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1.
We first report discovery of the spinel-garnet-orthopyroxene granulite with pure CO2 fluid inclusions from the Fuyun region of the late Paleozoic Altay orogenic belt in Central Asia, NW China. The rock is characterized by an assemblage of garnet, orthopyroxene, spinel, cordierite, biotite, plagioclase and quartz. Symplectites of orthopyroxene and spinel,and orthopyroxene and cordierite indicate decompression under UHT conditions. Mineral chemistry shows that the orthopyroxenes have high XMg and Al2O3 contents (up to 9.23 wt%). Biotites are enriched in TiO2 and XMg and are stable under granulite facies conditions. The garnet and quartz from the rock carry monophase fluid inclusions which show peak melting temperatures of around -56.7 ℃, indicating a pure CO2 species being presented during the ultrahigh-T metamorphism in the Altay orogenic belt. The inclusions homogenize into a liquid phase at temperatures around 15.3-23.8℃ translating into CO2densities of the order of 0.86-0.88 g/cm3. Based on preliminary mineral paragenesis, reaction textures and petrogenetic grid considerations, we infer that the rock was subjected to UHT conditions. The CO2-rich fluids were trapped during exhumation along a clockwise P-T path following isothermal decompression under UHT conditions. 相似文献
2.
根据野外地质特征,大别山燕子河云斜煌岩脉是与燕山期后造山中酸性岩浆活动有时空联系的。所以,云斜煌岩脉及与其有成因联系的以减压为标志的麻粒岩相变质也发生在燕山期。云斜煌岩在矿物构成、岩石结构、岩石化学(主元素、稀土模式和微量元素蜘蛛图解)的特点都归属钙碱性煌斑岩,但它可能不是金的矿源。其SiO2含量和镁质指数偏低、CaO含量较高、缺乏高压矿物捕虏晶以及黑云母成分富钛指示的低压结晶条件表明它与原生基性岩浆有直接成因联系的可能性不大;相反它可能代表后来中酸性岩的母岩浆。其黑云母成分富钛指示的高氧逸度条件、岩石化学准铝型、稀土模式强烈右倾、耦合的TNT负异常等特征指示成岩中有陆壳物质(泥质或泥灰质)掺入。云斜煌岩浆的形成可能与大别碰撞造山带后造山伸张时减薄地壳在挥发份作用下减压重熔有关。 相似文献
3.
Discovery of ultrahigh-T spinel-garnet granulite with pure CO<Subscript>2</Subscript> fluid inclusions from the Altay orogenic belt,NW China 总被引：1，自引：0，他引：1
We first report discovery of the spinel-garnet-orthopyroxene granulite with pure CO2 fluid inclusions from the Fuyun region of the late Paleozoic Altay orogenic belt in Central Asia, NW China. The rock is characterized
by an assemblage of garnet, orthopyroxene spinel, cordierite, biotite, plagioclase and quartz. Symplectites of orthopyroxene
and spinel, and orthopyroxene and cordierite indicate decompression under UHT conditions. Mineral chemistry shows that the
orthopyroxenes have high XMg and Al2O3 contents (up to 9.23 wt%). Biotites are enriched in TiO2 and XMg and are stable under granulite facies conditions. The garnet and quartz from the rock carry monophase fluid inclusions which
show peak melting temperatures of around-56.7°C, indicating a pure CO2 species being presented during the ultrahigh-T metamorphism in the Altay orogenic belt. The inclusions homogenize into a
liquid phase at temperatures around 15.3–23.8°C translating into CO2 of the order of 0.86–0.88 g/cm3. Based on preliminary minerals paragenesis, reaction textures and petrogenetic grid considerations, we infer that the rock
was subjected to UHT conditions. The CO2-rich fluids were trapped during exhumation along a clockwise P-T path following isothermal decompression under UHT conditions.
Project supported by the National Basic Research Program (973) of China (No. 2001CB409801), the Exemplary Young Teacher Education
and Scientific Research Award Plan of China University, and Postdoctoral Fund of China (No. 2003033033), Postdoctoral Fund
of Zhejiang Province, and Starting Fund of Education Ministry, China 相似文献
4.
海拉尔盆地贝尔凹陷火成岩主要为爆发相、火山沉积相的熔结凝灰岩、凝灰岩,其次是溢流相的中基性安山岩、玄武岩,还发育少量浅层侵入岩．统计结果显示：溢流相火山岩与砂砾岩电性值有明显差别,在地震相上容易识别;爆发相熔结凝灰岩不易识别．安山岩、玄武岩等在地震剖面形态上具有较连续明显的顶底反射界面,内部成层较差、反射杂乱． 相似文献
5.
