成像光谱和热红外多光谱技术地质制图研究     

金浩  童庆禧  郑兰芬  贾淑萍 《遥感学报》1994,(2)

根据高光谱分辨率的航空成像光谱（ＭＡＩＳ）和热红外多光谱（ＴＩＭＳ）图像数据中遥感信息特点，即可从其数据获得成像地物光谱，利用航空成像光谱图像处理和分析方法，可有效和精确地对地物特性进行识别和提取。此次以调查沉积岩地区地质地层单元、岩性识别为研究内容的中日联合遥感研究所采用的图像数据，是由中国科学院上海技术物理研究所新开发的ＭＡＩＳ和ＴＩＭＳ获取的。研究结果表明，利用计算机图像处理方法，对ＴＩＭＳ图像进行主成分分析（ＰＣ），ＭＡＩＳ的短波红外（ＳＷＩＲ）图像的假彩色合成图（ＦＣＣ），以及可见近红外（ＶＮＩＲ）图像波段差值处理，可将研究区内出露的白云岩、灰岩以及红色砂岩、绿色砂岩等岩性识别出来，同时圈出了研究区内出露的各个时代的地层，证明了ＭＡＩＳ和ＴＩＭＳ在地质制图方面有较大的潜力。  相似文献   

不平衡铀系定年的新技术突破──高精度、高灵敏度￣（238）U—￣（234）U—￣（230）Th同位素质谱测定和应用     

李献华 《地球科学进展》1994,(3)

８０年代中期发展起来的高精度、高灵敏度不平衡铀系热电离质谱定年新技术是同位素定年技术的一次革命性突破，并已在古气候、古环境、古海洋、考古学以及近代火山—岩浆作用研究中取得了一系列重要成果，本文介绍了这方面的研究进展。这一新技术已引起越来越广泛的重视，显示出巨大的应用前景。尽快开展不平衡铀系热电离质谱定年技术的应用，对提高我国的高分辩率第四纪年代学分析技术和应用研究水平有重要意义。  相似文献   

永暑礁西南礁镯生物地貌与沉积环境   总被引：4，自引：2，他引：4  

余克服  赵建新  施祺  钟晋梁  陈特固 《海洋地质与第四纪地质》2003,23(4):1-7

在海上系统调查的基础上提出南沙群岛永暑礁西南部礁镯并非传统的开放型环礁,而是一个封闭型的小环礁,封闭的泻湖能够为高分辨率古环境重建提供原生生物沉积。该小环礁可分为礁前斜坡活珊瑚林带、外礁坪珊瑚生长带、礁突起珊瑚枝块胶结堆积带、内礁坪枝状珊瑚生长-砂质沉积交互带、泻湖坡枝状珊瑚生长-细砂沉积带和泻湖盆底粉砂质生物沉积带共6个生物地貌和沉积带。12个礁坪原生滨珊瑚和2个礁岩滨珊瑚的^14C和TIMS U-Th测年结果表明永暑礁礁坪面形成于近代,它们没有提供中全新世高海平面的证据,约950aBP的中世纪暖期南沙群岛可能有过非常强的风暴潮。此外,1000年以内的珊瑚常规^14C未校正年代与TIMS U-Th年代存在显著差异,在环境解释中需要特别小心。  相似文献   

GGR Critical Review of Analytical Developments in 2006–2007     

Janet M. Hergt  L. Paul Bédard  Stefanie M. Brueckner  Klaus Peter Jochum  Kathryn L. Linge  Paul J. Sylvester  Michael Wiedenbeck  Jon D. Woodhead 《Geostandards and Geoanalytical Research》2008,32(4):397-398

In 2005 the Geostandards and Geoanalytical Research editorial team, in the true spirit of scientific endeavour, embarked on an experiment of our own. We decided to trial a new kind of review, somewhat different from those more typically observed in journals, and one that would provide readers with a summary of analytical developments across a broad range of topics appropriate to the Earth sciences. The first contribution of this kind appeared in 2005, and reported on developments in 2003 (Hergt et al. 2005). The second, this time a biennial review, was published in 2006 and reported on highlights of the 2004 and 2005 literature (Hergt et al. 2006). Based on reprint requests, positive remarks at conferences and strong citations we consider the experiment a resounding success and proudly present here the third in this series. This comprises six individual review sections that cover the main analytical technologies and topical application fields in geoanalysis and geochemistry, including geological and environmental reference materials, ICP‐thermal and secondary ionisation‐mass spectrometry, as well as neutron activation analysis, X‐ray fluorescence and atomic absorption spectrometry.  相似文献   

