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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >New paleomagnetic results for Ordovician and Silurian rocks of the Tarim Block, Northwest China and their paleogeographic implications
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New paleomagnetic results for Ordovician and Silurian rocks of the Tarim Block, Northwest China and their paleogeographic implications

机译：奥莫瓦伊古代古代古代古代岩石岩石，中国西北地区及其古地理影响

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摘要

The kinematics of the Tarim Block is poorly understood prior to the late Paleozoic and this study aims to clarify motions during Ordovician and Silurian times. We report the paleomagnetic record from 12 sites in Ordovician marine sediments and 21 sites in Silurian fine-grained sandstones and mudstones from the Aksu and Kalpin areas of northwestern Tarim. Together with our previously reported preliminary results, the Ordovician sediments isolate a sporadically-preserved pre-Cenozoic characteristic remanence with dual polarity. Although a positive fold test can only define the remanence as pre-Cenozoic, the corresponding paleomagnetic pole (33.7 degrees S, 185.0 degrees E, dp/dm = 2.7 degrees/4.0 degrees) is removed from post-Silurian paleopoles from Tarim and combined with evidence from magnetic fabrics indicating a quasi-primary origin. A characteristic remanence isolated at 17 sites in Silurian sediments from the Aksu and Kalpin areas includes 7 sites with suspected contamination from regional Permian igneous activity. The 10 remaining sites, all from Kalpin, yield a positive fold test and a paleopole at 19.1 degrees N, 172.9 degrees E (A(95) = 5.5 degrees) significantly removed from younger paleopoles from Tarim indicating a Late Llandovery to Wenlock remanence age. The new Mid-Late Ordovician paleopole places the Tarim Block at similar to 32 degrees S, probably in the vicinity of the Arabian margin of Gondwana. Rapid APW between similar to 460 and similar to 433 Ma records large differential dextral motions of Tarim together with other continental blocks along the Paleo-Asian Ocean margin which brought the China continental blocks into proximity with Australia by mid-Silurian times in low (similar to 9 degrees N) northerly paleolatitudes.
机译：在古生代晚期之前，塔里木块的运动学差不多理解，本研究旨在澄清奥陶涅师和硅里亚时代的运动。我们从奥陶氏海洋沉积物12个地点报告了来自塔里姆阿克苏和塔里姆阿克苏岛和喀尔佩地区的21个岛屿细粒砂岩和泥岩地区的古磁性纪录。与我们以前报告的初步结果一起，奥陶语沉积物将散态保存的预循环型特征遗弃与双极性分开。虽然阳性折叠试验只能将剩余物体定义为新生代，但从塔里木的后硅古聚级聚合中除去相应的古磁杆（33.7度，185.0度，DP / DM = 2.7度/ 4.0度）来自磁性织物的证据表明准原因。来自阿克苏和Kalpin地区的17个位于17个位点的特征剩磁包括7位点，具有来自区域二叠纪的疑似污染。所有来自Kalpin的剩余部位，产生正折叠试验和19.1度N，172.9 e（a（95）= 5.5度）的古ole明显地从塔里姆的年轻古聚从塔里姆显示出莱姆锁定年龄的晚期雷米多洛。新的中期奥陶涅师古波奥将塔里木块与32摄氏度相似，可能是在Gondwana的阿拉伯边缘附近。类似于460的快速APW和类似于433 mA的塔里木的大型差别右旋运动与沿着古亚洲海洋保证金的其他大陆街区，这将中国大陆街区与澳大利亚的中间南部的近期（类似9度n）北珠古萎缩。

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