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51.
车田湾地热田地质地球物理特征及开发前景 总被引:1,自引:0,他引:1
车田湾地热田属低温地热资源。热泉分布受SN向压扭性深大断裂(F2)与近EW向张性断裂的复合控制,其断层破碎带为硅化脉充填,表现为高阻地电特征。应用电测深法可以确定其断层破碎带产出位置和延伸方向。用钾镁地热温标计算热田地表温度,用钾钠地热温标计算热田深部温度。根据温度随深度而递增的规律,应用温度-深度曲线方法推算地下某深度的水温,从而可合理开发利用地热资源。 相似文献
52.
Fu Xiaofeng Department of Urban Resource Sciences Nanjing University Nanjing People''s Republic of China 《地理学报(英文版)》1997,(2)
I.IntroductionInextremelyaridareaswherearidityishigherthan16.0,themaintenanceanddevelopmentofregionaloasiseconomyhavebeenrestrictedbytheutilizationandallotmentofwaterresource.Thus,itissignificantlyimportanttoexplore,onthebasisofwaterresource,thedevelopmen… 相似文献
53.
本文对西南极菲尔德斯形变网GPS监测数据的误差特性进行分析,利用数理统计原理检验了数据中的系统误差,提出了削弱这类系统误差的方法。该方法有3个特点:1.以监测网中两个稳定点为基准;2.对监测网数据进行尺度因子改正与坐标变换迭代计算;3.归算后监测网点位结构不变。经改化处理后的数据,基本上消除了系统误差的影响。 相似文献
54.
乌兰布和沙漠东北边缘植物群落物种多样性及其生态环境 总被引:7,自引:3,他引:7
应用群落多样性指数(D)、均匀度(J)、生态优势度(C)等指标,对乌兰布和沙漠东北边缘不同生境(荒漠区、绿洲外围、绿洲内)的天然植物群落进行了研究,结果表明这三种指标值能有效地表征群落的组成结构特征及生境的优劣;荒漠植物群落多样性指数(D=0.603~2.984)和均匀度(J=0.337~0.691)都较低,而生态优势度(C=0.724~0.195)较高,说明荒漠植被生态环境的脆弱性,群落结构越复杂,多样性指数越高;多样性与生态环境关系密切,D和J随生境渐好而递增,C随生境渐好而递减,可作为环境评价指标;多样性在一定程度上体现了群落的发展阶段和稳定程度,越接近顶级阶段,多样性越高,且环境的改善有助于群落演替进程的加速;干旱区弃耕撩荒地次生演替植被,在弃耕初期多样性随弃耕年限增大而减小,后期处于一个较稳定的水平,且各演替阶段植物组成变化较大。 相似文献
55.
56.
地矿部吉林地勘避自八十年代初开始推向地质市场,迄今已十多年,服务领域日益扩大,但根据当前市场发展的趋向,必须走视规模经营的路子,引进,更新技术装备,扩大工程市场的服务功能和占有率,才能获得更大的经济效益。 相似文献
57.
In this paper, the process of oasis-desert circulation (ODC) is simulated by MM5V3.5 model through designing an ideal oasis-desert scheme and assuming that initial atmosphere is at rest (V = 0). The findings showed that the key of forming special oasis boundary structure is the difference of energy and water between oasis and desert. The evaporation of oasis surface consumes heat energy, and the low temperature of oasis causes an oasis breeze circulation (OBC), which drives an ODC with a downdraft over the oasis and an updraft over the desert. Later, the cold, dry and stable boundary over oasis is gradually formed, on the contrary,the atmospheric boundary over desert on the edge of oasis is hot, humid and unstable and its height is about 600 hPa. The updraft over the desert forms a wet ring that acts as a vertical wall weakening the low-level moisture exchange between the oasis and desert. The downdraft of OBC increases the atmospheric stability that reduces the oasis evaporation. The low-level outflow from the oasis (into the desert) prevents the dry, hot air flowing from the desert into the oasis.Thus an oasis self-preservation mechanism may be formed due to OBC. The horizontal area influenced by oasis is twice as oasis area and the vertical range is four times as oasis. The ODC is strong in the daytime and reaches the strongest at 17:00, and the influenced area is the largest at 20:00. 相似文献
58.
Similarities between strike-slip faults at different scales and a simple age determining method for active faults 总被引:1,自引:0,他引:1
Abstract Several differently scaled strike‐slip faults were examined. The faults shared many geometric features, such as secondary fractures and linkage structures (damage zones). Differences in fault style were not related to specific scale ranges. However, it was recognized that differences in style may occur in different tectonic settings (e.g. dilational/contractional relays or wall/linkage/tip zones), different locations along the master fault or different fault evolution stages. Fractal dimensions were compared for two faults (Gozo and San Andreas), which supports the idea of self‐similarity. Fractal dimensions for traces of faults and fractures of damage zones were higher (D ~1.35) than for the main fault traces (D ~1.005) because of increased complexity due to secondary faults and fractures. Based on the statistical analysis of another fault evolution study, single event movements in earthquake faults typically have a maximum earthquake slip : rupture length ratio of approximately 10?4, although this has only been established for large earthquake faults because of limited data. Most geological faults have a much higher maximum cumulative displacement : fault length ratio; that is, approximately 10?2 to 10?1 (e.g. Gozo, ~10?2; San Andreas, ~10?1). The final cumulative displacement on a fault is produced by accumulation of slip along ruptures. Hence, using the available information from earthquake faults, such as earthquake slip, recurrence interval, maximum cumulative displacement and fault length, the approximate age of active faults can be estimated. The lower limit of estimated active fault age is expressed with maximum cumulative displacement, earthquake slip and recurrence interval as T ? (dmax /u) · I(M). 相似文献
59.
We present new 40Ar/39Ar data for sanidine and biotite derived from volcanic ash layers that are intercalated in Pliocene and late Miocene astronomically dated sequences in the Mediterranean with the aim to solve existing inconsistencies in the intercalibration between the two independent absolute dating methods. 40Ar/39Ar sanidine ages are systematically younger by 0.7-2.3% than the astronomical ages for the same ash layers. The significance of the discrepancy disappears except for the upper Ptolemais ashes, which reveal the largest difference, if an improved full error propagation method is applied to calculate the absolute error in the 40Ar/39Ar ages. The total variance is dominated by that of the activity of the decay of 40K to 40Ar (∼70%) and that the amount of radiogenic 40Arp in the primary standard GA1550 biotite (∼15%). If the 40Ar/39Ar ages are calculated relative to an astronomically dated standard, the influence of these parameters is greatly reduced, resulting in a more reliable age and in a significant reduction of the error in 40Ar/39Ar dating.Astronomically calibrated ages for Taylor Creek Rhyolite (TCR) and Fish Canyon Tuff (FCT) sanidine are 28.53±0.02 and 28.21±0.04 Ma (±1 S.E.), respectively, if we start from the more reliable results of the Cretan A1 ash layer. The most likely explanation for the large discrepancy found for the younger Ptolemais ash layers (equivalent to FCT of 28.61 Ma) is an error in the tuning of this part of the sequence. 相似文献
60.