Constraints for Kalaharis position in Rodinia as derived from detrital zircon studies in highgrade metasedimentary rocks from Dronning Maud Land, East Antartica

喀拉哈里板块的边缘是一个中元古代造山带，纳马夸-纳塔尔-莫德带，记录了高级变质作用和大陆之间的碰撞。1090和1060 Ma。东南极洲的德龙宁毛德地的主要部分是卡拉哈里板块的一部分，距今1000 Ma。最近有两个非常不同的喀拉哈里沙漠重建方案被提出。一种解释是喀拉哈里沙漠是劳伦蒂亚的一个缩进点，其他地方则是沿西澳大利亚沿着的喀拉哈里沙漠。在东劳伦蒂亚（格伦维尔造山带）和西澳大利亚，c. 1080 Ma的高品位岩石将符合与喀拉哈里在c. 1080 Ma.然而，无论是结构还是古地磁数据都不能明确地解决卡拉哈里是否与一个或另一个碰撞。在西澳大利亚州，只有一条非常狭窄的C带。1080 Ma老岩石被保存下来，平贾拉造山带，其中大部分可能被后来的裂谷肢解。因此，如果喀拉哈里曾经连接到西澳大利亚州，中元古界沉积岩在德龙宁毛德地接近任何新元古代缝合带在德龙宁毛德地应表明一个典型的澳大利亚锆石年龄人口。因此，在本项目中，将对德龙宁毛德地变质沉积岩中的碎屑岩进行测年，以测试卡拉哈里是否与西澳大利亚的劳伦蒂亚碰撞，或者两者都没有。

The Kalahari plate is rimmed by a Mesoproterozoic orogenic belt, the Namaqua-Natal-Maud Belt, that documents high-grade metamorphism and continent-continent collision between c. 1090 and 1060 Ma. A major part of Dronning Maud Land in East Antarctica is part of the Kalahari plate at 1000 Ma. Two very different reconstructions for Kalahari have recently been proposed. One interprets Kalahari as an indenter into Laurentia, the other places Kalahari along Western Australia. Both, in eastern Laurentia (the Grenville Orogen) and in Western Australia, the occurrence of c. 1080 Ma high-grate rocks would conform with a continent-continent collision with Kalahari at c. 1080 Ma. However, neither structural nor paleomagnetic data unequivocally resolve whether Kalahari collided with one or the other. In Western Australia, only a very narrow strip of c. 1080 Ma old rocks is preserved, the Pinjarra Orogen, the major portion of which probably dismembered by later rifting. Thus, if Kalahari was ever attached to Western Australia, Mesoproterozoic sedimentary rocks in Dronning Maud Land close to any Neoproterozoic suture zone in Dronning Maud Land shoud indicate a typical Australian zircon age population. In this project therefore, detrital zirkons from metasedimentary rocks in Dronning Maud Land will be dated in order to test whether Kalahari collided with Laurentia, Western Australia or neither of these.