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1.
大别-苏鲁造山带榴辉岩及其中磷灰石的碳同位素地球化学 总被引：2，自引：0，他引：2
应用EA MS连线技术 ,对大别山东部和苏鲁地体南部超高压变质榴辉岩及其中的磷灰石进行了碳的含量和同位素分析。结果得到 ,榴辉岩全岩的δ1 3 C值变化较大 (- 30 .7‰～ +2 .5‰ ) ,而所含磷灰石中结构碳酸根的δ1 3 C值变化较小并显著亏损1 3 C(- 2 8.1‰～ - 2 0 .8‰ )。部分榴辉岩具有高的全岩δ1 3 C值 ,指示其形成后受到过含CO2 流体的退化蚀变。低的磷灰石δ1 3 C值指示 ,榴辉岩中含有地表有机碳 ,因此证明这些榴辉岩的原岩曾出露过地表 ,在超高压变质阶段存在以亏损1 3 C为特征的含CO2 流体。 相似文献
2.
中国东部橄榄岩包体和榴辉岩中CO2流体包裹体的碳同位素组成 总被引：9，自引：0，他引：9
应用阶段段加热技术,对中国东部新生代玄武岩中的橄榄岩包体和大别造山带超高压榴辉岩进行了裹体ＣＯ２的碳同位素组成测定,结果表明,榄岩的δ＾１３Ｃ值变化较大,从－２２．８％到＋０．７‰到＋４．６‰,同样明显不同于前人报道的低δ＾１３Ｃ值（－３０‰２０～－２０‰）特征,大别造山带榴辉岩的δ＾１３Ｃ变化从－１８．５‰到＋４．６‰,同样明显不同于前人报道的低δ＾１３Ｃ值（－３０‰～－２０‰）特征。榴辉;岩的 相似文献
3.
大别造山带超高压变质岩稳定同位素地球化学 总被引：3，自引：0，他引：3
通过对大别造山带超高压变质岩的氢、氧和碳同位素地球化学研究,发现了显著的稳定同位素异常。结果对扬子板块向华北板块的俯冲提供了如下化学地球动力学制约： (1)北大别榴辉岩和基性麻粒岩与南大别超高压榴辉岩和片麻岩一样,具有较低的δ 18O值,表明它们在板块俯冲前经历了高温地表水热液蚀变,在超高压变质阶段流体以亏损 13C为特征; (2)部分低δ 18O值榴辉岩的共存矿物对之间保存了氧同位素平衡分馏,记录了榴辉岩相变质温度,指示这些榴辉岩在地幔的居留时间较短,折返初期的冷却速率较大; (3)退变质作用过程中存在显著的差异性氢氧同位素交换,早期阶段流体具有内部缓冲性质,而晚期则具有外部来源; (4)东大别大理岩显著富集 13C,反映出其母岩灰岩的沉积环境为封闭的大陆边缘盆地,西大别苏家河大理岩的δ 13C值接近于正常海相碳酸盐,指示其母岩形成环境为宽广开阔的海洋。 相似文献
4.
《吉林大学学报(地球科学版)》2015,(Z1)
<正>前人的研究表明,洋中脊玄武岩δ56Fe值很均一,高于地幔的δ56Fe值,因此在壳幔分异过程中,铁同位素会发生部分熔融的。而洋岛玄武岩的铁同位素组成较不均一,可能反映了其源区铁同位素的不均一性。俯冲带是壳幔循环过程中的重要场所,同时俯冲折返的板块为我们研究俯冲带提供了很好的条件。为了研究俯冲板块俯冲折返过程中铁同位素的地球化学行为,分析了大别—苏鲁造山带的超高压变质榴辉岩的全 相似文献
5.
