| 五大连池第四纪火山岩层序划分及其构造与生态意义 |
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| 关键词:Wudalianchi Volcanic Group Quaternary volcanoes sequences of volcanic rocks tectonic significance ecological significance |
| 基金项目:中国地质科学院基本科研业务费项目(编号: JYYWF20180101);中国地质调查局地质调查项目(编号: 0100123057; DD20190589; DD20160220; DD20190703);国家自然科学基金项目(编号: 41072073) |
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| Sequences Division of Quaternary Volcanic Rocks in Wudalianchi and Its Tectonic and Ecological Significances |
| A large number of data from predecessors and 1: 50 000 regional survey drilling confirm that the Quaternary volcanic strata in Wudalianchi belong to horizontal strata. Therefore, the division of quaternary volcanic strata in this area is based on the full division and correlation between surface and borehole sequences. From the sedimentary point of view, the Wudalianchi volcanic strata belong to the horizontal strata formed by the Quaternary episodic volcanic eruption in the continuous accumulating process of Song–Nen Basin. Based on the new data of K-Ar isotope dating, the Quaternary volcanic sequences in this area are divided into 11 formations, from bottom to top, corresponding fall into the Lower Pleistocene Jiaodebu basalt (1.214–1.113 Ma); Middle Pleistocene Weishan basalt (0.62–0.285 Ma); The Middle Pleistocene Bijiashan basalt (0.24–0.132 Ma) and the Holocene Laoheishan basalt (290–288 a BP) interlayered with two normal sedimentary strata. Study on volcanic rock sequences and spatial distribution of the stratovolcanoes is of great significances to understand the Wudalianchi volcanoes tectonic background and the ecological environment: Wudalianchi Volcano Group, located at most northeast end of the Datong–Daxinganling volcanic rock belt within the hinterland of NE China, is the most front of the mantle fluid flowing northeastward; The volcanic eruptions of these potassium-rich alkaline basalts contributed significantly to the formation of the rich black land in northeast China, and the platform and volcanic cone topography shaped by volcanic rocks on the Nenjiang Plain had an important impact on ecological diversity and the ecological elements of high-quality groundwater. |
| ZENG Pu-sheng,QIU Shun-fan,LI Rui-zhe,LIU Si-wen,WANG Shi-an,GUO Ru-jun.2021.Sequences Division of Quaternary Volcanic Rocks in Wudalianchi and Its Tectonic and Ecological Significances[J].Acta Geoscientica Sinica,42(6):785-802. |
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