Dear Satyendra Kumar ,

"Impact melts are simple mixtures of preexisting target rocks." (Lunar sourcebook, 1991).

In the Lunar sourcebook, edited by Heiken G.H., Vaniman D.T. and French B.M. you can find descriptions of the chemical composition of the crust, modelled impact melt etc.

@Sergey_Krasilnikov

Thank you for the answer.

I will look into it!

Dear Satyendra Kumar,

as stated before, impact melt rocks are usually a mixture of the target rock within the closer surroundings of the point of impact (i.e., the zone of strongest shock metamorphism and whole-rock melting). However, as impactites are subject to movement as the material is ejected during the cratering process (ejecta flow paths cross-cut shock pressure isobars), the hot impact melt often times incorporates clasts of target rock and minerals of variable shock level. Those lithologies are then more commonly referred to as "impact melt breccias".

Let's not forget some impact structures on Earth have melt lithologies that perserve a more or less distinct impactor component (e.g., East Clearwater Lake, Canada). Those principles should also apply on the Moon.

Best, Martin

Dear Satyendra Kumar , maybe you can expect more truth from next moon mission.

The most powerful rocket ever built will soon launch, carrying the Orion capsule that NASA hopes will soon transport astronauts back to the Moon. If all goes as planned, NASA’s Space Launch System (SLS) will launch on 29 August, fly around the Moon — farther than any spacecraft built for humans has ever gone — and return to Earth 42 days later. The mission will host a trove of satellites and radiation experiments and a tiny lander from Japan. The flight, dubbed Artemis 1, is a test run for the series of Artemis missions that NASA hopes will echo the successes of the Apollo missions. Artemis 2 will fly astronauts around the Moon, no earlier than 2024. And Artemis 3 will land a crew on the surface — including, for the first time, a woman — in 2025 or later...

https://www.nature.com/articles/d41586-022-02293-8

Ljubomir Jacić Thank You sir for your comments.