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首页> 外文期刊>Journal of Asian earth sciences >Internal deformation of the Shan-Thai block inferred from paleomagnetism of Jurassic sedimentary rocks in Northern Thailand
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Internal deformation of the Shan-Thai block inferred from paleomagnetism of Jurassic sedimentary rocks in Northern Thailand

机译：从泰国北部侏罗纪沉积岩古磁铁矿推断山泰块体的内部变形

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摘要

Paleomagnetic samples of red sandstones were collected at 16 sites from the Lower to Upper Jurassic Phu Kradung formation and the Upper Jurassic Phra Wihan formation around Nan City (19.2°N, 101.0°E) in the southern region of the Shan-Thai block. After stepwise thermal demagnetization, a high-temperature component with an unblocking temperature of about 680 ℃ is isolated from 11 sites. We interpret this to be a prefold characteristic remanent magnetization because of a positive fold test at the 95% confidence level. The tilt-corrected mean paleomagnetic direction from 11 sites is D = 32.3°, I= 33.3°, α_(95) = 12.2°, k = 15.0, which gives a paleomagnetic pole for this area of 60.1°N, 186.5°E with A_(95) = 11.7°. Compared with a Jurassic paleopole for the stable part of the Yangtze block, we observe a clockwise tectonic rotation of 12.8°, which is similar to the observed rotation (18-28°) of the northern region of the Shan-Thai block. This amount contrasts with a large rotation of more than 45° that is estimated from the narrow zone extending from Luxi to Mengla in the central region of this block. This declination aspect suggests that a coherent whole block rotation by about 20° of the Shan-Thai block took place in an earlier phase during indentation of India into Asia and that an internal deformation with additional local rotation between 25° and 77° followed within a limited zone in the central part. The internal deformation of the Shan-Thai block absorbed the stress on the Asian continent induced by indentation of India as well as its coherent whole block motions of clockwise rotation and southward displacement.
机译：在山泰地块南部地区南城（19.2°N，101.0°E）周围的下侏罗统至上侏罗统Phu Kradung组和上侏罗统Phra Wihan组的16个地点采集了红砂岩的古磁样品。在逐步进行热退磁之后，从11个位置中分离出了具有约680℃畅通温度的高温组件。由于在95％置信水平下进行了正向折叠测试，因此我们将其解释为预折叠特征剩余磁化强度。来自11个位置的经倾斜校正的平均古磁方向为D = 32.3°，I = 33.3°，α_（95）= 12.2°，k = 15.0，这给出了该区域60.1°N，186.5°E的古磁极A_（95）= 11.7°。与侏罗纪古极相比，扬子地块的稳定部分，我们观察到顺时针构造旋转为12.8°，这与山泰地块北部地区的观察到的旋转（18-28°）相似。该数量与45°以上的大旋转形成对比，据估计，该旋转是在该区块中心区域从鲁西延伸至Men腊的狭窄区域。这种偏斜方面表明，在印度向亚洲压陷的较早阶段，整个山体块相干旋转了泰泰块体约20°，并且内部变形伴随着另外的25°和77°之间的局部旋转。中央区域有限。泰泰地块的内部变形吸收了印度的压痕及其顺时针旋转和向南位移的整体运动引起的亚洲大陆上的应力。

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