在研究猪分子标记遗传距离同杂种优势的关系时,对模板浓度和纯度、引物浓度、dNTP浓度、Mg2+浓度、不同商标的Tag酶等影响RAPD扩增的因素进行了系统的分析,在此基础上建立了适宜于本实验室研究的最佳RAPD技术体系:25(1反应体系中,含10×buffer2.5(I,MgCl21.75mmol/L,dNTPO25mmol/L,引物0.24(mol/L,Tag酶2U,模板50～100ng,1(g/(IBSA。反应程序为:94℃预变性5min,然后94℃变性1min,36℃退火1min,72℃延伸2min40个循环,最后在72℃延伸10min。 相似文献
6.
The western Iratsu mass, the largest tectonic body in the Sambagawa metamorphic belt, central Shikoku, is mainly composed of epidote amphibolite with minor amounts of eclogite. Systematically, a majority of garnets show bell-shaped chemical zoning of pyrope contents and Mg/(Mg Fe2 ) monotonously increasing outward. The grossular component in zonal garnet increases outwards, maximizes at an intermediate part, and then decreases towards the outermost rim, reflecting a process from increasing to decreasing pressure conditions during the prograde metamorphism. Jadeite contents of omphacite range from 25～20mole% within the cores to 15～10 mole% at the rims, implying a pressure-decreasing process (from 11 × 105 Pa to 8 × 105 Pa). The peak pressure-temperature (P-T) condition of 630～680 ℃ and ca. 15× 105 Pa in the western Iratsu mass is much higher than that of (610±25) ℃ and (10± 1)× 105 Pa of the Sambagawa oligoclase-biotite zone schists. The authors suggest a clockwise P-T-t path for the western Iratsu mass. 相似文献
7.
Fe-Cr-Ni heat resistant steels with different contents of Al and Si were cast in intermediate frequency induction furnace with non-oxidation method. With oxidation weight gain method, the oxidation resistance of test alloys was examined at 1 200℃ for 500 h. The effects of Al and Si on oxidation resistance were studied through analyses of X-ray diffraction (XRD) and scanning electron microscope (SEM). It is shown that the composition of oxide scales is a decisive factor for the oxidation resistance of heat resistant steels. The compounded scale composed of Cr2O3, ar-Al2O3, SiO2 and Fe(Ni)Cr2O4, with flat and compact structure, fine and even grains, exhibits complete oxidation resistance at 1 200℃ Its oxidation weight gain rate is only 0.081 g/(m2·h). By the criterion of standard Gibbs formation free energy, a model of nucleation and growth of the compounded scale was established. The formation of the compounded scale was the result of the competition of being oxidated and reduction among Al, Si, and the matrix metal elements of Fe, Cr and Ni. The protection of the compounded scale was analyzed from the perspectives of electrical conductivity and strength properties. 相似文献
8.
朱妙琴 《浙江教育学院学报》2012,(3):109-112
通过研究芹菜叶色素的提取工艺及稳定性,确定其提取的较佳工艺及稳定性的条件．采用乙醇溶剂振荡萃取法,在5l0nm波长下,通过单因素试验,确定该色素的较佳提取工艺;研究了不同情况下芹菜叶色素的稳定性．结果表明：该色素较佳提取工艺为体积分数85％乙醇溶液,料液比1：10,30℃,振荡30min．该色素耐光、耐热性较差;一些食品添加剂以及Zn^2＋、Ca^2＋、Mg^2＋、Na^＋对色素稳定性基本无影响,但Sn^2＋、Fe^3＋、Cu^2＋、Al^3＋会降低色素稳定性,加工使用过程中应避免与铜、铁、铝、锡容器接触． 相似文献
9.
The Mg-based hydrogen storage alloys Mg2Ni, Mg2Ni0.7Fe0.3 and Mgl.7Alo.3Ni were successfully synthesized by a two-step process （sintering and ball milling）. The crystal structure and microstructure were examined by X-ray diffraction, Scanning Electron Microscope and Malvern particle size analyzer. New phase appears in the tripe alloys doped with A1 and Fe, and the particle size ranges from 3μm to 5 μm. The electrochemical performance studies indicate that the partial substitution of AI for Mg, and Fe for Ni significantly improve the cycle life, reversibility of hydrogen absorption and desorption. The diffusion process is the control step in the electrode reaction of hydrogen storage alloys. 相似文献
10.
方法采用浓硝酸-高氯酸(V:V=4:1)常压微沸条件下消解柴胡样品,应用火焰原子吸收法(FAAS)测定柴胡中的金属元素Ca、Mg、Fe、Cu、Zn、Pb的含量,研究了测定不同元素的仪器最佳工作条件,并作了方法的准确性和精密度考察.结果:栽培柴胡中Ca、Mg、Fe、Cu、Zn的含量分别为4722.1、1823.0、710.1、21.5、21.9μg/g,Pb未检出.方法的加标回收率为97.57%～103.10%,相对标准偏差(n=9)为0.20%～2.68%.结论:测定方法简单易行,方便快捷,结果可靠. 相似文献
11.