Barium Isotopic Compositions of Geological Reference Materials          下载免费PDF全文

Kirsten van Zuilen  Thomas F. Nägler  Thomas D. Bullen 《Geostandards and Geoanalytical Research》2016,40(4):543-558

The interest in variations of barium (Ba) stable isotope amount ratios in low and high temperature environments has increased over the past several years. Characterisation of Ba isotope ratios of widely available reference materials is now required to validate analytical procedures and to allow comparison of data obtained by different laboratories. We present new Ba isotope amount ratio data for twelve geological reference materials with silicate (AGV‐1, G‐2, BHVO‐1, QLO‐1, BIR‐1, JG‐1a, JB‐1a, JR‐1 and JA‐1), carbonate (IAEA‐CO‐9) and sulfate matrices (IAEA‐SO‐5 and IAEA‐SO‐6) relative to NIST SRM 3104a. In addition, two artificially fractionated in‐house reference materials BaBe12 and BaBe27 (δ^137/134Ba = ?1.161 ± 0.049‰ and ?0.616 ± 0.050‰, respectively) are used as quality control solutions for the negative δ‐range. Accuracy of our data was assessed by interlaboratory comparison between the University of Bern and the United States Geological Survey (USGS). Data were measured by MC‐ICP‐MS (Bern) and TIMS (USGS) using two different double spikes for mass bias correction (¹³⁰Ba–¹³⁵Ba and ¹³²Ba–¹³⁶Ba, respectively). MC‐ICP‐MS measurements were further tested for isobaric and non‐spectral matrix effects by a number of common matrix elements. The results are in excellent agreement and suggest data accuracy.  相似文献   

内蒙古阿拉善左旗巴音诺尔公花岗岩体TIMS锆石U-Pb年龄   总被引：1，自引：1，他引：0  

党智财  李俊建  赵泽霖  付超  唐文龙  王守光  赵丽君  刘晓雪 《地质通报》2016,35(4):593-598

内蒙古自治区阿拉善东南部的巴音诺尔公花岗岩体,地处华北陆块西北缘,霍尔森-查干楚鲁构造带以南的雅布赖-巴音诺尔公构造带内。岩体整体上受NEE向构造控制,主要由中-细粒黑云母花岗岩和中-粗粒似斑状黑云母花岗岩2种岩石类型组成。采用TIMS锆石U-Pb定年法,测得巴音诺尔公岩体不同位置中-细粒黑云母花岗岩和中-粗粒似斑状黑云母花岗岩样品年龄分别为304.7±2.8Ma和289.0±3.8Ma,属于晚石炭世—早二叠世。结合前人资料,提出巴音诺尔公岩体至少存在2期岩浆活动,分别为晚石炭世(304Ma)和早二叠世(289~272Ma)。  相似文献   

内蒙古阿拉善地区沙拉扎山花岗岩体TIMS锆石U-Pb年龄   总被引：1，自引：0，他引：1  

赵泽霖  李俊建  党智财  唐文龙  付超  王守光  刘利双  赵丽君  刘晓雪 《地质通报》2016,35(4):599-604

内蒙古阿拉善地区的沙拉扎山处于华北板块、塔里木板块和天山-兴蒙造山带接触部位,恩格尔乌苏蛇绿岩带与查干础鲁蛇绿岩带之间。沙拉扎山内出露一套巨大花岗质岩基,为了认识其岩浆活动期次,对沙拉扎山岩体不同部位花岗质岩石样品进行了TIMS锆石U-Pb测年。结果表明,沙拉套尔汗花岗闪长岩年龄为233.1±5.8Ma,乌力吉花岗岩2个样品年龄分别为228.1±0.4Ma和207.7±0.8Ma。对比分析前人对该区岩体年龄的研究成果,认为沙拉扎山出露的花岗岩由早二叠世晚期(273~274Ma)、早三叠世(248~252Ma)、晚三叠世早期(228~236Ma)和晚三叠世末期(207Ma)4期岩浆活动叠加而成,同时发育在沙拉扎山的4期岩浆活动在巴音—诺尔公地区也有相应的岩浆记录。  相似文献   

