华南阿伦尼格世几丁虫生物地层与古生物地理

本文系统介绍了湖北宜昌黄花场及浙江常山黄泥塘剖面Ａｒｅｎｉｇ统几丁虫分布发育规律，指出华南地区Ａｒｅｎｉｎｇ统的几丁虫自下向上可划分为Ｃｏｎｏｃｈｉｔｉｎａｓｙｍｍｅｔｒｉｃａ，Ｅｒｅｍｏｃｈｉｔｉｎａｂａｃｕｌａｔａ，Ｅｒｅｍｏｃｈｉｔｉｎａｂｒｅｖｉｓ－Ｃｏｎｏｃｈｉｔｉｎａｌａｎｇｅｉ，Ｃｏｎｏｃｈｉｔｉｎａｐｉｒｕｍ，Ｒｈａｂｄｏｃｈｉｔｉｎａｔｕｒｇｉｄａ等生物带。讨论了华南地区这一时期     

Early Ordovician Sea Level Changes in South China and Their Worldwide Correlation

INTRODUCTIONTheoaf~ansed~arewidelydistributedinSouthetna,fromtheYanalCratondPborminnorthtocontinentalmarginofsoutheastern~insouth.ThePreSentpaperdiscussesmainlytheEarlyOrdovidan(thehoeofHirmtodontussimplex~tothebaseofNemopagngraciliszone,Wangatal.,1992)sealeVelchangeSandtheirworldwidecorrelationbasedonasyntheticalstudyofseqUenCe,bioshatiglaphyandaretratigl'aphy.Thisapproachwillfillinthe~instudyoftheOrdovidanofChina,andimprovethesu~ionandCO~ionofbio--,litho--andcbronostheigraphy.Mea…     

TRMM卫星微波成像仪分级产品及其反演降水算法

文章叙述了获取定量降水信息的意义，简要介绍了对热带测雨卫星TRMM(Tropical Rainfall Measurement Mission)的仪器、美国国家宇航局提供的微波成像仪TMI(TRMM Microwave Imager)分级产品。对比了物理方法和经验方法反演降水的特点，并对一些经验方法以及倾斜对流系统对反演降水的影响、动态聚类分析、神经网络反演方法的研究成果进行了介绍。     

Asynchronous Holocene climatic change across China

A review of Holocene climatic variations in different parts of China shows that they were asynchronous. Proxy data from ice cores, pollen, loess, lacustrine sediments, and changes of sea and lake levels demonstrate that many warm and cold oscillations have occurred in China during the Holocene, including a most important climatic event known as the “Holocene optimum,” a milder and wetter period, and that the duration and amplitude of the optimum period, as well as its start and end times, differed in different parts of China. Uplift of the Tibetan plateau over the past millions of years led to the development of the monsoon climate and to complex atmospheric circulation over continental China during the Holocene. As a result, the Holocene optimum began and terminated earlier in high-altitude regions of western China than at lower elevations in eastern China, and the amplitude of the variations was lower in the east. This suggests that the western higher-altitude areas were more sensitive to climatic change than were the eastern lower-altitude areas. Holocene climatic records in the Dunde and Guliya ice cores do not correspond. Inverse δ¹⁸O variations between the two cores indicate that the effects of climate and atmospheric processes on the stable isotopes at the two sites differed. The correlation between the isotopic composition of carbonates in lake deposits in western China and climatic variations is similar to that in the ice cores. The climatic resolution in ice cores and lake sediments is higher than that in other media. The lack of precise correspondence of climatic records constructed on the basis of proxy data from different parts of China is a result of the different locations and elevations of the sampling sites, the different resolutions of the source material, and the varied climatic conditions within China. Further work is needed to confirm both the conclusions and the inferences presented here.     

改进的能量守恒方法及其在CHAMP重力场恢复中的应用

An efficient method for gravity field determination from CHAMP orbits and accelerometer data is referred to as the energy balance approach. A new CHAMP gravity field recovery strategy based on the improved energy balance approach IS developed in this paper. The method simultaneously solves the spherical harmonic coefficients, daily Integration constant, scale and bias parameters. Two 60 degree and order gravitational potential models, XISM-CHAMPO1S from the classical energy balance approach, and XISM-CHAMPO2S from the improved energy balance, are determined using about one year＇s worth of CHAMP kinematic orbits from TUM and accelerometer data from GFZ. Comparisons among XISM-CHAMPO1S, XISM-CHAMPO2S, EIGEN-CGO3C, EIGEN-CHAMPO3S, EIGEN2, ENIGNIS and EGM96 are made. The results show that the XISM-CHAMPO2S model is more accurate than EGM96, EIGENIS, EIGEN2 and XISM-CHAMPO1S at the same degree and order, and has almost the same accuracy as EIGEN-CHAMPO3S.     

