白云母-金红石质图章石的矿物学特征     

李金檑  刘云贵 《矿物岩石》2023,(2):11-17

绿色图章石是我国众多图章石品种中的重要类别，四川“雅安绿”即为其中一个代表性的品种。近期国内珠宝市场出现了一种被称为“雅安绿”新亚种的图章石且广受关注，其外观为微透明的绿黄色基体上分布绿色半透明的纹脉，图案精美。本次研究采用偏光显微镜、X射线粉末衍射仪、电子探针仪、红外吸收光谱仪、激光拉曼光谱仪和紫外-可见光分光光度计对该种图章石的矿物组成、化学成分、谱学特征和颜色成因进行研究。结果表明，该图章石绿色纹脉的主要矿物成分为微晶白云母，绿黄色基体主要由微晶白云母和金红石组成，纹脉白云母中可充填有细脉状的绿泥石。明确了该图章石中白云母的多型类型为2M₁型，白云母的晶胞参数为a=0.514(2) nm、b=0.906(4) nm、c=2.015(6) nm、β=95.3(3)°,金红石的晶胞参数为a=b=0.460(2) nm、c=0.295(1) nm,计算其分子式为(K_0.82Na_0.08)(Al_1.80Fe_0.17Mg_0.03)(Al_0.93  相似文献   

提高安全意识 从源头防止油泄漏污染——来自三例油管泄漏污染事件的启示     

陈明  冯雪 《今日国土》2010,(2):38-40

在高速发展的现代社会,石油作为一种重要的能源,社会发展乃至个人生活都与之息息相关。目前,社会对石油的使用量巨大,油泄漏事件时常发生,而油泄漏可能导致海洋污染、水污染、土壤污染、空气污染等。我国每年因工厂石油管道泄露、工厂排污等造成的油污染事故屡见不鲜。本文列举三起油泄漏事件,事故发生后,相关部门迅速应急并妥善处置了污染事件,但也暴露了一些问题,如输油管道管理和安全责任意识等。油泄露并不是不可控制、不可防止的,提高安全意识,加强石油运输管理,就可从源头减少甚至避免油泄漏事件。  相似文献   

石油污染对黄河口沉积物工程性质的影响     

王林昌  袁守启  邢可军 《中国海洋大学学报(自然科学版)》2010,40(1)

对黄河口胜利油田某油井附近沉积物进行石油污染状况调查研究,采用坑探试验现场调查污染范围,发现油井沉积物在一定范围内存在石油污染,污染多在0.2～1.5 m深度内,水平距离在140～440 m之间.原位测试污染沉积物强度,取样进行室内石油浓度和沉积物物理力学指标测试.石油污染沉积物物理力学性质与未污染的有较大差别,污染后沉积物的重度、渗透系数和强度等均有所降低.污染后的沉积物结构,多成块状和板状结构.  相似文献   

海南昌江沿岸海域石珊瑚的物种多样性及其分布     

牛文涛  张潇娴  林荣澄  王初升 《台湾海峡》2010,29(3):389-393

2009年3月,采用水下照相及摄像方法,对海南昌江沿岸海域的石珊瑚物种多样性、分布及覆盖度进行了调查.结合历史资料,共发现石珊瑚10科15属28种和1未定种.其中鹿角珊瑚属（Acropora）、角蜂巢珊瑚属（Favites）、叶状珊瑚属（Lobophyllia）等为优势类群,常见分布珊瑚种类有角孔珊瑚（Gonioporasp.）、标准蜂巢珊瑚（Favia speciosa）、五边角蜂巢珊瑚（Favites pentagona）、多孔鹿角珊瑚（Acropora millepora）、十字牡丹珊瑚（Pavona decussata）、伞房叶状珊瑚（Lobophyllia corymbosa）等.石珊瑚主要分布于海尾镇三联村以南海域,覆盖率最高为12%.本次调查在海南昌江沿岸海域记录的珊瑚种类数多于以前的记录,但少于海南南岸的三亚鹿回头,也少于北部的广西涠洲岛、广东徐闻、香港等海域,随着调查次数的增加,预计会有更多的种类被发现.该海域是北部湾珊瑚幼虫交流的中间过渡区,对珊瑚礁的保护与恢复具有重要意义.  相似文献   

SOME OBSERVATIONS ON THE OLDEST FORMATIONS IN THE PROVINCE OF SHANSI.     

初健孫 《地质学报》1928,7(3)

The western and north-eastern parts of Shansi Province are districts of typical development of the oldest Pre-Palaeozoic formations. In western Shans these formations are well exposed in the territory midway between the Taiyuan plain and the Yellow River and are bordered on almost all sides by the so-called Shansi Formation of late Palaeozoic age. Near the margin the area of oldest  相似文献   

QUATERNARY GLACIATION IN THE YANGTZE VALLEY     

李四光 《地质学报》1934,(0)

Eleven years ago when this society held its Third General Meeting I had the opportunity of calling your attention to certain strange deposits and topographical features that came under my notice in certain parts of North China. I showed you a number of striated boulders that could not be attributed to mere  相似文献   

DATA RELATING TO THE STUDY OF THE PROBLEM OF GLACIATION IN THE LOWER YANGTZE VALLEY     

李四光 《地质学报》1934,(1)

In a commemorable evening—I believe it was in the early part of December, 1933—when I happened to discuss the problem of Pleistocene climate in China with the late Dr. Davidson Black, I informed him, without  相似文献   

DISTRIBUTION OF THE DOMINANT TYPES OF THE FUSULINOID FORAMINIFERA IN THE CHINESE SEAS     

李四光 《地质学报》1931,(1)

Since the publication of the Fusulinidae of North China much information has been obtained from the southern seas of this country of the Carboniferous and Permian Periods. We are now in the position to form a birds eye  相似文献   

ON THE OCCURRENCE OF SPHAEROSIDERITE IN A SUBBITUMINOUS COAL FROM HSIAN COAL MINE,LIAONING PROVINCE     

謝家榮 《地质学报》1933,(1)

Mr.T.F.Hou,geologist of the National Geological Survey of Chinabrought back in 1931 from Liaoning province,a specimen of subbituminous coalin which are included patches or aggregates of small oolites.This interestingspecimen was given to the writer for microscopical investigation.Both polished  相似文献   

Proceedings of the Twentieth Annual Meeting     

《地质学报》1944,(Z1):1-9

正 Morning Session of Saturday,April 1. President Y. C. SUN, in the chair. The Twentieth Annual Meeting of the Geological Society of China was called to order by the President at 9 a.m. in the Science Building at Kueiyang, The President expressed his satisfaction to see a large number of members and guests  相似文献