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• W2892448344 abstract "It is a great honor for us to deliver the citation for Prof. Dr. Thomas Kenkmann, a multitalented geologist, who has made remarkable scientific contributions in the field of impact geology over the last 20 years. With a background in structural geology, Thomas is one of the leading field geologists who has worked at numerous terrestrial impact structures making significant contributions to a better understanding of impact crater formation. However, considering Thomas just as an exceptionally talented field geologist falls way too short as he is also involved in laboratory impact cratering and shock wave experiments, remote sensing of terrestrial and extraterrestrial impact structures, microanalysis of impactites and shock features, experimental rock mechanics, and numerical modeling. This long list is probably still incomplete and we mention only those activities in which Thomas became a distinguished expert himself or where he initiated important developments by his particular ability to collaborate with colleagues of different scientific disciplines. Due to his extremely broad methodological background and his multidisciplinary approach, Thomas also continues to act as a bridge builder to close the gap between impact researchers using field observations, laboratory experiments, and numerical modeling to gain a better understanding of impact processes on Earth and other planets. Most scientists in the field of impact geology became involved in this topic early in their academic career, often already as M.Sc. or Ph.D. students. To our knowledge, Thomas was initially fascinated by tectonic structures on Earth and, coupled with his interest in architecture, he wanted to study how nature has created the given landforms on Earth—in fact, we always found it very inspiring to experience Thomas interpreting geological (impact) structures with the eyes of an architect. Like many other geologists, he initially did not consider the impact of cosmic bodies as an important geological process and, thus, he focused on tectonic processes as a student of geology at the University of Cologne and during his Ph.D. thesis at the GeoForschungsZentrum (GFZ) in Potsdam, Germany. It was Dieter Stöffler who recognized Thomas’s exceptional talent, and who got him interested in impact geology. In 1998, Thomas became part of Dieter's multidisciplinary research team at the Natural History Museum in Berlin, an experience which was certainly formative for Thomas’s holistic research philosophy later on in his career. Soon after, with his first publication (jointly with Boris Ivanov and Dieter Stöffler, both Barringer medalists) on faults in the basements of ancient impact structures, Thomas’s rapid rise into the ranks of the top researchers in impact geology began. Since then he has consistently made benchmark contributions based primarily on field work at numerous impact structures, as well as work coupled with numerical modeling, laboratory experiments, or remote sensing data of impact structures on Earth and Mars. Looking through the long list of papers, conference contributions, and popular scientific articles that Thomas has produced in only 20 years of research activity in this area, there is hardly any aspect of impact cratering and shock wave processes he has not dealt with. Among his numerous talents, Thomas is an outstanding field geologist and, speaking for myself (KW) as somebody who works mostly on the theoretical side, also an excellent field guide. I have been on several excursions with Thomas where he initiated vibrant discussions. He was able to put across his often highly innovative ideas to non–field experts, too. Furthermore, both students and colleagues alike who have joined him for fieldwork can account for his almost uncanny ability to recognize and unravel structures in the field, along with his general love of the outdoors. Early on in his impact cratering career, Thomas started to study the fault systems at impact structures (e.g., Ries crater, Germany; Upheaval Dome, USA) in order to reconstruct the mechanics of crater formation, especially the crater collapse and formation of central peaks. Over the years and through numerous field trips to different structures (e.g., Jebel Waqf as Suwwan, Jordan; Serra da Cangalha, Brazil; several impact craters in Australia and the United States), he started to notice deviations from circular geometry, which he interpreted as an indication of the direction of impact. Although his catalog of criteria for oblique impact is still debated, this example demonstrates Thomas’s exceptional ability to develop new ideas from detailed field mapping and observations serving as basis for the development of quantitative models that can be tested by computer models or laboratory experiments. Thomas has been active in both disciplines through collaboration with modelers and by initiating experimental campaigns. The impact modeling community owes a great deal to Thomas for inspiring modeling studies, many of which have led to the confirmation of processes that Thomas had suggested from observations ranging from the macroscale of terrestrial and extraterrestrial craters down to the microscale of specific shock features and the formation of shatter cones. Collaboration with Boris Ivanov, Natasha Artemieva, Alex Deutsch—all Barringer medalists—Gareth Collins, and my (KW) group has led to pioneering studies demonstrating how large-scale morphological characteristics and microscale shock metamorphic features can be linked to numerical modeling. While models are a satisfactory approach to account for the exceptional dynamics of impact cratering, they do not consider the heterogeneous nature of rocks. So it was a logical step for Thomas to become involved in laboratory impact experiments with natural and thus more complex materials. In a very early publication, he addressed the effect of heterogeneities on shock wave propagation using experiments to study the formation of local melts. Several years later, Thomas initiated the large “Multidisciplinary Experimental and Modeling Impact Research Network” (MEMIN) research unit of German impact researchers, where the very important aspect of rock heterogeneities on the entire impact process has been investigated in a quite holistic way. Thomas has been the speaker of this research unit since 2009, which has become a highly successful and productive research consortium in the field of impact research. In addition to his multiple research activities, Thomas has served the impact community by organizing two conferences (Large Meteorite Impacts III, Nördlingen, 2003; Bridging the Gap III, Freiburg, 2015), by editing four special volumes on impact cratering (GSA Special Paper No. 384, 2005—LMI; M&PS 48(1), 2013—MEMIN I; M&PS 52(7), 2017—BtG III; and the upcoming M&PS 53, 2018—MEMIN II), as a team leader of the ICDP deep drilling of the Chesapeake Bay impact structure, and as a reviewer of highly ranked journals and for international funding organizations. His dedication to impact cratering research was honored by the Governor of Utah (2009) for his work at the Upheaval Dome structure and by the Arab Union of Astrophysics and Astronomy for his work at the Waqf as Suwwan impact structure. Besides his outstanding abilities as a researcher, Thomas has also been an excellent teacher, Ph.D. supervisor, and promoter to the public. As curator of the impactites and petrographical and geological rock collections at the Natural History Museum in Berlin and of the ZERIN (Center of Ries Crater and Impact Research in Nördlingen) he was extensively involved in public outreach, he published several popular science articles, and he led the conception of an exhibition on earth science and impact cratering. In 2010, he was appointed professor and head of the Geology Department at the Albert-Ludwigs University Freiburg, Germany, honoring his scientific status and collaborative strength. His teaching talent was awarded by the Ministry of Science and Education of the federal state of Baden-Württemberg, especially for the student project “Screening Earth” to search for new impact craters. Numerous bachelor and master students have since experienced Thomas’s unbridled and youthful enthusiasm for teaching geology both in the classroom and in the field with sometimes rather unconventional methods. He has helped many young scientists to start their careers, several of which are now outstanding researchers in their own right. I (MHP) certainly would not be the researcher I am today without his ongoing support. We could carry on listing all the outstanding scientific achievements, skills, and services of Thomas, but the list would remain incomplete. Above all, we do want to emphasize that Thomas is one of the best colleagues and friends we have ever had in this business, and we owe Thomas special thanks for his friendship. His advice and support was vital in many projects we carried out together. Finally, we would like to thank all the colleagues who contributed to Thomas’s nomination. The enormous support speaks for the high reputation the awardee enjoys among the community. On behalf of all of them we sincerely congratulate Thomas on winning the Barringer Medal and Award." @default.
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• W2892448344 title "2018 Barringer Medal for Thomas Kenkmann" @default.
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