Seasonal change of ice algal and phytoplankton assemblages in the Nella Fjord near Zhongshan Station, East Antarctica

The ice algal and phytoplankton assemblages were studied from Nella Fjord near Zhongshan Station, East Antarctica from April 12 to December 30, 1992. Algal blooms occurred about 3 cm thick on the bottom of sea ice in late April and mid November to early December respectively, and a phytoplankton bloom appeared in the underlying surface water in mid December following the spring ice algal bloom. The biomass in ice bottom was 1 to 3 orders of magnitude higher than that of surface water. Amphiprora kjellmanii, Berkeleya sp., Navicula glaciei, Nitzschia barkelyi, N. cylindrus /N. curta, N. lecointei and Nitzschia sp. were common in the sea ice temporarily or throughout the study period. The biomass in a certain ice segment was decreased gradually and the dominant species were usually succeeded as the season went on. Nitzschia sublineata and Dactyliosolen antarctica were two seasonal dominant species only observed in underlying water column. The assemblages between bottom of ice and underlying surface water were different except when spring ice algae bloomed. The evidence shows that the ice algal blooms occurred mainly by in situ growth of ice algae, and the phytoplankton bloom was mostly caused by the release of ice algae.     

Iron isotopic analyses of geological reference materials on MC-ICP-MS with instrumental mass bias corrected by three independent methods

Here we report iron (Fe) isotopic data of three pure Fe solution standards (IRMM-014, GSB Fe, and NIST 3126a) and five widely used geological reference materials (RMs) from the United States Geological Survey and Geological Survey of Japan obtained on a Neptune Plus multi-collector–inductively coupled plasma–mass spectrometer (MC-ICP-MS) in our laboratory over the past 3 years. The instrumental mass bias was corrected by three independent methods: sample-standard bracketing (SSB), Ni doping?+?SSB, and ⁵⁷Fe–⁵⁸Fe double spike?+?SSB. Measurements reveal that both the Ni doping and double spike methods helped calibrate short-term fluctuations in mass bias. Collectively, almost all measurements of RMs yielded δ⁵⁶Fe within?±?0.05 of recommended values, provided that each sample was measured four times on MC-ICP-MS. For the first time, new recommended values for NIST SRM3126a are reported (δ⁵⁶Fe?=?0.363?±?0.006, 2SE, 95% CI; and δ⁵⁷Fe?=?0.534?±?0.010, 2SE).     

青藏高原北羌塘他念他翁山吉塘岩群酉西岩组时代的确定

关于位于青藏高原北羌塘地区的吉塘岩群是否属于前寒武纪变质岩系历来存在较大争议,对其形成年龄一直缺少有效同位素年代学限定。通过高精度的LA-ICP-MS(激光剥蚀等离子体质谱仪)锆石微区原位U-Pb同位素测年,获得他念他翁山一带吉塘岩群酉西岩组石英绿泥片岩(原岩为中性火山岩)的原岩形成年龄为965±55Ma,绿片岩(原岩为中基性火山岩)的原岩形成年龄为1048.2±3.3Ma,表明吉塘岩群酉西岩组原岩形成时代为蓟县纪末—南华纪初。吉塘岩群酉西岩组可能代表Rodinia超大陆裂解早期伸展期间火山-沉积作用的地质记录。     

A Comparison of Nd Isotopes of Granitoids from the Central Asian Orogenic Belt and Qinling-Dabie Orogen,and Implications for Understanding of Crustal Growth from Accretion to Collision

正Orogens can generally be divided into two types:accretionary and collisional.The fundamental differences in deep-crustal compositions and architecture from accretion to collision and how to identify them is not well understood.This is one of the major aims of the IGCP 662 project (www.igcp662.org.cn).The Central Asian Orogenic Belt (CAOB) is a typical and the world's largest Phanerozoic accretionary orogenic belt and the     

水热法从钾长石中提取钾、硅、铝的实验研究

通过水热化学反应将钾长石中的钾、硅和铝转变为可溶性组份,具有十分重要的应用价值.本文用单因素实验考察了不同水热反应实验条件对钾长石中钾、硅、铝溶出率的影响,并根据溶出率结果优化了反应条件.单因素实验结果表明:(1)在190℃条件下,随生石灰加入量的逐渐增加,产物中各元素的溶出率有一个先增加后减少的趋势.(2)在相同的生石灰、钾长石比例下,当反应16 h后,产物中各元素的溶出率随反应时间的延长趋于平缓.(3)随反应温度的逐渐增加,产物中各元素的溶出率逐渐增加.