中国东部陆下岩石圈地幔中的再循环地壳流体组分 总被引：2，自引：0，他引：2
地幔捕虏体中的流体组分记录了地幔演化的信息,可用来认识地幔中再循环地壳组分的性质和来源。采用分步加热质谱法测定中国东部二辉橄榄岩捕虏体组成矿物中流体挥发份的碳、氢和氧同位素组成,结合化学组成(Zhang et al., 2004)综合分析表明,早期流体包裹体、矿物晶格缺陷和空隙中的流体挥发分主要在高温段(800-1200°C)释出,CO2和CO显示较轻的δ13C值,与世界其它地区地幔捕虏体明显不同;晚期流体包裹体中的流体挥发分主要在低温段(300-600°C)释出。根据中国东部地幔演化事件、地幔矿物性质认为陆下岩石圈地幔中三种类型的流体挥发份中均存在来源不同的再循环地壳组分：（1）地幔初始流体：主要为耐熔矿物橄榄石在800-1200°C释出的流体组分,华北克拉通地幔初始流体的化学组成（主要为CO）与华南克拉通（主要为CO2）明显不同,反映二者拼合前各自演化时期捕获的流体组分。地幔特征的δD、δ13CCH4和δ18OCO2反映初始流体组分可能为元古代克拉通大陆型岩石圈地幔成分,较轻的CO2 和 CO的δ13C值揭示初始流体中存在部分再循环地壳流体,可能在1.9Ga的大陆碰撞过程中混入。（2）地幔交代流体：指斜方辉石和单斜辉石800-1200°C释气峰的流体组分,以H2为主。华北克拉通交代流体主要组分H2含量(80.73 mm3.STP/g) 明显低于华南克拉通(138.91 mm3.STP/g),地幔特征的δDH2和δ13CCH4表明交代流体主体为地幔来源,较轻的δ13CCO2,CO和较重δ18OCO2揭示其中存在再循环陆壳流体,其可能的来源为华北与华南中生代拼合过程中的壳幔相互作用。（3）岩石圈减薄流体：指二辉橄榄岩捕虏体组成矿物在400-600°C释放出的流体,华北与华南克拉通在流体组成方面相似,壳源特征的CO2、CO和CH4的δ13C值,以及较轻的δ18OCO2和δDH2O值指示该流体可能为岩石圈地幔减薄过程中引起的再循环洋壳流体,可能与中国东部转换带中水平俯冲的太平洋岩石圈(或其前身)脱气有关。 相似文献
6.
中国东部陆下岩石圈地幔中的再循环地壳流体组分 总被引：1，自引：0，他引：1
地幔捕虏体中的流体挥发份保存了地幔演化过程的流体介质.中国东部二辉橄榄岩捕虏体中橄榄石、斜方辉石和单斜辉石流体挥发份的化学组成和碳、氢和氧同位素组成分步加热质谱法测定结果表明,陆下岩石圈地幔以较轻的碳、氢同位素和氧同位素组成变化范围大为特征,高温(800～1200 ℃)释放的CO2和CO呈现较轻的δ13C值,与世界其他地区的地幔捕虏体明显不同[1]. 相似文献
7.
达拉布特蛇绿岩位于中亚造山带西南缘,是古亚洲洋的扩张、俯冲、消减和闭合过程的产物,保留了洋盆形成及构造演化信息。前人对达拉布特蛇绿岩的形成大地构造背景始终未取得统一的认识。为探讨蛇绿岩所代表的构造演化过程,笔者以达拉布特蛇绿岩中的地幔橄榄岩为研究对象,通过详细的矿物地球化学及其氧同位素研究,对达拉布特地幔橄榄岩成因及构造背景提出新的制约。达拉布特方辉橄榄岩中橄榄石Ni/Co值为21~22,Ni/Mn值为3.0~7.8具有部分熔融残余的特征,此外,橄榄石中不相容元素相对于正常地幔橄榄石亏损,表明方辉橄榄岩为部分熔融的残余组分。方辉橄榄岩中尖晶石Cr# 为47~52、TiO2含量0.01%~0.04%,橄榄石Fo为90.34%~90.98%指示方辉橄榄岩经历>20%的部分熔融。方辉橄榄岩中橄榄石δ18 Oolivine值+5.1~+6.2‰、单斜辉石δ18Ocpx值+5.6~+6.9‰,其变化范围较大且整体高于正常地幔中橄榄石和单斜辉石的δ18 O值,矿物间氧同位素分馏系数Δ18OOpx—olivine平均-0.3‰,Δ18OOpx—cpx平均-0.7‰,显著区别于正常地幔中平衡的氧同位素分馏系数,具有明显的交代作用特征。结合方辉橄榄岩橄榄石中亏损的微量元素特征,认为方辉橄榄岩可能受到流体交代作用的影响,俯冲壳源物质脱水形成的高δ18O流体交代地幔橄榄岩导致了矿物与矿物间不平衡的氧同位素特征。通过尖晶石与单斜辉石成分判别,尖晶石与单斜辉石的主量元素具有介于弧前与深海地幔之间的过渡型特征,与俯冲初始阶段形成的地幔橄榄岩相似。综合矿物地球化学与氧同位素特征,笔者认为达拉布特地幔橄榄岩为形成于弧前初始俯冲环境。板块俯冲导致弧前扩张形成新洋壳,上涌的软流圈MORB like熔体与俯冲壳源物质熔融形成熔/流体与地幔橄榄岩相互作用,形成达拉布特地幔橄榄岩。 相似文献
8.
