The Ti and Cr isotopic compositions of CAIs additionally show that CAIs alone cannot be responsible for the compositional difference between the non-carbonaceous chondritic (NC) and carbonaceous chondritic (CC) isotopic reservoirs but nevertheless do play a role in the formation of these large-scale isotopic reservoirs in the early Solar System. The ε 50Ti and ε 54Cr isotopic compositions of CAIs are not correlated, further demonstrating that these isotopic anomalies have different carrier phases. The isotopic composition of CAIs is therefore likely the result of a combination of factors, including mixing of material inherited from their formation region, heterogeneous carrier phase distribution, and thermal processing in the disk. The narrow range in isotopic anomalies in CAIs when compared to other early-formed refractory inclusions such as platy hibonite crystals (PLACs) and spinel-hibonite inclusions (SHIBs) suggests that CAIs record the mixing of these precursor materials and the averaging of their larger isotopic anomalies. With this data, we aim to better constrain the compositional range of CAIs in ε 50Ti versus ε 54Cr space, thereby facilitating the isotopic characterization of the material inherited by the solar protoplanetary disk and the role of CAIs in the formation of distinct planetary-scale isotopic reservoirs in our early Solar System. What does ZH STRUKT KHIM abbreviation stand for List of 1 best ZH STRUKT KHIM meaning form based on popularity. Electron-donor ability of bis-cyclopentadienyl derivatives of tungsten (AlkC 5 H 4) 2 WX 2 (Alk Me, Et, n-Pr, n-Bu, i-Pr, t-Bu X Cl, Br, I), towards the strong -acids tetracyanoethylene and 7,7,8,8-tetracyanoquinodimethane, has been studied using the method of UV absorption spectroscopy.

We report mass-independent Ti and Cr isotopic anomalies in several CAIs from more » CV and CK chondrites this is the first report of the Cr isotopic composition of a CAI from a CK chondrite. Although CAIs from several CV, CK, CM, CO, and ordinary chondrites have been analyzed previously for their Ti isotopic compositions, CAIs from just three CV chondrites have been analyzed for their Cr isotopic compositions, and only a handful of CAIs have been measured for both their Ti and Cr isotopic compositions. As the earliest-dated solids in our Solar System, calcium-aluminum-rich inclusions (CAIs) provide a record of their formation environment near the young Sun and hold clues to the formation of planetary-scale isotopic reservoirs in the solar protoplanetary disk.

Zhur. strukt. khim.