A paleomagnetic study from the Late Jurassic volcanics (155 Ma), North China: Implications for the width of Mongol-Okhotsk Ocean

被引：84
|
作者：
Pei Junling [1 ,2 ]
Sun Zhiming [1 ]
Liu Jing [1 ,3 ]
Liu Jian [1 ]
Wang Xisheng [1 ]
Yang Zhenyu [1 ]
Zhao Yue [1 ]
Li Haibing [2 ]
机构：
[1] CAGS, Key Lab Paleomagnetism, Inst Geomech, Beijing 100081, Peoples R China
[2] State Lab Continental Tecton & Dynam, Beijing 100081, Peoples R China
[3] E China Mineral Explorat & Dev Bur Nonferrous Met, Nanjing 210007, Peoples R China
来源：
TECTONOPHYSICS | 2011年 / 510卷 / 3-4期
关键词：
North China Block; Paleomagnetic; Mongol-Okhotsk Ocean; Siberia; POLAR WANDER PATH; SOUTH CHINA; GEODYNAMIC HISTORY; MAJOR BLOCKS; SICHUAN BASIN; FOLD TEST; CONSTRAINTS; COLLISION; EVOLUTION; CLOSURE;
D O I：
10.1016/j.tecto.2011.08.008
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
A new paleomagnetic study has been carried out on the Tiaojishan Formation effusives in the Chengde area, North China Block (NCB). The age of the Tiaojishan Formation volcanics was recently dated from 153 Ma to 161 Ma by U-Pb and 40Ar-39Ar. A total of 154 samples from 16 sites within the Tiaojishan Formation were collected. Detailed stepwise thermal demagnetization allows us to isolate two components from 77 oriented drill-core samples. A low-temperature component identified in most samples falls close to the present local Earth field direction. Characteristic remanent directions obtained from high-temperature pass-reversal test yield a pole position at 240.3 degrees E, 59.9 degrees N with alpha 95 = 6.8 degrees. Combined with coeval paleopoles obtained from the Siberia Block (SIB), these results show a significant paleolatitude displacement between the NCB and SIB, which indicates that the Mongol-Okhotsk Ocean was still open with similar to 3000 km width in its eastern part at ca. 155 Ma. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：370 / 380
页数：11
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