陕西柞山地区钠长碳酸角砾岩的成因及形成机制

柞山地区钠长碳酸角砾岩是汉体隐爆角砾岩。岩石化学特征反映钠长碳酸角砾岩不同于沉积碳酸盐岩,而与岩浆碳酸岩基本一致。稳定同位素资料表明,钠长碳酸角砾岩的物质来源既有深源岩浆,也有基底地层。稀土元素特征反映出钠长碳酸角砾岩与岩浆活动有成因联系。在此认识的基础上,结合其地质特征探讨了钠长碳酸角砾岩的形成机制。     

塔里木库车坳陷中新生界储层砂岩成岩期钠长石化

库车坳陷中新生界以陆相碎屑建造为主,在该区储层砂岩中,钠长石为广泛存在的自生矿物之一。显微结构证据显示,成岩期钠长石交代长石等碎屑,或呈细小自形晶填隙产出,在化学成份上,钠长石与被交代的长石存在过渡关系。在碎屑长石钠长石化过程中,母体相的溶解速率大于钠长石的沉淀速率,并伴有石英,高岭石等矿物的消耗,因此有助于次生孔隙的发育及储层物性的改善。从高岭石的垂向分布,以及钠长石相对含量与埋深的关系,可以看出钠长石化作用主要发生在探成岩(mescdiagenesis),对应于4 000-5 500m埋探,和90℃ ～110℃ 地温带 在库车和塔北地区,主要工业油气藏亦集中分布在这一深度带。     

云南牟定地区巨粒晶质铀矿成因新认识:一种与钠长岩有关的新型铀矿化

云南牟定地区产出世界罕见的巨粒晶质铀矿,且具有极其特殊的"晶质铀矿—金红石(大量)—锆石(少量)"矿物组合形式,对于这种特殊铀矿化的成因及巨粒晶质铀矿的形成机理等问题谜一样困扰学界多年。近年来,经岩石学、矿物学、岩石地球化学,同位素地质学及年代学等综合研究,确认含铀的围岩为钠长岩,主要由钠长石(平均An=3.36)组成,Na_2O平均含量为7.91%,属碱性(平均σ=5.84),强过铝(A/CNK≥1.10),具有高分异指数(平均DI=82.39%)、长英指数(平均FL=88.39%)、镁铁指数(平均MF=84.92%)及低的固结指数(平均SI=5.06%)的特征,且具有极低的稀土含量(平均∑REE=162)。[n(~(87)Sr)/n(~(86)Sr)]_i均大于0.710,具有壳源特征,形成年龄(锆石SIMS年龄测试结果为1057 Ma)与水桥寺岩体(1038～1070 Ma)接近,是水桥寺高分异岩体由黑云母微斜长石花岗岩—含黑云母微斜长钠长花岗岩—钠长花岗岩—钠长岩的演化分异过程中最远端产物。晶质铀矿稀土配分模式及成分特征与典型岩浆型铀矿床一致,其形成于高温(平均662.19℃)的地质环境中,铀矿物与钠长岩具有同源、同演化及近于同时形成的特征,进而确定牟定地区铀矿化为一种与钠长岩有关的新的铀矿化类型,具有岩浆分异成因特征。Ti对U的络合、迁移及巨粒晶质铀矿形成起了至关重要的作用。此外,岩体演化分异过程中不仅控制铀矿化的产出,同时钠长花岗岩阶段还有Nb、Ta矿化产出。     

