共查询到10条相似文献，搜索用时 78 毫秒
1.
Fluid inclusions in mineralized graphite-sillimanite-mica schist from the Rampura-Agucha Pb-Zn-(Ag) deposit, Rajasthan, northwest India, have been investigated by microthermometry and Raman microspectrometry. Three different main types of fluid inclusions in quartz can be distinguished: (1) gaseous (CO2, partially mixed with CH4-N2), (2) low salinity aqueous inclusions (0–8 eq. wt% NaCl) and (3) high salinity aqueous inclusions (NaCl ± MgCl2-CaCl2). Low density CO2-rich and low salinity H2O inclusions are contemporaneous and occur, together with CH4-N2 inclusions, in close association with sulfide mineral inclusions. This indicates immiscibility between the gaseous and aqueous phase and participation of these fluids during the deposition or remobilization of the ore, which occurred over a wide P (1220 to 200 bar) and T (450 to 250 °C). Raman spectra of graphite indicate upper greenschist-facies metamorphic conditions, although host rocks have been metamorphosed at upper amphibolite-facies metamorphic conditions. This indicates that graphite re-equilibrated with the CO2-rich phase during retrograde metamorphism. 相似文献
2.
激光拉曼光谱法在单个流体包裹体研究中的应用进展 总被引：2，自引：2，他引：0
激光拉曼光谱法以其非破坏性、高灵敏度和高分辨率等特性,一直以来都是研究流体包裹体的重要方法之一。近年来,围绕激光拉曼光谱在流体包裹体中的应用而展开的研究主要集中在半定量-定量测试方面,即在准确定性的基础上,采用高斯-洛仑兹去卷积分峰、低温原位等定量方法获取流体包裹体的成分和含量,从而克服了激光拉曼光谱法应用于溶液中阳离子的定量分析的灵敏度、准确度较低的问题,不仅能获得流体包裹体中一些常温下不具拉曼活性的盐类物质拉曼特征峰信息,还能根据特征峰与浓度、内压之间的线性关系,进一步对盐度和压力等性质进行测定,从而拓展了激光拉曼光谱法在流体包裹体中的应用范围。本文对激光拉曼光谱法应用于分析流体包裹体成分、盐度、同位素和压力所取得的最新进展进行了评述,并认为随着分析测试技术的不断进步,激光拉曼光谱法未来的分析方向也将继续围绕多元复杂体系及其定量方面的研究展开。 相似文献
3.
应用显微激光拉曼光谱分析单个流体包裹体同位素 总被引：4，自引：0，他引：4
单个流体包裹体同位素是研究特定成岩成矿（藏）阶段古流体成因和来源最有效的方法之一,在矿床、油气、地质流体和大地构造演化动力学等多个领域具有十分重要的用途。但是,目前还没有成熟的分析单个流体包裹体同位素的方法。文中在对目前国内外流体包裹体分析技术总结分析基础上,认为激光拉曼光谱是一项可以分析单个流体包裹体同位素的最有效方法,国外在该领域已经开展了许多创新性的研究工作,并取得了一些重要进展。对激光拉曼光谱分析单个流体包裹体同位素的原理和可行性进行了分析论证,提出通过对已知比值的同位素标准物质拉曼光谱测试和研究,在确定稳定同位素分子的拉曼参数和实验条件等基础上,可以建立起单个流体包裹体稳定同位素激光拉曼测试方法,从而改变目前只能依靠分析群体包裹体同位素来示踪古流体成因和来源的局限性和不确定性。 相似文献
4.
流体包裹体激光拉曼光谱分析原理、方法、存在的问题及未来研究方向 总被引：7，自引：0，他引：7
国内外在流体包裹体激光拉曼光谱研究方面取得了大量的成果。本文回顾了流体包裹体激光拉曼光谱分析技术的发展历史,介绍了流体包裹体激光拉曼光谱技术定性和定量分析的原理和方法,指出了该技术存在的问题及未来研究方向。流体包裹体激光拉曼光谱分析主要受到样品、荧光、同位素、光化学反应、水溶性物质信号弱、气相水及水合物、子矿物等因素的影响。由于用来进行定量分析的拉曼散射截面参数明显受到压力影响,加上峰面积计算不规范化使得目前的流体包裹体激光拉曼光谱分析结果可靠性有待于重新审视。未来流体包裹体拉曼光谱分析技术应当在完善不同标准体系和标准物质光谱数据的基础上,针对不同类型包裹体采用采取不同条件,分析结果将在准确定性的基础上从相对定量向绝对定量发展。 相似文献
5.
Determination of Salinity in Fluid Inclusions with Laser Raman Spectroscopy Technique 总被引：2，自引：0，他引：2
Seyed Javad Moghaddasi 《中国地质大学学报(英文版)》2000,11(4)
ＩＮＴＲＯＤＵＣＴＩＯＮＬａｓｅｒＲａｍａｎｍｉｃｒｏｐｒｏｂｅｈａｓｂｅｅｎｆｏｕｎｄｉｎｍａｎｙｇｅｏｌｏｇｉｃａｌａｐｐｌｉｃａｔｉｏｎｓ (Ｓｈｏｖａｌｅｔａｌ.,1995 ;ＭｃＭｉｌｌａｎａｎｄＨｏｆｍｅｉｓｔｅｒ,1988;ＭｃＭｉｌｌａｎ ,1984;Ｄｕｂｅｓｓｙｅｔａｌ.,1982 ;Ｇｒｉｆｆｉｔｈ ,1975 )ａｎｄａｓａｎｏｎ ｄｅｓｔｒｕｃｔｉｖｅａｎｄｉｎｓｉｔｕｔｅｃｈｎｉｑｕｅ,ｉｔｈａｓｈａｄａｔｒｅｍｅｎｄｏｕｓｉｍｐａｃｔｏｎｄｅｖｅｌｏｐｍｅｎｔｏｆｆｌｕｉｄｉｎｃｌｕｓｉｏｎｃｏｍｐｏｓｉ… 相似文献
6.
