| 松辽冰盖与松辽分水岭翘板迁移间的动力关系探讨 |
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| 引用本文： | 王照波,王江月,李宝杰.松辽冰盖与松辽分水岭翘板迁移间的动力关系探讨[J].山东国土资源,2020,36(8). |
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| 作者姓名： | 王照波 王江月 李宝杰 |
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| 作者单位： | 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室,山东济南 250013;沂蒙山国家地质公园管理局,山东临沂 273304;山东指南针矿产勘查有限公司,山东临沂 276006;曲阜师范大学地理与旅游学院,山东 日照 276800;山东指南针矿产勘查有限公司,山东临沂 276006 |
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| 基金项目： | 实验室开放基金;山东指南针矿产勘查有限公司东亚冷槽追索计划 |
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| 摘 要： | 广布于松辽平原科尔沁沙地的巨型弧形沙垄的成因一直未能得到很好解释,该项研究采用罗根冰碛变形机理对该区的巨型弧形沙垄、密布的湖泡等特征地貌进行分析,发现其与斯堪的纳维亚冰盖、劳伦泰德冰盖的冰下软基变形地貌特征具有同一性,从而确认巨型弧形沙垄为冰盖冰流形成的巨型流线、罗根冰碛与锅穴构造的遗留,从而佐证了"松辽冰盖"的存在。研究发现松辽平原的巨型弧形流线显示出具有从盆地周围向沉降中心延伸、汇聚的特征,这表明流线的走向受制于地势的控制,而非所谓的风力所为。此外根据巨型冰川流线的展布形态与松辽分水岭之间存在的反常关系,发现在冰盖消融后松辽分水岭发生了北移现象,这一现象的产生可能与冰盖消融后导致的松辽盆地的失压反弹隆升有关。根据松辽分水岭的迁移时间、风沙层序年龄、荷载构造扰动地层年龄的综合约束,初步判断松辽冰盖的最近一次的发生时间在晚更新世早期(MIS4阶段)的东山冰期。
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| 关 键 词： | 松辽冰盖 巨型冰川流线 罗根冰碛 荷载构造 |
Study on Dynamic Relationship between Songliao Ice Sheet and Seesaw Migration in Songliao Watershed |
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| WANG Zhaobo,WANG Jiangyue and LI Baojie.Study on Dynamic Relationship between Songliao Ice Sheet and Seesaw Migration in Songliao Watershed[J].Land and Resources in SHANDONG Province,2020,36(8). |
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| Authors: | WANG Zhaobo WANG Jiangyue and LI Baojie |
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| Abstract: | The origin of giant arc sand ridges widely distributed in Horqin sandy land of Songliao Plain has not been clearly explained. Through analyzing geomorphological characteristics, such as giant arc longitudinal dune, intensive lake bubbles and so on, by using deformation mechanism of Rogan moraine, it is found that the characteristics of longitudinal dune is identical with under-ice softlandforms in Scandinavian and Lauren tade ice sheet. It is confirmed that giant streamline, Rogan moraine, pothole are formed by ice sheet. It has revealed the existence of Songliao ice sheet. It is found that the giant arc streamline in Songliao plain shows the characteristics of extending and converging from the surrounding of the basin to the subsidence center. It is showed that the direction of the streamline is controlled by topography rather than wind. In addition, according to the abnormal relation between the spread form of the giant glacier streamline and the Songliao ice sheet, it is found that the latter moved northward after melting, which may be related to rebound upliftreliefingpressure caused by melting. According to comprehensive analysis of migration time and sequence age and load structure disturbance stratum age in Songliao ice sheet, it can preliminary determined that the last occurrence time of Songliao ice sheet is in Dongshan Ice Age in the early period of late Pleistocene (MIS4 stage). |
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| Keywords: | Songliao ice sheet giant glacier streamline Rogan moraine load structure |
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