达拉布特蛇绿岩位于中亚造山带西南缘,是古亚洲洋的扩张、俯冲、消减和闭合过程的产物,保留了洋盆形成及构造演化信息。前人对达拉布特蛇绿岩的形成大地构造背景始终未取得统一的认识。为探讨蛇绿岩所代表的构造演化过程,笔者以达拉布特蛇绿岩中的地幔橄榄岩为研究对象,通过详细的矿物地球化学及其氧同位素研究,对达拉布特地幔橄榄岩成因及构造背景提出新的制约。达拉布特方辉橄榄岩中橄榄石Ni/Co值为21~22,Ni/Mn值为3.0~7.8具有部分熔融残余的特征,此外,橄榄石中不相容元素相对于正常地幔橄榄石亏损,表明方辉橄榄岩为部分熔融的残余组分。方辉橄榄岩中尖晶石Cr# 为47~52、TiO2含量0.01%~0.04%,橄榄石Fo为90.34%~90.98%指示方辉橄榄岩经历>20%的部分熔融。方辉橄榄岩中橄榄石δ18 Oolivine值+5.1~+6.2‰、单斜辉石δ18Ocpx值+5.6~+6.9‰,其变化范围较大且整体高于正常地幔中橄榄石和单斜辉石的δ18 O值,矿物间氧同位素分馏系数Δ18OOpx—olivine平均-0.3‰,Δ18OOpx—cpx平均-0.7‰,显著区别于正常地幔中平衡的氧同位素分馏系数,具有明显的交代作用特征。结合方辉橄榄岩橄榄石中亏损的微量元素特征,认为方辉橄榄岩可能受到流体交代作用的影响,俯冲壳源物质脱水形成的高δ18O流体交代地幔橄榄岩导致了矿物与矿物间不平衡的氧同位素特征。通过尖晶石与单斜辉石成分判别,尖晶石与单斜辉石的主量元素具有介于弧前与深海地幔之间的过渡型特征,与俯冲初始阶段形成的地幔橄榄岩相似。综合矿物地球化学与氧同位素特征,笔者认为达拉布特地幔橄榄岩为形成于弧前初始俯冲环境。板块俯冲导致弧前扩张形成新洋壳,上涌的软流圈MORB like熔体与俯冲壳源物质熔融形成熔/流体与地幔橄榄岩相互作用,形成达拉布特地幔橄榄岩。 相似文献
9.
大陆板块俯冲和折返的同位素地球动力学 总被引：5，自引：1，他引：5
大别 -苏鲁造山带是扬子大陆板块与华北大陆板块之间在三叠纪时期俯冲 -碰撞所形成的超高压变质带。对该带超高压变质岩的稳定同位素研究发现 ,不仅含柯石英榴辉岩出现局部氧同位素负异常 (δ18O =- 10‰ ) ,而且区域上存在氧同位素分布的不均一性 (δ18O =- 10‰～+10‰ )。前者要求榴辉岩原岩在变质前经历过大气降水热液蚀变 ,说明俯冲板块具有大陆地壳特点 ;后者反映扬子板块具有快速俯冲变质的特征 ,否则将达到同位素均一化。榴辉岩氧同位素负异常的保存显示 ,这些超高压变质岩与地幔之间没有发生显著的化学相互作用。因此 ,载有榴辉岩原岩的板块俯冲到 2 0 0多公里深的地幔内部时 ,超高压岩石形成后在地幔中的滞留时间很短(<10Ma) ,致使它们与地幔之间的氧同位素交换没有达到再平衡。榴辉岩中不同矿物对氧同位素测温不仅给出了相互一致的结果 (6 5 0～ 75 0℃ ) ,而且这些温度与阳离子交换温度计的结果 (6 0 0～80 0℃ )相一致。因此 ,在榴辉岩相变质温度下共生矿物之间的氧同位素平衡已被“冻结” ,岩石冷却过程中的氧同位素交换再平衡没有发生 ,从而证明超高压榴辉岩在变质作用后经历了快速降压/冷却过程 ,对应于板块的快速抬升。这些结果首次从地球化学角度证明了大陆板块俯冲—超高压变质—折 相似文献
10.
