泰国玄武岩红宝石的宝石学及化学成分特征

以产自泰国玄武岩的红宝石为研究对象,采用宝石学常规仪器、电子探针、LA-ICP-MS、紫外-可见光光度计、红外光谱、拉曼光谱等测试方法探究泰国红宝石的宝石学特征、化学元素特征、谱学特征,并与缅甸大理岩型红宝石、莫桑比克角闪岩型红宝石初步对比,分析产地特征。研究结果表明,泰国红宝石颜色较深,紫外光长波下多呈中等-弱红色荧光,短波下呈惰性;内部包裹体丰富,可见多种形态的固态、流体包裹体,双晶发育;化学成分主要为Al₂O₃,含有Cr、Fe、Ti、Mg、V、Ga、Si、Ni等微量元素,以高Fe、高Mg、低Ga为特征。紫外-可见光吸收光谱为Cr+Fe谱,Cr相关荧光峰较弱,红外光谱测试样品为红宝石,拉曼光谱存在6个振动峰,与刚玉标准拉曼光谱重合度较高。通过对红宝石的外观、荧光性、内部所含固态包裹体、流体包裹体种类及形态可对红宝石初步进行产地鉴别;微量元素Cr、Fe、Mg、Ga、V、Ti含量具有明显产地特征;不同产地红宝石的紫外-可见光光谱在吸收峰值上略有差异。     

泰国湾西部表层沉积物自生矿物分布及组成

Generation, morphology, and distribution of authigenic minerals directly reflect sedimentary environment and material sources. Surface sediments were collected from the western Gulf of Thailand during 2011–2012, and 159 samples were analyzed to determine detrital minerals. Authigenic minerals, including siderite, pyrite, and glauconite, are abundant whereas secondary minerals, such as chlorite and limonite, are distributed widely in the study area. Siderite has a maximum content of 19.98 g/kg and appears in three types from nearshore to continental shelf, showing the process of forming-maturity-oxidation. In this process, the Mn O content in siderite decreases, but Fe_2O_3 and Mg O content increase. Colorless or transparent siderite pellets are fresh grains generated within a short time and widely distributed throughout the region; high content appears in coastal area where river inputs are discharged. Translucent cemented double pellets appearing light yellow to red are mature grains; high content is observed in the central shelf. Red-brown opaque granular pellets are oxidized grains,which are concentrated in the eastern gulf. Pyrite is mostly distributed in the central continental shelf with an approximately north–south strip. Pyrite are mainly observed in foraminifera shell and distributed in clayey silt sediments, which is similar to that in the Yangtze River mouth and the Yellow Sea. The pyrite in the gulf is deduced from genetic types associated with sulfate reduction and organic matter decomposition. Majority of glauconite are granular with few laminar. Glauconite is concentrated in the northern and southern parts within the boundary of 9.5° to 10.5°N and is affected by river input diffusion. The distribution of glauconite is closely correlated with that of chlorite and plagioclase, indicating that glauconite is possibly derived from altered products of chlorite and plagioclase. The K_2O content of glauconite is low or absent, indicating its short formation time.     

An Analysis of Typhoon Chanthu in June 2004 with Focus on the Impact on Thailand

In this paper,the influence of Typhoon Chanthu on Thailand during June 2004 was studied.Several major features have been revealed.(1) Chanthu formed and developed in favorable large-scale conditions.A continental high-pressure system covered most of China and merged with the West Pacific Subtropical High to become a west-east oriented high-pressure band,which was responsible for the westward movement of the typhoon.(2) There existed a stationary and active ITCZ,which was the preferred formation area of the ...     

到普吉岛做条快乐的鱼

被誉为“泰南珍珠”的普吉岛是泰国南部最著名的观光地区，比曼谷的国际知名度还要大。面积为578平方千米的普吉岛是泰国76个省中唯一的岛屿省，坐落于安达曼海域中，只有一座大桥与陆地相连，周围分布着大大小小的几十个小岛。     

东南亚华人族群融入移入国主流社会的比较研究——以印尼与泰国作对比分析

东南亚是海外华人华侨社会历史最悠久、人口最多、经济角色十分突出的地区。总体上,华人华侨与所在国原住民和睦相处,已逐步融入主流社会,为当地社会进步做出了贡献。但由于各国历史发展不同,华人与所在国原住民融合程度大不相同。本文以印尼与泰国相比较,探讨华人与原住民融合状况,并从政治经济和社会文化因素等方面对造成悬殊差别的原因进行了分析     

易县地震台2004年印尼8．7级地震形变观测报告

河北省易县地震台位于保定市西北部，在易县县城西20km处，见图1。前兆手段多而全，包括体应变仪、伸缩仪、自记水管倾斜仪、垂直摆倾斜仪、跨断层短水准、甚宽带地震计、强震计，属形变综合台，是国家基本台。     

克什克腾世界地质公园

克什克腾世界地质公园位于内蒙古自治区东部赤峰市西北部克什克腾旗境内，地处大兴安岭山脉、燕山山脉和浑善达克沙地三大地貌结合部。独特地理位置、特殊的地质结构造就了丰富独特的地质遗迹资源。     

甘肃西北部黑河流域中游地表径流和地下水补给变异特征

大量实际资料和综合研究表明,在西北内陆区当人类活动影响强度超过37%时,地表径流过程由天然状态转变为以人为干扰为主,不仅造成下游区获得的地表径流量大幅减少,而且中游区地下水补给也失去自然特征,补给量明显减少,同时还影响地下水径流过程及其溢出量衰减,进而导致下游区生态环境需水更加紧缺和退化。调控中游区安全引水量和调整中游区种植产业结构,发展节水型农业,是解决黑河流域下游区生态环境问题的关键。