The Main Shear Zone in Sør Rondane, East Antarctica: Implications for the late‐Pan‐African tectonic evolution of Dronning Maud Land
The Main Shear Zone in Sør Rondane, East Antarctica: Implications for the late‐Pan‐African tectonic evolution of Dronning Maud Land
复制标题
东南极洲 Sår Rondane 的主剪切带：对 Dronning Maud 地泛非晚期构造演化的影响
作者：
Ruppel;Läufer;Jacobs;Elburg;Krohne;Damaske;Lisker
在东南极洲Sør Rondane西部和Dronning Maud Land （DML）东部的构造研究为东南极洲的构造演化提供了新的认识。主要构造特征之一是长约120公里，宽约数百米的WSW - ENE向主剪切带（MSZ）。其特征是角闪岩峰相条件下的右向高应变韧性变形。与岩浆岩年代的横切关系表明，MSZ在晚埃迪卡拉纪至寒武纪（约560至530 Ma）之间的活动。MSZ将北部具有“东非”特征的泛非绿片岩-麻粒岩相变质岩与南部具有“印度-南极”特征的雷纳时代早期新元古代辉长岩-闪长岩-闪长岩-花岗闪长岩杂岩分开。它被解释为在靠近东非-南极造山带（EAAO）东部边缘的位置代表了一个重要的岩石构造走滑边界，该位置被认为位于冰盖地区的更南部。与DML中部可能同时存在的左向南Orvin剪切带一起，MSZ可能与EAAO的NE向侧向逸出有关，而DML西部的hemefront剪切带和South Kirwanveggen剪切带则是该双侧系统的南向分支。
Structural investigations in western Sør Rondane, eastern Dronning Maud Land (DML), provide new insights into the tectonic evolution of East Antarctica. One of the main structural features is the approximately 120 km long and several hundred meters wide WSW‐ENE trending Main Shear Zone (MSZ). It is characterized by dextral high‐strain ductile deformation under peak amphibolite‐facies conditions. Crosscutting relationships with dated magmatic rocks bracket the activity of the MSZ between late Ediacaran to Cambrian times (circa 560 to 530 Ma). The MSZ separates Pan‐African greenschist‐ to granulite‐facies metamorphic rocks with “East African” affinities in the north from a Rayner‐age early Neoproterozoic gabbro‐tonalite‐trondhjemite‐granodiorite complex with “Indo‐Antarctic” affinities in the south. It is interpreted to represent an important lithotectonic strike‐slip boundary at a position close to the eastern margin of the East African‐Antarctic Orogen (EAAO), which is assumed to be located farther south in the ice‐covered region. Together with the possibly coeval left‐lateral South Orvin Shear Zone in central DML, the MSZ may be related to NE directed lateral escape of the EAAO, whereas the Heimefront Shear Zone and South Kirwanveggen Shear Zone of western DML are part of the south directed branch of this bilateral system.
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影响因子：
1.8
作者：
Golynsky, A;Jacobs, J
通讯作者：
Jacobs, J
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DOI：
10.1007/bf02440112
发表时间：
1996
期刊：
Geologische Rundschau
影响因子：
--
作者：
J. Jacobs;W. Bauer;G. Spaeth;R. J. Thomas;K. Weber
通讯作者：
K. Weber
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DOI：
10.1144/gsl.sp.2003.206.01.13
发表时间：
2003
期刊：
Geological Society, London, Special Publications
影响因子：
--
作者：
W. Bauer;R. Thomas;J. Jacobs
通讯作者：
J. Jacobs
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影响因子：
2.7
作者：
A. Moyes;J. M. Barton;P. Groenewald
通讯作者：
P. Groenewald
影响因子：
3.8
作者：
H. Marschall;C. Hawkesworth;P. Leat
通讯作者：
H. Marschall;C. Hawkesworth;P. Leat