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• W2555462371 abstract "The Connecting Point Group on the Bonavista Peninsula formed in one of the oldest marine basins known in the Avalon Terrane of Newfoundland. It comprises mainly resedimented pyroclastic and epiclastic rocks disposed in two turbidite-dominated sequences, separated by a regionally significant olistostrome. New U–Pb geochronological data are presented for zircon from four tuffaceous rock samples and help constrain the timing of depositional and tectonic processes. A 3-m-thick, crystal ash tuff from Eastport yielded an age of 610 ± 2 Ma, and constrains the minimum age of the stratigraphically underlying olistostrome. Approximately 32 km to the south-southeast, near Muddy Pond in the Sweet Bay area, a 1-cm-thick crystal ash tuff yielded a maximum age of 613 ± 3 Ma, which may represent the best estimate of the age of deposition of this tuff horizon. It is likely that this tuff represents the same stratigraphic unit as the tuff from Eastport. Both tuffs are concomitant with an influx of coarse volcanic debris, amalgamated sandstone and slump units, and the intrusion of synsedimentary diabase dykes and small mafic intrusions. This association is consistent with uplift of a volcanic source to the north, and associated seismicity triggering the formation of the regionally extensive olistostrome. At Southward Head in the Sweet Bay area, possible Bull Arm Formation-equivalent basalts having calc-alkaline-arc chemical signatures are interbedded with volcaniclastic red pebble conglomerate, and overlie tuffaceous and epiclastic rocks of the upper Connecting Point Group with angular unconformity. A lithic tuff, interbedded with thin-bedded, rippled sandstone of the upper Connecting Point Group, occurs below the unconformity, on the west side of Southward Head, and its age is best represented as 605 ± 2.2 Ma. Above the angular unconformity on the east side of Southward Head, a 2-m-thick crystal tuff, interbedded with volcaniclastic red pebble conglomerate, yielded a maximum age of 600 ± 3 Ma. These new geochronological results are interpreted to constrain the timing of uplift manifested by the unconformity at Southward Head to between 605 and 600 Ma. All three of the samples collected from the Sweet Bay area show significant inheritance, primarily of 630–610 Ma material, consistent with uplift of rocks of the underlying volcanic Love Cove Group, shedding volcanogenic and clastic material into the basin. The unconformity observed at Southward Head is interpreted to have formed in response to local uplift of a volcanic source in a dynamic and evolving, peri-continental, volcanic arc terrane." @default.
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• W2555462371 date "2016-01-01" @default.
• W2555462371 modified "2023-09-27" @default.
• W2555462371 title "NEW GEOCHRONOLOGICAL CONSTRAINTS ON THE CONNECTING POINT GROUP, BONAVISTA PENINSULA, AVALON ZONE, NEWFOUNDLAND" @default.
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