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改造华盛顿的古岛

The Ancient Island That Transformed Washington: A SciShow Field Trip

Thanks to Subaru for partnering with us
感谢斯巴鲁在《科学秀》
on the SciShow Mini series.
迷你系列节目中与我们合作
The all-new 2020 Subaru Outback
全新2020款斯巴鲁傲虎
helped us stay comfortable during filming.
让我们在拍摄过程中保持舒适
Welcome back!
欢迎回来!
We’re in the middle of a three-part series——
我们正在拍摄三部曲的中间部分
exploring the geology of Olympic National Park.
探索奥林匹克国家公园地质
Last week, we talked about the Mt. Olympus,
上周 我们讲述了奥林匹斯山
the tallest mountain on Washington’s Olympic Peninsula.
它是华盛顿奥林匹克半岛最高的山
But now, let’s switch gears and talk about what happens to be
今天 我们换个话题
one of my favorite stories around here.
说一个关于此地我最喜欢的故事
the story of an ancient island called Siletzia.
故事讲的是一个叫Siletzia的古岛
Alright, let’s go!
那么我们出发吧!
Alright.
好的
So, here’s a question for you.
有个问题想问大家
There are no volcanoes on the Olympic Peninsula, but there is a ton of basalt
奥林匹克半岛没有火山 却有大量的玄武岩
which is a type of volcanic rock.
玄武岩是火山岩的一种
So, how did it get here?
那么 这些玄武石是怎么到这里的呢?
Well, it wasn’t the Cascades off to the east.
它并不能和瀑布一样向东流动
Instead, scientists believe it got there
但科学家相信那里有玄武岩
because 50 million years ago,
是因为五千万年前
a volcanic island called Siletzia
一个叫Siletzia的火山岛
collided with North America.
与北美板块相撞
The story goes like this,
故事是这样的
More than 50 million years ago, in the northeast Pacific Ocean,
五千万多万年前 在太平洋的东北部
an island made primarily of volcanic rock appeared.
形成了一个主要由火山岩构成的岛
Today, geologists call it Siletzia.
如今 地质学家称它为Siletzia
Siletzia was attached to an oceanic tectonic plate.
Siletzia附属于海洋构造板块
And over time, that plate moved as they tend to do.
随着时间推移 板块逐渐移动
Specifically, this one went east
具体而言 这个板块往东移动
and was slowly traveling under neath the North American tectonic plate
并缓缓滑入北美板块的下方
Or subducting, if you watched our Mt. Olympus episode.
或说是俯冲 如果你看了奥林匹斯山那集视频
As the tectonic plate moved, Siletzia moved along with it.
Siletzia会跟着地壳板块一起移动
And eventually, about 50 million years ago,
最终 5千万年前
Siletzia ran up against North America.
Siletzia与北美板块相撞
In other scenarios,this might have actually been the end of the story.
一般来说 故事应该到此为止了
Siletzia might have just disappeared under the North American plate,
Siletzia岛可能消失在北美板块的下方
melted and never been heard from again.
从此踪迹全无 再未听说
Which happens.
就是这样
But recent studies suggest that
但最近的研究显示
Siletzia was too hot and buoyant for it to subduct.
由于Siletzia岛的温度太高 浮力太大 不能下沉
So instead, it accreted onto North America
于是Siletzia岛与北美板块融合到了一起
meaning that it got stuck to the side of the tectonic plate
意思是它嵌入北美板块一侧
and eventually spread throughout the landscape.
最终遍及这一地区
That’s why the Olympic Peninsula
这就是为什么奥林匹克半岛
and the Pacific Northwest have a bunch of volcanic basalt
和太平洋东北部会有那么多火山岩
Not because of a bunch of volcanoes,
不是因为存在大量火山
but because of an ancient, traveling, volcanic island
而是因为有移动的火山岛
Geologists founded most of this out by studying the rocks in this area
地质学家得出上述结论是通过研究这里的岩石
as well as using models like one published in 2014
并利用模型 如2014年发表的那个
that used a bunch of data from rocks in Washington and Oregon.
该模型利用来自华盛顿和俄勒冈州的岩石的大量数据
And you can see evidence of this all over the place
到处都可以看到这样的证据
The Siletzia basalt stretches from Oregon to British Columbia,
Siletzia的玄武岩从俄勒冈州延伸到哥伦比亚
