Monday, May 22, 2017

Can bad fashion save the icecaps?

With rapid melting in the Arctic, and potential glacial instability in Antarctica. the planet’s present cryosphere is in a spot of bother. The root cause of this is warming from the heat trapped by greenhouse gasses, mostly CO2. But while many suggestions have been made for reducing CO2 output, as yet there are relatively few mothods for capturing those emissions which are still occurring. And with international agreements lacking enforcement mechanisms, a new push for Coal in the US, and decades of record rates of emissions growths, humanity clearly needs someone to police the worlds emissions. And we don’t need any old police. We need fashion police.

Although many proposals have been made for finding ways to prevent our hunger for fossil fuels from ruining the atmosphere, not nearly enough of these strategies have included the use of tacky clothing. And yet, the potential for horrific fashion statements to save the world should not be underestimated. The reason for this is that ultimately, the easiest way to scrub carbon dioxide from the atmosphere is to react it with an alkali or alkali earth oxide, thereby forming a carbonate  mineral. While silicate weathering will do this naturally over a 50-100kA timescale, we can’t really afford to wait that long. Roasting carbonates obviously won’t accomplish anything, since that simply makes the alkali oxides available by releasing CO2. However, there are alternatives.

One way to generate an effective carbon dioxide scrubber is to split salt (from ocean water) into its component sodium and chlorine. The sodium will rapidly (on a geologic timescale) oxidize, hydrate, and carbonate, forming NaHCO3. This should be reasonably effective, so long as we can sequester the chlorine that is produced as a byproduct. And here is where the tacky clothes come in. During the latter part of the 20th century, outrageous costumes were constructed out of the polymer polyvinyl chloride. If we can simply manufacture enough disco pats, fake leather jackets, and not-so-Sunday dresses, that will sequester the chlorine from salt electrolysis in the world’s wardrobes, so that the sodium can be used for atmospheric CO2 drawdown.

Doing a bit of math here, with annual emissions of about 29 billion tons of CO2, we will need about 15 billion tons of Na to scrub our emissions. This requires approximately 55 billion tons of PVC to store the chlorine left over from the salt decomposition (powering the electrolysis is left as an exercise for the reader). Luckily, due to the large world population, this works out to only about 8 tons of PVC per person per year, or about 21 kg of PVC per day.

None of the PVC outfits I can find for sale on the internet at this hour appear to contain 21 kg of material. They are generally a little bit flimsier than that. And even with a new steampunk, burlesque, gothic, and disco outfit every day for every man, woman, and child on Earth, we are still looking to be short by a factor of 50. Buying 21 kg of new PVC outfits a day would necessitate a costume change every 7 minutes. Luckily, there are other things which PVC can be made into.

For example, the credit cards used to purchase PVC outfits by people too brazen to stoop to cash are made of PVC. And while they only weigh a few grams each, most people do have a few. Similarly, the music to which PVC clad people traditionally dance comes from an archaic form of grooved PVC platter known as a “record”. Buying 140 LP records a day will put all of the world’s citizens at their PVC quota without having to wear anything at all.

So fear not, reader. There is hope. with enough old time music and garish clothing, anything is possible.

Tuesday, May 09, 2017

Geosonnet 50

When protolith components decompose
Some isolated grains are left behind
Hydration takes their comrades, spinel knows
Not why it’s been preserved. So can its mind
Be trusted to reveal the deepest Earth
The mantle which exists beneath the crust?
Survivor guilt clouds memories of birth
In which trace elements must earn our trust.
The Tonga Trench serpentinites preserve
Hydration from minimal to complete
Survivor mantle phases there conserve
The elements closed min’rals don’t excrete.
   As long as these survivors can be found
   They will remember stories to expound.

