Planetary Sciences Division Seminar
Title : Impact-induced textures and phase transformations in shocked Indian meteorites.
Date : 03-05-2024
Time : 16:00:00
Speaker : Dr. Kishan Tiwari
Area : Planetary Sciences Division
Venue : ROOM NO 113 (THALTEJ CAMPUS)
Abstract
Hyper-velocity impact between planetary bodies induces high-pressure and high-temperature conditions triggering polymorphic transformation within the impacted materials. Moreover, such impacts lead to the fragmentation of the impactor with fragments dislodged in all directions. Some of these fragments eventually fall on Earth as shocked meteorites. Here, I will present my analysis of shocked Indian meteorites. I will discuss different high-pressure phases and shock-induced textures present in these meteorites and their formation conditions.
Title : High precision Al-Mg isochron of calcium Aluminium Rich Inclusions from IMS-1280
Date : 10-05-2024
Time : 16:00:00
Speaker : Ankit Prakash Singh
Area : Planetary Sciences Division
Venue : SEMINAR ROOM NO # 113/114 (THALTEJ CAMPUS)
Abstract
Calcium Aluminium rich Inclusions are one of the first formed solids of our solar system ~4568.7 myr. It is suggested that 26Al, an SLR (which decays into 26Mg) with a half-life of 0.717 Myr, was homogenously distributed throughout in the solar system. For this reason, the initial abundance of 26Al is widely used to determine the relative chronology of the early solar system. Using the Al-Mg systematics, the primitive CAIs are identified which will be further analyzed for Ca-K systematics. In this talk, I will present the high-precision SIMS data obtained for Al-Mg systematics from IMS 1280 at CRPG, Nancy. Further, I will talk about the Ca-K systematics and standard run that was done at high mass resolution to remove the isobaric interferences. The dataset obtained from the standard run resulted in the deliberation and preparation of new synthetic standards of refractory minerals of varying Ca/K ratios.