安徽长山地热初探   总被引：1，自引：1，他引：0  

宁金野  徐洪苗 《安徽地质》2008,18(2):124-128

合肥盆地西界长山隆起,位于安徽省霍邱县西北。地壳减薄上地幔隆起是地热形成的地质背景,适当厚的高热阻盖层和高热导率的基底相配置是地热形成的基本原因。两条导水断裂是良好的导热通道,至使长山地热-400m地温达40℃以上,地温梯度达4．27℃／100m～5．46℃／100m,安徽长山地热是基底隆起聚热型,若科学合理勘探开发,将会给皖西地区带来十分可观的经济和社会效益,同时对省会经济圈建设和大别山地质公园旅游业发展意义重大。  相似文献   

Variations in the transient prograde geothermal gradient from chloritoid-staurolite equilibria: a case study from the Barrovian and Buchan-type domains in the Bohemian Massif   总被引：1，自引：0，他引：1  

M. KO&#;ULI&#;OVÁ  P. &#;TÍPSKÁ 《Journal of Metamorphic Geology》2007,25(1):19-36

Thermodynamic modelling of metamorphic rocks increases the possibilities of deciphering prograde paths that provide important insights into early orogenic evolution. It is shown that the chloritoid–staurolite transition is not only an indicator of temperature on prograde P–T paths, but also a useful indicator of pressure. The approach is applied to the Moravo‐Silesian eastern external belt of the Bohemian Massif, where metamorphic zones range from biotite to staurolite‐sillimanite. In the staurolite zone, inclusions of chloritoid occur in garnet cores, while staurolite is included at garnet rims and is widespread in the matrix. Chloritoid X_Fe = 0.91 indicates transition to staurolite at 5 kbar and 550 °C and consequently, an early transient prograde geothermal gradient of 29 °C km^?1. The overall elevated thermal evolution is then reflected in the prograde transition of staurolite to sillimanite and in the achievement of peak temperature of 660 °C at a relatively low pressure of 6.5 kbar. To the south and to the west of the studied area, high‐grade metamorphic zones record a prograde path evolution from staurolite to kyanite and development of sillimanite on decompression. Transition of chloritoid to staurolite was reported in two places, with chloritoid X_Fe = 0.75–0.80, occurring at 8–10 kbar and 560–580 °C, and indicating a transient prograde geothermal gradient of 16–18 °C km^?1. These data show variable barric evolutions along strike and across the Moravo‐Silesian domain. Elevated prograde geothermal gradient coincides with areas of Devonian sedimentation and volcanism, and syn‐ to late Carboniferous intrusions. Therefore, we interpret it as a result of heat inherited from Devonian rifting, further fuelled by syntectonic Carboniferous intrusions.  相似文献   

中国东部岩石圈热状态与流变学强度特征   总被引：10，自引：1，他引：9  

汪洋  程素华 《大地构造与成矿学》2011,35(1):12-23

根据均衡原理制约的地热计算得到中国东部岩石圈的温度分布状态,以40、70、100km和莫霍面深度等温线图以及600°C、1100°C等温面深度的形式表示.同时计算了以1350°C等温面深度表示的中国东部的热岩石圈厚度.结果显示:在扬子克拉通西部四川盆地之下存在160～200km厚的岩石圈根,但在整个华北克拉通之下缺失岩...  相似文献   

蚀变洋壳玄武岩俯冲过程中含碳矿物相变质演化及脱碳作用的研究     

朱建江  张立飞  吕增 《岩石矿物学杂志》2018,37(3):404-416

俯冲作用是连接地表系统和地球深部系统的最为关键的地质过程,其对研究地球深部碳循环具有重要的意义。俯冲洋壳岩石圈中的碳主要存储在沉积物、蚀变洋壳玄武岩以及蛇纹岩中。俯冲变质作用过程含碳岩石的变质演化控制着其中含碳矿物相的转变及碳迁移过程。本文选取了蚀变洋壳玄武岩进行相平衡模拟,来研究其含碳矿物相的变质演化过程。计算结果表明,变质玄武岩体系中的碳酸盐矿物之间的转变反应除了受压力控制之外,还受到温度和体系中铁含量的影响。随着压力的升高蚀变玄武岩中碳酸盐矿物会发生方解石/文石-白云石-菱镁矿的转变,但在高压/超高压条件下,温度的升高可以使菱镁矿转变成白云石。碳酸盐矿物中的铁含量受到体系中铁含量的影响,白云石和菱镁矿中的铁含量随着体系中铁含量的增加而增加。在水不饱和条件下,洋壳不管是沿着低温还是高温地热梯度线俯冲到岛弧深度,蚀变玄武岩体系几乎都不发生脱碳作用。然而在水饱和条件下,当洋壳沿着高温以及哥斯达黎加地热梯度线俯冲到岛弧深度时,蚀变玄武岩体系中的碳几乎可以全部脱出去。蚀变玄武岩体系中水含量的增加可以促进体系的脱碳作用。  相似文献   

从地球物理勘探成果探讨嘉峪关断裂与酒东盆地对地热资源的控制          下载免费PDF全文

何海军  李百祥 《甘肃地质》2014,23(3):61-66

酒东盆地是典型挤压造山型盆地,嘉峪关断裂是第四纪活动断裂,具有储热导热良好的地热地质条件,虽地温场偏低于东部裂谷型盆地,在以往石油勘探和水文地质普查中已发现有地下热水存在。嘉峪关市区一带通过石油普查重力、直流电测深资料重新解释,结合以往石油地震勘探和钻探成果,认为嘉峪关—酒泉凹陷具备地热资源形成的储、盖、通、源条件,属中低温盆地传导型地热资源,具有经济开发价值。  相似文献   

