We did a high resolution bathymetric survey of the seamount, that rise from 3100 m to 950 m at the top. The complex is formed by a central cone and by two smaller edifices to the south. The westernmost edifice has the shape of a collapsed caldera. On the eastern flank of the volcano a small cone 200 m high was found.
Two dredges (8, 9) were collected on the southern slope of main cone and on the northern scarp of southern cone. We recovered altered mostly aphyric basalts and dolerites with chlorite, and rather fresh vesicular Ol-Cpx-Pl phyric basalts. An Heat Flow (HF01) station was performed in a flat area south of the main cone. From Shona seamount we moved NE toward MAR. Another Heat Flow station (HF02) was done at a depth of 2640 m, slightly NE of Shona. The gravity core recovered diatomitic layers interbedded with levels of volcanoclastic sediments. Gravity and magnetic data in the transect to the MAR revealed a very interesting pattern of high frequency anomalies.
Figure 10 shows the investigated area.
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