地球物理学报 ›› 2015, Vol. 58 ›› Issue (4): 1269–1283.doi: 10.6038/cjg20150415

• 地球动力学·地震学·地磁学 • 上一篇    下一篇

黑龙江省饶河枕状玄武岩古地磁学研究及其构造意义

任收麦1, 朱日祥2, 邱海峻1, 周建波3, 邓成龙2   

  1. 1. 中国地质调查局油气资源调查中心, 北京 100029;
    2. 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029;
    3. 吉林大学地球科学学院, 长春 130061
  • 收稿日期:2014-02-12 修回日期:2015-03-26 出版日期:2015-04-20
  • 作者简介:任收麦,男,1973年生,博士,研究员,主要从事构造磁学和页岩气地质学研究. E-mail:realshaw@vip.sina.com
  • 基金资助:
    国土资源部油气重大专项项目《松辽盆地及外围上古生界油气资源战略选区》(2009GYXQ12)和国家自然科学基金(41472197)共同资助.

Paleomagnetic study on Middle Jurassic lavas of Heilongjiang Province, NE China and its tectonic implications

REN Shou-Mai1, ZHU Ri-Xiang2, QIU Hai-Jun1, ZHOU Jian-Bo3, DENG Cheng-Long2   

  1. 1. Oil & Gas Survey, China Geology Survey, Beijing 100029, China;
    2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
    3. The College School of Earth Sciences, Jilin University, Chang Chun 130061, China
  • Received:2014-02-12 Revised:2015-03-26 Online:2015-04-20

摘要: 蛇绿岩中枕状玄武岩的古地磁学研究可为古海洋的恢复与演化提供定量化依据.黑龙江省饶河地区中侏罗世枕状玄武岩的岩石学、岩石磁学研究表明,该岩石具备水下喷出特点,发育辉长结构,载磁矿物为磁铁矿.17个采点181块样品的热退磁实验表明,中侏罗世枕状玄武岩记录了高温分量和中温分量,前者为熔岩喷发记录的原生剩磁方向,平均方向D/I=59.4°/46.3°,α95=6.8°,对应的极位置为40.3°N,224.6°E,A95=7°;后者可能为晚侏罗世—早白垩世岩浆热事件的叠加,平均方向D/I=55.4°/60.6°,α95=3.9°,对应的极位置为50.8°N,210.6°E,A95=5.2°.综合考虑区域地质背景,将这一结果与邻区同时代的古地磁数据对比,推测在中侏罗世之前,在饶河杂岩与佳木斯地体之间存在一定规模的海域,与现今日本海相似;早白垩世时期,该海域封闭,饶河杂岩与华北、西伯利亚板块在动力学上已成为整体.

关键词: 饶河杂岩, 中侏罗世, 玄武岩, 古地磁学

Abstract: NE China which experienced multi-stages tectonic evolution, is a key area for research into East Asian tectonic evolution. Normally, paleomagnetism data come from rock samples of the interior of a plate while the size of ocean located in both blocks cannot be identified. Here paleomagnetic data from basaltic pillows in Raohe, NE China were used to study the recovery and evolution of paleo-oceans.181 samples of 17 sites were collected using a portable electric-power drill, and were oriented by both magnetic and sun compasses. The methods, including stepwise thermal demagnetization, rock magnetic and petrologic analyses were used to analyze the paleo-location of the Middle Jurassic basaltic pillows of Raohe, Heilongjiang Province, NE China. Rock magnetic experiments include temperature-dependence of saturated magnetization and hysteresis loops measured by VFTB Curie balance. Thin section identification was carried out on some pilot samples. Then, all the samples were subjected to stepwise thermal demagnetization using a MMTD-60 demagnetizer, with 12 temperature steps up to 585℃. Magnetic remanence measurements were performed on a 2G cryogenic magnetometer. Additionally, some paleomagnetic data of adjacent region have been collected and compared with the study area.The Middle Jurassic basaltic pillows of Raohe, experienced underwater eruption with gabbro texture and magnetite, which show both characteristic high-temperature remanence component and middle-temperature remanence component, with the mean directions of D/I=59.4°/46.3° with α95=6.8° and D/I=55.4°/60.6° with α95=3.9°, respectively. We interpret the high-temperature remanence component as primary magnetization based mainly upon the petrographic analysis, and the middle-temperature remanence component as secondary re-magnetization during the Late Jurassic to Early Cretaceous magmatism. The corresponding pole are at 40.3°N, 224.6°E with A95=7° and at 50.8°N, 210.6°E with A95=5.2°. The paleomagnetic study on basaltic pillow developed between two blocks offers a useful method for researching tectonic evolution. Considering the regional geologic background and paleomagnetic poles of adjacent blocks, our results suggest that there exists an ocean similar to the Japan sea nowdays between the Raohe complex and Jiamusi block before the Middle Jurassic period. This Early Cretaceous pole is in good agreement with those for Siberia, North China, and Inner Mongolia, suggesting that these continental blocks had already sutured together in the Early Cretaceous accompanied by the ocean closing.

Key words: Raohe Complex, Pillow lavas, Middle Jurassic, Paleomagnetism

中图分类号: 

  • P318
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