Thermal State and Strength of the Lithosphere Beneath the Chinese Mainland   总被引：1，自引：0，他引：1  

WANG Yang 《《地质学报》英文版》2012,86(4):810-827

The temperature distributions of the lithosphere underneath the mainland of China were estimated by applying local isostatic equilibrium-constrained geothermal calculations. Maps of the lateral temperature variation at depths of 40, 70, and 100 km are presented for the whole Chinese continent, with the thermal thickness of the lithosphere is calculated. Lithospheric roots of 160–200 km thickness underlie Tarim and the Upper Yangtze platform, but are absent beneath the entire Sino-Korean platform. In general, the Tibetan plateau and fold belts to the north have warm but thick lithospheres, whereas thinner thermal lithospheres have been identified in northern Tibet and central Tian Shan around Issyk-Kul Lake. The warm and soft lithosphere in the Tibetan plateau and Tian Shan are caused by uniform north–south shortening, which may represent a snapshot of the early stage of convective thinning of the convergent lithosphere. However, the lithospheric thinning beneath northeastern China might be related to volatile infiltration by dehydration of the deeply subducting Pacific slab during the Cenozoic. Dry and wet upper mantle rheology display “jelly sandwich” and “crème br?lée” pictures, respectively, demonstrating the mechanical behaviour of the Chinese lithosphere outside the Tibetan plateau. Considering a more geologically evident wet-mantle rheology, the “crème br?lée” model can approximate the lithospheric rheology for the most earthquake-prone regions on the Chinese mainland.  相似文献   

安庆市地热水资源分布特征与开发利用初步研究     

程长根  杨立本 《安徽地质》2005,15(3):186-189,192

通过对安庆地热水形成的机制,地热水分布特征的分析,对地热水资源的勘探、开发、与管理、提出了见解,对地热水资源在安庆市经济发展中的作用,提出了合理建议.  相似文献   

重力方法在太原南部地热开发中的应用     

缪旭煌  陆大进 《江苏地质》2019,43(3):415-420

物探方法于已广泛应用地热能资源开发。太原南部地热开发方式是利用深部地热资源进行循环水供热,因田庄断裂垂向断距＞1 500 m,是影响太原南部地热资源分布的重要因素,其下降盘含热层深度＞4 000 m,开发成本极高,因此需要利用地球物理方法查明断层位置及走向。在城市进行物探工作,方法选择是需要考虑的关键因素之一,因此选取以重力为主、地震方法或CSAMT方法验证的方案。田庄断裂较为陡立,利用经2个已知孔剖面的重力水平一阶导数求取上断点位置,再利用剖面追踪布设方式确定断裂走向,结合CSAMT方法及已知钻孔资料综合拟合新生界覆盖层厚度。结果表明：田庄断裂由北东东向转北东向,田庄村东侧发现断裂错位,且方向发生改变;研究区东北—西南方向,沿田庄断裂覆盖层厚度逐渐增大。断裂位置及新生界厚度得到了西-GXWL探-1孔及后期施工钻孔的验证。  相似文献   

Seismic Velocity Structure and Composition of the Continental Crust of Eastern China     

WANG Yang  CAO Jiamin  ZHU Jieshou Guangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou  Guangdong  School of Earth Sciences  Resources  China University of Geosciences  Beijing Department of Geophysics  Chengdu University of Technology  Chengdu  Sichuan 《《地质学报》英文版》2004,78(1):291-297

On the basis of a one-by-one latitude-longitude grid three-dimensional seismic velocity model, the crustal P-wave velocity structure in eastern China (105-125°E and 18-41°N) is obtained, and a set of geotherms for each grid is established for P-T correction on P-wave velocities. The average depths of sub-crustal layers and their average P-wave velocities of 18 tectonic units in eastern China are exhibited. Our result presents a 32-34 km thick crust beneath eastern China, which is thinner than previous studies, with an average velocity of 6.54 km/s, corresponding to a 5 kg/m3 variation in crustal mean density. The thicker upper but thinner middle and lower crust results in a lower average seismic velocity of eastern China. An intermediate crustal composition with a SiO2 content of 59.7 wt% has been estimated. However, there exists a significant lateral variation in the crustal structures among the tectonic units of eastern China. The structure and composition features of some regions in eastern China in  相似文献   

河南省地热勘探开发的形势与任务     

郭新华  阎书跃 《河南国土资源》1999,(3)

河南省地热勘探与开发经过20年来地热工作者不懈努力,在平原地区广泛分布的上第三系中找到了低温热储和丰富的地热资源,以城市为中心的地热开发初具规模,全省相继建起了集旅游、娱乐、保健、餐饮于一体的温泉中心近十处,给城乡居民带来了丰富多彩的生活。但与全国相比,我省地热地质工作滞后,资源不清,开发技术落后,地热能用途单一,效益低下,管理跟不上。我国地热开发正在走向地热产业化,面对咄咄逼人的形势、资源和环境的挑战,地热勘探开发必须奋起赶上,加强基础研究投入,引进先进的开发技术,培育地热供暖市场,加强规划和管理,提高资源效益。  相似文献