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View PDF File Volume 40, Number 2 September 2017 Curator’s Comments A periodical issued by the Meteorite Kevin Righter, NASA-JSC Working Group to inform scientists of the basic characteristics of specimens This newsletter reports 222 new meteorites from the 2014, 2015 and 2016 recovered in the Antarctic. ANSMET seasons from Dominion Range (DOM14), Miller Range (MIL15), Edited by Cecilia Satterwhite and Kevin and Elephant Moraine (EET16). Meteorites include eight CK, seven CM2, Righter, NASA Johnson Space Center, one CM1, one CM1/2, two CV3, one EH3, one H impact melt chondrite, as Houston, Texas 77058 well as three IAB irons, two howardites, one diogenite, one acapulcoite, one winonaite, and one ureilite. The presence of a large L chondrite shower amongst the DOM samples continues (Righter et al., LPSC 2017 abstract # 2396); we are in the process Inside this Issue of updating classifications of all DOM equilibrated ordinary chondrites, so Curator’s Comments...................1 those interested in this collection area should be forewarned that the classi- New Meteorites...........................4 fications may change in the near future. Many of the Elephant Moraine Location Abbreviations samples announced here are possibly paired with samples collected in pre- and Map................................4 Table 1: Newly Classified vious seasons and so those interested should consider this carefully. For Antarctic Meteorites................5 example, there are previous pairing groups from EET for CK, CM, diogenite, Table 2: Newly Classified howardite, IAB irons. We will update pairings as necessary as more infor- Meteorites by Type................10 mation becomes available for these samples. Notes to Tables 1 & 2..................10 Table 3: Pairing..........................12 Reminder to acknowledge samples received from NASA-JSC Petrographic Descriptions..........13 When publishing results of your research, please include the split numbers Sample Request Guidelines........18 used in the research. Antarctic Meteorite Laboratory Contacts..............................18 Meteorites On-Line....................19 We also request that scientists use the following acknowledgement state- ment when reporting the results of their research in peer reviewed journals: “US Antarctic meteorite samples are recovered by the Antarctic Search for Meteorites (ANSMET) program which has been funded by NSF and NASA, and curated and characterized by the Astromaterials Curation Office at NASA Johnson Space Center and Department of Mineral Sciences of the Smithsonian Institution.” Such an acknowledgement will broaden the aware- ness of the funding mechanisms that make this program and these samples possible. We suggest you find out how to acknowledge samples received from all the collections/museums from which you have received materials so that all the institutions making samples available to you receive proper credit and acknowledgement. Sample Request Deadline MWG Meets Sept. 21, 2017 Oct. 5-6, 2017 1 Free publication available at: http://curator.jsc.nasa.gov/antmet/amn/amn.cfm Report from the Smithsonian Cari Corrigan Things are rolling along in the Division of Meteorites at the Smithsonian. Our new instrument is officially up and running! We are pleased to report that we have completed the installation and testing of our new electron microprobe (a JEOL JXA 8530f+ Hyperprobe) and we signed off on it in May. It will be used to classify the Antarctic Meteorites and will provide us with state of the art capabilities to do so. Our hopes from the Spring 2017 newsletter that all of the microprobe analyses in the Fall newsletter might come to you from the new instrument have been fulfilled. Here we report compositional data on about 50 new meteorite thin sections obtained using the new instrument. It was a pleasure putting together that portion of this newsletter (despite the struggles due to our learning curve)! Many thanks to our volunteers, Doug Ross and recent Beloit College geology graduate/new volunteer Alex Venzke for their assistance with this newsletter. The new electron microprobe (JEOL 8530F Hyperprobe) at the Smithsonian Institution ANSMET 2016-2017 Field Season Jim Karner, Ralph Harvey and John Schutt Case Western Reserve University This season’s ANSMET field plan is basically a “re-do” for eight persons to deploy to the SHG camp in mid- of last year’s. Last year our plans changed drastically December. The eight will then split into two teams of just before the start of the season due to severe logisti- four that will perform meteorite search and recovery at cal constraints. The US Antarctic Program (USAP) had separate sites near SHG. “Team A”, led by Jim Karner, been planning for years to set up the Shackleton Gla- will conduct season-long