热源在地球的中心-地球科学堆栈交换江南电子竞技平台江南体育网页版

热源在地球的中心

2021 - 05 - 05 - t13:22:24z

如果我读的大部分评论和文章在互联网上给热火的两个主要原因在我们地球的深处发现: < ul > <李>超高压力中心的放射性衰变< /李> <李> < /李> < / ul > 我需要澄清在这两点上。 < >强压力< / >强:虽然很清楚为什么在气体压力和温度绑定(*)这是不清楚当物质在固体或液体阶段。<强>为什么推固体会导致其热骚动提高?< / >强在我看来理所当然的大多数人这样的点没有适当的分析当然涉及到物理比地球科学。 < >强放射性< /强>:如果我把一起通过放射性衰变放射性物质会产生热量。这很好。不过我的假设是,如果我把100公斤的任何物质在地球表面应该包含相同的100公斤的同一物质的放射性同位素的比例来自地球的中心。如果情况不是这样,那么我问我自己<强>为什么我们有更高比例的放射性同位素地球的中心,而不是在它的表面?< / >强我听说不稳定同位素重,这就解释了为什么他们积累了地球的中心,只是由重力;但通常放射性同位素刚刚几个中子(或者更少),这使元素比仅重2或3元素周期表的旁边。例如碳14比氧气更轻。 <强>谁能澄清如果这两个点是有效的或不是,为什么?< /强> (*):即使与体积和质量不变我想说你可以增加压力通过增加温度,而不像你不能反过来增加压力约束下的质量和体积常数

答案由user22279热源在地球的中心

2021 - 05 - 05 - t16:59:59z

"Why pushing on a solid mass would cause its thermal agitation to raise?"

It doesn't.: Earth's interior heat ratio between pressure and atomic decay

"why we have higher percentage of radioactive isotopes in the center of Earth rather than in its surface?"

We don't know how exactly radioactive isotopes are distributed in the earth. Radiogenic heat in the core may be insignificant, also because the elements responsible for radiogenic heat are found rather in the Earth's bulk (mantle and eve more so crust) than in the core (Lithophile elements). The core is mainly kept hot by primordial heat, sotosay left over heat from the release of gravitational energy during accretion and differentiation, tidal heating may also have a small part in it. What is the total Earth's interior energy budget?

Mantle and crust store the most of earth's heat and host most of the radioactive isotopes that generate heat, specifically the crust. There's also this reasonable looking Wikipedia article.

回答大卫Hammen热源在地球的中心

2021 - 05 - 06 - t05:09:08z

地球物理学家和地球化学家在一些问题上达成一致,但别人同意不同意。 ,他们也同意大部分的热能在地球的核心是原始的。大量的碰撞而产生的热量的大量对象,共同形成了地球。时更多的热量导致地球早期分化成iron-heavy核心和silicon-heavy地幔和地壳。形成固体内核的另一个地球物理学家和地球化学家认为热源。 ,他们同意各自保留不同意见是,地球物理学家希望大热通量在地幔边界,以解释地球磁场的存在(地球与金星和火星,没有持久的偶极磁场)。没有可行的来源如此大热通量眼中的地球化学家。放射性衰变被推测为热量的来源。 这种猜想的问题似乎是四长寿同位素化学与陷入核心不相容。这是反过来的。 They rise to the surface. Those four isotopes are isotopes of three elements, uranium, thorium, and potassium, each of which is chemically active and each of which is an incompatible element. This makes these elements more concentrated in the Earth's crust than in the mantle, and more concentrated in the mantle than in the core. The one exception might be potassium. Some studies show that potassium might change from a lithophile ("rock loving") incompatible element to a sidereophile ("iron loving") element at high temperature and pressure. Other studies don't show this. So once again, we're at the agree to disagree stage.

The agree to disagree stage is what makes science "science".

答案由Gimelist热源在地球的中心

2021 - 05 - 07 - t08:21:27z

< blockquote > 地球深处的 < /引用> 有多深?"Deep" is a relative thing. You can have 10 kilometres deep, or 5000 kilometres deep.

Super high pressure at the center of it

It's not the pressure per se that's causing the heat, it was the process of getting to the pressure when the Earth's formed. Compression creates heat. That's easy to know - just touch a bicycle air pump after filling up. There's also the issue of gravitational potential energy converting into heat once Earth was accreted. The the pressure and heat are together the result of Earth's formation. It's not that pressure itself makes the heat.

Radioactive decay

According to what we know, the three modern heat producing elements (thorium, uranium and potassium) are actually concentrated in the mantle, with an even greater concentration in the crust, which is just the top few kilometres. It's still deep for us humans, but extremely shallow when compared to the core. There is still some debate on this (see the two other answers), but my own personal opinion is that it's safe to say there's very little U Th and K in the core.

Also read my very relevant answer on the World Building website:

https://worldbuilding.stackexchange.com/a/123951/39999