Chemical characteristics of four kinds of water in the rongbuk glacier basin, Mount Qomolangma

ＤｕｒｉｎｇｔｈｅｔｈｒｅｅＭｔ．ＱｏｍｏｌａｎｇｍａＥｘｐｅｄｉｔｉｏｎｓｏｆ１９５９－１９６０,１９６６－１９６８ａｎｄ１９７５,ＣｈｉｎｅｓｅｓｃｉｅｎｔｉｓｔｓｈａｄｏｂｔａｉｎｅｄｍａｎｙｄａｔａｏｆｇｌａｃｉｅｒｓｉｎｔｈｅｄｉｓｔｒｉｃｔｏｆＭｔ．Ｑｏｍｏｌａｎｇｍａ（Ｗａｎｇｅｔａｌ．,１９８０;Ｘｉｅｅｔａｌ．,１９７５;Ｚｈａｎｇｅｔａｌ．,１９７５）．ＩｎＭａｙ１９９７,Ｐｒｏｆ．ＱｉｎＤａｈｅａｎｄＰｒｏｆ．ＰａｕｌＡ．Ｍａｙｅｗｓｋｉｏｒｇａｎｉｚｅｄａｎｏｔｈｅ…     

Environmental significance of snowpit chemistry in the typical monsoonal temperate glacier region,Baishui glacier no. 1, Mt Yulong,China

Samples were collected from two snowpits in Baishui glacier no. 1, Mt Yulong, China, in May 2006. Snowpit chemistry was studied, using ion tracer techniques, HYSPLIT model, factor analysis, correlation and trend analysis. It indicated that total cation concentration is higher in 4,900-m snowpit than in 4,750-m snowpit, whereas total anion concentration is higher in 4,750-m snowpit. Cations, especially Ca²⁺, dominate ionic concentrations in Baishui glacier no. 1. According to correlation analysis and factor analysis, ions can be categorized as follows: Cl⁻ and NO₃ ⁻ as Group 1, SO₄ ²⁻ as Group 2, Mg²⁺ and Ca²⁺ as Group 3, Na⁺ as Group 4, K⁺ as Group 5. Contribution made by terrestrial dust to ionic concentration accounts for 52.27, 100, 99.36, 98.91, 96.16 and 99.97% of Cl⁻, NO₃ ⁻, SO₄ ²⁻, K⁺, Mg²⁺ and Ca²⁺, respectively, in 4,900-m snowpit, and for 64.00, 100, 99.57, 98.63, 96.25 and 99.97% in 4,750-m snowpit. Local dust is the principal source of snowpit chemical components. Pollutants brought from industrial areas of South Asia, Southeast Asia and South China by monsoonal circulation also makes some contribution to anion concentrations, but pollution associated with human activities makes a very slight contribution in study area. The chemical characteristics of two snowpits are different owing to the difference of deposition mechanism and local environment in different altitudes.     

五河县大巩山地区褶皱构造浅析

大巩山西蝈堆组蚌埠期褶皱可利用含白云质大理岩透镜体的蛇纹岩作为标志层来恢复,推测其为轴面倒向北的紧密同斜褶皱,S0近南北向,枢纽西倾,地层由东向西变新。     

大别山地区（安徽）中生代花岗岩类岩体特征与形成机制

根据详细填图和研究资料，对区内中生代花岗岩类侵入体的分布特点、岩石学、地球化学、同位素年代学等进行了较系统总结，并对花岗岩类的起源及形成演化、顶蚀一塌陷侵位机制，及其与火山活动关系等作了较深入分析，为探讨大别山热隆史提供了较充分的地质依据。     

STUDY ON THE ISOTOPIC CHRONOLOGY AND THE TECTONIC SIGNIFICANCE OF DUGUER GRANITIC GNEISS IN CENTRAL QIANGTANG, TIBET

STUDY ON THE ISOTOPIC CHRONOLOGY AND THE TECTONIC SIGNIFICANCE OF DUGUER GRANITIC GNEISS IN CENTRAL QIANGTANG, TIBET     

Recent 200 Years Climatic and Environmental Records From the Far East Rongbuk Ice Core, Mt. Qomolangma(Everest)

