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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Paleomagnetic study of middle Cretaceous rocks from Yunlong, western Yunnan, China: evidence of southward displacement of Indochina
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Paleomagnetic study of middle Cretaceous rocks from Yunlong, western Yunnan, China: evidence of southward displacement of Indochina

机译：云南西部云龙中白垩统中古岩石研究：印度支那向南位移的证据

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摘要

Middle Cretaceous red sandstones and siltstones were collected at 20 sites for paleomagnetic study from the Nanxin Formation around Yunlong (25.8 deg N, 99.4 deg E), western part of Yunnan province, China. After stepwise thermal demagnetization, high-temperature component magnetization with unblocking temperature of about 675 deg C is isolated. A positive fold test at the 99% confidence limit shows that the high-temperature component magnetization is primary for the middle Cretaceous Nanxin Formation. A tilt-corrected formation mean direction is D = 40.2 deg, I = 49.9 deg with #alpha#_(95) = 3.9 deg, corresponding to a paleopole at 54.6 deg N, 171.8 deg E with A_(95) = 4.4 deg. Comparison with previously reported Cretaceous paleomagnetic directions indicates that the Yunlong area has been subjected to southward displacement by 11.9 +- 7.5 deg (corresponding to 1300 +- 800 km) with respect to the stable Yangtze craton since Cretaceous time as well as clockwise rotation through 36.3 +- 13.6 deg. This study elucidates that Indochina was squeezed out of the Asian continent due to collision of India accompanied with clockwise rotation.
机译：从云南西部云龙（南北25.8度，东经99.4度）的南新组收集了20个古白垩纪红砂岩和粉砂岩进行古地磁研究。在逐步进行热退磁之后，将隔离温度约为675摄氏度的高温成分磁化。在99％置信度下的正褶皱测试表明，高温分量磁化强度是白垩纪南新组中段的主要磁化强度。倾斜校正的地层平均方向为D = 40.2度，I = 49.9度（其中#alpha #_（95）= 3.9度），对应于古极在N处54.6度，在E处为171.8度，A_（95）= 4.4度。与先前报道的白垩纪古磁方向的比较表明，自白垩纪以来，相对于稳定的扬子克拉通，云龙地区经历了向南位移11.9±7.5度（相当于1300±800 km），并经历了36.3次顺时针旋转+-13.6度这项研究阐明印度支那是由于印度的碰撞和顺时针旋转而被挤出亚洲大陆的。

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