(Table 2) Fission track ages of apatite and sphene from Paleogene sediments at DSDP Hole 81-555 ...

Fission track ages of individual crystals of detrital apatite and sphene separated from early Eocene and Paleocene sandstones at Site 555 indicate the contribution of detritus from source rocks of at least three distinct age groups. A major group of Tertiary (56 ± 3 m.y.) apatite ages is compatible...

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Bibliographic Details
Main Authors: Duddy, I R, Gleadow, A J W, Keene, John B
Format: Dataset
Language:English
Published: PANGAEA 1984
Subjects:
Sample code/label
Sample code/label 2
Depth, top/min
Depth, bottom/max
DEPTH, sediment/rock
Sample, optional label/labor no
Mineral name
Grains, counted/analyzed
Parameter
Number
Fission-tracks
Fission-tracks, induced, density
Coefficient
Age, dated
Age, dated standard deviation
Uranium
Drilling/drill rig
DSDP/ODP/IODP sample designation
Calculated
Leg81
Glomar Challenger
Deep Sea Drilling Project DSDP
Greenland
Online Access:https://dx.doi.org/10.1594/pangaea.806942
https://doi.pangaea.de/10.1594/PANGAEA.806942
Description
Summary:Fission track ages of individual crystals of detrital apatite and sphene separated from early Eocene and Paleocene sandstones at Site 555 indicate the contribution of detritus from source rocks of at least three distinct age groups. A major group of Tertiary (56 ± 3 m.y.) apatite ages is compatible with either contemporaneous or near contemporaneous volcanism or rapid unroofing of high level intrusives like those identified previously on Rockall Island (Jones et al., 1972) and Greenland (Gleadow and Brooks, 1979). Cretaceous (100 ± 20 m.y.) apatite ages are consistent with known high level microgabbroic intrusives on Helen's Reef (Roberts et al., 1974). Such apatite ages could also be derived from basement rocks of very ancient terrains, especially around rifted continental margins where low level heating or uplift has affected the fission track ages of apatites (Gleadow, 1978). Minor contributions were also identified from a terrain with apatite ages around 150 to 200 m.y. Similar ages are known from ... : Sediment depth is given in mbsf. All track densities expressed as for internal surfaces. Neutron dosimetry for reference glass SRM612: B = 6.005 * 109 neutrons/track, Zeta = 360 ± 10. Equivalent to NBS Cu dosimetry via reference glass SRM962. ...

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