Researchershavebecomeincreasinglyinterestedinironaluminideintermetallics (includingFe3AlandFeAl)since 1970sinviewofthecombinationoflowcost,lowerdensity ,remarkableresistancetoerosion ,sulfidizingandoxidizingathightemperature .However ,industrialap plicationofthesealloyshasbeenverylimitedduetotheirpoorductilityandfracturetoughnessatroomtemperatureaswellastheirdifficultyinshaping[1] .Somestudieshaveindicatedthatcoatingstructuralmaterialswithironaluminidesbyusingthermalsprayingwillnotonlysolveth… 相似文献
12.
范韵敏 《Journal of Zhangzhou Technical Institute》2012,14(2):20-25
通过盐析透析、离了层析、疏水层析,对链霉菌属发酵液中的阿魏酸酯酶（FAE）进行分离纯化。并进行酶学性质研究。得出的阿魏酸酯酶的纯化倍数为2．67,回收率为55．8％,酶分子约为30kDa。其最适反应pH约为6．0,最适温度约为50℃,金属离子Cu^2＋和Zn^2＋对阿魏酸酯酶酶活力均有明显的抑制作用,而Mg^2＋、Fe^2＋、Ca^2＋、Na^＋和Mn^2＋对酶的活性均有一定的促进作用。 相似文献
13.
白岚 《周口师范学院学报》2007,24(5):101-102
对香菇中某些营养成分与药用成分进行了测量，分析结果表明，香菇含有丰富的营养成分，具有高蛋白、低脂肪的特点，并含游离氨基酸、可溶性糖、可溶性蛋白以及某些微量金属元素（如Ca，Cu，Fe，Mg，Mn，Zn等），此外，香菇还含多糖类物质，这是其具有抗癌作用的药效成分. 相似文献
14.
焦华 《渭南师范学院学报》2012,(6):64-67
通过Fe与C4H4O6Na2溶液在140---220℃水热反应12h,可控合成了α-Fe2O3纳米材料．通过控制C4H4O6Na2的加入量可控合成了纳米球、纳米棒和纳米带等纳米结构单元．采用x射线衍射仪和扫描电镜对产物进行表征．结果表明,在140--220℃反应得到的产物纯净,没有任何杂质峰,均为菱方相结构． 相似文献
15.
傅志军 《陕西理工学院学报(社会科学版)》1998,(3)
太白红杉是秦岭太白山森林生态系统中的一个正常的成熟种群．它在系统内各个层次和各体积级中都具有相当数量的个体,显示出种群在系统内的优势地位．太白红杉叶中元素含量有着N＞Ca＞P＞Mg＞Fe＞Mn＞Zn的顺序,而土壤中元素含量顺序是N＞P＞Ca＞Gg＞Fe＞Mn＞Zn．影响太白红杉种群结构的根本原因不是土壤中元素舍量大小,而是海拔高度的变化引起生境条件的变化所致． 相似文献
16.
属间远缘杂交水稻耐铁毒性研究 总被引：4，自引：0，他引：4
以吉田昌—培养液为对照，添加不同浓度ＦｅＳＯ４作为铁毒胁迫处理，对二个属间远缘杂交水稻“远诱１号”和“遗传工程水稻１号”及三系杂交组合“汕优６３”二叶龄幼苗进行耐铁毒性比较鉴定．试验结果表明，３个试验材料的耐铁毒性以高粱稻远诱１号及三系稻汕优６３较强，遗传工程水稻１号耐铁毒性相对较弱．根据溶液中Ｆｅ２＋／Ｆｅ３＋的变化规律，稻体内持铁量的差异，稻株根系氧化力的区别，拒斥可能是汕优６３的耐铁毒性生理基础，遗传工程水稻１号的耐性机制为容耐，而远诱１号的耐铁生理基础兼具拒斥与氧化双重机制而偏倚于主动氧化机制．体内钾、硅、镁、钙含量与铁离子含量密切相关，丰富的钾、硅、镁可以改善水稻的耐铁毒性 相似文献
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通过添加过量的稀土元素La,得到La1.2Fe13-xSix系列化合物在1100摄氏度下短时间退火后形成稳定的Na Zn1 3型结构相。分析还表明该系列化合物在Si含量较少时,含有少量的α-Fe相和富镧相。磁性测量表明居里温度随着Si含量的增加由183K近线性的增加到214K,热滞随着Si含量的增加而减小。在各自的居里温度附近观察到由磁场引起的变磁转变特性,且随着Si含量的增加而减弱。磁熵变的最大值随着Si含量的增加而减少。 相似文献
20.
用涂布平板法从温泉水中分离到1株产高温蛋白酶的嗜热菌,命名为P4.通过对菌株P4的生理生化试验和16S rRNA基因鉴定,初步确定其为一株嗜热脂肪地芽孢杆菌(Geobacillus stearothermophilus).菌株P4所产蛋白酶的最适反应温度在65-75℃之间,最适催化pH值为8.0,Zn2+、Mg2+对菌... 相似文献