Paleomagnetism of Paleozoic sedimentary rocks from the Karatau Range, Southern Kazakhstan: Multiple remagnetization events correlate with phases of deformation

Paleomagnetism of Paleozoic sedimentary rocks from the Karatau Range, Southern Kazakhstan: Multiple remagnetization events correlate with phases of deformation
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哈萨克斯坦南部卡拉套山脉古生代沉积岩的古磁性:多次重磁化事件与变形阶段相关

DOI:
10.1002/jgrb.50253
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发表时间:
2013
期刊:
Journal of Geophysical Research: Solid Earth
影响因子:
--
通讯作者:
Bachtadse
Bachtadse
中科院分区:
--
文献类型:
--
作者:
Kirscher;Alexeiev;Echtler;Bachtadse

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在欧亚大陆最终碰撞和融合期间,阿尔泰山脉的古地理及其运动学和构造演化仍然鲜为人知。针对这一问题,对哈萨克斯坦南部卡拉陶地区的古生代沉积岩进行了古地磁研究。逐步热退磁揭示了在大多数样品中存在磁化的高温成分。褶皱测试表明,在所研究的五个地区中,有三个地区的剩磁采集处于同步褶皱年龄。泥盆纪和二叠纪岩石的定向数据产生了正褶皱测试,暗示了原始磁化作用。由此产生的二叠纪和泥盆纪岩石的前褶皱古纬度表明,在那个时期,卡拉托与波罗的海很接近。同步性和褶皱后磁化作用导致卡拉托古纬度,有时与基于波罗的海视极漂移路径(APWP)的古纬度曲线相交,分别与约280 Ma、~260 Ma和~230 Ma的主要变形事件相对应。我们用伴随形变的复杂的再磁化事件模式来解释这一现象,其中可能包括同向折叠的再磁化事件和原始磁信号的区域。此外,基于波罗的海APWP的参考偏角与观测到的偏角之间的差异表明,卡拉托在晚古生代至早中生代期间连续逆时针旋转重组,最大旋转值相对于波罗的海约65°。重新磁化事件与乌拉尔山脉造山演化的最新陆内阶段相关,从而与欧亚大陆的古生代拼合有关,表明乌拉尔和卡拉托山脉的同步和连贯的构造演化。
The paleogeography of the Altaids and its kinematic and tectonic evolution during the final collision and amalgamation of Eurasia is still poorly known. Addressing this problem, a paleomagnetic study has been undertaken on Paleozoic sedimentary rocks from the Karatau, Southern Kazakhstan. Stepwise thermal demagnetization reveals the presence of a high‐temperature component of magnetization in most samples. Fold tests indicate a syn‐folding age of magnetic remanence acquisition at three of the five areas studied. Directional data of Devonian and Permian rocks yield a positive fold test, implying a primary magnetization. Resulting prefolding paleolatitudes for Permian and Devonian rocks show the proximity of the Karatau to Baltica during those times. Syn‐ and post‐folding magnetizations result in paleolatitudes for Karatau, which intersect the paleolatitude curve based on the Baltica apparent polar wander path (APWP), at times, which can be correlated to major deformational events at ~280 Ma, ~260 Ma, and ~230 Ma, respectively. We interpret this with complicated pattern of remagnetization events accompanying deformation, which can include syn‐folding remagnetization events and areas of primary magnetic signals. Additionally, the differences between reference declinations based on the APWP for Baltica and observed declinations suggest successive counterclockwise rotational reorganization of the Karatau during the late Paleozoic to Early Mesozoic, with maximal rotation values of ~65° with respect to Baltica. The remagnetization events are correlated with latest intracontinental stages of orogenic evolution in the Ural mountains and thus the Paleozoic amalgamation of the Eurasian continent and suggest synchronous and coherent tectonic evolution in the Urals and Karatau mountains.
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