Feb 2018: Using EarthArXiv Preprints server for new article
Today I was using the EarthArXiv Preprints server for the first time. I uploaded a fairly technical article in which we characterize the new Cadmium-Lined Outer-Core Irradiation Tube (CLOCIT) irradiation facility that is designed for 40Ar/39Ar samples at the Oregon State University Research Reactor. We conducted the first four irradiations in this facility and looked at neutron fluxes, neutron fluence gradients, and interfering reactions from Ca and K. I need these basic data for my projects in the Franciscan complex and Argentina and hope that - now that it is open for all - future users of the facility will find them useful, too.
PS: The peer-reviewed article has appeared in Geostandards and Geoanalytical Research.
Feb 2018: Two top-10 Tectonics papers
Part 1 and 2 from our "Building the Pamir‐Tibetan Plateau—Crustal stacking, extensional collapse, and lateral extrusion in the Central Pamir" series are currently among the top-10 most accessed and cited papers in Tectonics (12-month period).
Dec 2017: Presentations at AGU - New Orleans
I will present our work on the high-grade blocks of the Franciscan (see Research site).
- Wednesday 9:30 in room 210
In an invited talk I will present new and old results on the Central Pamir gneiss domes and integrate them with other N-S extensional structures in the India-Asia collisional orogen.
- Thursday 16:00 in room 215-216
My youngest student and me at the Sketch Your Science wall.
Aug-Sep 2017: Fieldwork
I returned from fieldwork in the Sierra Pampeanas in Argentina. The mylonites and pseudotachylites were amazing, the Milanesa Napolitano was delicious and the Yerba Mate stimulating.
Jul 2017: Building the Pamir-Tibet Plateau 3 - paper in press
Part 3 of our paper series in Tectonics which was first-authored by Bradley Hacker is now in press. It details the petrology of the Pamir gneiss domes and determines rates of burial and exhumation.
May 2017: Interference of Kr with 40Ar/39Ar dating - paper in press
An article quantifying the interference of 80Kr++ with 40Ar+ in mass spectrometric measurements is now in press in Geochimica et Cosmochimica Acta. Natural Krypton is very rare in materials we would collect for dating and is irrelevant as an interference for Argon. However, we found that we produce tons of Krypton during the neutron irradiation process by transmutation of Bromine contained in the samples. This is most relevant for samples containing fluid or melt inclusions (because the inclusions host a lot of Bromine) and for dating of fluid inclusions themselves. Applying the correction method we describe will likely increase future success rates in dating fluid inclusions. I will try this myself in an upcoming project to date extensional veins in a compressive setting (stay tuned).
Apr 2017: Presentations at EGU - Vienna
I will present results from the Pamir in a talk and first results of the neutron generator project on a poster
- The Central Pamir domes as tracer of gravitational disequilibrium and deformation phases forced by deep-seated lithospheric processes; Daniel Rutte, Matthew Fox, and Lothar Ratschbacher
- Mon, 24 Apr, 15:45–16:00, Room D3
- Progress on using deuteron-deuteron fusion generated neutrons for 40Ar/39Ar sample irradiation; Daniel Rutte, Paul R. Renne, Tim Becker, Cory Waltz, Mauricio Ayllon Unzueta, Susan Zimmerman, Alan Hidy, Robert Finkel, Joseph D. Bauer, Lee Bernstein, and Karl van Bibber
- Mon, 24 Apr, 17:30–19:00, Hall X2, X2.160
Jan 2017: Building the Pamir-Tibet Plateau 1 & 2 - papers in press
Eighteen months after finishing my PhD, the bulk of my findings are finally in press in part 1 and part 2 of our "Building the Pamir-Tibet Plateau" series in Tectonics. The Pamir gneiss domes provide us with a singular window into the Asian lower crust that is not exposed elsewhere in the Pamir-Tibet plateau. We found large-scale fold nappes and thrust sheets that thickened the crust. At the same time material was evading the plateau to the West, and during an intermittent phase that lasted from ~ 22 to 15 Ma also to the North.
Both articles are real whoppers and about twice the length of a regular Tectonics article. Panoramic photographs from part 1 have even made it on the journal cover. So happy!
Sep 2016: Geological Age Standard Intercalibration - paper in press
We just published an article on the intercalibration of the Fish Canyon Sanidine (~28.20 Ma) with the Quaternary Alder Creek Sanidine (~1.18 Ma) that was first-authored by our PhD student Elizabeth Niespolo. While we reached a relative uncertainty of a tiny 0.03% in the intercalibration, we still find a discrepancy of 0.4 % in the absolute age calibration which is relevant for the comparison of 40Ar/39Ar ages with other methods. High precision dating is necessary for, e.g., sedimentary sections that are climate archives so that we can understand how fast climate changed in the past or to resolve the residence time of zircon after its crystallization to understand volcanic plumbing systems.