RESEARCH PAPERS : Evidence for the Blake event in volcanic rocks from Lipari (Aeolian Archipelago)

Details RESEARCH PAPERS : Evidence for the Blake event in volcanic rocks from Lipari (Aeolian Archipelago) RESEARCH PAPERS : Evidence for the Blake event in volcanic rocks from Lipari (Aeolian Archipelago)

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.132..149z&link_type=abstract

Geophysical Journal International, Volume 132, Issue 1, pp. 149-158.

Astronomy and Astrophysics

Astronomy

4

Blake Event, Geochronology, Geomagnetic Reversals, Palaeomagnetism, Tyrrhenian Area, Volcanic Rocks

Scientific paper

Palaeomagnetic and geochronological measurements have been carried out on the late Pleistocene basaltic-andesitic unit of Monte Chirica-Costa Rasa, on the island of Lipari (Aeolian Archipelago). The lava flow sequence is about 10 m thick and has been sampled in detail. Magnetic properties are rather uniform; Curie temperatures of 540° to 580°C, and the saturation IRM reached at applied values of 0.1 T point to titanomagnetite as the main magnetization carrier. Thermal and AF demagnetization have shown the presence of secondary magnetization components. These were removed mostly at 450°-500°C or 20-30 mT, indicating a highly stable ChRM with directions from transitional to reverse. Where a ChRM could not be isolated by application of the demagnetization techniques, the converging remagnetization circles method gave a mean ChRM value fully comparable with that obtained from other methods. 40Ar/39Ar determinations were performed on two lava flows, in the lower and upper parts of the sequence. The former shows a transitional ChRM direction and a whole-rock age of 157+/-12 ka, the latter a reverse direction, a whole-rock age of 143+/-17 ka and a ground-mass age of 128+/-23 ka. The radiometric data and the reconstructed stratigraphy, which indicate ages of 150+/-10 ka and 104+/-3.5 ka, respectively, for the volcanic units at the bottom and top of the Monte Chirica-Costa Rasa unit, suggest that the reverse directions recorded in Lipari are related to the Blake event.

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