张掖绿洲“冷岛效应”对大气扩散的影响   总被引：2，自引：0，他引：2  

柳艳香 《高原气象》1993,12(1):77-83

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海温作用与低频振荡          下载免费PDF全文

刘式适  庄瑞宁 《热带气象学报》1993,9(1):65-70

提出一个求定常方程平衡数值解的方法,并利用这个方法求得了雷州半岛海风环流的稳定数值解,在一定下边界强迫下得到了和观侧相一致的环流状态,进而讨论了大气参数对海风环流的影响,试验表明,所提出的求解方法是有效的.  相似文献   

A kinematic model for evolution of island arc-trench systems   总被引：1，自引：0，他引：1  

Toshinori Sato  Mitsuhiro Matsu'ura 《Geophysical Journal International》1993,114(3):512-530

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Large-scale deformation associated with ridge subduction   总被引：1，自引：0，他引：1  

Eric L. Geist  Michael A. Fisher  David W. Scholl 《Geophysical Journal International》1993,115(2):344-366

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伊通县放牛沟地区早古生代岩浆演化特征及其与矿产关系   总被引：1，自引：0，他引：1  

贾大成 《吉林地质》1990,9(2):49-56

伊通县放牛沟早古生代岩浆活动较为强烈,其发展演化与放牛沟多金属硫化物矿床关系极为密切。岩浆活动特点是先喷发后侵入,先期形成钙碱系列的火山—沉积岩系,后期为Ⅰ型中酸性岩浆侵入。该矿床既有火山沉积特征,又有后期岩浆热动力改造特点,其形成受控于岛弧构造环境、火山活动形成的矿源层、后期热动力改造等因素。  相似文献   

Metamorphism and granite genesis in the Hidaka Metamorphic Belt, Hokkaido, Japan   总被引：3，自引：0，他引：3  

Y. OSANAI  M. KOMATSU  M. OWADA 《Journal of Metamorphic Geology》1991,9(2):111-124

The Main Zone of the Hidaka Metamorphic Belt is an uplifted crustal section of island-arc type. The crust was formed during early Tertiary time, as a result of collision between two arc–trench systems of Cretaceous age. The crustal metamorphic sequence is divided into four metamorphic zones (I–IV), in which zone IV is in the granulite facies. A detailed study of the evolution of the Hidaka Belt, based on a revised P–T–t analysis of the metamorphic rocks, notably a newly found staurolite-bearing granulite, confirms a prograde isobaric heating path, after a supposed event of tectonic thickening of accretionary sedimentary and oceanic crustal rocks. During the peak metamorphic event (c. 53 Ma), the regional geothermal gradient attained 33–40° C km^?1, and the highest P–T condition obtained from the lowest part of the granulite unit is 830° C, 7 kbar. In this part, X_H2O of Gt–Opx–Cd gneiss is about 0.15 and that of Gt–Cd–Bt gneiss is 0.4. The P–T–X_H2O condition of the granulite unit is well within a field where fluid-present partial melting of pelitic and greywacke metamorphic rocks takes place. This is in harmony with the restitic nature of the Gt–Opx–Cd gneiss in the lowest part of the granulite unit. The possibility that partial melting took place in the Main Zone is significant for the genesis of the peraluminous (S-type) granitic rocks within it. The S-type granitic rocks in this zone are Opx–Gt–Bt tonalite in the granulite zone, Gt–Cd–Bt tonalite in the amphibolite zone, and Cd–Bt–Mus tonalite in the Bt–Mus gneiss zone. The mineralogical and chemical nature of these strongly peraluminous tonalitic rocks permit them to be regarded as having been derived from S-type granitic magma generated by crustal anatexis of pelitic metamorphic rocks in deeper crust.  相似文献   

白乃庙金矿床构造特征     

曾庆栋 《吉林地质》1991,10(1):65-70

白乃庙金矿床矿体围岩有白乃庙群绿片岩和长英片岩、石英闪长岩和斜长花岗岩等。矿床构造专题研究表明,控矿构造是白乃庙断层和次级断裂组成的帚状构造,并在断层交汇部位形成富矿柱。  相似文献   

皖南蛇绿岩的初步研究   总被引：4，自引：0，他引：4  

叶德隆  邓晋福 《地球科学》1991,16(2):143-152,T001

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黑河地区绿洲和戈壁小气候特征的季节变化及其对比分析   总被引：20，自引：23，他引：20  

左洪超  胡隐樵 《高原气象》1994,13(3):246-256

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移动性热岛边界层特征的数值研究     

陈万隆  周一德 《南京气象学院学报》1994,17(2):188-194

用二维非静力完全弹性的中－γ尺度数值模式模拟了移动性热岛的大气边界层特征。试验中，热岛移速取为４ｍ·ｓ＾－１，热岛强度取△θｇ＝６０Ｋ和３０Ｋ两种。△θｇ＝６０Ｋ时，在热岛后方出现了强烈的垂直运动并形成了水平尺度为３－５ｋｍ的局地环流，最大上升速度１００ｃｍ·ｓ＾－１，出现在低层３００－４００ｍ高度；△θｇ＝３０Ｋ时，移动热岛的边界效应比前大为减弱，且不再出现闭合的局地环流。  相似文献