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| 四川茂县较场湖相沉积磁性地层初步研究 | |
| 引用本文： | 王书兵,李毅,夏雄刚,范振飞,傅建利,王燕,蒋复初.四川茂县较场湖相沉积磁性地层初步研究[J].地质力学学报,2006,12(4):416-422. |
| 作者姓名： | 王书兵 李毅 夏雄刚 范振飞 傅建利 王燕 蒋复初 |
| 作者单位： | 1. 中国地质科学院地质力学研究所,北京,100081 2. 河南省有色金属地质勘查总院,河南,郑州,450052 3. 湖南省有色地勘局二总队,湖南,湘潭,411104 4. 福建华东岩土工程有限公司,福建,南平,353000 |
| 基金项目： | 中国科学院湖泊沉积与环境重点实验室基金;国家自然科学基金;中国地质调查局地质调查项目 |
| 摘 要： | 四川茂县较场剖面厚101.1m,其中湖相沉积厚98.0m,为一套浅黄色—灰色的粉砂、粘土质粉砂和粉砂质粘土层。古地磁测试显示,除2个样品的磁偏角显示负极性外,其余样品的磁偏角全部为正,属布容正极性时,没有出现B/M界线。根据该套地层的岩性、岩相和所处的地貌部位,可以和云南金沙江谷地的龙街组对比,推测其开始沉积的时代为100~120kaBP。另外,距顶4.0 m处光释光年龄为16.7±1.2 kaBP,推测其结束于10kaBP。湖相沉积历时约100kaBP,是岷江流域出露的末次(间)冰期以来厚度最大的剖面之一。 |
| 关 键 词： | 湖相沉积 末次(间)冰期 岷江流域 四川茂县 |
| 文章编号： | 1006-6616（2006）04-0416-07 |
| 收稿时间： | 2006-02-21 |
| 修稿时间： | 2006年2月21日 |
MAGNETOSTRATIGRAPHIC STUDY OF LAKE SEDIMENTS IN JIAOCHANG, MAOXIAN COUNTY, SICHUAN |
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| WANG Shu-bing,LI Yi,XIA Xiong-gang,FAN Zhen-fei,FU Jian-li,WANG Yan,JIANG Fu-chu.MAGNETOSTRATIGRAPHIC STUDY OF LAKE SEDIMENTS IN JIAOCHANG, MAOXIAN COUNTY, SICHUAN[J].Journal of Geomechanics,2006,12(4):416-422. | |
| Authors: | WANG Shu-bing LI Yi XIA Xiong-gang FAN Zhen-fei FU Jian-li WANG Yan JIANG Fu-chu |
| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081,Henan Institute of Nonferrous Metals Geology and Mineral Exploration, Zhengzhou 410052, Henan,Second Geological Survey Party, Hunan Bureau of Nonferrous Metals Geology and Mineral Exploration, Xiangtan 4111004,Fujian Huadong Geotechnical Engineering Co. Ltd., Nanping 353000, Fujian,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081 and Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081 |
| Abstract: | The Jiaochang section in Maoxian County,Sichuan Province,is 101.1 m thick,in which lacustrine sediments are 98.0 m thick,consisting of light yellow-gray silt,clayey silt and silty clay.Paleomagnetic measurements indicate that all the samples show normal polarity except two samples that have negative magnetic declination.The magnetic polarity belongs to Brunhes normal polarity and the B/M boundary is absent.According to the lithology,lithofacies and landform location,the strata can be correlated with the Longjie Formation in the Jinsha River valley,Yunnan.So it is inferred that the sediments began deposition at 100-120 ka BP.In addition,the optically stimulated luminescence(OSL) age is 16.7±1.2 ka BP at 4.0 m below the surface of the sediments,so it is inferred that the deposition ended at 10 ka BP according to calculation.The deposition of the lake sediments lasted for(100,000) years.The section is one of the exposed thickest sections since the last glaciation(deglaciation) in the Minjiang River valley. |
| Keywords: | lacustrine sediments last glaciation(interglaciation) Minjiang River Maoxian County Sichuan Province |
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