黑龙江省五大连池尾山地区火山岩浆囊探测与干热岩地热地质条件分析
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中国地质调查局水文地质环境地质调查中心,中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室,中国地质调查局水文地质环境地质调查中心,中国地质调查局水文地质环境地质调查中心,中国地质调查局水文地质环境地质调查中心,中国地质调查局水文地质环境地质调查中心,中国地质调查局水文地质环境地质调查中心

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Volcanic Magma Chamber Survey and Geothermal Geological Condition Analysis for Hot Dry Rock in the Weishan Volcano in Wudalianchi Region, Heilongjiang Province
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Center for hydrogeology and environmental geology survey, China Geological Survery,tate Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences,Center for hydrogeology and environmental geology survey, China Geological Survery,Center for hydrogeology and environmental geology survey, China Geological Survery,Center for hydrogeology and environmental geology survey, China Geological Survery,Center for hydrogeology and environmental geology survey, China Geological Survery,Center for hydrogeology and environmental geology survey, China Geological Survery

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    摘要:

    五大连池火山群北部的尾山火山形成于第四纪中更新世,具中心式火山喷发,距今(0.57~0.31)±0.05 Ma。同美国芬顿山干热岩项目所在地火山活动于1.40~1.10 Ma相比,其下方具备发育正在冷却中的岩浆囊的可能。重、磁法勘查结果表明,尾山地区基底以北宽河组(Pt3∈1b)变质岩为主,放射状断裂和环形构造发育,外环影响直径12~13km,是地壳浅部火山穹窿构造的反映。天然地震背景噪声层析成像勘查结果表明,尾山下部火山岩浆囊顶界埋深6.5 km,至8 km深度面积扩展至约13 km2,至13 km面积扩展至约35 km2,平面上呈北西—南东向展布西大东小的“蝌蚪状”,可能构成了尾山地区干热岩体的热源。大地电磁测深(MT)勘查结果表明,该地区高导体/高温岩体主体顶界埋深5 km,最浅达3 km。MT单点勘查曲线及图解表明,尾山西侧(B点)在约2 km深度,电阻率值降至2 Ω·m以下,4~6 km小于2 Ω·m的低电阻率区域逐渐连成片,6 km以下几乎整体小于2 Ω·m。综合分析认为,五大连池尾山地区具较好的干热岩地热地质条件。

    Abstract:

    The Weishan volcano in the Wudalianchi volcanic group was formed in the Quaternary Medio-Pleistocene in 0.57~0.31 Ma ago. Compared to the hot dry rock project in the Fenton Hill where volcanic activity in 1.40~1.10 Ma, a cooling magma chamber may possibly exist in the crust beneath the Weishan volcano. The gravity and magnetic surveys suggest that the basement of Weishan volcano is mainly consisted of metamorphic rocks of Beikuanhe Group. It’s also characterized as central volcanic eruption with annular structures and radial fractures. The impacted outer diameter can reach 12~13 km, suggesting a volcanic dome in the shallow crust. Based on the investigation of surface wave tomography with seismic ambient noise data and dense seismic array, a possible magma chamber is found beneath the Weishan volcano. The top interface for the possible magma chamber is about 6.5 km in depth, and the areas increase to 13 km2 at 8 km depth and 35 km2 at 13 km depth. The lateral low shear-wave velocity anomaly beneath the Weishan volcano shows a shape of “tadpole”, which may form the hot dry rock resources in this area. The MT survey suggest that the electric resistivity is decreased less than 2 Ω·m in the western area of the Weishan volcano (B point). The areas with low electric resistivity (<2 Ω·m) at 4~6 km depth are gradually combined together. For depth deeper than 6 km, the electric resistivity are mostly less than 2 Ω·m. The integrated analysis of geological, seismic and MT investigations suggest a good geothermal geology environment for the hot dry rock resources around the Weishan volcano, Wudalianchi region.

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张森琦,贾小丰,张杨,李胜涛,李志伟,田蒲源,明圆圆,张超.2017.黑龙江省五大连池尾山地区火山岩浆囊探测与干热岩地热地质条件分析[J].地质学报,91(7):1506-1521.
ZHANG Senqi, JIA Xiaofeng, ZHANG Yang, LI Shengtao, LI Zhiwei, TIAN Puyuan, MING Yuanyuan, ZHANG Chao.2017. Volcanic Magma Chamber Survey and Geothermal Geological Condition Analysis for Hot Dry Rock in the Weishan Volcano in Wudalianchi Region, Heilongjiang Province[J]. Acta Geologica Sinica,91(7):1506-1521.

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  • 收稿日期:2015-05-27
  • 最后修改日期:2016-06-09
  • 录用日期:2016-11-13
  • 在线发布日期: 2017-07-11
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