The Qinling orogenic belt is a collision zone between the North China and Yangtze cratons. The Qinling Complex is a Precambrian metamorphic complex, developed in the inner zone of the orogenic belt , which records the...The Qinling orogenic belt is a collision zone between the North China and Yangtze cratons. The Qinling Complex is a Precambrian metamorphic complex, developed in the inner zone of the orogenic belt , which records the metamorphic and deformational history and PTt path of the regional meta-morphism of the collision zone . The present paper studies the metamorphic and deformational history and the PTt path of various tectono-metamorphic cycles in order to describe the geodynamic processes prevailing in that part of the Qinling orogenic belt since Proterozoic.The tectonometamorphic history and evolution of the Qinling Complex is divided into two stages: the stage of formation and the stage of modification During the stage of formation dated as Proterozoic,three deformational sequences are recognized. The amphibolite facies regional metamorphism is earlier than or synchronous with the first or second phase of folding. Three metamorphic zones, i.e. And-Ms ,Sil- Ms, Sil Kfs are delimited. During the stage of modification , the emplacement of Caledonian granite , superimposed thermal aureole (garnet K feldspar zone )and the development of ductile shear zones are major events.Metamorphic reactions are reconstructed in terms of analysis of re-equilibrium textures. Geothermobarometric calculations are conducted to calibrate the PT conditions of metamorphism .The metamorphic PTt paths have been estabh'shed. The PTt path of the Proterozoic tectonometamorphic cycle shows a clockwise pattern and is characterized by prominent decompression. The PTt path of the Caledonian tectonometamorphic cycle is characterized first by PT rising ,then isothermal decompression (rapid uplift), and finally by isobaric cooling The PTt path of the two tectonometamorphic cycles evidence the geodynamic processes: two major stages of collision and uplift in the Proterozoic and Caledonian Hercynian periods, respectively, during the evolution of Qinling orogenic belt.展开更多
目的研究凋亡抑制蛋白Survivin及环氧合酶2(COX-2)在良、恶性多形性腺瘤中的表达及意义。方法采用免疫组织化学显色法检测Survivin与COX-2分别在20例腮腺正常组织、24例腮腺良性多形性腺瘤(PA)和22例恶性腮腺多形性腺瘤(ca ex PA)的阳...目的研究凋亡抑制蛋白Survivin及环氧合酶2(COX-2)在良、恶性多形性腺瘤中的表达及意义。方法采用免疫组织化学显色法检测Survivin与COX-2分别在20例腮腺正常组织、24例腮腺良性多形性腺瘤(PA)和22例恶性腮腺多形性腺瘤(ca ex PA)的阳性表达情况。结果①Survivin在正常腮腺组织组、腮腺多形性腺瘤组和恶性多形性腺瘤病组中的阳性表达率分别为:5%、58.8%和95.5%,各组之间有显著差异。②COX-2阳性表达率分别为55%、79.2%和90.9%,三组间差异具有统计学的意义(P<0.05)。结论 Survivin及COX-2两因子在恶性多形性腺瘤组织中过度表达,提示其与腮腺良、恶性多形性腺瘤的发生、发展有一定相关性,对于腮腺多形性腺瘤良、恶性的诊断具有一定的临床意义。展开更多
文摘The Qinling orogenic belt is a collision zone between the North China and Yangtze cratons. The Qinling Complex is a Precambrian metamorphic complex, developed in the inner zone of the orogenic belt , which records the metamorphic and deformational history and PTt path of the regional meta-morphism of the collision zone . The present paper studies the metamorphic and deformational history and the PTt path of various tectono-metamorphic cycles in order to describe the geodynamic processes prevailing in that part of the Qinling orogenic belt since Proterozoic.The tectonometamorphic history and evolution of the Qinling Complex is divided into two stages: the stage of formation and the stage of modification During the stage of formation dated as Proterozoic,three deformational sequences are recognized. The amphibolite facies regional metamorphism is earlier than or synchronous with the first or second phase of folding. Three metamorphic zones, i.e. And-Ms ,Sil- Ms, Sil Kfs are delimited. During the stage of modification , the emplacement of Caledonian granite , superimposed thermal aureole (garnet K feldspar zone )and the development of ductile shear zones are major events.Metamorphic reactions are reconstructed in terms of analysis of re-equilibrium textures. Geothermobarometric calculations are conducted to calibrate the PT conditions of metamorphism .The metamorphic PTt paths have been estabh'shed. The PTt path of the Proterozoic tectonometamorphic cycle shows a clockwise pattern and is characterized by prominent decompression. The PTt path of the Caledonian tectonometamorphic cycle is characterized first by PT rising ,then isothermal decompression (rapid uplift), and finally by isobaric cooling The PTt path of the two tectonometamorphic cycles evidence the geodynamic processes: two major stages of collision and uplift in the Proterozoic and Caledonian Hercynian periods, respectively, during the evolution of Qinling orogenic belt.
文摘目的研究凋亡抑制蛋白Survivin及环氧合酶2(COX-2)在良、恶性多形性腺瘤中的表达及意义。方法采用免疫组织化学显色法检测Survivin与COX-2分别在20例腮腺正常组织、24例腮腺良性多形性腺瘤(PA)和22例恶性腮腺多形性腺瘤(ca ex PA)的阳性表达情况。结果①Survivin在正常腮腺组织组、腮腺多形性腺瘤组和恶性多形性腺瘤病组中的阳性表达率分别为:5%、58.8%和95.5%,各组之间有显著差异。②COX-2阳性表达率分别为55%、79.2%和90.9%,三组间差异具有统计学的意义(P<0.05)。结论 Survivin及COX-2两因子在恶性多形性腺瘤组织中过度表达,提示其与腮腺良、恶性多形性腺瘤的发生、发展有一定相关性,对于腮腺多形性腺瘤良、恶性的诊断具有一定的临床意义。
