(Table T1) Ages of white mica clasts in core samples of ODP Hole 210-1276A ...

• Main Authors: Wilson, R C L, Hiscott, Richard N
• Format: Dataset
• Language: English
• Published: PANGAEA 2007
• Subjects: Sample code/label; DEPTH, sediment/rock; Epoch; AGE; Age, dated; Age, dated standard deviation; Drilling/drill rig; Age model, biostratigraphy; Age, 40Ar/39Ar Argon-Argon; Leg210; Joides Resolution; Ocean Drilling Program ODP; Newfoundland
• Online Access: https://dx.doi.org/10.1594/pangaea.776711; https://doi.pangaea.de/10.1594/PANGAEA.776711

Fifty-seven white mica clasts were separated from five samples taken from near the bases of turbidites ranging in age from early Albian to middle Eocene. Twenty two (39%) of the micas have ages between 260 and 340 Ma and five (9%) have older ages (~400-600 Ma). The former age range is characteristic of the North American Alleghenian orogeny and the Iberian Variscan orogeny. The latter range is characteristic of the North American Acadian orogeny and older basement rocks in the Grand Banks and Newfoundland areas. Both age ranges are present in the middle Eocene sample, but only the younger range occurs in the middle Albian sample. This difference could be a sampling artifact. If this is not the case, then the most likely explanation is that the Acadian-aged micas within the Meguma Zone underlying the Grand Banks were totally reset by Alleghenian reactivation of the zone, a feature which occurs extensively in Nova Scotia. The addition of Acadian-aged micas in the middle Eocene sample may reflect a change in ... : Sediment depth is given in mbsf. AGE is age of sample from age-depth plot. ...