Summary
The Chiang Khan meteorite fell on 18th November, 1981 at Chiang Khan, Thailand. It consists of olivine, orthopyroxene, clinopyroxene, Fe-Ni metal, troilite, chromite, plagioclase, glass, and phosphate in order of abundance. Olivine forms barred or porphyritic chondrules, and its composition is uniform (average Fo80.2), close to the average composition of olivine in equilibrated H chondrites. Orthopyroxene and clinopyroxene also have compositions similar to those in equilibrated H chondrites. Both well-defined chondrules and their broken fragments are present in the recrystallized matrix. Microcrystalline plagioclase and clinopyroxene often occur in the groundmass of chondrules, but clear interstitial plagioclase is absent. Chemical composition of chromite plots in the field of chromites in H chondrites. Chiang Khan meteorite is thus classified as an equilibrated H 5 type chondrite. The equilibrium temperatures estimated by using mineral pairs are as follows: Opx-Cpx 800–900°C; Ol-Chromite 510°C.
Water content is 0.24 wt %, and the hydrogen isotopic composition (ΔD) is −89.5‰
In the thermal demagnetization experiment magnetization steadily decreased from 0 to 500°C, whereas the remanent magnetization obtained in the A.C. demagnetization experiment is very unstable, probably owing to the large grain size of the Fe-Ni metal.
Similar content being viewed by others
References
Afiattalab F, Wasson JT (1980) Composition of the metal phases in ordinary chondrites: Implications regarding classification and metamorphism. Geochim Cosmochim Acta 44: 431–446
Bunch TE, Keil K, Snetsinger KG (1967) Chromite composition in relation to chemistry and texture of ordinary chondrites. Geochim Cosmochim Acta 31: 1569–1582
Clarke RS, Jr (1982) Fall of the Chiang Khan, Thailand, meteorite. Meteoritics 17: 94
Graham AL, Bevan AWR, Hutchison R (1985) Catalogue of meteorites. British Museum, London, 460p
Kretz R (1982) Transfer and exchange equilibria in a portion of the pyroxene quadrilateral as deduced from natural and experimental data. Geochim Cosmochim Acta 46: 411–421
Kuroda Y, Suzuoki T, Matsuo S (1977) Hydrogen isotope composition of deep-seated water. Contrib Mineral Petrol 60: 311–315
Lindsley DH (1983) Pyroxene thermometry. Amer Mineral 68: 477–493
Momose K-I, Nagai H (1985) Low temperature remanent magnetization of Fe-Ni alloy. J Geomag Geoelectr 37: 817–821
—— ——Muraoka Y (1984) The Martensitic transformation and the change of thermoremanent magnetization (TRM). Mem Natl Inst Polar Res Spec Issue 35: 298–301
Nagahara H (1980) Petrology of “equilibrated” chondrites 2. Metamorphism and thermal history. Mem Natl Inst Polar Res Spec Issue 17: 32–49
Roeder PL, Campbell IH, Jamieson HE (1979) A reevaluation of the olivine-spinel geothermometer. Contrib Mineral Petrol 68: 325–334
Robert F, Javoy M, Halbout J, Dimon B, Merlivat L (1987) Hydrogen isotope abundances in the solar system. Part 11: Meteorites with terrestrial-like D/H ratio. Geochim, Cosmochim Acta 51: 1807–1822
Van Schmus WR (1969) Mineralogy and petrology of chondritic meteorites. Earth Sci Rev 5: 145–184
——Wood J (1967) A chemical-petrologic classification for the chondritic meteorites. Geochim Cosmochim Acta 31: 746–765
Yagi K, Kuroda Y, Koshimizu S (1982) Chemical composition and fission-track age of some Muong Nong-type tektites. Mem Natl Inst Polar Res Spec Issue 25: 162–170
Author information
Authors and Affiliations
Additional information
With 9 Figures
Rights and permissions
About this article
Cite this article
Yagi, K., Kimura, M., Kuroda, Y. et al. Petrology and magnetic properties of the Chiang Khan, Thailand, meteorite. Mineralogy and Petrology 40, 173–182 (1989). https://doi.org/10.1007/BF01164487
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01164487