Extensional faulting on Tinos island, Aegean sea, Greece: How many detachments?

Zircon and apatite fission track (ZFT and AFT) and (U-Th)/He, 40Ar/39Ar hornblende, and U-Pb zircon ages from the granites of Tinos Island in the Aegean Sea, Greece, suggest, together with published ZFT data, that there are three extensional detachments on Tinos. The Tinos granites crosscut the Tinos detachment. Cooling of the granites was controlled by the Livadi detachment, which occurs structurally above the Tinos detachment. Our U-Pb zircon age is 14.6 ± 0.2 Ma and two 40Ar/39Ar hornblende ages are 14.4 ± 0.4 and 13.7 ± 0.4 Ma. ZFT and AFT ages go from 14.4 ± 1.2 to 12.2 ± 1.0 Ma and 12.8 ± 2.4 to 11.9 ± 2.0 Ma. (U-Th)/He ages are from 10.4 ± 0.2 to 9.9 ± 0.2 Ma (zircon) and 11.9 ± 0.5 to 10.0 ± 0.3 Ma (apatite). All ages decrease northeastward in the direction of hanging wall transport on the Livadi detachment and age-distance relationships yield a slip rate of 2.6 (+3.3 / −1.0) km Ma−1. This rate is smaller than a published slip rate of 6.5 km Ma−1 for the Vari detachment, which is another detachment structurally above the Tinos detachment. Because of the different rates and because published ZFT ages from the footwall of the Vari detachment are ∼10 Ma, we propose that the Vari detachment has to be distinguished from the older Livadi detachment. We discuss various models of how the extensional detachments may have evolved and prefer a scenario in which the Vari detachment cut down into the footwall of the Livadi detachment successively exhuming deeper structural units. The thermochronologic ages demonstrate the importance of quantitative data for constraining localization processes during extensional deformation

Sur la presence de l'Eocene dans les calcaires superieurs de l'Olympe (Thessalie septentrionale, Grece)

Abstract The presence of nummulites--?N. millecaput--and other foraminifera in the uppermost limestones of Mt. Olympus (Greece) indicates that the limestone series extends from the Triassic into the Eocene, probably Lutetian. Sandy-shaly flysch concordantly overlies these limestones. Since the limestones show effects of the orogenic movements which disturbed the internal zones of the Hellenides, the Olympus folding is attributed to the upper Eocene. It is concluded from this that Mount Olympus was emerged at the beginning of the Eocene and escaped the invasion of terrigenous material from adjacent regions.</jats:p

Sur le metamorphisme dans la zone pelagonienne orientale (region de l'Olympe, Grece)

Abstract The Mount Olympus massif of Triassic to Eocene limestone and dolomite surmounted by Eocene flysch, crops out in a fenster in the Pelagonian nappe of undated granite, migmatite, gneiss, augen gneiss, amphibolite, and mica schist overlain by Triassic to Jurassic limestone and shale, Jurassic ophiolite, Cretaceous limestone, and Maestrichtian (upper Cretaceous) flysch. Two episodes of metamorphism are present: an older epizonal to mesozonal one affecting all formations below the Jurassic ophiolite, and followed by migmatization; and a younger metamorphism of Alpine age and mesozonal to catazonal intensity affecting all formations below the Maestrichtian.</jats:p

Relations entre Danien et Montien a Mons

Abstract Epeirogenic cycle, three faunal zones of ostracods, Ciply Beds covered by Ghlin Beds, Obourg Beds</jats:p

The Food and feeding relationships of Snapper (Chrysophrys auratus) and some other fish-species trawled in Hauraki Gulf

Feeding is examined in the eight most common demersal fish species taken by trawling in Hauraki Gulf. 1571 alimentary samples were used. The food table for each fish species is based on occurrence and on a modified points system of food analysis. All eight species feed on elements of the bottom fauna, with Crustacea the most important food group. Snapper (Chrysophrys auratus) is the most abundant fish - its abundance is probably explained by its greater diet diversity and smallest percentage of feeding overlap. Snapper feeding was studied temporally and spatially. Size of snapper, bottom, depth, time of day and geographical regions affected the occurrence and importance of food items, while season and sex did not. Analyses of food selection at specific stations showed that active interspecific competition was rarely present. Only for the three prey species, Hemiplax hirtipes. Tenagomysis macropsis and Amphiura sp., was slight competition noted