| 松辽盆地白垩系青山口组核形石的发现及其环境意义 |
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| 引用本文： | 刘万洙,王璞珺,高有峰,王国栋,白雪峰.松辽盆地白垩系青山口组核形石的发现及其环境意义[J].地质学报,2008,82(5):594-600. |
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| 作者姓名： | 刘万洙 王璞珺 高有峰 王国栋 白雪峰 |
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| 作者单位： | 1. 吉林大学地球科学学院,长春,130061
2. 大庆油田勘探开发研究院,黑龙江大庆,163712 |
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| 基金项目： | 本文为国家重点基础研究发展计划项目（编号 2006CB701403）资助的成果。 |
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| 摘 要： | 在松辽盆地上白垩统青山口组中首次发现核形石灰岩,见于细砂岩、粉砂岩和泥质岩层系中。核形石有三种类型：环状、石笋状和姜状核形石。多数核形石由核心和多环纹层组成，少数具不明显核心或呈单层环状。该套核形石形成于湖泊三角洲前缘分流河口砂坝侧翼的水下分流间湾环境。地形坡度和三角洲前缘的生长，致使核形石普遍发生准同生变形。由于核形石出现于青山口组二、三段，处于温湿向干热气候转变时期，因此核形石可能作为重要的古气候变迁标志。
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| 关 键 词： | 松辽盆地 白垩系青山口组 核形石 沉积环境 古气候标志 |
| 收稿时间： | 2007/12/27 0:00:00 |
| 修稿时间： | 2007年12月27 |
Discovery of Oncolites in the Qingshankou Formation of Cretaceous, Songliao Basin and Its Environmental Significance |
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| LIU Wanzhu,WANG Pujun,GAO Youfeng,WANG Guodong,BAI Xuefeng.Discovery of Oncolites in the Qingshankou Formation of Cretaceous, Songliao Basin and Its Environmental Significance[J].Acta Geologica Sinica,2008,82(5):594-600. |
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| Authors: | LIU Wanzhu WANG Pujun GAO Youfeng WANG Guodong BAI Xuefeng |
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| Abstract: | Oncolitic limestone was firstly discovered in the Qingshankou Formation of Cretaceous in Songliao Basin. It occurs primarily in fine-grained sandstone, siltstone and the mudstone. Based on the metamorphic features, the oncolites from the study area can be divided into three types: annular oncolite, stalagmite oncolite, and ginger-shaped oncolite. Most oncolites are composed of a core and multi-ring lamina, but minor amount doesn't have distinct core or monolayer lamina.Research indicated that the oncolites formed mainly in the underground shallow bay environment of lake delta front. The penecontemporaneous deformation of the oncolites is attributed to growing of topographic slope and deltaic front. The fact that the oncolites occur in the second and third sections of the Qingshankou Formation indicates a transitional period from humid to dried and hot climates, and therefore, the rock can be considered an important index of paleoclimate changes. |
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| Keywords: | Songliao Basin Qingshankou Formation of Cretaceous oncolite depositional environment paleoclimatic mark |
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