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活动环
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     Activities
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     Annular Arch Removable Appliance
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     上的隐忧
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     太阳活动区冕若干研究进展
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The Lüliang orogeny (1.9-1.7?Ga) has long been thought to have been responsible for the cratonization of the North China craton (NCC). In fact, the NCC was dominated in the late Palaeoproterozoic by an extensional_tectonic regime, associated with the development of an aulacogen system, anorogenic magmatism (rapakivi granites, anorthosites, gabbros, granites and pegmatites), with the emplacement of large_scale mafic dyke swarms and with the uplift of the early metamorphic basement or the tectonothermal events...

The Lüliang orogeny (1.9-1.7?Ga) has long been thought to have been responsible for the cratonization of the North China craton (NCC). In fact, the NCC was dominated in the late Palaeoproterozoic by an extensional_tectonic regime, associated with the development of an aulacogen system, anorogenic magmatism (rapakivi granites, anorthosites, gabbros, granites and pegmatites), with the emplacement of large_scale mafic dyke swarms and with the uplift of the early metamorphic basement or the tectonothermal events of the retrogressive metamorphism. The statistical analysis of the known isotopic age data of the late Palaeoproterozoic to early Mesoproterozoic rocks suggests that several age peaks are revealed by the chronological distributions of the magmatic emplacement and basement tectonothermal events and that the uplift and retrogressive metamorphic events of the craton basement lagged behind the magmatic emplacement, distinctively different from the structural deformation_metamorphism_magmatic emplacement sequences characteristic of orogenic belts. The re_understanding of the late Palaeoproterozoic extensional tectonic framework clarifies the most basic restricting condition for the reconstruction of North China craton within Rodinia in the Mesoproterozoic.

吕梁运动 (1.90~ 1.70Ga)长久以来被认为是华北克拉通最终稳定固结的造山运动 .事实上 ,在古元古代末期华北克拉通以伸展 -裂解构造为主 ,表现为拗拉谷系发育、非造山岩浆活动 (环斑花岗岩、斜长岩、辉长岩、花岗岩类及伟晶岩脉等 )、大规模基性岩墙群侵位以及早期变质基底隆升或退变质构造热事件等 .对已有的大量同位素年代学资料分析后证明 ,这一时期的岩浆侵位与基底构造 -热事件在时间上的分布具有多峰式特点 ,克拉通基底隆升退变质事件滞后于岩浆侵位 ,明显区别于造山带普遍记录的构造变形 -变质 -岩浆侵位的事件序列 .古元古代末期构造格局的重新认识 ,为我国克拉通在元古代超大陆中的再造模式提供了最基本的制约条件 .

Spatiotemporal distribution of global great earthquakes in the past one hundred years represents two alternating periods:the circum-pacific period, and the almost-latitudinal period, which occurred by turns in the cycles of 10 to 20 years. Most of the seismic energy was released by the great thrust and normal earthquakes. The thrust earthquakes are mainly distributed on the circum-pacific seismic belt, the Himalaya collision boundary and the Sunda arc. The normal earthquakes occurred in the zones such as the...

Spatiotemporal distribution of global great earthquakes in the past one hundred years represents two alternating periods:the circum-pacific period, and the almost-latitudinal period, which occurred by turns in the cycles of 10 to 20 years. Most of the seismic energy was released by the great thrust and normal earthquakes. The thrust earthquakes are mainly distributed on the circum-pacific seismic belt, the Himalaya collision boundary and the Sunda arc. The normal earthquakes occurred in the zones such as the ocean ridge and the continental rift valleys. The distribution of strike-slip earthquakes shows an almost-latitudinal belt including the interior of eastern Asian continent, west boundary of North American plate, around Caribbean plate, southwest Pacific belt and some segments of Mediterranean-Himalayas belt. The ratio of poloidal to toroidal component of mantle convection determined the proportion of seismic energy released in the thrust, normal, or strike-slip earthquakes. The heterogeneous mantle motion affected the spatial distribution among the thrust, the normal and the strike-slip earthquakes. The poloidal component was involved in the thrust and normal earthquakes, while the toroidal component was affected to the strike-slip earthquakes. The temporal evolution of poloidal and toroidal components induced the alternation of the circum-pacific period and the almost-latitudinal period.

文中根据最新的全球大震资料划分了 10 0a来全球特大地震的时空演化过程 ,表现为环太平洋带与近纬向活动带两种强震分布图像 ,以 2 0a左右的时间段交替出现。逆冲和引张型地震释放了全球强震能量的主要部分。逆冲型地震主要发生在环太平洋地震带上 ,在喜马拉雅碰撞边界和巽他弧也有发生。引张型地震主要出现在洋脊和裂谷地区。而走滑型地震主要分布在东亚大陆内部、北美板块西边界和加勒比板块的周边、西南太平洋带、以及地中海 -喜马拉雅带部分区域 ,呈近纬向分布。地幔对流的垂直运动与水平运动分量的比率 ,决定了逆冲、引张与走滑型强震的能量释放份额。地幔运动在地表体现在逆冲、引张与走滑型强震空间分布的区域差异性。这种差异在时间上的演化形成了全球强震活动环太平带与近纬向分布图像的交替出现。

The active structures are developed in Lijiang area and tectonic earthquakes then are happened frequently. The line and ring structures on remote sensing images are interpreted in this paper, and then the characteristics of important active faults and rings in images, and the geologic and geomorphologic characteristics of the areas are all described. The areas that earthquake will be apt to happen are plotted out from the background.

丽江地区活动性构造发育,地震发生频繁。以遥感影像线环结构理论论述了该区主要活动断裂和活动环块的遥感影像特征和地质地貌特征,并分析活动构造与场地稳定性的关系,进而划分出该区内易发震地区与相对稳定的地区。

 
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