RECENT 200 YEARS CLIMATIC AND ENVIRONMENTAL RECORDS FROM THE FAR EAST RONGBUK ICE CORE, MT. QOMOLANGMA (EVEREST)     

A WIMP detector with two-phase xenon

We describe an important new technique to search for WIMPs. This technique employs a method of background discrimination using double phase xenon as detector target. We describe the construction of a two-phase, 1-kg xenon detector. The detector will be installed at the underground laboratory in the Mt. Blanc tunnel, which provides a low background rate. A comparison between the sensitivity curve of our detector and the theoretical events limit from SUSY calculations is presented.     

龙门山的石炭系

四川江油马角坝、北川沙窝子是龙门山上泥盆统、下石炭统区域性主要岩石地层单位的命名地,对这两地及前龙门山北段地区的调查发现:1)前人关于马角坝地区下石炭统的层序和马角坝组主要化石群的记载有与实际不符之处,当地实际缺失杜内期至维宪早、中期地层,总长沟群的时代应属晚维宪—谢尔普霍夫期,重新厘定马角坝组含义,新指定北川桂溪沙窝子的长滩子剖面为该组的参考剖面;2)在长滩子剖面长滩子组顶部Beichuano-phyllum与Cystophrentis珊瑚化石富集层之上、马角坝组Pseudouralinia富集层之下的大套厚层白云岩层组合的中上部层位,发现Cystophrentis等化石,基于这套厚层白云岩组合的岩性特征明显、顶底接触关系清楚、区域展布广泛,建议引用前人提出的黑岩窝组,同时对黑岩窝组的岩性、岩层组合与古生物组合特征、厚度和时代归属等作了补充和修正,根据其中所含生物群认为黑岩窝组时代为晚泥盆世法门晚期;3)通过与周边地区的地层对比,探讨了龙门山石炭纪的古地理格局及环境演变,认为除前龙门山中部的桂溪—沙窝子等狭窄地区因长期地处泥盆纪海水入侵通道,地势低洼,出现了残存式的杜内期沉积外,前龙门山南、北段广大地区杜内期至维宪早、中期已大部抬升露出水面,直到维宪晚期的全球性海侵,前龙门山遂再度没于水下,出现准平原化浅滩相沉积环境,并延续至石炭纪末。     

Lithium isotope fractionation in the southern Cascadia subduction zone

We present lithium (Li) abundances and isotope compositions for a suite of anhydrous olivine tholeiites (HAOTs) and hydrous basalt-andesitic (BA) lavas from the Mt. Shasta and Medicine Lake regions, California. The values of δ⁷Li vary from + 0.9‰ to + 6.4‰ and correlate inversely with distance from the trench. These data are consistent with continuous isotope fractionation of Li during dehydration of the subducted oceanic lithosphere, an interpretation corroborated by uniformly high pre-eruptive H₂O contents in basaltic andesites accompanied by high Li, Rb, Sr, Ba and Pb abundances. The subduction-derived component that was added to these hydrous magmas is shown to be very similar beneath both Mt. Shasta and Medicine Lake volcanoes despite characteristically distinct Li isotope compositions in the magmas themselves. More evolved andesites and dacites from Mt. Shasta have δ⁷Li from + 2.8 to + 6.9‰ which is identical with the range obtained for HAOTs and BA lavas from Mt. Shasta. Therefore, Li isotopes do not provide evidence for any other crustal component admixed to Mt. Shasta andesites or dacites during magmatic differentiation and magma mixing in the crust.     

Comparison between Pollutant Concentration in the Samples of Fog and Rime Water Collected at Mt. Milešovka

The article aims at showing the differences in concentration of pollutants that are contained in the samples of fog and/or low cloud water in comparison with the water from rime. The results follow from the fog and rime measurements made at Mt. Mileovka (eské Stedohoí Mountains). They are compared with the results of other studies that also report the differences in fog and rime chemistry.