青海共和盆地岩石圈热-流变结构及地热意义
    点此下载全文
引用本文:蔺文静,甘浩男,赵振,张盛生.2023.青海共和盆地岩石圈热-流变结构及地热意义[J].地球学报,44(1):45-56.
DOI:10.3975/cagsb.2022.092001
摘要点击次数: 883
全文下载次数: 752
作者单位E-mail
蔺文静 中国地质科学院水文地质环境地质研究所
自然资源部地热与干热岩勘查开发技术创新中心 
linwenjing@mail.cgs.gov.cn 
甘浩男 中国地质科学院水文地质环境地质研究所
自然资源部地热与干热岩勘查开发技术创新中心 
 
赵振 青海省环境地质勘查局  
张盛生 青海省水文地质工程地质环境地质调查院  
基金项目:中国地质调查局地质调查项目(编号: DD20221676-4);青海省清洁能源矿产专项(编号: 2022013004qj004)
中文摘要:地球深度热状况是深部地球动力学和岩石圈活动性研究的重要内容, 岩石圈热结构和热-流变结构可以很好地揭示岩石圈范围内的热状况。近年来, 在青海共和盆地钻探揭露了深部高温干热岩体, 关于其热源机制尚未有定论。本文以青海共和盆地为研究对象, 分析壳内温度分布和流变强度, 探讨壳内低速体的地质属性。结果表明, 共和盆地的地壳流变结构从上而下分为脆性和韧性两层, 韧性层又包括中地壳和下地壳两层韧性层, 在上地壳尺度均表现为脆性破裂为主, 并逐渐过渡为韧性流变; 恰卜恰地区在脆性破裂的上地壳延伸至中下地壳时, 破裂沿一系列滑脱面发生韧性滑动, 局部地段形成壳内熔融, 为恰卜恰地区提供了额外的热源, 使其大地热流值(109.6 mW/m2)显著高于贵德地区(77.6 mW/m2)。这一认识为共和盆地壳内低速体存在提供了新的佐证, 也为区内干热岩热源分析以及高温地热资源探测开发提供了科学依据。
中文关键词:大地热流  地壳热结构  深部温度  热-流变结构  壳内低速体
 
Lithospheric Thermal-rheological Structure and Geothermal Significance in Gonghe Basin, Qinghai Province
Abstract:The thermal condition of the Earth at depth is an important element in the study of deep geodynamics and lithospheric activity, and the lithospheric thermal structure and thermal-rheological structure can well reveal the thermal condition in the lithospheric range. In recent years, drilling activities in Qinghai Gonghe Basin have revealed deep high-temperature hot dry rocks, about which the heat source mechanism has not been conclusively established. In this paper, we take Gonghe Basin in Qinghai as the research object, analyze the intracrustal temperature distribution and rheological intensity, and explore the geological properties of the intracrustal low-velocity body. The results show that the crustal rheological structure of Gonghe Basin is divided into brittle and ductile layers from top to bottom, and the ductile layer includes two ductile layers, the middle crust and the lower crust, all of which show mainly brittle rupture at the upper crustal scale and gradually transition to ductile rheology. In the Qiaboqia region, when the brittle rupture of the upper crust extended to the middle and lower crust, the rupture occurred along a series of slip surfaces with ductile sliding, and intracrustal melting was formed in local sections, which provided additional heat source for the Qiaboqia region and made its geothermal heat flow value (109.6 mW/m2) significantly higher than that of the Guiade region (77.6 mW/m2). This understanding provides new evidence for the existence of low-velocity bodies in the crust of Gonghe Basin, and also provides a scientific basis for the analysis of heat sources of hot dry rocks in the region and the exploration and development of high-temperature geothermal resources.
keywords:heat flow  crustal thermal structure  deep temperature  thermal-rheological structure  intracrustal low-velocity body
查看全文  查看/发表评论  下载PDF阅读器
版权所有 《地球学报》编辑部 Copyright©2008 All Rights Reserved
主管单位:中华人民共和国自然资源部 主办单位:中国地质科学院
地址: 北京市西城区百万庄大街26号,中国地质科学院东楼317室 邮编:100037 电话:010-68327396 E-mail: diqiuxb@126.com
技术支持:北京勤云科技发展有限公司
京ICP备05029128号-6

京公网安备 11010202007616号