{"id":11058,"date":"2016-12-19T18:50:34","date_gmt":"2016-12-19T17:50:34","guid":{"rendered":"http:\/\/karmaka.de\/?page_id=11058"},"modified":"2020-03-09T23:59:21","modified_gmt":"2020-03-09T22:59:21","slug":"white-mountain","status":"publish","type":"page","link":"https:\/\/karmaka.de\/?page_id=11058","title":{"rendered":"Dishchii\u2019bikoh"},"content":{"rendered":"

Dishchii\u2019bikoh Ts\u2019i\u0142s\u01eb\u01ebs\u00e9 Tsee<\/strong><\/span><\/p>\n

<\/div>\n

Meteorite fall (LL7, S3, W0) on White Mountain Apache Tribal Land, Arizona, USA on 2 June, 2016, ~10:56:28 UTC<\/span><\/p>\n

<\/div>\n
\"Three<\/a>

Three of fifteen found White Mountain meteorites \/ Image: ASU\/CMS<\/p><\/div>\n

<\/div>\n

15 meteorites (79.46 g, LL7) of the 2 June 2016 bolide (~10:56:28 UTC) have been found on White Mountain Apache Tribal land, Arizona, USA. On 29 May 2017 Dishchii\u2019bikoh<\/a> was officially registered as confirmed fall in the Meteoritical Bulletin Database. Dishch\u00ed\u00ed Bikoh<\/strong> means ‘Horizontally Red Canyon’ (Cibecue) in the language of the Cibecue Apache people and refers to the Salt River Canyon. The meteorite’s full name chosen by the Apache tribe is Dishchii\u2019bikoh Ts\u2019i\u0142s\u01eb\u01ebs\u00e9 Tsee<\/strong> \u266b<\/a> (Cibecue Star Stone).

<\/div>
Database entry:<\/p>\n

\n<\/p>

“Dishchii\u2019bikoh 33\u00b053\u20190.48″N, 110\u00b038\u20198.20″W<\/span><\/p>\n

Arizona, USA<\/span><\/p>\n

Confirmed fall: 2 Jun 2016<\/span><\/p>\n

Classification: Ordinary chondrite (LL7)<\/span><\/p>\n

History: (D. Dunlap, M. Fries, R. Garcia, L. Garvie, M. Hankey, R. Matson, P. Mane, M. Miller, R. Ward) At 3:56:34 MST (10:56:34 UTC) on 2 June 2016, a bright fireball was widely observed throughout the southwestern US. The fireball was recorded in imagery from the NOAA NEXRAD weather radar network, on the KFSX radar in Flagstaff, Arizona. Radar reflections consistent with falling meteorite material were first recorded at 10:57:12 UTC at an altitude of 9.7 km above sea level (ASL). Two additional radar sweeps recorded the event, at 11:01:14 UTC (5.1 km ASL) and 11:02:30 UTC (5.1 km ASL). The mass of meteorites for these detections was estimated at 3.7 kg, 2.15 g, and 0.54 g respectively, using M. Fries\u2019 dark-flight model J\u00f6rmungundr (v.42) and wind velocity data from a radiosonde launched from Flagstaff at 00:00 UTC. The fireball was also recorded on US Department of Defense orbital sensors, leading to a total radiated energy of 17.2 \u00d7 1010 J, with energy equivalent to 0.49 kiloton of TNT. The air-blast shockwave was recorded on the earthquake seismic network from the Payson-Strawberry station. Analysis of the Doppler radar data showed stones likely on the ground on the southwestern corner of the White Mountain Apache tribal (WMAT) lands. With the help of Jacob Moore (Assistant Vice-president of Tribal Relations, ASU), permission was granted by Ronnie Lupe, the WMAT Tribal Chairman, to enter the tribal lands and search for and collect meteorites. Laurence Garvie, Daniel Dunlap, and Prajkta Mane of ASU, and private meteorite hunters Robert Ward, Mike Miller, and Ruben Garcia searched for meteorites starting 22 June 2016. Robert Ward found the first stone, 0.93 g, at 33\u00b053\u201919.7 N and 110\u00b037\u201955.0\u2019 W. A total of 15 fusion-crusted stones weighing from 0.9 to 28.6 g, for a total of 79.46 g, were found on 22 and 23 June, 2016. The stones were found along a 1.7 km transect, with a 10.16 g stone found at 33\u00b053\u20190.48″N and 110\u00b038\u20198.20″W near the center of the finds, though this location is likely at the small end of a large strewnfield that extends to the SW.<\/span><\/p>\n

Physical characteristics: (L. Garvie, D. Dunlap, P. Mane, ASU; R. Ward, M. Miller, R. Garcia). Fifteen fusion-crusted stones for a total mass of 79.46 g. Fusion crust is dominantly shiny black, though on two stones it is brown, matte, and powdery. Five of the stones broke upon impact. Interiors are whitish gray, with uneven distribution of darker clasts to 5 mm, and troilite to 3 mm. Stones are dominantly soft with a sugary texture.<\/span><\/p>\n

