Paleomagnetic study of Upper Jurassic rocks from the Sichuan basin: tectonic aspects for the collision between the Yangtze Block and the North China Block

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• 作者：Yokoyama ; Masahiko ; Liu ; Yuyan ; Halim ; Nadir ; Otofuji ; Yo-ichiro
• 关键词：paleomagnetism ; tectonics ; Upper Jurassic ; Yangtze Platform ; plate collision
• 刊名：Earth and Planetary Science Letters
• 出版年：2001
• 出版时间：December 15, 2001
• 年：2001
• 卷：193
• 期：3-4
• 页码：273-285
• 全文大小：530 K

文摘

A paleomagnetic study has been carried out on Late Jurassic redbeds in the Sichuan basin, at the northern part of the Yangtze Block. Upper Jurassic brownish-red sandstones and brownish-red siltstones were collected in the Penglaizhen Formation at 26 sampling sites around Jiangyang city (30.4°N, 104.5°E). Thermal demagnetization isolated a high temperature magnetization component with a maximum unblocking temperature of about 690°C. The primary nature of magnetization acquisition is ascertained through a 95 % confidence level positive fold test, as well as a positive reversal test. The tilt-corrected overall mean direction of 24 sites is D