壳-幔演化和板块俯冲作用过程中的硼同位素示踪 总被引：2，自引：0，他引：2
硼同位素是近年来发展起来的一门新兴的稳定同位素地球化学方法。硼有两个稳定同位素 :10 B和11B。硼同位素组成自然界变化十分大 ,δ11B值为 - 37‰～ +58‰。对地幔岩石的硼同位素研究表明 ,原始地幔的δ11B值为 - 10‰± 2‰ ,B的质量分数估算为 (0 2 5± 0 1)×10 -6。相对而言 ,地壳岩石的B含量和δ11B值均较高。由于壳、幔岩石具有不同的B含量和δ11B值 ,硼同位素已被广泛应用于研究壳幔演化和板块俯冲作用过程 ,用于示踪俯冲板块中大洋沉积物和蚀变洋壳在地幔中的循环。 相似文献
11.
由于海冰覆盖，北极碳汇（Arctic Carbon Sink）在全球碳通量预算中经常被忽略或简单处理。但随着全球变化加剧，北极发生快速变化，北极碳循环及其对全球变化的响应与反馈日趋重要。综合对北极碳汇的研究结果，分析了北极碳汇的来源、变化以及主要调控因子，评估了北极碳汇现状。探讨了在全球变化中，影响北极碳汇变化的因素及其对未来北极碳汇变化趋势的影响。
相似文献
12.
在百万年时间尺度上,大气、海洋中的二氧化碳浓度(PCO2,二氧化碳分压)和长期变化主要受岩浆-变质脱碳作用和硅酸盐风化作用(消耗二氧化碳)控制。因此,地球表层主要构造活动带的构造-岩浆活动对长期碳循环具有重要的驱动作用。本文在总结已发表文献的基础上,系统评估了大陆弧,尤其是晚白垩世大陆弧的岩浆作用和剥蚀作用的碳通量,并以此为依据探讨了大陆弧演化对于全球长期碳循环的影响。大陆弧岩浆作用以周期性(几十万年至一百百万年)岩浆爆发(magmatic flare-ups)为特征。在一个周期内,大规模岩浆喷发会导致CO2排放量大幅度增加,促进温室效应。但同时,大规模的岩浆作用又会导致地壳增厚和和地表抬升,从而促进剥蚀作用、提高化学风化通量,进而增加CO2消耗量。对于单个的大陆弧来说,在其演化的不同阶段对于碳循环扮演着不同的角色：演化早期由于岩浆作用起主导作用,表现为净碳源;而在岩浆作用减弱或停止后,由于剥蚀作用的持续进行,表现为净碳汇。因此,从长周期和全球尺度上讲,大陆弧岩浆活动表现的“碳源属性”受到化学风化作... 相似文献
13.
《China Geology》2021,4(4):720-746
Climate change is a common problem in human society. The Chinese government promises to peak carbon dioxide emissions by 2030 and strives to achieve carbon neutralization by 2060. The proposal of the goal of carbon peak and carbon neutralization has led China into the era of climate economy and set off a green change with both opportunities and challenges. On the basis of expounding the objectives and specific connotation of China’s carbon peak and carbon neutralization, this paper systematically discusses the main implementation path and the prospect of China’s carbon peak and carbon neutralization. China’s path to realizing carbon neutralization includes four directions: (1) in terms of carbon dioxide emission control: energy transformation path, energy conservation, and emission reduction path; (2) for increasing carbon sink: carbon capture, utilization, and storage path, ecological governance, and land greening path; (3) in key technology development: zero-carbon utilization, coal new energy coupling, carbon capture utilization and storage (CCUS), energy storage technology and other key technology paths required to achieve carbon peak and carbon neutralization; (4) from the angle of policy development: Formulate legal guarantees for the government to promote the carbon trading market; Formulate carbon emission standards for enterprises and increase publicity and education for individuals and society. Based on practicing the goal and path of carbon peak and carbon neutralization, China will vigorously develop low carbon and circular economy and promote green and high-quality economic development; speed up to enter the era of fossil resources and promoting energy transformation; accelerate the integrated innovation of green and low-carbon technologies and promote carbon neutrality.©2021 China Geology Editorial Office. 相似文献
14.