systematic recoveries at the cier (SHG) camp, a temporary logistics hub in a part of icefields around Mt. Cecily, Mt. Raymond and Mt. Emily. the southern Transantarctic Mountains that is otherwise This is a beautiful site in the Grosvenor Mts. that was difficult to reach, to support a wide range of science first explored in 1985 and revisited about a decade later projects. We had hoped to use the enhanced local air (one of the homes of GRO meteorites). Team A will work support provided by SHG to operate two four-person at these icefields for the entire season (about six weeks), teams in the area; one dedicated to systematic recov- and weather allowing, may finish recovery efforts in the eries and one conducting reconnaissance. Unfortu- area. nately, after SHG was successfully established, a short- age of operational cargo aircraft and a resulting lack of “Team B”, led by John Schutt, is dedicated to recon- fuel at SHG squashed our plans as well as those of naissance. There are several interesting icefields in the many other teams. After quickly shuffling through many headwaters region of the Amundsen Glacier, only one possible alternative plans, we opted to send one team of which has been previously visited (Mt. Wisting/Mt. to conduct systematic recovery of meteorites in the El- Prestrud, where 26 meteorites were recovered in a few ephant Moraine (EET) icefields for a shortened sea- days in 1995). Team B will revisit that icefield and make son. first visits at several others on or near the Amundsen Glacier, Nodvedt Nunatak, and other sites in the region. Given reassurances from the US Antarctic program, we This should included a few one-day helicopter visits, lo- are going to give working out of SHG another shot for gistics-permitting. The main goal for Team B is to get the 2017-2018 field season. Our plan once again calls boots on the ground at these sites and provide a good 2 understanding of the potential of each for future recov- mid-2022, with yearly deployments of field teams as in eries. This kind of reconnaissance is essential to the past (Woohoo!). We now fall under the aegis of ANSMET- not only does it (hopefully) discover new me- Planetary Defense as part of the Near Earth Object Ob- teorite concentrations, it aids the prioritization of future servatories program (arguably “observing” the “nearest” work and maximizes associated recoveries for the plan- of said objects). This provides very welcome stability etary materials community. after several years of uncertainty in funding, and should ensure uninterrupted recoveries........assuming aircraft In programmatic news, ANSMET has been successfully and fuel are available, of course. funded for the next five years, which will take us through Target icefields for the 2017-18 field season. The red triangle shows the location of the Shackleton camp. ANSMET team A will systematically search at the icefields around Mts. Cecily / Raymond / Emily, while team B will conduct reconnaissance further south, among the icefields in the headwaters region of the Amundsen Glacier 3 New Meteorites 2014-2016 Collection Pages 5-17 contain preliminary de- Macroscopic descriptions of stony me- Meteorite descriptions contained in scriptions and classifications of me- teorites were performed at NASA/JSC. this issue were contributed by the teorites that were completed since These descriptions summarize hand- following individuals: publication of issue 39(2), Sept. specimen features observed during 2016. Specimens of special petro- initial examination. Classification is Rachel Funk, Roger Harrington logic type (carbonaceous chon- based on microscopic petrography and Cecilia Satterwhite drite, unequilibrated ordinary chon- and reconnaissance-level electron mi- Antarctic Meteorite Laborabory drite, achondrite, etc.) are repre- croprobe analyses using polished sec- NASA Johnson Space Center sented by separate descriptions un- tions prepared from a small chip of Houston, Texas less they are paired with previously each meteorite. For each stony me- described meteorites. However, teorite the sample number assigned Cari Corrigan, Julie Hoskins, Doug some specimens of non-special to the preliminary examination section Ross and Tim McCoy petrologic type are listed only as is included. In some cases, however, Department of Mineral Sciences single line entries in Table 1. For a single microscopic description was U.S. National Museum of Natural convenience, new specimens of based on thin sections of several History - Smithsonian Institution special petrological type are also specimens believed to be members of Washington, D.C. recast in Table 2. a single fall. Antarctic Meteorite Locations ALH — Allan Hills MBR — Mount Baldr BEC — Beckett Nunatak MCY — MacKay Glacier BOW — Bowden Neve MET — Meteorite
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