编辑-地球科学江南体育网页版堆栈交换江南电子竞技平台

你不是登录。你的编辑将被放置在一个队列,直到同行评议。

我们欢迎编辑,使读者更容易理解和更有价值。因为社区成员审查编辑,请尽量使文章更好比你怎么发现,例如,通过修正语法或添加额外的资源和超链接。

牧师

海洋盐度不是一个好的天文钟是为什么呢?

1910年,乔治·贝克发表地球的年龄,他利用海洋中钠堆积速率估计地球的年龄50至7000万年。通过各种方法,现在我们知道地球是大得多,而据我所知没有多少兴趣的科学家使用海洋盐度作为年龄自贝克尔指示器。

一个最近的一篇论文,“海失踪盐”(PDF),声称6200万年之后的最高年龄达钠输入和输出。我发现几个声称,在互联网上盛传的测量误差,但是找不到任何坚实的引用。我找到一个参考“钠循环和海洋”的年龄,但它是收费,我不能读它。

为什么这个盐天文钟不同意其他测定方法?出现了什么问题,在从海洋盐度计算地球的年龄吗?

回答

一个好的天文钟是一个满足下列条件:1。我们可以确切地知道它的东西当它开始2。我们知道的积累的速度,速度是常数。例如,锆石U-Pb约会是一个优秀的天文钟。我们确切地知道有多少Pb在锆石(=没有),我们知道明朗化了Pb的速度积累放射性衰变的U(有两个单独的同位素,没有一个!喜乐!)另一方面,海洋中钠是一种可怕的天文钟。首先,我们没有完全理解当海洋是如何形成的,更不用说他们中包含多少钠开始。与铅的锆石始于0和上升,海洋中钠的含量是一个包含多个变量的函数。这些变量随时间变化。 How much sodium do rivers input into the ocean? Depends. During orogenic periods quite a lot. During other periods less than a lot. Volcanic eruptions? Periods such as the Siberian or Deccan traps surely input a lot, but what about other periods? Removal of sodium is also non a constant process. As bon said in the comments, you have mass removal events such as the Messinian crisis. Sodium lost in ocean floor alteration is a function of how much seafloor spreading you have at that time, and the rest of the ocean chemistry. All this changes throughout geological time. The rate is not constant! The paper that you linked to from the Institute for Creation Research has a long list of inputs and outputs of sodium and attempts to quantify it. First of all, I would be skeptical of anything coming out of there, because religiously motivated people tend to cherry-pick the data that fits their belief. But ignore that, even if their data is 100% correct, it is still correct for today. For now. As mentioned before, the input and output fluxes change drastically over time. It is impossible to assume a constant rate for that! Quoting from that paper: > It is God’s world that we are studying by scientific methods. It is God’s handiwork that we are learning about through those studies. God deserves to be praised and honoured—and believed—for what we have been able to learn about his world. If our careful study of God’s world brings us false or unreliable information, then what can it mean for the Psalmist to sing, “The heavens are telling the glory of God; the skies proclaim the work of his hands.”? Other than the fact that this passage does not belong in a scientific paper, it mentions the scientific method. Well, they fail at the scientific method because they make assumptions that make their entire study invalid. ---------- **2019 EDIT** A [new open access paper][1] shows that quite a lot of chlorine ends up in subduction zones, and removed from the oceans. As there are different subduction fluxes throughout geological time, this is another reason for salinity being a bad chronometer. [1]: https://doi.org/10.1038/s41467-018-07955-8

编辑总结

取消

添加一个评论 |

正确的小错误或错误
澄清的意思,而不更改它
添加相关资源或链接
总是尊重作者的意图
不使用编辑与作者回复

创建代码用引号”或式子~篱笆
' ' '
像这样
' ' '
添加语言标识符来突出显示的代码
”“python
def函数(foo):
打印(foo)
' ' '
把段落之间的回报
在结束linebreak添加2个空间
_italic_或* *的* *
报价将>开始的
做链接(尽量使用https)
< https://example.com >
(例子)(https://example.com)
< a href = " https://example.com " > < / >示例
MathJax方程罪\ \ ^ 2θ美元

格式帮助»
回答帮助»

MathJax帮助»