Three Stages of Zircon Growth in Magmatic Rocks from the Pingtan Complex, Eastern China

Morphological and chemical studies on zircon grains from gabbro and granite of the Pingtan magmatic complex, Fujian Province, eastern China, show that there are three stages of zircon growth. The early stage of zircon growth is characterized by colorlessness, high transparence and birefringence, low and dispersive Ipr and Ipy, weak and homogeneous BSE brightness, lower Hf content and depletion of U, Th and Y; the middle stage is characterized by abruptly increasing lpy, progressively strong and sectoral-zoning BSE brightness, higher Hf content and enrichment of U, Th and Y with Th/U 〉 1; the late stage of growth is characterized by brownish color, poor transparence, low birefringence, highest Ipr and Ipy, middle and oscillatorily-zoning BSE brightness, highest contents of Hf, U and Y with Th/U 〈 1. The stages are considered to be formed in a deep magma chamber, ascent passage and emplacement site, respectively. Due to the more or less long residual time of the magma chamber, the difference in age between the early and late stages of zircon might be great enough to be distinguished, which can be attributed to tectonic constraint for the magnlatism.     

Effects of nitrogen nutritional stress on the morphological and yield parameters of tomato (Solanum lycopersicum L.)

This investigation was carried out to better understand the effects of nitrogen stress on the growth and yield of tomato(Solanum lycopersicon L.). Seeds of S. lycopersicon(Ife No. 1 variety) were collected from the Osun–State Ministry of Agriculture, Oshogbo, Nigeria and planted in analyzed top soil. The plants were grown for a period of five weeks within which they were supplied with water and kept under optimum environmental conditions that enhanced normal growth. After this period, the plants were subjected to different levels of nitrogen stress which include: plants supplied with distilled water only(n), plants supplied with complete nutrient solution(N), plants supplied with nutrient solution in which nitrogen concentration sources was increased by a factor of 5(N5), and plants supplied with nutrient solution in which nitrogen concentration sources was increased by a factor of 10(N10). Analysis of Variance(ANOVA) results shows that there is no significant effect of stress on the growth and morphological parameters of tomato plants. However, there was a significant effect of nitrogen stress on the yield parameters. Nitrogen stress also caused an increase in the number and size of fruits produced in plants subjected with high nitrogen concentration.     

A Novel Approach in Hydrogeochemical Exploration for Uranium Mineralization: an Example from West Central Sinai, Egypt

Groundwater in contact with ore deposits may acquire a chemical composition that could be used as a guide for exploration. Eight well-water samples are collected from a known uranium-mineralized area near Abu Zenima, west central Sinai to examine the applicability of using the hydrogeochemical technique in the search for uranium mineralization in similar arid areas. The analytical chemical data of the ground water is compared with ground radiometric measurements. The obtained results indicate that groundwater affected by uranium mineralization has a specific relativity of major anions expressed essentially as SO4>Cl>HCO3 and to a lesser extent as Cl>SO4>HCO3, associated as a rule with low magnesium content. This association constitutes a signature of uranium mineralization on the composition of groundwater in west central Sinai and could be used as an important exploration guide in the search for uranium deposits in similar areas. Anomalies in Ni, Fe, Zn and Cr and other pathfinder elements in groundwater can furnish geochemical guides to uranium ores. The immobile trace element anomalies, including Zn, Ni and Fe are strongly distributed near the orebody; whereas the relatively mobile trace elements, including Co, U, V and Cr, constitute the dispersion haloes away from the orebody. A new hydrogeochemical discrimination diagram is constructed to be used as a quick and cost effective exploration tool in the search for uranium occurrences in environmentally similar arid areas. Based on the obtained results, a new site for uranium occurrence, west of W. Baba, is delineated and recommended for future detailed geological and geochemical surveying.     

