JR junior's blog

Going to the Moho

The JOIDES Resolution has left the Superfast hole and come back to port and this expedition is just about finished. While drilling, we went deep into the ocean floor, and got that much closer to the Moho, the boundary between the mantle and the crust.

Quest for Zircons

When the Superfast science party ages the rocks in the cores from this expedition, they will do so with zircons. Zircon sounds like the name of an evil Martian tyrant in a 1950’s science fiction movie, but it is actually a mineral that can form within an igneous rock when magma first cools into rock.

So How Do Scientists Figure Out How Old Rocks Are?

To figure out the spreading rates of various places in the seafloor, scientists compare the ages of rock samples taken from those places. It is not easy to figure out how old a rock is. They do not have growth rings like a tree nor do they have bruises caused by their aunt Barbara pinching them to grow an inch every time they have a birthday.

How Basalt and Gabbro are Both the Same Yet Different

As the JOIDES Resolution has continued to drill deeper into the hole beneath us, the type of rock we are drilling has changed. Near the surface of the ocean crust you find mainly basalts. As we get closer to the bottom of the ocean crust you find mainly gabbros.

Meet Structural Geologist Jeremy Deans

Jeremy Deans is a structural geologist who is on board the JOIDES Resolution right now as part of the Superfast expedition science party. To find out why he rules, read on.

How to Make an Ocean in Just Four-and-a-Half Months

Last time, I explained that one reason the crust we are drilling in is called “superfast” is because, at a spreading rate of 20 cm a year, it spread much quicker than most seafloors spread. Still, it probably sounds weird to call something superfast that every snail on Earth can outrun.

How Fast is Superfast?

The seafloor we are drilling right now formed at a superfast rate, even though it would seem superslow to us. To find out how something that seems to be superslow can be superfast, read on.

If the Seafloor is Spreading, Then Why Doesn’t it Take Over the World?

In all the movies titled The Blob, the Blob continues to grow and spread, covering more and more area, like it might to cover the entire world, which sounds kind of like seafloor spreading.

Seafloors Surfing the Asthenosphere (or, What is Seafloor Spreading, Anyways?)

The seafloor is spreading! The seafloor is spreading! To find out what this means, read on.

To Boldly Go Where Three Other Expeditions Have Gone Before

The JOIDES Resolution is currently drilling in a hole that has already been drilled during three previous expeditions.
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