tufa

1. The delicate white tufa towers formed where freshwater springs percolate up from the bottom of the lake.
   柔和、白色的钙华塔形成于淡水泉从湖底渗透出来的地方。
2. The more recent calcareous, or calcium carbonate, deposits that make up the tufa formations are closer to the bottom and lighter in color.
   钙质或碳酸钙越近现代，所构成凝灰岩地层的沉积物越靠近底部，颜色也比较浅。
3. The torrent flowed along the surface of the hardened tufa, and destroyed the few meager skeletons of trees which had withstood the first eruption.
   洪流沿着凝固了的凝灰岩表面流去，把第一次火山爆发以后残存下来的几棵干枯的树干都摧毁了。
4. These pale gray and ivory "tufa towers," located in California's Mono Lake, may look like eerie art instillations, but they occur naturally and are made of limestone.
   这些浅灰色和象牙形的“钙华塔”，位于美国加州的莫诺湖，它们可能看起来像是令人毛骨悚然的艺术灌注物，然而它们是在自然界里由石灰岩所构成的。
5. It was found by in-situ monitoring that the Xiangshui River has a very low concentration of calcium and bicarbonate, which does not match with the huge tufa deposits in the riverbed and the dense vegetation cover in surrounding area.
   文章报道了响水河河水的现场监测结果，得到响水河河水的Ca2+和HCO-3非常低，这明显与河床中大规模钙华的存在和景区内发育的茂密植被不匹配；
6. Tufa, as a product of karstification, is a carbonate sediment in pools, rivers, or springs.
   钙华作为岩溶作用的产物，又称泉华或石灰华，是指湖泊、河流或泉水所形成的以碳酸钙为主的碳酸盐沉积物。
7. Characteristics of ancient tufa and its prospecting signifcance in Northwest Hunan
   湘西北地区的古硅华特征及其找矿意义
8. Accordingly, the development process model of calcareous tufa is proposed preliminarily.
   文中还初步提出研究区微生物（蓝藻等）起控制作用的石灰华发生和形成过程模式。
9. So, the appropriate geochemical condition and the advantaged water dynamic condition compose the growth of the tufa of Wang 4 well.
   王4井的地热流体正是具备了合适的水化学条件，同时伴随着有利的水动力条件才生成了我们所看到的钙华。
10. The floristic characteristics of tufa bryophytes and the main Travertine Deposition types in UK
    英国钙华苔藓植物区系特征及其主要钙华沉积类型
11. The study of aeration effect on Mechanism of fluvial tufa deposit
    河成石灰华成因&掺气效应研究
12. Deep-source co_2 in natural waters and its role in extensive tufa deposition in the Huanglong ravines, sichuan, China
    四川黄龙沟天然水中的深源CO2与大规模的钙华沉积
13. According to previous researches, tufa results from the supersaturation of calcium carbonate, as the partial pressure of CO_2 in the spring water is higher than that in the atmosphere and CO_2 outgases from the water.
    根据研究，钙华的形成是由于泉水中的CO2分压高于周围空气的CO2分压，CO2从水中逸出，因而导致碳酸钙发生过饱和并产生沉淀的结果。
14. The formation of tufa in huanglong, Sichuan
    四川黄龙钙华的形成
15. Age Measurement and Significance of Calcareous Tufa of Lunan Stone Forest, Yunnan, Chian
    中国路南石林地区钙华年代测定及其意义
16. A special tufa fabric-stratified-algae-support fabric and the cause of its formation
    一种特殊的石灰华组构&层状藻支架组构及其成因
17. Bio-effect on Tufa Deposition
    钙华沉积的生物效应
18. Tufa is a good carrier which records the information of palaeoclimate-environment, and has the unique superiority: ( 1) The resolution is high, may achieve the resolution of season or month.
    钙华是记录古气候环境信息的良好载体，并有独特的优势：①分辨率高，可达到季-月的高分辨率。
19. A STUDY ON BIOGENETIC OF CALCAREOUS TUFA& Examplified by the tufa in Jiuzhaigou, Sichuan, and Huangguoshu, Guizhou
    石灰华的生物成因研究&以四川九寨沟和贵州黄果树等地石灰华为例
20. Fossil plants from calcareous tufa and palaeoenvironments in ruoqiang, Xinjiang
    新疆若羌石灰华中的植物化石及古环境

noun

1. hard volcanic rock composed of compacted volcanic ash

   Synonym:    tuff

2. a soft porous rock consisting of calcium carbonate deposited from springs rich in lime

   Synonym:    calc-tufa