header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 17 Nov 2018
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Kamargaon
Basic information Name: Kamargaon
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2015
Country: India
Mass:help 12.1 kg
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  L6
Recommended:  L6    [explanation]

This is 1 of 10711 approved meteorites (plus 3 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 31 Mar 2016
Revised 8 Nov 2016: Correct name from Komar Gaon to Kamargaon
Writeuphelp
Writeup from MB 105:

Kamargaon        26°37’56.9884"N, 93°46’11.5115"E

Assam, India

Confirmed fall: 13 Nov 2015

Classification: Ordinary chondrite (L6)

History: On November 13, 2015, at 12:00 pm local time, a meteorite fell near the town of Kamargaon in the Golaghat district of Assam, India. The villagers saw the meteorite falling from the clear sky on a bright sunny day followed by 30 to 40 s of sonic booms. A 12.095 kg mass impacted in a freshly plowed field forming a 45 cm diameter by 90 cm deep hole. The superintendent of police for the Golaghat district subsequently procured the meteorite. The fall was reported in the November 14 issue of the local newspaper, Dainik Janambhumi. Details of the fall are described by Goswami et al. (2016). The meteorite was broken into four pieces and three pieces distributed as follows: 2.668 kg to the Department of Applied Geology, DibrU, ~ 2kg to the Department of Physics, Assam University, and 2.15 kg to the Jorhat Science Center and Planetarium. Goswami, T.K., Ray, D., Sarmah, R.K., Goswami, U., Bhattacharyya, P., Majumdar, D., Bezbaruah, D. and Borgohain, P. (2016) Komargaon, Assam (India) witnessed a new meteorite fall. Planex, 6 (1), 10-11.

Physical characteristics: (T.K. Goswami, DibrU) Single fusion-crusted blocky stone showing a few broad regmaglypts. Sawn surface is light greyish white with even distribution of small metal and sulfide grains and a few recognizable chondrules, one to 8 mm. Stone crisscrossed by a few shock veins. The hammered stone broke along one of the shock veins, which shows a well-developed slickenside surface. Fusion crust to 1 mm thick.

Petrography: (L. Garvie, ASU) A polished microprobe section shows dominantly coarse-grained recrystallized minerals, with few recognizable chondrules. Plagioclase, anhedral, abundant to 250 μm. Sparse chromite grains to 350 μm are anhedral with rounded outlines and heavily fractured. Troilite grains to 400 μm, single crystal and lacking shock lamellae. Metal grains to 0.5 mm, range from polycrystalline kamacite, to composite grains composed of polycrystalline kamacite, dark etched plessite and high Ni-metal. Kamacite lacks Neumann bands. Fine-grained melt pockets are present but rare. Scattered Ca-Cl and Ca-Mg-Na phosphates to 0.5 mm found.

Geochemistry: (L. Garvie, ASU) Olivine Fa25.1±0.4, Fe/Mn=48.4±3.2 wt%, n=16. Low Ca pyroxene Fs21.2±0.2Wo1.4±0.2, Fe/Mn=30.0±1.8 wt%, n=8. High Ca pyroxene Fs8.4±0.3Wo44.5±0.4, n=3. Feldspar An9.4±0.4Or6.7±0.2, n=8.

Classification: Ordinary chondrite, L6, S3, W0

Specimens: 23.4 g and one polished mount at ASU.

Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:Assam
Origin or pseudonym:field
Date:13 Nov 2015
Latitude:26°37'56.9884"N
Longitude:93°46'11.5115"E
Mass (g):12095
Pieces:1
Class:L6
Shock stage:S3
Weathering grade:W0
Fayalite (mol%):25.1±0.4
Ferrosilite (mol%):21.2±0.2
Wollastonite (mol%):1.4±0.2
Classifier:L. Garvie, ASU
Type spec mass (g):23.4
Type spec location:ASU
Main mass:DibrU
Finder:Villagers near Komar Gaon
Comments:Submitted by L. Garvie
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
DibrU: Dibrugarh University Dibrugarh-786004 Assam, India (institutional address; updated 31 Mar 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

India
Coordinates:
     Recommended::   (26° 37' 57"N, 93° 46' 11"E)

Statistics:
     This is 1 of 3 approved meteorites from Assam, India
     This is 1 of 139 approved meteorites from India (plus 10 unapproved names) (plus 2 impact craters)
Proximity search:
Find nearby meteorites: enter search radius (km):
Synonymshelp: Komar Gaon (Error made in initial announcement)

Direct link to this page