局部热膨胀产生的重力异常及其构造意义     

杨学祥  杨文瑛 《大地测量与地球动力学》1995,(1)

地热梯度的增加不仅引起地壳的体积变化，而且使地壳的荷载发生变化。定量计算表明，在均衡深度以上，局部地壳地热梯度的增加将产生重力负异常。随之而来的地壳均衡运动会造成２ｋｍ左右的地壳上升，用以补偿膨胀后地壳的质量亏损。  相似文献   

论羊八井高温地热系统特性     

《西藏地质》2002,(2):71-79

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洛阳现大型地热田 折合标准煤3,700万吨     

牛洁  王新昌 《西部资源》2014,(3)

<正>近日,河南省地矿与第三地质勘查院在洛阳盆地东部发现一大型地热田,热量相当于一大型煤田,且水质分析显示,洛阳盆地东部地热异常区地热流体含盐量较高,为偏硅酸、溴、碘、镭、氟复合型高矿化度医疗热矿水。偃师市山化镇寺沟村正处于该地热田范围内,该村曾有一处温泉池,当年,泉水汩汩的景象成为村里的一大景观。  相似文献   

Current climate change effects on the ground thermal regime in Central Yakutia     

Stepan Varlamov  Yuri Skachkov  Pavel Skryabin 《寒旱区科学》2014,6(4):0282-0292

The evolution of ground thermal state has been studied to assess impacts of current climatic warming on permafrost in Central Yakutia. The analysis of long-term data of regional weather stations has revealed one of the highest increasing trends in mean annual air temperature in northern Russia. A forecast of surface air temperature fluctuations has been made by applying a frequency analysis method. Monitoring of ground thermal conditions allows us to identify inter-annual and long-term variability among a wide range of natural conditions. Experimental research has indicated a long-term dynamics of ground thermal state evolution： ground temperatures at the depth of zero annual amplitude and seasonally thawed layer depth. Long-term variability of thaw depth shows near-zero to weak positive trends in small valleys in contrast to weak negative trends on slopes. With significant climatic warming, the thermal state of near-surface layers of permafrost demonstrates steadiness. Anthropogenic impacts on ground thermal regime in various terrain types have been qualitatively evaluated. Clear-cutting, ground cover stripping, and post-fire deforestation in inter-alas type terrains result in a significant increase of temperature and seasonal ground thaw depth, as well as adverse cryogenic processes. The dynamics of mean annual ground temperature in slash and burn sites have been evaluated in reference to stages of successive vegetation recovery.  相似文献   

塔里木柯坪塔格地区构造抬升的新证据——来自(U-Th)/He年龄的约束   总被引：1，自引：0，他引：1       下载免费PDF全文

常健  邱楠生  左银辉  李翠翠 《地球物理学报》2011,54(1):163-172

柯坪塔格地区位于西南天山与塔里木盆地之间, 是塔里木地台的一部分, 其构造隆升与天山和塔里木盆地的演化密切相关. 本文首次将(U-Th)/He热定年技术应用于该地区构造抬升的研究, 对该区震旦系露头样品的磷灰石和锆石的(U-Th)/He进行了年龄测定和热史模拟, 结果表明柯坪塔格地区主要经历了4期构造抬升事件, 导致震旦系抬升至地表, 其中磷灰石(U-Th)/He年龄揭示了晚白垩世和中新世两期的构造抬升事件. 在早石炭世, 震旦系温度达到最大, 介于133~150°C之间, 结合沉积埋藏史得到当时的最大埋深是3400~3900 m. 在渐新世-中新世, 受印度-欧亚板块碰撞远程效应的影响, 柯坪塔格地区沿柯坪塔格-沙井子断裂向巴楚隆起上逆冲, 地层快速抬升遭受剥蚀. 在15~10 Ma时, 柯坪塔格地区震旦系已抬升至地表. 自早石炭世至今, 柯坪塔格地区总剥蚀量达6170 m. 柯坪塔格地区自中生代以来的构造-热演化史与塔里木盆地北缘是一致的, 但与天山及处于塔里木盆地内部的巴楚隆起的构造抬升过程存在差异. 中新世以后, 受喜山运动远程效应影响, 柯坪塔格和天山才同处于抬升状态; 而巴楚隆起在古近纪早期仍处于抬升剥蚀状态, 与柯坪塔格地区接受沉积相反. 本文利用(U-Th)/He热定年技术成功地揭示了柯坪塔格地区自震旦纪以来的构造-热演化史, 这些结果有利于人们对这一地区构造抬升的正确认识. 同时, 本研究对塔里木盆地的油气勘探及天山地区的构造研究具有指导意义.  相似文献   

