老化的地殼 的英文怎麼說
中文拼音 [lǎohuàdedeké]
老化的地殼
英文
aging crust-
During the yanshanian phrase, the area is in the condition of contractional background, with multi - staged tectonic reversion. 5. through studying the origin of volcanic rocks and the characteristics of magma evolution, it concludes that there exist 3 originated areas of magma - from mantle, crust, and mantle - crust exchange. the basic magma of nandaling volcanic rocks of early jurassic is derived from upper mantle ; the magma of tiaojishan volcanic rocks of mid jurassic is formed in the contractional tectonic setting, and derived from the transition zone of crust and mantle interaction ; the acid magma of l
5 、通過巖石化學、微量元素、稀土元素的研究，探討了不同級別節律的火山巖成因、巖漿演化等特徵，認為本區燕山期火山巖有三個巖漿源區，即地幔源、地殼源和殼幔混源，早侏羅世的南大嶺旋迴的基性巖漿，起源於上地幔；中侏羅世髫髻山旋迴火山巖是在相對擠壓環境中，巖漿起源於殼幔過渡帶；晚侏羅世無負eu異常的酸性巖漿來源於下地殼的古老結晶基底的局部熔融，有負eu異常的酸性巖漿來源於上地殼的局部熔融；早白堊世火山巖基性巖漿起源於上地幔，中性巖漿起源於下地殼底部的殼幔過渡帶。Ground - up shells of marine organisms mixed with pebbles, clay and eroded rock, deposited there over many millennia, now form a bed of muddy paste that is so soft and well lubricated that the ice streams can glide along even more easily than earlier researchers expected
有科學家將積冰融化出一公里長的窄洞，採集古老海床的樣本，結果發現地底混雜了海洋生物殼體、礫石、黏土與風化巖，幾千年下來形成又軟又滑的泥床，使冰流較先前研究人員預期的更容易滑動。
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