lower mantle

下地幔:地球内部的一层
常用释义
下地幔:地球内部的一层,约占地球总体积的56%,位于地球表以下660至2900公里的区域。下地幔的压力和温度范围广泛,主要成分包括镁橄榄石、铁方镁石和硅酸钙钙钛矿。下地幔的研究对于了解地球内部结构和地球动力学过程至关重要。

例句

1·This paper deals with the advance in study of the composition, geochemistry and deep seated fluids of lower mantle.

主要论述深部地幔的组成、地球化学及深部流体研究的进展。

2·Like the CORE of earth, the mantle can also be divided into two concentric layers, the lower mantle and the upper mantle.

就像地球的核部一样。地幔也可分为两个同心圆圈层,下地幔和上地幔。

3·The east China continent located over the heat source of the lower mantle was uplifted, broken and drifted toward the ocean.

位于下地幔源热区之上的中国东部大陆,发生隆起、破裂、向洋漂移。

4·This won't affect climate tomorrow, but what our results tell you is that carbon from the surface can go all the way into the lower mantle, which may be a long-term sink for carbon.

这不会对明天的天气产生影响,但我们所得的结果告诉你来自地表的碳元素总是能够进入到底层的地幔中,这可能是碳元素的长期下沉过程。

5·The Moon's mean density is much lower than that of Earth but is about the same as that of Earth's mantle.

月球的平均密度比地球低得多,但与地球的地幔密度大致相同。

6·Hess suggested that the presence of water, probably released from minerals decomposing in the Earth's mantle, might have meant that a high-magnesium magma could have existed at a lower temperature.

赫斯认为,水的存在可能是由地幔中分解的矿物质释放出来的,这可能意味着含镁高的岩浆可能在较低的温度下存在。

7·Leucite tephrite was derived from the more enriched mantle source with lower degree of partial melting of mantle source than alkaline olivine basalt.

相对于碱性橄榄玄武岩,白榴石碱玄岩来自于更加富集的地幔源区,其地幔的部分熔融程度相对较低。

8·It is a porphyry copper-silver-tin deposit that occurs in the transitional crust and was formed by derivatives of the lower crustal-upper mantle transitional magma.

它是分布于过渡性地壳上的、由起源于下地壳—上地幔的过渡性岩浆的衍生物形成的斑岩型铜银锡矿床。

9·The deeply studies show the GD intrusions was mixed by magmas from mantle and from lower crust, without the effect of subduction system.

综合地球化学证据表明岩浆起源不受古俯冲体系的影响,而是幔源岩浆与榴辉岩相镁铁质岩石部分熔融岩浆混和的产物。

10·It is tentatively suggested that the lower lithosphere MORB-OIB mantle is recently accreted since the paleo-lithosphere mantle was replaced by the abnormal asthenosphere.

我们初步认为,该区深部岩石圈MORB - OIB地幔可能是软流圈置换古岩石圈地幔而增生形成的。