10.1594/PANGAEA.705274
Strand, Kari O
Kari O
Strand
Passchier, Sandra
Sandra
Passchier
0000-0001-7204-7025
Näsi, Jari
Jari
Näsi
Quartz grain microtextures of sediments from ODP Hole 188-1166A (Table 1)
PANGAEA
2003
DEPTH, sediment/rock
Sample code/label
Quartz, surface texture
Drilling/drill rig
DSDP/ODP/IODP sample designation
Scanning electron microscope (SEM)
Leg188
Joides Resolution
Ocean Drilling Program (ODP)
2000-02-16T01:30:00/2000-02-21T16:00:00
en
Supplementary Dataset
10.1016/S0031-0182(03)00396-1
532 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
This paper presents the results of the scanning electron microscopic (SEM) analysis of quartz grains from a selection of samples at Site 1166. Ocean Drilling Program Leg 188 drilled Site 1166 on the Prydz Bay continental shelf, Antarctica, to document onset and fluctuations of East-Antarctic glaciation. This site recovered Upper Pliocene-Holocene glacial sediments directly above Cretaceous through Lower Oligocene sediments recording the transition from preglacial to early glacial conditions. SEM analysis of quartz grains at Site 1166 was used to characterize the glacial and preglacial sediments by their diagnostic textures. Angular edges, edge abrasion as well as arcuate to straight steps, are the most frequent features in glacial deposits. The highest frequency of grains with round edges is present in Middle-Late Eocene fluvio-deltaic sands. However, angular outlines, fractured plates with subparallel linear fractures and edge abrasion indicating glacier influence are also present. Preglacial carbonaceous mudstone and laminated gray claystone show distinctive high relief quartz grains and some chemical weathering on grain surfaces. The results of the microtextural analysis of quartz grains are used to verify some critical periods of ice sheet evolution, such as the transition from the East Antarctic preglacial to glacial conditions on the continental shelf from Middle/Late Eocene to Late Eocene/Early Oligocene time.
Supplement to: Strand, Kari O; Passchier, Sandra; Näsi, Jari (2003): Implications of quartz grain microtextures for onset Eocene/Oligocene glaciation in Prydz Bay, ODP Site 1166, Antarctica. Palaeogeography, Palaeoclimatology, Palaeoecology, 198(1-2), 101-111
74.78693
-67.69616
Prydz Bay