中天山地块暗色岩墙LA-ICP-MS锆石U-Pb年龄和岩石地球化学特征

中天山地块发育有大量的暗色岩墙,主要走向为北北西。对中天山暗色岩墙进行LA-ICP-MS锆石U-Pb测年,获得的年龄为304.8±1.5Ma,表明其形成于晚石炭世。这些暗色岩墙具有较高的SiO2,较低的Mg、Cr、Ni含量。它们富集大离子亲石元素（Rb、Ba、Th）,亏损高场强元素（Nb、Ta、Ti）,显示俯冲相关特征。上述特征暗示,中天山暗色岩墙可能是由俯冲板片流体交代的地幔楔部分熔融形成的。这一发现表明,准噶尔洋的闭合应该发生在晚石炭世之后。     

江苏镇江地区主要活动断裂及其晚第四纪活动性研究

镇江地区位于宁镇山脉东端,地质构造复杂,尤其断裂构造的活动性塑造了镇江地区如今的地形地貌格架。通过地质地貌调查、遥感影像解译、地球物理勘探、钻探、探槽等勘探手段,对镇江地区断裂构造两侧第四纪地层进行年代学研究,基本确定了断裂构造的活动机制、活动时间,结合镇江地区地震发生的规律及地应力场特征的研究,认为镇江地区断裂构造的最后活动时间在更新世,全新世活动较弱,并趋于稳定。      

利用正弦分段法模拟气温日变化

提出了一种运用正弦分段模拟法模拟气温日变化的新方法,并以山东省德州、菏泽、泰安、烟台、潍坊和青岛6个地面气象站2009年春、夏、秋、冬不同时段内一个月的自动观测逐时气温,与运用正弦分段模拟法模拟的逐时气温进行比较分析。结果表明,模拟气温与观测气温之间呈显著相关;该方法可以实现传统观测气温与自动观测气温的衔接以及满足作物模型对气温输入时间步长的精度要求;无论从空间或时间上,模拟气温与观测气温偏差及其变幅基本能满足应用需要。     

COMPARISON OF AEROSOL CHARACTERISTICS OVER MAINLAND OF CHINA AND WESTERN PACIFIC AND ITS LONG-RANGE TRANSPORT

Based on the aerosol data obtained at Shangdianzi regional background monitoring station together withthe air trajectory analysis,the chemical constituents of the aerosol from the different sources are discussed andcompared with the aerosol samples collected over the western Pacific.The results show that the relative massconcentrations of the crustal and pollutant elements in the aerosol collected over the ocean are higher than thosebeing observed at Shangdianzi in particle size above 4.7 μm and below 0.65μm in diameter.The variationsof the enrichment factors of these elements in marine aerosol with particle size are different from those in shang-dianzi's samples.The former enrichment factors are evidently higher than the latter above 1.1 μm in diameter.On the basis of the comparative research,the long-range transport processes of aerosol particles are discussed.     

安徽巢湖凤凰山晚古生代大冰期沉积特征与碳同位素变化

地史中海相碳酸盐岩记录的无机碳同位素的波动经常与全球气候事件相互关联,但碳酸盐岩的碳同位素不仅与全球碳循环相关,也受控于区域水循环和成岩作用.晚古生代大冰期在石炭纪末—早二叠世达到最高峰,南方冈瓦纳大陆高纬度地区冰川的进退引起低纬度地区旋回性的海平面变化,并发育显著的沉积间断,在华南表现为喀斯特岩溶角砾岩等.本文选取安...     

正常震群和前兆震群的判定指标

本文采用大森公式ｎ（ｔ）＝Ｋ／（ｔ＋ｃ）＾ｐ求解Ｋ、ｃ、ｐ三个参数，对云南１９６５年以来７１个地震序列进行研究。确定Ｐ＝０．８为前兆震群和正常震群的判定指标。利用Ｋ、ｃ、ｐ三参数计算序列理论曲线得到晚期强余震前差残曲线超出两倍均方差的结果。     

On the transplantation and cultivation ofKappaphycus alvarezii in China

A 2-year study onKappaphycus alvarezii (Doty) Doty introduced to Hainan Island from the Philippines in 1985 showed promising results. The average daily growth in weight reached 10% at a favourable temperature of about 26°C. Experimental results showed that timely cutting of the plant was an effective way to obtain new cuttings for cultivation and accelerate growth. New cuttings 0.05 kg in weight are suggested to be used as “seeds” and the old plant should be harvested. At present, artificial cultivation with a type of underwater raft applicable in places where there is strong wind will expand cultivation to more regions in Hainan Province. This paper was originally published in Chinese inOceanologia et Limnologia Sinica 19(5): 410–418, 1988. The plant under discussion wasEucheuma alvarezii Doty which was previously calledE. striatum in the article, and which now becomesKappaphycus alvarezii (Doty) Doty. To the original title, “in China” was added. Only the essence of the original article was presented.     

A study on the effects of soil moisture,air humidity,and air temperature on wind speed threshold for dust emissions in the Taklimakan Desert

Natural Hazards - Soil and the atmospheric conditions are important factors that affect wind speed threshold of surface dust emissions. Based on the observed data of surface dust emissions in the...     

三山岛金矿矿柱的稳定分析

本文基于三山岛金矿工程地质条件,针对设计所提出的采场和矿柱的尺寸,提出了分析矿柱稳定性的一种新的方法,并应用该方法分析了矿柱的稳定性;同时,提出了提高矿柱承载能力的一种有效途径。另外,还详细讨论了矿柱顶点的深度与长度之间存在的关系。