Elements Covers

Editorials

Does Earth Still Offer Discoveries?

Imagine a geoscientist who begins his career as a mine surveyor but who quickly realizes that this was too small a field for him. So, he decides to take field trips, which last many years, to remote parts of the Earth. What our geoscientist discovers includes nothing less than the interactions between topography and climate, the alignment of volcanoes along zones of earthquake activity and at great depth, and three-quarters of all known plant species. Returning home, our geoscientist does not rest. Instead, he lets the world know of his spectacular discoveries. He becomes a prolific writer who publishes an immense number of articles and books, all the while discussing the implications of his findings in a dozen or more detailed letters a day with colleagues around the world.

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Mineralogical Revelations From Space Odysseys

Sir Arthur C. Clarke (1917–2008), perhaps best known for the 1968 book and film 2001: A Space Odyssey, once stated that “The only way of discovering the limits of the possible is to venture a little way past them into the impossible.” As you enjoy this issue of Elements on planet Mercury, think about the remarkable achievement of sending a spacecraft to Mercury, the closest planet to the Sun.

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The Irony of Iron — Life’s Major Trace Element

All organisms, from lowly microbes to higher forms of life (including humans), need iron. Yet there is irony to iron. Despite being the second most abundant element in the Earth, it is not readily available for consumption. Earth owes this irony to the combined effects of geodynamics and biology. The early segregation of iron into the Earth’s core relegated iron to “only” the fourth most abundant element in the crust. About 2.3 billion years ago, a complex interplay between photosynthesis and redox changes in Earth’s mantle allowed the buildup of free atmospheric oxygen. Today, there is a sufficient supply of photosynthetic oxygen to convert all iron at the Earth’s surface and in its surface waters, including seawater, into its ferric [Fe(III)] form. This ferric form is barely soluble, making it hard to access by organisms. Ironically, life itself made iron a ‘trace element’.

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The “Plasticene” Epoch?

This issue of Elements explores the fascinating realm of deep-ocean deposits that have the potential to provide society with many of the raw mineral resources required to meet the world’s growing needs. While raw materials have always, and always will, play a critical role in meeting these demands, materials made by humans have also become increasingly important, expanding in concert along with the world’s population, industry, and resource use. Most notably, plastics, which are synthetic organic polymers derived from fossil hydrocarbons, have become an indispensable part of our material world because of their remarkable number of uses and versatility. Plastic bottles, bags, credit cards, scotch tape, pipes, toys, to name a few, form part of our everyday life. Not surprisingly, the global production of plastic has increased from 2 metric tons (Mt) in 1950 to 380 Mt in 2015 (Geyer et al. 2017). By 2050, Geyer et al. (2017) estimate that roughly 12,000 Mt of plastic waste will be in the natural environment. This is a staggering amount, enough to cover the entire surface of the Earth in a thin layer of plastic! With the growing abundance of plastic, the potential for preservation in the rock record increases. What impact will synthetic materials like plastic have on future deposits in the Earth – will there be a “Plasticene Epoch”?

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Ethically Sourced Metals

The Central Andes is a land of llamas, salt flats and majestic volcanic peaks. It is one of most remote places on Earth and arguably the driest. In a not unconnected way, the Central Andes is also home to the world’s largest copper mines. The unique combination of magmas, tectonics and climate, described in this issue of Elements, has conspired to create hydrothermal ore deposits that provide a third of the world’s copper and a quarter of its molybdenum.

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The Making of Great Wine

As we set up the publication schedule for each year, the principal editors of Elements try to ensure that the journal maintains enough diversity to hold the interest of you, our readers. In this context, we sometimes accept proposals for issues on very well-known mainstream subjects (such as layered intrusions) which we think can usefully be updated and summarised at a good level. We also try, however, to bring you subjects which are outside the mainstream yet still can be grouped loosely within the areas of geochemistry, mineralogy and petrology. That is how we categorise the current issue dealing with the environmental aspects of making high-quality wine.

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The Excitement of Science Discoveries in the Blue Sky

The articles in this “Comets” issue of Elements provide a fascinating account of comets and the making of our planetary system. We learn why comets are visible to the naked eye and about their complex organic geochemistry, the surprising find of free O2, and the likelihood of a comet impact on Earth. Perhaps most impressively, we learn about the tremendous effort that goes into the exploration of comets. These missions require decades of design, planning, and instrument miniaturization and their culmination captures our imagination in a way little else can. Who could not be enthralled by the evocatively named Stardust mission returning a few thousand grains of dust from comet Wild 2 to Earth? We collectively shared the despair when communication was lost from Rosetta’s Philae lander on comet 67P/Churyumov–Gerasimenko, and the excitement about the unparalleled wealth of information sent back during its 70 hours of life on the comet’s surface.

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Food for Geological Thought

I recently asked a first-year student what the difference was between a rock and a mineral and he replied, “A rock is like a salad…” His immediate reply started me thinking about using food analogues to teach geological concepts. I subsequently found this approach has been widely studied and proven to be effective. For example, Baker et al. (2004) used the viscosities of common foods as analogues for silicate melts to help teach students about igneous processes.

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Your Next Conference: Combat Greenhouse Gas Emissions and Stay at Home

Last year, I left a terrible carbon footprint. On top of an already travel-packed year, I flew from Berlin to San Francisco for the American Geophysical Union (AGU) Fall meeting. With my >18,000 km round trip to San Francisco, I emitted ~2 tonnes of CO2 to the atmosphere (which alone amounts to the global per capita emissions required by 2050 to meet the 2 °C warming goal, not even counting my energy consumption for everyday life).

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Mineral Resources and The Limits of Growth

In writing an editorial for this issue on mineral resources, I was immediately reminded of The Limits to Growth (Meadows et al. 1972), a book that I read avidly from cover to cover as a young post-doc. For anybody interested in humanity’s effect on the environment and its near-term consequences, it is still a fascinating read. The authors summarised a computer model of the likely effects of sustained economic growth on the Earth and the human population. Based on historical data from 1900 to 1970, they observed exponential growth in total human population, resource consumption, food consumption, industrialisation and environmental pollution.

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