Petrography: (L. Garvie, ASU) Pieces of four stones were mounted in epoxy and polished. Sections show a breccia of clasts dominated by granoblastic textures in a cataclastic matrix. Granoblastic areas: areas with this texture occur as rounded clasts with a sharp boundary to the cataclastic material. No easily recognizable chondrules were visible, though one 200-\u03bcm-sized grain may be a remnant BO chondrule, and two rounded 500 \u03bcm-sized areas with finer-grained pyroxene than enclosing material may represent former PO chondrules. Silicates typically 50 \u03bcm, some grains to 300 \u03bcm. Troilite and taenite<\/span><\/p>\n

Geochemistry: (L. Garvie ASU, P. Mane, UAz) Olivine, low-Ca pyroxene, and plagioclase dominate the sections. Microprobe results from the cataclastic and granoblastic regions are the same. Olivine Fa31.0\u00b10.3, FeO\/MnO=59.6\u00b13.4, n=14; low Ca-pyroxene Fs25.0\u00b10.3Wo1.8\u00b10.3, FeO\/MnO=35.6\u00b12.0, n=9; high Ca-pyx Fs11.2Wo43.1, FeO\/MnO=46.6, n=1; plagioclase Ab85.8\u00b11.6An10.9\u00b10.5, n=10; taenite – Ni 50.0\u00b13.1 wt%, Co 1.9\u00b10.2 wt%, Cu 0.18\u00b10.06, n=10; kamacite – Ni 3.7\u00b10.5 wt%, Co 11.8\u00b10.7 wt%, n=10; chromite – Cr\/(Cr+Al) = 0.85\u00b10.01, Fe\/(Fe+Al) = 0.79\u00b10.03, n=10; and, phosphates dominated by apatites with F 1.1\u00b10.3 wt% and Cl 4.4\u00b10.3 wt%, n=7.<\/span><\/p>\n

Classification: Ordinary chondrite, LL7, S3, W0.”<\/span><\/p>\n

<\/div>\n

The meteorite search<\/strong><\/span><\/p>\n

As announced by Arizona State University on 28 June 2016*<\/strong><\/a> fifteen meteorites (79.46 g), weighing between 0.9 and 28.6 grams, (ordinary chondrites, LL7) have been found during a 132-hour-search expedition by Arizona State University. The first pea-sized meteorite (0.93 g) was found on June 22 by Robert Ward at location at location 33\u00b053\u201919.7″ N, 110\u00b037\u201955.0″ W<\/a>. The ‘reconnaissance expedition’ was lead by Laurence Garvie who together with ASU’s assistant vice president of tribal relations, Jacob Moore, had contacted Chairman Ronnie Lupe of the tribal council of the White Mountain Apache Tribe shortly after the fall to ask permission to search on tribal land. The search team was supported by tribal chief ranger Chadwick Amos and Game and Fish director Josh Parker. Other team members were Prajkta Mane and Daniel Dunlap, two grad students of ASU’s Center for Meteorite Studies and three private meteorite hunters (Robert Ward, Ruben Garcia and Mike Miller) who had been invited upon condition that they would hand over any found meteorites to ASU. The fifteen found meteorites are property of the White Mountain Apache Tribe and will be curated at ASU. The largest specimen (28.6 g (29.35 g ?)), provisionally named LG2, was found by Laurence Garvie around this location 33\u00b053’01.8″N 110\u00b038’17.9″W<\/a> on a plateau in the southwestern corner of the White Mountain Apache Reservation. At least one more search expedition is planned. Its goal is to find larger masses to establish a strewn field map. The negotiations between ASU and the tribal council are said to be in progress. The meteorites found so far are on public display at the Center for Meteorite Studies at Arizona State University .<\/p>\n

\"The<\/a>

One large specimen (#2000.1 \/ 28.64 g) found on 2 June 2016 during first expedition on display at the CMS at ASU \/ Photo: Prajkta Mane<\/p><\/div>
\n

\"The<\/a>

Two specimens (#2000.2 \/ 10.16 g and #2000.3 \/ 0.929 g) found on 2 June 2016 during the first expedition on display at the CMS at ASU \/ Photo: Prajkta Mane<\/p><\/div>
\n

\"Laurence<\/a>

Laurence Garvie, Prajkta Mane, Daniel Dunlap, Robert Ward, Mike Miller and Ruben Garcia. (left to right) \/ Image: ASU<\/p><\/div>
\n

\"The<\/a>

The 28.65 g mass in situ \/ Photo: ASU\/CMS<\/p><\/div>
\n

\"Meteorite<\/a>

Meteorite fragments \/ Photo: Prajkta Mane<\/p><\/div>\n

Pictures of a 10.16 g specimen found by R. Garcia on 23 June , 2016 at location at location 33\u00b053\u20190.48″N, 110\u00b038\u20198.20″W<\/a>: Side A<\/strong><\/a> Side B<\/strong><\/a>
The specimen appears to be the second largest find of the first search expedition. The third largest meteorite seems to to be a specimen of 9.36 grams.<\/p>\n