Miyuki Tahata Yusuke Sawaki Yuichiro Ueno Manabu Nishizawa Naohiro Yoshida Toshikazu Ebisuzaki Tsuyoshi Komiya Shigenori Maruyama 《地学前缘(英文版)》2015,6(1):121-136
Important ecological changes of the Earth(oxidization of the atmosphere and the ocean) increase in nutrient supply due to the break-up of the super continent(Rodinia) and the appearance of multi-cellular organisms(macroscopic algae and metazoan) took place in the Ediacaran period,priming the Cambrian explosion.The strong perturbations in carbon cycles in the ocean are recorded as excursions in carbonate and organic carbon isotope ratio(δ~(13)C_(carb) and δ~(13)C_(org)) from the Ediacaran through early Cambrian periods.The Ediacaran-early Cambrian sediment records of δ~(13)C_(carb) and δ~(13)C_(org),obtained from the drill-core samples in Three Gorges in South China,are compared with the results of numerical simulation of a simple one-zone model of the carbon cycle of the ocean,which has two reservoirs(i.e.,dissolved organic carbon(DOC) and dissolved inorganic carbon(DIC).The fluxes from the reservoirs are assumed to be proportional to the mass of the carbon reservoirs.We constructed a model,referred to here as the Best Fit Model(BFM),which reproduce δ~(13)C_(carb) and δ~(13)C_(org) records in the Ediacaran-early Cambrian period noted above.BFM reveals that the Shuram excursion is related to three major changes in the carbon cycle or the global ecological system of the Earth:(1) an increase in the coefficient of remineralization by a factor of ca.100,possibly corresponding to a change in the dominant metabolism from anaerobic respiration to aerobic respiration,(2) an increase of carbon fractionation index from 25‰ to 33‰,possibly corresponding to the change in the primary producer from rock-living cyanobacteria to free-living macro algae,and(3) an increase in the coefficient of the organic carbon burial by a factor of ca.100,possibly corresponding to the onset of a biological pump driven by the flourishing metazoan and zooplankton.The former two changes took place at the start of the Shuram excursion,while the third occurred at the end of the Shuram excursion.The other two excursions are explained by the tentative decrease in primary production due to cold periods,which correspond to the Gaskiers(ca.580 Ma) and Bikonor(ca.542 Ma) glaciations. 相似文献
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16.
Yafeng Zhang Zhen Yao Qiang Ma Bingyan Ji Guowen Miao Guang Xu Fengjuan Ma 《地球科学进展》2018,33(2):206-212
It is important to investigate the soil organic carbon reserves of the northern Tibetan Plateau for understanding the global carbon cycle. The surface soil carbon storage is 1.27×108 t, and the surface topsoil organic carbon density is 4.96×103 t/km2 in the study area. Compared with the results of the second National Soil Census, the distribution of organic carbon reserves of chestnut soil, sierozem, alpine steppe soil, swamp soil, sandy soil and ustic cambisols increased gradually, which are mainly distributed in savanes of the northern Qinghai Lake and woodland in middle-high mountain areas of the eastern Qinghai Lake; savanes and woodland are classified as the carbon sink area because this area’s carbon sequestration is greater than the release quantity. By contrast, the distribution of organic carbon reserves of mountain meadow soil, alpine meadow soil, grey cinnamon soil, chernozem and anthropogenic-alluvial soil decreased gradually, which are mainly distributed in the farming areas of eastern Qinghai Province. This area’s carbon sequestration is less than the release quantity because of cultivation effect, and is classified as the carbon source area. The 97.5% of organic carbon storage cumulative frequency is closed to the threshold value of the organic carbon saturation. The carbon sequestration potential of the study area is 241.57×106 t. Take the widely distributed chestnut soil as a case, it will take 18.66 years to reach saturation for the soil organic carbon reserves of chestnut soil. 相似文献
17.
