王嘉新^1,,
谢远云^1,2,,,
康春国³,
迟云平^1,2,
吴鹏¹,
魏振宇¹,
孙磊¹
1. 哈尔滨师范大学地理科学学院, 黑龙江 哈尔滨 150025
2. 哈尔滨师范大学, 寒区地理环境监测与空间信息服务黑龙江省重点实验室, 黑龙江 哈尔滨 150025
3. 哈尔滨学院地理系, 黑龙江 哈尔滨 150086

基金项目: 国家自然科学基金项目（批准号：41871013和41601200）资助


详细信息

作者简介: 王嘉新, 男, 25岁, 硕士研究生, 河流地貌过程研究, E-mail:1459920943@qq.com

通讯作者: 谢远云, E-mail:xyy0451@hrbnu.edu.cn

中图分类号: P618.2;P532

收稿日期:2019-06-14
修回日期:2019-11-08
刊出日期:2020-01-25

The indication of the heavy mineral characteristics of the core in Harbin Huangshan to the Quaternary drainage evolution of Songhua River

Wang Jiaxin^1,,
Xie Yuanyun^1,2,,,
Kang Chunguo³,
Chi Yunping^1,2,
Wu Peng¹,
Wei Zhenyu¹,
Sun Lei¹
1. College of Geographic Science, Harbin Normal University, Harbin 150025, Heilongjiang
2. Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Harbin Normal University, Harbin 150025, Heilongjiang
3. Geography Department, Harbin Institute, Harbin 150086, Heilongjiang


More Information

Corresponding author: Xie Yuanyun,E-mail:xyy0451@hrbnu.edu.cn

MSC: P618.2;P532

--> Received Date: 14 June 2019
Revised Date: 08 November 2019
Publish Date: 25 January 2020


摘要
摘要:松花江水系演化研究对于理解该区域的构造-气候-地貌演化具有重要意义，但其研究相对较为薄弱，特别是对于第四纪松花江中上游流向是否存在反转，一直存在争论，也没有确切的证据。河流沉积物是河流地质过程的产物，是研究水系演化的重要地质档案。对哈尔滨荒山岩芯（深度101.11 m，底界年龄1.68~1.70 Ma）沉积物进行了古地磁、磁化率和重矿物分析，结果表明：岩芯62.3 m（0.94 Ma）深度的上、下地层的磁化率和重矿物特征存在明显不同。62.3 m以下地层的磁化率极低（甚至为0），且重矿物特征和依兰方向的河流相近；而62.3 m以上地层的磁化率突然增大，并呈现出周期性的高低变化，重矿物特征与松原方向的现代河流相似。磁化率和重矿物组合特征反映的沉积物物源变化指示了松花江中上游水系的反转。早更新世早期，松花江肇源-依兰段的水流从依兰方向向西注入松嫩湖盆；早更新世中晚期，佳依分水岭不断抬升，三江平原和松嫩平原不断下降，导致分水岭两侧河流溯源侵蚀加剧；在0.94 Ma B.P.，佳依分水岭被切穿，松花江水流发生反转，自西向东流经佳依峡谷进入三江平原。
关键词: 松花江/
荒山岩芯/
重矿物/
物源变化/
水系演化

Abstract:The study on the evolution of Songhua River system is of great significance for understanding the evolution of structure-climate-landform in this area, but its research is relatively weak, especially for the reversal of the flow direction in the middle and upper reaches of the Songhua River in Quaternary, there has been controversy and no conclusive evidence. Fluvial sediment is the product of fluvial geological process and an important geological archive to study the evolution of river system. Thus, paleomagnetism, magnetic susceptibility and heavy mineral analysis were carried out on the core (depth in 101.11 m, bottom age in 1.68~1.70 Ma) sediments of Harbin Huangshan (45°47'32.73"N, 126°47'43.75"E). The results reveal the following:the magnetic susceptibility and heavy mineral characteristics of the upper and lower strata at 62.3 m depth of the core are obviously different. The average value of the magnetic susceptibility of the formation above 62.3 m is 20.70×10^-8 m³/kg, and that of the formation below 62.3 m is 3.47×10^-8 m³/kg. Apatite, epidote, hematite, ferromagnetic minerals, zircon, sphene, pyroxene, garnet and tourmaline are different in the upper and lower strata of 62.3 m core. The stable heavy minerals in the formation above 62.3 m of core are mainly ilmenite+hematite+sphene (73~125 μm) and sphene+hematite+leucotite (125~250 μm), while those below 62.3 m of core are mainly sphene+ilmenite+zircon (73~125 μm) and sphene+ilmenite+hematite (125~250 μm). The ZTR index of the stratum above 62.3 m is smaller, ranging from 0.44% to 1.82% (average value 1.13%), while the ZTR index of the stratum below 62.3 m is significantly larger, ranging from 0.93% to 30.88% (average value 4.16%). The heavy mineral characteristics of the strata below 62.3 m are similar to those of rivers in Yilan direction, while those of the strata above 62.3 m are similar to those of modern rivers in Songyuan direction. The change of sediment provenance reflected by magnetic susceptibility and heavy mineral assemblages indicates the reverse change of water system in the middle and upper reaches of Songhua River. Before 0.94 Ma B.P., the water flow in the middle and upper reaches of Songhua River came from Yilan direction and flowed into Songnen Lake Basin from east to west, and after 0.94 Ma B.P., the water flow in Songhua River reversed and flowed from west to east into Sanjiang Plain through Jiayi gorge. In the late Early Pleistocene, the Jiayi watershed continued to rise, and the Sanjiang Plain and Songnen Plain continued to decline, which led to the intensified headwater erosion of the rivers on both sides of the watershed. At 0.94 Ma, the Jiayi watershed was cut through, the rivers began to reverse, and the modern Songhua River system was gradually established.
Key words:Songhua River/
Huangshan core/
heavy minerals/
provenance change/
drainage evolution



PDF全文下载地址:

http://www.dsjyj.com.cn/data/article/export-pdf?id=dsjyj_11719