中药熏蒸联合五水头孢唑林钠治疗老年肛肠疾病术后切口感染46 例

目的：观察中药熏蒸联合五水头孢唑林钠对老年肛肠疾病术后切口感染的疗效及安全性。方法：将肛肠疾病术后切口发生感染的老年患者92例随机分为治疗组和对照组,每组各46 例。对照组予以五水头孢唑林钠治疗,治疗组在对照组基础上予以中药熏蒸治疗,比较2组综合疗效、症状缓解时间以及安全性。结果：总有效率治疗组为97.83%（45/46）,对照组为86.96%（40/46）,2组比较,差异有统计学意义（P＜0.05）。治疗组的切口渗出物、疼痛、水肿缓解时间及切口愈合时间均短于对照组（P<0.01）。不良反应发生率治疗组为2.17%（1/46）,对照组为13.04%（6/46）,2组比较,差异有统计学意义（P＜0.05）。结论：中药熏蒸联合五水头孢唑林钠治疗老年肛肠疾病术后切口感染,提高了临床疗效,缩短了切口感染时间,且不良反应较少。     

火焰原子发射光谱法测定碳化钛中微量钠

对火焰原子发射光谱法测定碳化钛中微量钠的条件进行了试验。样品用硝酸-氢氟酸溶解，在0．30mol／L硝酸介质中，以硝酸钾作消电离剂消除钠的电离干扰，饱和硼酸溶液络合试液中过量的氟离子。方法检出限为0．015μg／mL，样品加标回收率为97．6％-105．6％，方法的精密度（RSD，n=6）小于2．5％。     

某蚀变花岗岩型铌钽矿床中钠长石化和天河石化

A Nb-, Ta-, rare metal deposit has been discovered in a albitization-, amazonitization-granite by using amazonite as an indicator. The ore-bearing dyke, early Yanshanian in age, occurs in a Late Jurassic metamorphic sandstone and breccia. Three stages of albite can be distinguished, showing regular variation in composition, optical property and structure with respective to different generations. Two generations of amazonite are noticed and studies are made on their composition and structure by using optical and X-ray diffraction methods. Amazonite is readily recognizable in the field by its colonr. Its occurrence with albitization can be used as a prospecting indicator for Nb, Ta and other rare metals.     

沉积岩中镁钠闪石石棉矿物的初步研究

Alkali amphibole asbestus is widely distributed in a Mesozoic terrestrial redbed.Preliminary mineralogical study shows that it belongs to magnesian riebeckite asbestus. The mineral contains higher Na, Mg and Fe^3 , lower Al, and is well comparable with that of typical magnesian riebeckite asbestus in chemical composition. A comparasion between the methods used for calculating the crystallochemical formula of amphibole indicatesthat the structural characteristics of amphibole can be best brought out if a total catian number of 15, i.e., x y z=15, is taken as the factor for magnesian riebeckite. The infrared spectra for fibrous magnesian riebeckite exhibit two definite absorption bands. The firat one is at 850--1250 cm^-1, involving several minor bands due to the valency vibration of Si--O, with maximum values of 975,1025, 1080cm^-1 respectively. The second absorption band which is attributable to the distortional vibration of Si--O--Si, is detected at 350--600cm^-1, with a maximum value of 440cm^-2. Optically, its refractien iadices bacrease with increasing transition elements, especiany the ratio of Mg/Mg Fe^2 Fe^3 Mn. A distinct exothermic effect is observed between 350--400℃, indicating the oxidation of Fe^3 to Fe^3 . A deep endothermic valley between 970--1020℃ can be attributed to the melting of magnesian riebeckite and the formation of new minerals. The auther oonsideres that fibrous magnesian riebeckite is crystallized in favorable accumulation strata from a Na-, Mg-, Fe-rich silicate colloidal solution that has been derived from country rocks by some alkline ground water duringg the process of sedimentation and diagenesis in terrestrial saline carbonate muds. Magnesian riebeckite formed at terrestrial carbonate saline formations promises to be a potentially important genesis type for alkali amphiboles.     

萨日达拉金矿成矿特征及成因探讨

萨日达拉金矿床位于伊犁板块和准噶尔板块的接合部位,严格受冰达坂韧-脆性剪切带控制,具体产出部位为韧性剪切带内次级剪切带:含矿岩石为糜棱岩、糜棱岩化岩石:矿床与黄铁矿化、钠长石化、硅化等关系密切;矿床异常Au下限为10×10-9;元素组合为Au、As、Ag、Zn.