云南磷矿之成因及时代

云南产磷矿之区域甚多,矿地之农人,常用之作为简单肥料。但有多处,虽产磷矿,而当地农人反不知利用,恐为各处土壤性质互有差异之故。是应参考土壤调查者之结果,始能明瞭。     

PROCEEDINGS OF THE SECOND ANNUAL MEETING OF THE GEOLOGICAL SOCIETY OF CHINA, HELD IN PEKING, JANUARY 5, 6, AND 7, 1924.

Morning Session of Saturday, January 5. President V. K. Ting in the Chair. The first session of the Second Annual Meeting was called to order at 10 o'clock a. m., Saturday, January 5 in the Library Building of the National Geological Survey of China, Peking, by President Dr, V. K. Ting.     

北京区年会论文节要

本矿区位于清原县城北约二公里,地形上为一状年期之山地,山峰海拔多在三七○至四五○公尺之间,距选矿广甚近,露出地层以侏罗至白垩纪之红色岩层花岗岩及变质岩为主,河沟中有第四纪及近代沉积之砂砾层,中含砂金,构造上有二逆掩断层     

Magnetite Quartzite-Type Iron Ores – China’s Most Important Current Iron Ore Source

正China is abundant in iron-ore resources,with proven ore reserves of 576.62×108 t and proven reserves of 210×108 t,containing an average iron content of 33%.However,the rich iron-ore reserves of 10.85×108 t only account for 1.9%of all proven reserves.China’s iron-ore resources are characterized by many lean ores and a few rich ones.     

乐都地区建材用石英岩矿开发利用探讨

通过对乐都县石英岩矿的成矿地质背景及石英岩矿矿石特征的分析及矿石开发利用过程中发现的问题,探讨石英岩可开发利用的方向,并对未来矿床勘查工作中应注意研究评价提出几个方面的建议。     

马鬃山南金山金矿区深部找矿钻探技术研究与应用

本文通过对该地区钻探工艺进行分析,地层结构的介绍,钻孔易坍塌,采用套管护壁,金刚石钻头克取石英岩石的钻进效率分析,对矿区水质的检测,根据所出现的钻探问题,现场及时分析原因,采取有针对性的工艺措施,有效地解决了这些问题,圆满完成了施工任务。     

A TEM Study on Fluid Inclusions in Coesite-bearing Jadeite Quartzite in Shuanghe in the Dabie Mountains

Fluid inclusions at a nano to sub-micron scale in quartz from jadeite quartzite at Shuanghe, Dabie Mountains, have been investigated by using the transmission electron microscopy (TEM). Most fluid inclusions are spherical or negative crystal shaped, forming wide swarm-like trails. The TEM reveals that the relationship between coesite and the host quartz is syntaxic and provides strong evidence of the occurrence of high-salty fluids at peak metamorphic conditions. The fluid inclusions are often connected to dislocations, which are undetected at the scale of optical microscopy. Non-decrepitation leakage of fluid inclusions may occur by pipe diffusion of molecule H2O or CO2 along dislocations from the inclusions into the host quartz, thus leading to original inclusion density and composition changes. It should be taken into full account for the correct petrological interpretation of micro-thermometric results.     

大陆俯冲带大规模的变质流体活动:来自大别造山带超高压硬玉石英岩的记录

硬玉石英岩是一种稀少且与流体作用相关的变质岩,同时出露于高压或超高压洋壳和陆壳俯冲带中.通过对中国东部大别造山带中出露达50 km2的含柯石英的超高压硬玉石英岩进行研究,综合全岩主微量元素、矿物Mg-O同位素和锆石学研究.结果表明,硬玉石英岩的原岩为古元古代TTG岩石,经历过弱化学风化和强物理风化作用,然后在三叠纪时期受到围岩富黑云母片麻岩分解脱水而产生的大量重Mg同位素流体交代,从而形成硬玉石英岩.考虑到这种受流体交代成因的硬玉石英岩在大别山广泛出露,表明其在三叠纪大陆深俯冲过程中存在着大规模的变质流体活动,这项研究首次报道了大陆俯冲带有大规模的流体活动存在,同时也挑战了传统观点认为的大陆俯冲带缺乏岛弧岩浆作用主要原因是缺乏足够量的流体活动.      

华中高压－超高压变质富铝岩石的温压条件研究及其地质意义

华中高压－超高压变质富铝岩石为陆壳岩石经变质而成，其典型的岩石类型为蓝晶石黄玉石英岩。矿物温压计估算其ｐ－Ｔ条件为Ｔ＝７００℃，ｐ＝１．２ＧＰａ；高温高压实验结果表明，蓝晶石＋黄玉组合在Ｔ＝１０００～１２００℃，Ｐ＝３．１～３．７７ＧＰａ范围内可以稳定存在，是高压－超高压变质作用产物。在蓝晶石石英岩中发现柯石英及柯石英假象，区域上其它岩石组合也有高压－超高压变质作用的证据。变质富铝岩石为榴辉岩相变质作用产物，从而证明陆壳岩石可以经历＞２．０ＧＰａ的变质压力条件。