《Journal of African Earth Sciences》1999,28(2):311-324
A fluid inclusion study was completed on syn-deformational quartz veins of the Pote River Shear Zone, which is situated on the border between the Harare-Bindura greenstone belt and the granitoids of the Chinamora Batholith. The fluid inclusions were studied by means of microthermometry and Laser-Raman microspectrometry. The fluid inclusions consist of three major compositional types: (1) H2OCO2±N2±halite inclusions in clusters and trails; (2) H2OCO2 inclusions (H2O = 30–60 vol. %) in trails; and (3) H2O-halite inclusions in trails. These fluid generations are explained by trapping at different P-T conditions of two different fluids: a high salinity aqueous fluid and a low salinity H2OCO2 fluid with XH2O around 0.8. High salinity aqueous fluid inclusions are characteristic for the granite-greenstone contact and are absent within the Harare-Shamva-Bindura greenstone belt. The high salinity aqueous fluid has, therefore, been interpreted as magmatic in origin. The low salinity H2OCO2 fluid is most likely metamorphic in origin. 相似文献
7.
CH4—H2O体系流体包裹体研究对含油气盆地流体分析和成矿流体研究都有重要的意义。本文详细介绍了H2O、CH4和CH4—H2O体系的拉曼光谱特征及分子作用，分析了CH4—H2O体系热力学特征，同时对CH4—H2O体系流体包裹体拉曼光谱定量分析和计算的方法及步骤进行了叙述。利用人工合成流体包裹体建立甲烷浓度与拉曼特征峰面积比值之间的校正曲线是实现CH4—H2O体系流体包裹体定量分析的基础。盐度对包裹体定量分析的影响最为显著，在恒定甲烷浓度下，甲烷与水的拉曼峰面积比值随着盐度增加而减少。对于流体包裹体封闭体系，随温度升高，液相甲烷浓度增大。校正曲线必须包含对温度和盐度的校正。石英主矿物性质和方位对甲烷浓度定量分析的影响可以忽略。实验研究表明，原位拉曼光谱技术是准确获取流体包裹体中甲烷水合物生成条件的一种有效方法。因此，基于拉曼光谱分析和显微测温分析结果，采用热力学模型可以定量计算CH4—H2O体系流体包裹体的相关参数。 相似文献
8.
盐度是流体包裹体重要的参数之一,利用激光拉曼探针可以快速、准确地测定包裹体盐度,而标准样品的制备是保证该方法准确性的关键。毛细管合成包裹体技术是一种新型的标准样品制备方法,本文利用该方法,制备了不同组成的H2O-NaCl样品,并以此建立了测定包裹体盐度的标准曲线。显微测温结果表明,毛细管合成包裹体标准样品盐度的准确性可以达到±0.5%,利用石英和石盐中的合成包裹体对标准曲线进行了检验,结果表明利用标准曲线测定包裹体盐度,测量值与理论值的误差在1%以内。应用该方法制备的标准样品具有操作简便、快捷、样品尺寸与地质样品相类似等特点,兼具了矿物中合成包裹体以及石英试管或玻璃瓶制备标准样品的优势。 相似文献
9.
Previous cryogenic Raman spectroscopic analysis of H2O-NaCl-CaCl2 solutions has identified the Raman peaks of various hydrates of NaCl and CaCl2,and established a linear relationship between Raman band intensity of the hydrates and the composition of the solution(NaCl/（NaCl+CaCl2） molar ratio,or XNaC1) using synthetic fluids,which created the opportunity to quantitatively determine the solute composition of aqueous fluid inclusions with cryogenic Raman spectroscopy.This paper aims to test the feasibility of this newly established method with natural fluid inclusions.Twenty-five fluid inclusions in quartz from various occurrences which show a high degree of freezing during the cooling processes were carefully chosen for cryogenic Raman analysis.XNaCl was calculated using their spectra and an equation established in a previous study.These inclusions were then analyzed with the thermal decrepitation-SEM-EDS method.The XNaCl values estimated from the two methods show a 1:1 correlation,indicating that the new,non-destructive cryogenic Raman spectroscopic analysis method can indeed be used for fluid inclusion compositional study. 相似文献
10.
CHEN Yong WANG Jiuyuan ZHOU Zhenzhu CHEN Xiaolan ZHAO Zhenyu SHI Peng HAN Yun 《《地质学报》英文版》2021,95(3):1008-1015
Trapped ancient microorganisms in halite fluid inclusions are of special interest to the understanding of biology and ecology in salt lake systems.With the integration of petrologic,microthermometric,and Raman spectroscopic analyses,this study utilizes fluid inclusions from Chaka Salt Lake,eastern Qaidam Basin,NW China,to assess the possibility of microorganism-trapping by fluid inclusions.Here,we report that the solid phase of some primary fluid inclusions contains carotenoids,which is interpreted as evidence of Dunaliella algae,and that the coexisting liquid phase comprises SO_4~(2-).The homogenization temperatures of single-phase primary fluid inclusions indicate that the precipitation temperature of the Holocene halite in Chaka Salt Lake ranges from 13.5°C to 36.4°C.This suggests that fluid inclusions in halite are a good medium for trapping and preserving ancient microorganisms and organic matter in salt lakes,and that Raman spectroscopy has good potential to identify halophilic archaea. 相似文献