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首页> 外文期刊>Geological Magazine >The structural evolution of the Straumsnutane and western Sverdrupfjella areas, western Dronning Maud Land, Antarctica: implications for the amalgamation of Gondwana
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The structural evolution of the Straumsnutane and western Sverdrupfjella areas, western Dronning Maud Land, Antarctica: implications for the amalgamation of Gondwana

机译：鲟鱼和西方Sverdrupfjella地区的结构演变，西方德国武器陆地，南极洲：对吉隆坡融合的影响

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The study area is located across the Kalahari Craton - Maud Belt boundary in Dronning Maud Land (DML), Antarctica. The similar to 1100 Ma Maud Belt in the east is situated where the similar to 900-600 Ma East African and similar to 530-500 Ma Kuunga orogenies overlap. The Kalahari Craton cover in the west of the study area comprises similar to 1100 Ma Straumsnutane Formation lavas in Straumsnutane. In Straumsnutane, early similar to 1100 Ma low-grade structures suggest top-to-the-NW deformation. Younger similar to 525 Ma structures suggest conjugate top-to-ESE and -WNW transport under low-grade conditions. Western Straumsnutane and Ahlmannryggen do not show the same complex deformation, the intense deformation being restricted to NE Straumsnutane along the eastern margin of the Kalahari Craton. In Sverdrupfjella, in the east, the Maud Belt is underlain by medium-grade, deformed similar to 1140 Ma supracrustal gneisses and younger intrusions. Four deformation phases in the gneisses comprise D-1+ D(2)with top-to-the-N and -NW folds, D(3)top-to-the-S and -SE folding and D(4)brittle faulting. Syn-D(3)emplacement of granitoid veins is inferred at similar to 490 Ma. Comparison of the deformation vergence of NE Straumsnutane with western Sverdrupfjella suggests D(1)in Straumsnutane is correlatable with D-1+ D(2)Mesoproterozoic structures in western Sverdrupfjella. D(2)deformation in Straumsnutane can be correlated with D(3)structures and Cambrian-age granites in Sverdrupfjella. D(2)deformation in eastern Straumsnutane and D(3)in western Sverdrupfjella are inferred to have occurred in a mega-nappe footwall, implying the Ritscherflya Supergroup cratonic cover in eastern Straumsnutane was partially submerged in the footwall, the mega-nappe formed during Gondwana amalgamation, involving collision between N and S Gondwana in the Kuunga Orogeny, similar to 530-500 Ma ago.
机译：研究区位于卡拉哈里·克拉顿 - Maud皮带边界，在南极洲德国德国土地（DML）。类似于1100马的Maud皮带，位于与900-600马东非相似，类似于530-500 MA Kuunga Orgenies重叠。该研究区西部的Kalahari Craton封面包括刺腹部1100 mA硫霉菌形成熔岩。在溢霉中，早期类似于1100 mA低级结构，表明了顶到-NW变形。年轻人与525 mA结构相似，建议在低级条件下共轭顶到-ESE和-WNW运输。西风肿大和阿尔曼里格根本没有表现出相同的复杂变形，强烈变形被限制在沿着卡拉哈里·克拉顿东部的牛鲟。在东部的Sverdrupfjella，Maud皮带受到中等级的下层，变形类似于1140 ma Supractal的片状和较年轻的入侵。单根茎中的四个变形阶段包括D-1 + D（2），顶部到N-N和-NW折叠，D（3）顶部到-S-S和-SE折叠和D（4）脆性断层。在类似于490 mA的情况下推断出花岗岩静脉的Syn-D（3）施加。 Ne Straumsnutane与西方Sverdrupfjella的变形血液的比较表明D-1 + D（2）中西部Sverdrupfjella中的D-1 + D（2）Mesoproterozoic结构是可言选的。 D（2）鼻塞中的变形可以与Sverdrupfjella的D（3）结构和寒武纪时代花岗岩相关。 D（2）在西尔德鲁氏菌的东溢霉（3）中的变形被推断出在兆纳皮脚壁中发生，暗示了东刺霉素中的Ritscherflya超级胶质组粘液覆盖部分浸没在脚壁中，Mega-Nappe在内部形成Gondwana合并，涉及在Kuanga Orogeny的N和S Gondwana之间的碰撞，类似于530-500 ma前。

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