Introduction: Refactory forsterites are widespread components of all types of unequilibated chondrites. They occur in concentrations up to 0.3 vol.% and are extremly poor in Fe, Ni, Co and Mn and are rich in refractory lithophile elements (Ca, Al, Ti, Sc, V, REEs) [1,2]. A further characteristic of refractory forsterites ist that they are often significantly enriched in O [3]. In order to trace...

Chondrites are the likely building blocks of Earth, and identifying group chondrite that best represents Earth is a key to resolving state early Earth. The origin chondrites, however, remains controversial partly because their puzzling major element compositions, some exhibiting depletion in Al, Ca, Mg. Based on new thermochemical evolution model protoplanetary disks, we show planetesimals with...

We used INAA to determine the bulk compositions of 10 carbonaceous chondrites of uncertain classification. Most samples were analyzed in duplicates and the averaged results are given in Table 1 and shown in Figs. 1 and 2. Thin sections were examined microscopically. Mgand Cr-normalized abundance patterns show clear identifications for four specimens (Fig. 1. The others have nonindicative elemen...

We show that fragments from the Gefion family-forming event are the probable source of the shocked L chondrite meteorites, which represent about 2/3 of all L chondrite falls. The 100-150 km diameter Gefion parent body, which had semi-major axis a ≈ 2.8 AU, experienced a super-catastrophic disruption ∼ 470 Ma. This event injected tiny fragments immediately into the 5:2 mean motion resonance with...

Abstract One of the outstanding questions in planetary science is to determine how fundamental mechanical and physical properties materials thermal evolution asteroids, which have greatest influence. We investigate effects uncertainty material asteroid parent bodies on ability models constrain sizes formation times ordinary chondrite asteroids. A simple model formulated for body 25143 Itokawa. ...

Abstract Fireball networks are used to recover meteorites, with the context of orbits. Observations from these cover bright flight, where meteoroid is luminescent, but a fallen meteorite, observations must often be predicted forward in time ground estimate an impact position. This dark-flight modeling deceptively simple, there hidden complexity covering precise interactions between meteorite an...

We have studied the REE distribution in shallow marine continental platform carbonates belonging to two late Neoproterozoic basins of India. Their REE abundance patterns normalized by chondrite display well defined W-type tetrad effect. Based on chondrite-normalized Gd/Ho, La/Nd ratios, the REE abundance patterns have been classified into three groups. (Y/Ho) and (Y/Dy) concentration ratios ref...

Meteorites contain relict decay products of short-lived radionuclides that were present in the protoplanetary disk when asteroids and planets formed. Several studies reported a high abundance of Fe (t1/21⁄42.6270.04 Myr) in chondrites (Fe/Fe 6 10 ), suggesting that planetary materials incorporated fresh products of stellar nucleosynthesis ejected by one or several massive stars that whole rocks...