Study of meteoritic matter for precise regional stratigraphy

• Autorzy: Raukas Anto
• Konferencja: The Dating of Quaternary Marine and Land sediments (21-25.06.1999 ; Poznań, Poland)
• Języki publikacji: EN

Abstrakty

EN

New physical and isotope-geochemical methods and improvement of old classical methods have considerably enlarged our knowledge not only of the physical age of the deposits but also of the palaeogeographic situation in the past. During the last hundred years, microscopic glassy and ferrous spheroids of different origin have often been found in various geological formations. In 1996, IGCP project 384 “Impact and Extraterrestrial Spherules: New Tools for Global Correlation” with a duration of five years (1996-2000) was launched. Estonia with its two well-known astroblems (Kardla, Neugrund) and three groups of Holocene craters (Kaali, Ilumetsa, Tsoorikmae) serves as a key region for this kind of studies. The concentration of magnetite-silicate microimpactites in certain layers of peat in the surroundings of the Kaali and Ilumetsa craters suggests that the Holocene impact events can be precisely dated on the basis of l4C dates and pollen evidence, and serve as good regional chronostratigraphical markers. The age of the Kaali craters is approximately 7500 and Ilumetsa craters about 6600 years BP.

Słowa kluczowe

EN

meteorite impact; microimpactites; spherules; chronostratigraphical markers

PL

uderzenie meteorytu; mikroimpaktyty; sferule

• Wydawca: Uniwersytet im. Adama Mickiewicza. Instytut Geologii
• Czasopismo: Geologos
• Rocznik: 2000
• Tom: Vol. 5
• Strony: 77--86
• Opis fizyczny: Bibliogr. 13 poz.

Twórcy

autor

Raukas Anto

• Institute of Geology at Tallinn Technical University, 7 Estonia Avenue, 10143 Tallinn, Estonia

Bibliografia

• Aaloe A., 1958: Kaalijärve meteoriidikraatri nr. 5 uurimisest 1955. aastal. ENSV TA Geoloogia Instituudi Uurimused, 11: 105-117.
• Aaloe A., 1981: Erinevused Kaali kraatrite vanuse määrangutes. Eesti Loodus, 4: 236-237.
• Aaloe A. & Tiirmaa R„ 1981: Pulverized and impactite meteoritic matter in the Kaali crater field. Eesti NSV Teaduste Akadeemia Toimetised. Geoloogia, 30, 1: 20-27 [in Russian, Estonian and English sum.].
• Czegka W. & Tiirmaa R., 1998: Das holozäne Meteoritenkraterfeld von Kaali auf Saaremaa (Ösel), Estland. Aufschluss, 49: 233-252.
• Kessel H., 1981: Kui vanad on Kaali järviku põhjasetted? Eesti Loodus, 4: 231-235.
• Liiva A., Kessel H. & Aaloe A., 1979: Ilumetsa kraatrite vanus. Eesti Loodus, 12: 762-764.
• LÕUGAS V., 1995: Must auk Saaremaa ajaloos. Luup, 2: 52-56.
• Raukas A., Pirrus R., Rajamäe R. & Tiirmaa R., 1995: On the age of the meteorite craters at Kaali (Saaremaa Island, Estonia). Eesti Teaduste Akadeemia Toimetised. Geoloogia, 44, 3: 177-183.
• Raukas A. & Tiirmaa R., 1998: Kaali meteorite craters - unique objects for the spherule studies. Papers presented to the 1998 Annual Meeting of I. G. C. P. 384 “Impact and Extraterrestrial Spherules: New Tools for Global Correlation”, September 28 - October 2,1998. Geological Institute of Hungary, Budapest: 86-88.
• Reinwaldt I., 1933: Kaali järv - the Meteorite Craters on the Island of Ösel (Estonia). Loodusuurijate Seltsi Aruaanded, 39: 183-202.
• Saarse L., Rajamäe R., Heinsalu A. & Vassiljev J., 1992: The biostratigraphy of sediments deposited in the Lake Kaali meteorite impact structure, Saaremaa Island, Estonia. Bulletin of the Geological Society of Finland, 63, 2: 129-139.
• Shymanovich S., Kolosova T., Raukas A. & Tiirmaa R., 1993: Extraterrestrial spherules in the surroundings of Kaali meteorite craters (Saaremaa Island, Estonia). Proceedings of the Estonian Academy of Sciences. Geology, 42, 3: 127-133.
• Tiirmaa R„ 1994: Kaali meteoriit. Eesti TA Geoloogia Instituut, Tallinn, 124 p. (in Estonian, Russian and Finnish sum.).

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).