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CONTINENTAL BASALTIC VOLCANISM AND GEOTHERMAL SYSTEM

大陆玄武岩火山作用和地热系统

基本信息

批准号：
08044156
负责人：
EHARA Sachiko
金额：
$ 3.71万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044156/
关键词：
Geothermal fields Geothermal systems Volcanoes Basalt Geothermal survey Changbaishan volcano

项目摘要

In this study we clarified the geothermal systems associated with basaltic volcanoes in the northeastern part of China. The main results are shown below :1.From the study of heat flow distribution in the northeastern part of China, it is clarified that the basaltic magmas begin to occur at a depth of 70km to 150km, that is, not in the crust but in the upper mantle. Such deep generation of basaltic magma does not develop geothermal systems in the region generally.2.From the study of thermal history based on the fission track dating of granitic rocks, it is clarified that the crust have not experienced so high temperature state since about 100Ma.3.An active geothermal system develops on the flank of Changbaishan volcano at the border of China and North Korea and it is maintained by mixing of magmatic fluids and meteoric water. The magmatic fluids are derived from not basaltic magmas but trachytic magmas which are formed by remelting of the crust by basaltic intrusions. The trachytic magmas assumed in the shallow crust, that is, about 8 km deep.4.Small geothermal systems develop in the Quaternary basaltic volcanic region at the border of China and Mongolia. But these geothermal systems are not formed by mixing of magmatic flluids and meteoric water.They are formed only by heating of deeply penetrated meteoric water.5.There are no geothermal systems in the Quaternar basaltic volcanic region at the border of China and Russia.Form the above results, we can conclude that geothermal systems are not developped by basaltic magmas generally. However, if basaltic intrusions heat the shallow crust and generate silicic magmas in the shallow crust, geothermal systems can develop in the basaltic volcanic region.

在这项研究中，我们澄清了与中国东北部玄武岩火山有关的地热系统。主要结果如下：1.通过对中国东北地区大地热流分布的研究，明确了玄武岩浆开始产出于70 ~ 150 km深度，即不是在地壳中而是在上地幔中。2.从花岗岩裂变径迹测年的热历史研究来看，3.中朝边境长白山火山侧翼发育一个活跃的地热系统，它是由中朝边境长白山火山岩混合而成的。岩浆流体和大气降水。岩浆流体不是来自玄武质岩浆，而是玄武质侵入体重熔地壳形成的粗面质岩浆。粗面质岩浆产于地壳浅部，约8 km深。4.中蒙边界第四纪玄武质火山岩区发育小型地热系统。但这些地热系统不是由岩浆流体与大气降水混合而成的，而是由深渗大气降水加热而成的。5.中俄边境地区的玄武质火山岩区不存在地热系统。然而，如果玄武质侵入体加热地壳浅层并在地壳浅层产生岩浆，则玄武质火山区可以发育地热系统。