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31.
Diagenesis and Porosity of the Cambrian‐Ordovician Carbonate Shoal Facies at Yangjiaping,Shimen, Hunan 总被引：3，自引：0，他引：3
Abstract: Upper Cambrian‐Lower Ordovician shoal‐facies carbonate rocks are well developed in the Yangjiaping section, Shimen, Hunan, and their types are also highly varied. There are both monomictic shoal‐facies rocks (e.g. sparite oolitic limestone and sparite calcarenite) and polymictic shoal‐facies rocks (e.g. grainstone, whose grain types include sand‐ and pebble‐sized fragments, bioclasts, oolites, algal mats etc.). What is different is that the Upper Cambrian shoal‐facies rocks have been mostly strongly dolomitized into shoal‐facies dolomite with various residual textures. This paper presents an in‐depth study of various kinds of diagenesis and pore space evolution occurring in this section and suggests that the diagenetic sequences of shoal‐facies rocks in the study area is dominantly of retrogressive type. 相似文献
32.
对特效时号--光源灯控仪的技术改进 总被引：1，自引：1，他引：0
针对石英丝倾斜仪原配新式时号—光源灯控制器在工作中的缺陷 ,提出了对特效时号—光源灯控仪的技术改进方案。改进后的仪器具有电路设计简单、抗干扰能力强 ,有自动恢复和自律自保等功能 ,实验表明改进后的仪器当全部使用甲电池时 ,综合效率比原仪器提高了 2 0倍 相似文献
33.
碳酸盐岩中氧、碳稳定同位素与古盐度、古水温的关系 总被引：40，自引：3，他引：40
一、概论 近年来,岩相古地理研究的意义已渐增大,进展甚速,其中用δ13C、δ18O值确定古盐度、古水温的方法引起了国内外学者的重视。事实证明,在一定条件下,这是恢复古环境的有效标志。 相似文献