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First rock dating experiment performed on Mars
Although researchers have determined the ages of rocks from other planetary bodies, the actual experiments — like analyzing meteorites and moon rocks -- have always been done on Earth. Now, for the first time, researchers have successfully determined the age of a Martian rock — with experiments performed on Mars. The work, led by geochemist Ken Farley of the California Institute of Technology (Caltech), could not only help in understanding the geologic history of Mars but also aid in the search for evidence of ancient life on the planet.
The December issue of Elements magazine (volume 9, issue 6) is in press. Take a small crystal of garnet, a common mineral with built-in chronometers and uncommon properties due to its crystalline structure, study it, and suddenly you have insights on large-scale processes like plate subduction, timing and duration of metamorphism, seismicity, and more. The authors in this issue, assembled by guest editors Ethan F. Baxter (Boston University), Mark J. Caddick (Virginia Tech), and Jay J. Ague (Yale University), take us on a whirlwind tour of the mantle and crust, and inform us on the technological applications and the place in history of this beloved mineral.
Current Geochemical Society members can access this issue now via the Elements online archive using your email address (UserID) and member number (Password).
Top 10 reasons for coming to Goldschmidt in California
All looks set for another great Goldschmidt Conference in June. The list of sessions is now available with more than 170 sessions in 26 themes. Abstract submission and registration will open on Jan. 1, 2014. The abstract deadline will be Feb. 1, 2014 and all delegates may submit two abstracts this year. The Convention Center in Sacramento is a great venue for a conference. Plan to join us there!
Top 10 reasons for coming to Goldschmidt in California
California begins here ...
- The high quality of science you expect from a Goldschmidt
- Sacramento is a friendly and walkable city
- Special program for early career delegates
- A rich and varied social program
- Close to Napa Valley and other wine regions - take home great wine!
- The climate's great for outdoor recreation
- Accommodation for every budget
- Spacious lecture rooms and poster locations
- Short drive to Lake Tahoe, Yosemite, San Francisco, Mendocino, Gold Country and more
- Opportunity to submit two abstracts as presenting author (only one for oral presentation)
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New in GCA (v.123, 15 December 2013)
Contrasting geochemical cycling of hafnium and neodymium in the central Baltic Sea
A re-evaluation of the Mn–Cr systematics of olivine from the angrite meteorite D'Orbigny using Secondary Ion Mass Spectrometry
Mg in plagioclase: Experimental calibration of a new geothermometer and diffusion coefficients
Across-arc geochemical variations in the Southern Volcanic Zone, Chile (34.5–38.0°S): Constraints on mantle wedge and slab input compositions
The classification of CM and CR chondrites using bulk H, C and N abundances and isotopic compositions
Boron isotopic composition of tourmaline, prismatine, and grandidierite from granulite facies paragneisses in the Larsemann Hills, Prydz Bay, East Antarctica: Evidence for a non-marine evaporite source
[open access] Magma storage, transport and degassing during the 2008–10 summit eruption at Kīlauea Volcano, Hawai'i
Discerning crystal growth from diffusion profiles in zoned olivine by in situ Mg–Fe isotopic analyses
[open access] B content and Si/C ratios from cultured diatoms (Thalassiosira pseudonana and Thalassiosira weissflogii): Relationship to seawater pH and diatom carbon acquisition
Rate law of Fe(II) oxidation under low O2 conditions
Antarctica ice may be hiding some other 'ice' — diamonds
Antarctica might have a new kind of ice — diamonds might exist there, a new study finds,
The finding, detailed in the journal Nature Communications, suggests the gems could be found on every continent, researchers say.
Seabed scars raise questions over carbon-storage plan
Like a porpoise on the prowl, the sleek submersible HUGIN tracks its prey with sonar chirps. But the hunter set loose in the waters of the North Sea is not pursuing fish — the robot is trawling for geological clues that could help to determine whether billions of tonnes of carbon dioxide can be stored below the sea floor for centuries, keeping it from warming the planet.
Organics preserved in ancient meteorite-formed glass
Scientists have found organics from Earth's swamp trapped inside of glass created by a meteor impact almost a million years ago. The tiny pockets, only micrometers across, contain material such as cellulose and proteins. Though the impact glass was found on Earth, scientists say that similar samples could have been thrown into space by this or other blasts, allowing organics to be transported from one planet to another.
Researchers find evidence for catastrophic oceanographic events associated with climate change
Members of a U.N.-sponsored research team with members from Appalachian State University's Department of Geology have found evidence for catastrophic oceanographic events associated with climate change and a mass extinction 375 million years ago that devastated tropical marine ecosystems.
Earth's greatest killer finally caught
The Weather Channel
Geology is partly detective work, and scientists now have enough evidence to book a suspect in the biggest environmental catastrophe in Earth's history.
Painstaking analysis of rocks from China and Russia prove the culprit is a series of massive volcanic eruptions, which flooded ancient Siberia with thick lava flows just before Earth's worst mass extinction almost 252 million years ago, researchers said earlier this month at the annual meeting of the American Geophysical Union.
Geochemical Society Content Editors: Martin Elsner, Shuhei Ono,
Lesley Warren, and Helen Williams
Colby Horton, Vice President of Publishing, 469.420.2601
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