and it varies from 10 to 32 kilometers thick.
厚度10到32公里不等
If you know what to look for and have a good map,
如果你知道要找什么 而且有一份不错的地图
you can see it for yourself on certain hiking trails
你可以在某些徒步线路中
or other rock outcroppings around here.
或根据周边其他裸露的岩石亲自发现它
So this is all so really cool,
这些真的很酷
especially if you know the story behind what you’re looking at.
尤其是在了解其背后的故事后
But there’s one question we still haven’t answered:
但仍然有一个问题我们还没有解决
Where did Siletzia come from?
Siletzia岛从哪里来的?
How did that island get there in the first place?
那座岛最初是怎样到达这里的?
Alexis:Stefan,I am very glad you asked!
Stefan 很开心你能提出这个问题
Because that is one of my favorite parts of this story
因为那是这个故事中我最喜欢的一部分
Okay, so tectonic plates are moving all the time,
地壳板块一直在移动
Which means that 50 million years ago
也就是说 五千万年前
the North American plate and the oceanic plate that containes Siletzia
北美板块和包含Siletzia的大洋板块
weren’t on the same place on the globe as they are today.
与今天所在位置不同
They were actually much farther east.
它们当时更靠东方
okay.
好的
So, as the hypothesis goes,
因此 按照这个假设
50 million years ago
五千万年前
off the west coast of what’s now Washington was the Yellowstone hotspot.
当时黄石热区靠近西海岸 现如今那里是华盛顿
Wait,so Yellowstone is in”Yellowstone National Park?”
等等 是黄石国家公园里的黄石热区?
like no where near Washington!
在离华盛顿很近的地方?
Yes! 50 million years ago,
是的 五千万年前
the same hotspot that powers all of the cool thermal features at Yellowstone National Park
黄石国家公园里给所有温泉提供热量的同一个热区
was most likely located under the eastern Pacific Ocean.
当时极有可能位于东太平洋海底
And over time, it released a bunch of volcanic material
随着时间推移 它释放出大量的火山物质
that became the Siletzia basalt.
变成了Siletzia的玄武岩
That is wild
那是有争议的
Admittedly, this is somewhat up for debate
不可否认 这在某种程度上的确有争议
because it’s really hard to prove, and there are other hypothesis.
因为这很难去证明 因此出现了很多其他假说
But there’s a lot of good evidence for this.
但也有很多确凿的证据
And honestly, it’s just mind-blowing to think about.
的确 这想想都让人兴奋
So, the story of Siletzia is super cool,
Siletzia的故事超级酷
because if you didn’t know the story behind it,
如果你不了解这背后的故事
you could just be looking at out the basalt not think twice about it.
你可能只会观察玄武岩而不会想太多
But if you do know this story,it’s seriously amazing.
但如果你了解这个故事 那就会很精彩
And there are more stories like that out here too,
这儿还有其他类似这样的故事
So,before we head home,let’s make one more stop.
那么在我们回家之前 再走一段吧
So before we wrap up,
在结束之前
we’d like to give a huge thank you to Subaru
我们衷心地感谢斯巴鲁
for making this road trip adventure possible
为此次路程探险提供赞助
When we filmed this series, it was early January,
我们在拍摄这段影片时是一月初
and we got a chance to take advantage of the Outback’s all-wheel drive,
我们很荣幸能体验这辆傲虎的四轮驱动
ground clearance, and — of course — the heated seats.
离地高度和加热座椅
So thankful for thoes heated seats.
非常感谢加热座椅
Seriously. After a cold day of filming,
说真的 经过一整天低温的拍摄
it was very nice to get into a warm car.
能进到温暖的车 真的很不错
So, If you wanna find out more more about the 2020 Subaru Outback,
如果你了解找更多关于2020 斯巴鲁傲虎的信息
you can check out the link in the description.
你可以点击描述栏的链接

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视频概述

讲述Siletzia古岛从5000万年前至今的故事。一个本没有火山的古岛是怎样通过地质活动产生火山岩的呢?它是怎样漂洋过海来到华盛顿的呢?跟我一起来看看这个奇怪的岛吧!

听录译者

收集自网络

翻译译者

素素

审核员

审核员HJ

视频来源

https://www.youtube.com/watch?v=8k7u_tn9C0c

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