合肥地区地热资源潜力评价   总被引：1，自引：0，他引：1  

宁金野  徐洪苗 《安徽地质》2011,21(1):40-43

地热资源是宝贵的矿产资源,是一种可再生的,优质、环保、清洁能源。合肥是安徽省省会,经济持续快速发展对清洁地热能源的需求不断增长。据有关资料,合肥地区地处莫霍面隆起区,地壳减薄上地幔隆起是合肥地区地温相对高的大的区域地质背景。合肥西,五十里小庙凸起(合肥地区地垒地段)是基底隆起聚热型地热地质成因模式形成地热的有利地段,可作为今后合肥地区地热资源地质勘查的第一靶区。合肥地区的大地构造环境和深部地壳结构对成热条件较为有利,地热资源的潜力较大。  相似文献   

辽宁省地热观测现状及映震分析   总被引：3，自引：0，他引：3  

金众范  王勇  盛国松  张秀梅  陈书权  寇泽峰  赵丹  王英亮 《东北地震研究》2001,17(3):25-32

介绍辽宁省地热观测台网的概况，从观测资料的正常稳定性特征出发，分析了地热异常形态及其与地震的联系，阐述了应用地热前兆异常预报地震的思路。  相似文献   

Study　on　Integrated　Recurrence　Behaviors　of　Strong　Earthquakes　Along　Entire　Active　Fault　Zones　in　the　Sichuan-Yunnan　Region,　China     

Yi Guixi  Wen Xueze  Xu Xiwei 《中国地震研究》2003,17(2):145-159

Based on historical earthquake data, we use statistical methods to study integrated recurrence behaviors of strong earthquakes along 7 selected active fault zones in the Sichuan-Yunnan region. The results show that recurrences of strong earthquakes in the 7 fault zones display near-random, random and clustering behaviors. The recurrence processes are never quasiperiodic, and are neither strength-time nor time-strength dependent. The more independent segments for strong earthquake rupturing a fault zone has, the more complicated the corresponding recurrence process is. And relatively active periods and quiescent periods for earthquake activity occur alternatively. Within the active periods, the distribution of recurrence time intervals between earthquakes has relatively large discretion, and can be modelled well by a Weibull distribution. The time distribution of the quiescent periods has relatively small discretion, and can be approximately described by some distributions as the normal. Both the durations of the active periods and the numbers of strong earthquakes within the active periods vary obviously cycle by cycle, leading to the relatively active periods having never repeated quasi-periodically. Therefore, the probabilistic assessment for middle- and longterm seismic hazard for entireties of active fault zones based on data of historical strong earthquakes on the fault zones still faces difficulty.  相似文献   

阿富汗发现史上最大稀土矿     

张殿刚 《地球》2011,(11):46-47

9月14日,美国地质勘探局的官网发布了一则消息称,该局在阿富汗南部赫尔曼德省的汗奈欣死火山下发现了一个稀土矿。矿区面积约0．74平方公里,据估计,稀土储量至少100万吨,这可能是史上最大的一处稀土矿藏,预计储量足够供全球10年所需。  相似文献   

江西省龙南县汤湖地热资源浅析     

尹祝  李康东 《火山地质与矿产》2011,(3):207-217

江西省龙南县汤湖地热田地表热水温度62～72°C,涌水量3095m^3／d。热水中偏硅酸、锂、锶、氟及氡含量较高,微硫化氢气味,无生物、化学污染,可用于采暖、医疗、洗浴。  相似文献