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tufa n.【地質學;地理學】華;石灰華,泉華。adj.-ceo...

tuff

Xiongcun copper - gold ore deposit is located in gangdese metallogenetic belt with a large scale . the ore body mainly exists in the second lithoid unit ' s tuffs and the third lithoid unit ' s dacite tufa of the cretaceous volcanic stratum , which are not only mother rock but also mineralized body 雄村銅金礦床處于岡底斯成礦帶,礦床規模巨大,礦體主要賦存于白堊系火山巖地層第二巖性單元的黃鐵絹英巖化硅化凝灰巖和第三巖性單元英安質疑灰巖中,上述巖石既是賦礦圍巖又是礦化體。

A detailed comparison from both textual and technical angles shows that the rigui tufa ( the drawings and methods of sundials ) by didace de pantoja and sun yuanhua contains basically the same content as both the first part of lu zhongyu ' s manuscript on sundials and johann adam schall von bell ' s and zhu que ' s book with the same title , which in turn are both arguably written by pantoja and sun 摘要文本和技術兩方面的細致比較表明,龐迪我和孫元化的《日晷圖法》與陸仲玉日晷著作抄本的第一部分以及湯若望和朱確的同名著作內容基本相同,可以認為它們均出自龐迪我和孫元化的手筆。

The author presume the original physiognomy of jiuzhai valley , and acknowledged changhai valley was a surface - water with uniform waterpower , the rize valley was a branch of it but the inequality rise of lithosphere , the deposit of earthquake landslides debris flows and falling or glacier blocked the river - way , furthermore , the flow water with high content of ca ( hco3 ) 2 , so tufa dyke formed and evolvement the present dyke of lakes the present physiognomy formed on the base of those 2 由于地震、滑坡、泥石流引起的堆積物和冰川作用形成的冰磧物堵塞河道,再加上構造運動造成地殼的不均勻抬升,九寨溝的這種獨特的地質環境以及高含ca ( hco _ 3 ) _ 2的巖溶水流作用下,為caco _ 3沉積創造條件,沉積的caco _ 3加高、連接最終形成灰華堤壩,使湖泊的形成成為可能。

But the camera focuses on a handful of the 30 , 000 troops that landed on the inhospitable spec of volcanic ash and tufa that is iwo jima on feb . 19 , 1945 , to dislodge some 20 , 000 well - fortified japanese 但是影片的鏡頭對準了一批為了驅逐20 , 000人,火力強大的日本部隊而降落在火山灰和泉華地區的30 , 000人的部隊,那是19 , 1945年2月的硫磺島。

Mono lake ' s tufa are particularly dramatic because water diversions have significantly lowered the lake ' s level , exposing more of the columns 莫諾湖之所以會出現如此獨特的景致,是因為分洪使得湖水水位降低,從而露出了更多的石柱。

Tufa form when underwater springs rich in calcium meet lake water rich in carbonates , forming calcium carbonate , or limestone 由于地下水富含鈣,而湖水又富含碳酸鹽,于是兩者接觸便產生出碳酸鈣,即石灰石。

Spires of limestone tufa rise from the shores of california ' s mono lake 在加州莫諾湖邊,聳立著一座座石塔。

Discussion on engineering characteristics of tufa in kaili perfecture 凱里地區石灰華的工程特性探討