A Breccia of Ureilitic and C2 Carbonaceous Chondrite Materials from Almahata Sitta: Implications for the Regolith of Ureilitic Asteroids
نویسندگان
چکیده
ALMAHATA SITTA: IMPLICATIONS FOR THE REGOLITH OF UREILITIC ASTEROIDS. C.A. Goodrich, A. M. Fioretti, M. Zolensky, M. Fries, M. Shaddad, I. Kohl, E. Young, and P. Jenniskens. Lunar and Planetary Institute, Houston TX, USA ([email protected]); CNR – Istituto di Geoscienze e Georisorse, Padova, Italy; ARES, NASA JSC, Houston TX, USA; Dept. Physics, Univ. of Khartoum, Khartoum, Sudan; Dept. Earth and Planet. Sci., UCLA, Los Angeles CA, USA. SETI Institute, Mountain View, CA, USA.
منابع مشابه
Almahata Sitta (=asteroid 2008 TC3) and the search for the ureilite parent body
This article explores what the recovery of 2008 TC3 in the form of the Almahata Sitta meteorites may tell us about the source region of ureilites in the main asteroid belt. An investigation is made into what is known about asteroids with roughly the same spectroscopic signature as 2008 TC3. A population of low-inclination near-Earth asteroids is identified with spectra similar to 2008 TC3. Five...
متن کاملFeldspathic Clasts in Polymict Ureilites
Introduction: Ureilites are ultramafic meteorites composed mainly of magnesian (mg#=76-95) olivine and pyroxene, with minor carbon-bearing phases and metal. Ureilite characteristics suggest that monomict ureilites are residues of partial melting on a carbonaceous chondrite-like asteroidal parent body [1]. Basaltic meteorites complementary to the monomict ureilites are currently unknown, but wou...
متن کاملEvidence from polymict ureilite meteorites for a disrupted and re-accreted single ureilite parent asteroid gardened by several distinct impactors
Ureilites are ultramafic achondrites that exhibit heterogeneity in mg# and oxygen isotope ratios between different meteorites. Polymict ureilites represent near-surface material of the ureilite parent asteroid(s). Electron microprobe analyses of >500 olivine and pyroxene clasts in several polymict ureilites reveal a statistically identical range of compositions to that shown by unbrecciated ure...
متن کاملRadar-enabled recovery of the Sutter's Mill meteorite, a carbonaceous chondrite regolith breccia.
Doppler weather radar imaging enabled the rapid recovery of the Sutter's Mill meteorite after a rare 4-kiloton of TNT-equivalent asteroid impact over the foothills of the Sierra Nevada in northern California. The recovered meteorites survived a record high-speed entry of 28.6 kilometers per second from an orbit close to that of Jupiter-family comets (Tisserand's parameter = 2.8 ± 0.3). Sutter's...
متن کاملCarbonaceous chondrites as analogs for the composition and alteration of Ceres
The mineralogy and geochemistry of Ceres, as constrained by Dawn’s instruments, are broadly consistent with a carbonaceous chondrite (CM/CI) bulk composition. Differences explainable by Ceres’s more advanced alteration include the formation of Mgrich serpentine and ammoniated clay; a greater proportion of carbonate and lesser organic matter; amounts of magnetite, sulfide, and carbon that could ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2017