Stable carbon isotope geochemistry provides important information for the recognition of fundamental isotope exchange processes related to the movement of carbon in the lithosphere and permits the elaboration of models for the global carbon cycle.Carbon isotope ratios in fluid-deposited graphite are powerful tools for unravelling the ultimate origin of carbon（organic matter,mantle,or carbonates） and help to constrain the fluid history and the mechanisms involved in graphite deposition.Graphite precipitation in fluid-deposited occurrences results from CO2- and/or CH4-bearing aqueous fluids.Fluid flow can be considered as both a closed（without replenishment of the fluid） or an open system（with renewal of the fluid by successive fluid batches）.In closed systems,carbon isotope systematics in graphite is mainly governed by Rayleigh precipitation and/or by changes in temperature affecting the fractionation factor between fluid and graphite.Such processes result in zoned graphite crystals or in successive graphite generations showing,in both cases, isotopic variation towards progressive l3C or 12C enrichment（depending upon the dominant carbon phase in the fluid.CO2 or CH4,respectively）.In open systems,in which carbon is episodically introduced along the fracture systems,the carbon systematics is more complex and individual graphite crystals may display oscillatory zoning because of Rayleigh precipitation or heterogeneous variations of 5’ C values when mixing of fluids or changes in the composition of the fluids are the mechanisms responsible for graphite precipitation. 相似文献
18.
The Changjiang， Huanghe， Zhujiang and Heilongjiang are the four largest rivers in China and they transport large amount of fresh water and terrigenous materials， including both inorganic and organic carbon into the ocean. The sources of the terrestrial carbon transported in the four rivers， however， have not been well constrained and compared. In this study， we used carbon isotopes （13C and 14C） combined with concentration measurements to investigate and compare the sources and fluxes of Dissolved Inorganic Carbon （DIC）， Particulate Inorganic Carbon （PIC）， Dissolved Organic Carbon （DOC） and Particulate Organic Carbon （POC） in the four rivers. The contributions of the potential sources to both DIC and DOC were quantitatively calculated using a dual isotope and three end member model. The results showed that the concentrations and isotope characteristics of the carbon pools in the river depended largely on the geological setting， surrounding environment and the anthropogenic influence of the drainage basins. Compared with other large rivers in the world， the concentrations of DIC in the Changjiang， Huanghe and Zhujiang were higher， but the DIC fluxes in the Huanghe and Zhujiang were lower. The DOC concentrations in the Heilongjiang River were higher and lower in the other three rivers compared with the average value of the world largest 25 rivers. The Changjiang， Huanghe and Zhujiang all transport millennia aged carbon. The old riverine DIC reflects the influence of chemical weathering of carbonate rocks and the old DOC reflects influence mainly from pre-aged soil OC. These ancient terrestrial carbon discharged by the rivers could have significant effects on the carbon cycle and ecosystems in the China's marginal seas. 相似文献
19.
地幔氧逸度与俯冲带深部碳循环 总被引：2，自引：2，他引：0
地幔氧逸度通过改变含碳相的存在形式和迁移方式来影响深部碳循环。本文结合最新的地幔氧逸度实验模拟和岩石学研究成果,探讨了地幔氧逸度时空分布对深部碳循环的影响。文章重点结合地幔减压熔融形成洋壳、新生洋壳蚀变、洋壳俯冲变质、深俯冲洋壳熔融以及俯冲洋壳物质(流体和固体)通过岩浆(岛弧和地幔柱)作用循环出地表等重要地质过程,探讨了伴随洋壳俯冲作用的深部碳循环过程。由于地幔氧逸度的时空变化,俯冲带含碳相表现出不同的存在形式和迁移能力。通过对西南天山俯冲带碳循环的岩石学和实验研究,我们认为应当进一步深入研究俯冲带氧化还原状态及其对俯冲带深部碳循环的影响。 相似文献
20.
应用金刚石压腔(diamond-anvil cell)实验技术,对草酸的稳定性进行了研究。草酸在高压低温条件下可以稳定存在,而在低压高温条件下将分解为CO2、H2O等气体。当成矿流体遇到破裂带或裂隙而发生减压沸腾时,可以使成矿流体中的有机络合物迅速发生分解产生大量CO2,从而造成金属元素在有利的空间沉淀、富集成矿。同时,实验研究了高温高压条件下CO2的物理化学性质,得到了CO2包裹体压力计的测定方程:P(MPa)=271.517·(Δν1381.93-0.010987·ΔT)+0.1,式中Δν1381.93(cm-1)为待测包裹体中CO2的拉曼位移相对于常温常压下CO2的拉曼位移1381.93cm-1之差,ΔT(℃)为待测包裹体的温度与常温(23℃)之差,P(MPa)为待测包裹体的内压。由上式计算拉曼位移ν的标准偏差为±0.2cm-1,压力P的误差为±54MPa。该压力标定方程适用于在高压下温度范围为23℃≤T≤390℃的压力标定。 相似文献