Neuer Mars Fall!?

[Chondrit 83]

Mann oh Mann,

der ist ja ein Traum 

Ich übe definitiv den falschen Beruf aus, ich sattel jetzt um auf Schafhirte 
Klasse einfach genial, besten Dank fürs Zeigen Kally 

Grüßle

Marco

[karmaka]

Eine CT-Aufnahme von Tissint aus dem Natural History Museum in London

VIDEO-LINK

Museum meteorite CT scans help prepare for space missions

Quelle

[karmaka]

Marburger Mineralogisches Museum erwarb 5,972 Gramm Tissint

LINK

[gsac]

Marburger Mineralogisches Museum erwarb 5,972 Gramm Tissint

LINK

Na ja - immerhin! Ein bißchen grösser hätte es zwar schon sein können, aber
dann auch wieder: besser als gar nichts davon! Wie überall wird es auch dort
schon recht schwierig gewesen sein, überhaupt die Mittel für eine Anschaffung
freizubekommen, was man zwar insgesamt bedauern, aber wohl selbst der Kurator
der dortigen Sammlung mit noch so viel Engagement nicht ändern kann, wenn es
"das Säckel" (aka Gilbbeutel) einfach nicht hergibt...

Dort liegt übrigens die Hauptmasse des berühmten Treysa-Meteoriten! Und allein
schon von daher (..aber nicht nur deswegen..!!) ist das Museum durchaus einen
Besuch wert!

Alex

[karmaka]

Insights into the Martian mantle: The age and isotopics of the meteorite fall Tissint

LINK

Meteoritics & Planetary Science, 4 MAR 2014, DOI: 10.1111/maps.12258

G. A. Brennecka, L. E. Borg, M. Wadhwa

The recent witnessed fall of the meteorite Tissint represents the delivery of a pristine new sample from the surface of Mars. This meteorite provides an unprecedented opportunity to study a variety of aspects about the planet's evolution. Using the Rb–Sr and Sm–Nd isotopic systems, we determined that Tissint, a depleted shergottite, has a crystallization age of 574 ± 20 Ma, an initial ε143Nd = +42.2 ± 0.5, and an initial 87Sr/86Sr = 0.700760 ± 11. These initial Nd and Sr isotopic compositions suggest that Tissint originated from a mantle source on Mars that is distinct from the source reservoirs of the other Martian meteorites. The known crystallization ages, geochemical characteristics, ejection ages, and ejection dynamics of Tissint and other similarly grouped Martian meteorites suggest that they are likely derived from a source crater up to approximately 90 km in diameter with an age of approximately 1 Ma that is located on terrain that is approximately 600 million years old.

[karmaka]

Nachtrag (für MilliesBilly) zum Beitrag #226

Lavinia Greenlaw erzählt die Hintergründe ihrer Kurzgeschichte 'We Are Watching Something Terrible Happening', die auch ein Beitrag
beim BBC National Short Story Award 2013 war. Die Lesung der Geschichte scheint leider nicht mehr frei im Netz verfügbar zu sein.

AUDIO

[karmaka]

Was für Indy gilt, Bernd, gilt auch für Ioannis: Nothing shocks him,he's a scientist 

So etwas habe ich auch noch nicht gesehen:

Dr. Ioannis Baziotis macht Youtube-Werbung für einen wissenschaftlichen Artikel
über Hochdruckphasen in Tissint

VIDEO-LINK

The Tissint Martian meteorite as evidence for the largest impact excavation

Ioannis P. Baziotis, Yang Liu, Paul S. DeCarli, H. Jay Melosh, Harry Y. McSween, Robert J. Bodnar, Lawrence A. Taylor

Nature Communications 4, Article number: 1404 doi:10.1038/ncomms2414

LINK

Supplementary information

High-pressure minerals in meteorites provide clues for the impact processes that excavated, launched and delivered these samples to Earth. Most Martian meteorites are suggested to have been excavated from 3 to 7 km diameter impact craters. Here we show that the Tissint meteorite, a 2011 meteorite fall, contains virtually all the high-pressure phases (seven minerals and two mineral glasses) that have been reported in isolated occurrences in other Martian meteorites. Particularly, one ringwoodite (75 × 140 μm2) represents the largest grain observed in all Martian samples. Collectively, the ubiquitous high-pressure minerals of unusually large sizes in Tissint indicate that shock metamorphism was widely dispersed in this sample (~25 GPa and ~2,000 °C). Using the size and growth kinetics of the ringwoodite grains, we infer an initial impact crater with ~90 km diameter, with a factor of 2 uncertainty. These energetic conditions imply alteration of any possible low-T minerals in Tissint.

PS: Befindet er sich da gerade im Geologisch-Paläontologischen Museum der Aristoteles-Universität in Thessaloniki?

[herbraab]

NanoSIMS analysis of organic carbon from the Tissint Martian meteorite: Evidence for the past existence of subsurface organic-bearing fluids on Mars

Two petrographic settings of carbonaceous components, mainly filling open fractures and occasionally enclosed in shock-melt veins, were found in the recently fallen Tissint Martian meteorite. The presence in shock-melt veins and the deuterium enrichments (δD up to +1183‰) of these components clearly indicate a pristine Martian origin. The carbonaceous components are kerogen-like, based on micro-Raman spectra and multielemental ratios, and were probably deposited from fluids in shock-induced fractures in the parent rock of Tissint. After precipitation of the organic matter, the rock experienced another severe shock event, producing the melt veins that encapsulated a part of the organic matter. The C isotopic compositions of the organic matter (δ13C = −12.8 to −33.1‰) are significantly lighter than Martian atmospheric CO2 and carbonate, providing a tantalizing hint for a possible biotic process. Alternatively, the organic matter could be derived from carbonaceous chondrites, as insoluble organic matter from the latter has similar chemical and isotopic compositions. The presence of organic-rich fluids that infiltrated rocks near the surface of Mars has significant implications for the study of Martian paleoenvironment and perhaps to search for possible ancient biological activities on Mars.

Den Artikel aus MAPS Vol. 49 (12/2014, pp. 2201–2218) gibt es hier (zugänglich für Mitglieder der MetSoc), sowie zwei Presseaussendungen aus Bayreuth und Lausanne (letzteres inklusive Video).


Herbert

[karmaka]

Petrology and trace element geochemistry of Tissint, the newest shergottite fall

Balta, J. B., Sanborn, M. E., Udry, A., Wadhwa, M. and McSween, H. Y. (2014),

Meteoritics & Planetary Science. doi: 10.1111/maps.12403

LINK

[karmaka]

5 Jahre ist es heute bereits her ...

عيد مولد سعيد تيسينت