Other geosonnets: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

Saturday, April 29, 2017

Geosonnet 49

From gutters, one can’t always see the stars
The fog, the rain, life’s tedium can shade
So should the stardust gravitate to Earth
It could collect wherever dreams may fade.
But like the needle, tightly stacked with hay
These grains of hope are difficult to find
Accumulate detritus, day to day
Our eye for stellar hope goes dim, then blind
But careful observation does reveal
That space dust is detectable in town
The sampled gutters no longer conceal
That which from asteroids to Earth came down.
   Thus steadfast pessimists must now beware
   That specks of heaven settle everywhere.

Other geosonnets: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

Wednesday, March 22, 2017

Routine science turns clever- laser ICP vs SHRIMP analysis of Archean detrital zircons

So, last year I published a Geology paper. It is summarized in Geosonnet 42; see link therein to the paper itself. As it turns out, the paper deals with Archean uranium mobilization and the sedimentary history of carbonado diamond. But what the paper doesn’t say is that I wasn’t actually trying to do that. More professional researchers than I might know how state in their articles that it was all just a lucky coincidence, but I don’t know how to squeeze that into a short format journal.

What actually happened is that the second author and I realized that we had different pieces of the puzzle which, with the help of some old Japanese data, could be pieced together for a coherent story. So hey, "write it up."  Most of my part of the puzzle was unpublished bits and pieces from my PhD and post doc 15+ years ago, but the SHRIMP data was actually less than a year old, as I had collected it for an entirely different reason.

Back when I was working at ASI, which had just bought the Resolution laser ablation line from Resonetics, a few of us started looking at how the SHRIMP and laser products could best compliment each other. One of the things we experimented with was controlling the SHRIMP with a version of the laser control software. Another thing we wanted to know was whether there was any advantage to using the SHRIMP for detrital zircon provenance studies, so I pulled out my old PhD zircons, remounted them with modern standards, and we programmed a customized version of GEOSTAR to automatically rerun the same zircons (if they hadn’t been blown up) to compare the results. Of course, the laser data was old, and the SHRIMP was trying to make analyses next to laser holes (which distort the extraction field, due to the unfortunate tendency of holes not to be flat), but it generally worked, and the data is tucked away deep in the supplementary section of the paper.

Since there are analytical geochemists who occasionally read this blog, but might not think to look for microbeam comparisons in the appendix of a diamond radiation defect luminescence paper, I thought I’d mention it, and put up some plots that got culled due to space requirements.

The short answer is that fully metamict zircons (like half of the Tombador grains) are open system with either technique, but for zircons that are only a little bit metamict (most of the Jacobina zircons), the smaller ion probe spot and better 204Pb backgrounds improve data quality. Anyone who is interested is welcome to download the Data Repository data (it’s all there) and ask.

Figure 1 (See data repository for full version): Tombador zircon analyses with SHRIMP (red) and laser ICPMS (yellow). The SHRIMP data are, in general, a little more concordant, but there isn’t much in it.

Figure 2 (See data repository for full version): Jacobina zircon analyses with SHRIMP (red) and laser ICPMS (yellow). For this sample, the SHRIMP data are substantially more concordant.

Figure 3:  Probability distribution curves for Tombador zircons analysed by SHRIMP (purple) and laser (Red).

Figure 4:  Probability distribution curves for Jacobina zircons analysed by SHRIMP (tan) and laser (Red). Note that laser peaks are generally broader and offset to younger ages due to Phanerozoic Pb loss.

Tuesday, March 07, 2017

Geosonnet 48

The garden in which life evolved from slime
Did not have apples, naked girls, delights.
Although the details have been lost to time
clay seems more likely, or serpentinites.
Hydrated mantle min’rals do not tempt
But their kinetics none-the-less intrigue
Relationship twixt rock and sea attempts
at understanding help if we know speed.
The magnetite which serpentine expels
Contains trace actinides which will decay.
The helium which in the crystal dwells
Gives cooling time and late stage growth away.
Three million years ago, when Lucy ran
The final Greek tectonic stretch began.

Other geosonnets: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48