| 黑龙江省勃利盆地东部坳陷下白垩统穆棱组古环境恢复 |
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| 引用本文： | 刘帅,郭巍,李文强.黑龙江省勃利盆地东部坳陷下白垩统穆棱组古环境恢复[J].世界地质,2018,37(4):1309-1316. |
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| 作者姓名： | 刘帅 郭巍 李文强 |
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| 作者单位： | 吉林大学地球科学学院, 长春 130061 |
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| 基金项目： | 中国地质调查局"松辽盆地深部及外围油气基础地质调查"（12120115001601）. |
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| 摘 要： | 勃利盆地东部坳陷下白垩统穆棱组暗色泥岩发育,通过对勃利盆地Zk2钻井岩芯观察及对暗色泥岩样品进行稀土、微量元素含量变化的分析,恢复了穆棱组沉积时期的古环境。结果显示:研究区穆棱组沉积相以三角洲平原、三角洲前缘和半深湖沉积亚相为主,穆棱组沉积初期气候特征以温暖湿润为主,中期气候变为半湿半干,盐度增加但仍是淡水沉积环境,穆棱组中晚期气候由干旱炎热气候逐步变为温暖湿润气候。穆棱组沉积时期气候总体呈温暖湿润-半湿半干-温暖湿润变化的规律。
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| 关 键 词： | 勃利盆地 下白垩统 穆棱组 地球化学特征 古环境恢复 |
| 收稿时间： | 2018-05-02 |
| 修稿时间： | 2018-07-18 |
Paleoenvironmental reconstruction of Lower Cretaceous Muling Formation in eastern depression,Boli Basin |
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| LIU Shuai,GUO Wei,LI Wen-qiang.Paleoenvironmental reconstruction of Lower Cretaceous Muling Formation in eastern depression,Boli Basin[J].World Geology,2018,37(4):1309-1316. |
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| Authors: | LIU Shuai GUO Wei LI Wen-qiang |
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| Institution: | College of Earth Sciences, Jilin University, Changchun 130061, China |
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| Abstract: | The dark mudstones of Lower Cretaceous Muling Formation are well developed in the eastern depression of Boli Basin. The palaeoenvironment of Muling Formation was restored by observing the core of Zk2 drilling in Boli Basin and analyzing the contents of REE and trace elements in dark mudstone samples. The results showed that the sedimentary facies of Muling Formation in studied area were dominated by delta plain, delta front and semi-deep lacustrine sedimentary sub-facies. The climate of Muling Formation in the early stage was mainly warm and humid, while the climate in mid-stage was semi-wet and semi-dry. Although the salinity increased in Muling Formation in the mid-stage, it was still a freshwater sedimentary environment. The climate of Muling Formation in mid-late period gradually changed from arid and hot to warm and humid. During the deposition period of Muling Formation, the climate generally varied from warm humid to semi-wet and semi-dry, to warm moist. |
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| Keywords: | Boli Basin Lower Cretaceous Muling Formation geochemical characteristics paleoenvironmental restoration |
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