High‐Precision Sr‐Nd‐Hf‐Pb Isotopic Composition of Chinese Geological Standard Glass Reference Materials CGSG‐1, CGSG‐2, CGSG‐4 and CGSG‐5 by MC‐ICP‐MS and TIMS     

Yue‐Heng Yang  Ming Yang  Klaus Peter Jochum  Shi‐Tou Wu  Han Zhao  Lie‐Wen Xie  Chao Huang  Xiu‐Chun Zhan  Jin‐Hui Yang  Fu‐Yuan Wu 《Geostandards and Geoanalytical Research》2020,44(3):567-579

To assess the homogeneity of and provide the first Sr‐Nd‐Hf‐Pb isotopic reference values for the Chinese Geological Standard Glasses CGSG‐1, CGSG‐2, CGSG‐4 and CGSG‐5, we measured these isotopes in several measurement sessions over the course of nearly 3 years. The results were obtained by high‐precision MC‐ICP‐MS and TIMS. Our investigation indicates that these CGSG glass reference materials are homogenous with regard to Sr‐Nd‐Hf‐Pb isotopic distribution and are therefore suitable geochemical materials for Sr‐Nd‐Hf‐Pb isotope measurements. Clear differences in Sr‐Nd‐Hf‐Pb isotopic composition were observed between the glasses and the original powdered rock reference materials (CGSG‐2 and GSR‐7, and especially CGSG‐5 and GSR‐2) because of flux addition during preparation of the glasses. The new Sr‐Nd‐Hf‐Pb isotope data provided here might be useful to the geochemical community for in situ and bulk analysis.  相似文献   

Barbados岛珊瑚礁高精度铀系年龄及讨论   总被引：3，自引：0，他引：3       下载免费PDF全文

马志邦  王兆荣 《地质科学》1999,34(1):116-122

应用同位素稀释法热电离质谱(TIMS)技术测定珊瑚礁的高精度铀系年龄。通过对BarbadosⅢ、Ⅳ阶地等样品分析,RendezvousHil和Curacao+6m的TIMS年龄分别为129.2±1.2kaB.P.和125.4±1.1kaB.P.,对应深海沉积物氧同位素第5期5e段的高海面;Kendal山阶地为208.1±1.9kaB.P.,可能代表7c间冰期高海平面的时代。该结果与Edwards等测定同一阶地的年龄一致,与α谱法数据在误差范围内吻合。另外,探讨了初始铀同位素比值的变化,并对TIMS年龄的可靠性做了评价。  相似文献   

中-浅正变质岩锆石SHRIMP法与TIMS法测年结果不一致处理——以滇东南南温河花岗岩为例   总被引：1，自引：0，他引：1  

谭洪旗  刘玉平  徐伟  郭利果  叶霖  李朝阳 《矿物学报》2011,31(1):62-69

变质岩中的锆石大多遭受变质热事件的改造,但中-浅变质岩一般不甚发育新生锆石或变质增生边,不易通过现有的锆石测年技术获得该岩石的变质年龄。中-浅正变质岩的锆石为岩浆锆石与变质增生锆石的混合物,其U-Pb同位素组成可以采用二端元混合模式来表达。利用同位素稀释法(TIMS)可以获得混合锆石U-Pb年龄及对应的同位素组成;结合CL等内部结构分析,利用离子探针法(SHRIMP)可以获得岩浆锆石U-Pb年龄及对应的同位素组成,进而推算出变质增生锆石U-Pb年龄对应的同位素组成。在对滇东南南温河花岗岩锆石U-Pb年代学的研究中,我们发现同一样品的SHRIMP与TIMS U-Pb法测年结果不一致,根据上式推算出后期主变质年龄约为230 Ma,与前人利用其它测年方法获得的结果基本一致,符合研究区主变质期为印支期的区域地质背景。该方法为中-浅正变质岩年代学研究提供了一种新思路。  相似文献