大气层臭氧损耗与紫外辐射对海洋浮游植物的影响

人类活动产生的氟氯烃等化合物对大气的污染造成臭氧损耗 ,引起地面紫外辐射 ( UV-B)增加 ,进而造成对生物的有害影响。根据作者近年来的研究和国际上的相关研究进展 ,本文就“臭氧洞”形成和紫外辐射增加对海洋浮游植物影响的关键所在 ,即紫外辐射对海洋浮游植物的生化效应 ,包括海洋生物对 UV- B的忍耐性和抵御能力、UV- B对海洋浮游植物细胞内、外生化环境的影响等 ,作一综述。     

Iberan黄铁矿带的Tharsis矿山硫化物矿床的沉积构造

Ｔｈａｒｓｉｓ矿区是Ｉｂｅｒｉａｎ黄铁矿带中最大的成矿中心之一。它包括了Ｉｂｅｒｉａｎ半岛西南的广大地区。对Ｔｈａｒｓｉｓ矿山Ｆｉｌｏ Ｎｏｔｖｔｅ硫化物矿床中的沉积构造进行了野外和显微镜下的研究。以内部构造为依据，把硫化矿床分为两类：（１）致密块状黄铁矿矿石；（２）具有沉积构造的黄铁矿石。在后一种类型中，已观察到若干沉积构造，例如：序粒层理、平行纹理、交错纹理及滑塌构造。     

FOOD CONSUMPTION AND NUTRITION IN RURAL AREAS OF MADHYA PRADESH, INDIA (WITH SPECIAL REFERENCE TO SAGAR DIVISION)

Ｉ.ＴｈｅＳｔｕｄｙＡｒｅａ:ＳａｇａｒＤｉｖｉｓｉｏｎＳａｇａｒｄｉｖｉｓｉｏｎｌｉｅｓｉｎｔｈｅｎｏｒｔｈｃｅｎｔｒａｌｐａｒｔｏｆＭａｄｈｙａＰｒａｄｅｓｈｂｅｔｗｅｅｎ23°10′ａｎｄ26°35′Ｎｌａｔｉｔｕｄｅｓａｎｄ78°04ａｎｄ80°38′Ｅｌｏｎｇｉｔｕｄｅｓ.Ｔｈｅｇｅｏｇｒａｐｈｉｃａｌａｒｅｓｉｓ38223ｋｍ2ｗｈｉｃｈｉｓｓｂｏｕｔ8.65ｐｅｒｃｅｎｔｏｆｔｈｅＳｔａｔｅ.ＴｈｅＳａｇａｒａｄｍｉｎｉｓｔｒａｔｉｖｅｄｉｖｉｓｉｏｎｃｏｎｓｉｓｔｓｏｆｆｉｖｅｄｉｓｔｒｉｃｔｓｖｉｚ.Ｓａｇ…     

MASINGA RESERVOIR IN KENYA：SEDIMENT DISCHARGE AND IMPLICATIONS FOR ITS CAPACITY

ＭＡＳＩＮＧＡＲＥＳＥＲＶＯＩＲＩＮＫＥＮＹＡ：ＳＥＤＩＭＥＮＴＤＩＳＣＨＡＲＧＥＡＮＤＩＭＰＬＩＣＡＴＩＯＮＳＦＯＲＩＴＳＣＡＰＡＣＩＴＹ￥Ｆ．Ａ．Ｏ．Ｏｔｉｅｎｏ（ＳｅｎｉｏｒＬｅｃｔｕｒｅｒｉｎＣｉｖｉｌＥｎｇｉｎｅｅｒｉｎｇ，Ｕｎｉｖｅｒｓｉ...     

THE ADVERSE IMPACT OF HUMAN ACTIVITIES ON FLOOD CONTROL IN THE HUAIHE BASIN

LIN~DUCnONTheHuaiheBasinislOCatedbetWeen31"-36"llorthemlahtudeand112"-121"easternlongitude,andcoversatotalareaofabout269,000sq.kin,OfwhichthemountainousandhillyareasocCUPyl/3,theplainsandlow-iringland2/3.ThebasinelicitSsalientphysicalgeographicalfeatllTesasfollowsf(l)Thereisnoobviousmountaindividebe~ntheWatershedoftheriVerandtheYellowforerBasinaswellastheYangtZeRadBasin.MostofthetributariesinthenoalbudoftheHuaiheforertakethesouthdikesOftheYellowherasthedivide.(2)TheriVerbedofthetr…