Naslov
Glass spherules in Upper Eocene flysch of Croatian Adriatic - evidence of an impact into carbonate target?

Autori
Marjanac, Tihomir ; Bermanec, Vladimir: Premec-Fuček, Vlasta ; Marjanac, Ljerka ; Tomša, Ana Marija

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
40th ESLAB 1st International Conference on Impact Cratering in the Solar System, Proceedings / - Noordwijk : European Space Agency, 2006, 231-236

Skup
40th ESLAB 1st International Conference on Impact Cratering in the Solar System

Mjesto i datum
Noordwijk, Nizozemska, 08.05.2006. - 12.05.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Recenziran

Ključne riječi
impact, distal ejecta, spherules, Eocene, flysch

Sažetak
Glass spherules occur at 7 levels in Late Eocene flysch marls of Central Dalmatian Basin (Croatian Eastern Adriatic), which are exposed in hinterland of the city of Solin. The spherules occur at one level in Globigerinatheka semiinvoluta zone, and in six levels of Globigerinatheka index zone, and their stratigraphic spacing ranges from 1, 5 m to 93, 3 m. The best studied, and with most spherules recovered, is a composite turbidite 2-7, which is youngest in the sequence. It comprises impact-generated debris in its marl part, which is represented by perfectly clear (sometimes slightly dimmed) glass spherules 91 to 530 μ across ; teardrop transparent microtektites 1225 μ long, and fragments of vesicular glass 450 to 1000 μ across. Some spherules and microtektites comprise small bubbles with diameter up to 41 μ. Chemical composition of the spherules, poor in SiO2 and relatively rich in CaO and MgO indicates possible carbonate target.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA