagawa Hamilton Ricardo Alonso Fabrício Campos Kuroda JoséRoberto Passarini Junior Juan Guzman Quispe Cabanillas Fernanda Aparecida Sampaio Mendonça Gláucia Maria Tech dos Santos Andrea Aparecida de Aro Edson Rosa Pimentel Maria Esméria Corezola do Amaral Marcelo Augusto Marretto Esquisatto | 2021 | Journal of Traditional Chinese Medicine2021，41，5： | 0 |
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