ich stolpere gerade über die Bilder von der chondritischen Lithologie von Almahata Sitta. Ist das nicht phantastisch?
Absolut phantastisch !
Hier übrigens der Abstract zum Artikel "
Almahata Sitta—Fragment MS-CH: Characterization of a new chondrite type" , gerade frisch Online erschienen in
Special Issue: 2008 TC3 and Almahata Sitta (
http://onlinelibrary.wiley.com/journal/10.1111/%28ISSN%291945-5100/homepage/custom_copy.htm)
Abstract– Among the several hundred, mostly small meteorite fragments, recovered within the Almahata Sitta strewn field, one fragment (MS-CH), weighing 5.68 g, was detected that represents a new type of chondritic meteorite. The detection of short-lived cosmogenic radionuclides clearly indicates that this chondrite fragment results from a fresh meteorite fall consistent with the Almahata Sitta event in October 2008. The fundamental mineralogical characteristics of the Almahata Sitta fragment MS-CH can be summarized as follows: (1) the almost equilibrated olivine has high Fa contents of about 36 mole%. The fragment is of petrologic type 3.8 ± 0.1; (2) the metal abundance of the rock is on the order of 2.5 vol%; (3) the mean chondrule size has been determined to be roughly 450 μm; (4) point-counting and imaging indicate that the matrix abundance is approximately 45 vol%; (5) Cr-spinels have much lower TiO2 concentrations than typical spinels within R chondrites; (6) calcium-aluminum-rich inclusions are spinel-rich and severely altered having abundant Na- and/or Cl-rich alteration products. Spinel also contains significant concentrations of Fe and Zn; (7) magnetites and platinum-group element-rich phases (sulfides, tellurides, and arsenides) characteristic of both R and CK chondrites were not found in fragment MS-CH; and (8) the mean oxygen isotope composition of three small fragments of Almahata Sitta MS-CH is δ17O = +4.35‰, δ18O = +4.94‰, and Δ17O = +1.76‰. The oxygen isotopes relate MS-CH to R chondrites.
No established chondrite group having all these characteristics exists.Hat jemand Zugang zu der digitalen Version der Special Issue?
Wie komme ich denn als Normalsterblicher an diese Special Issue, bzw. nur
an den Artikel "Almahata Sitta—Fragment MS-CH: Characterization of a new chondrite type" um ihn meinem MS-CH Scheibchen beizulegen?
Muss ich mich unbedingt registrieren lassen und was kostet so ein Artikel eigentlich?
Da kennen sich doch bestimmt einige von euch besser aus als ich, oder?
Grüße
Martin
