Journal
SEDIMENTOLOGY
Volume 60, Issue 2, Pages 631-634Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-3091.2012.01360.x
Keywords
Cap dolostone; Ediacaran; Marinoan; Namibia; stromatolite; tubestone
Categories
Ask authors/readers for more resources
Tectonic fold tests conducted in Namibia demonstrate that the inclination with respect to bedding of geoplumb (palaeovertical) tubular structures in the Marinoan (635Ma) syndeglacial cap dolostone is mainly the result of tectonic strain. Therefore, tubestone inclination data cannot be used to estimate the gradient of the sea floor on the foreslope of the Otavi carbonate platform during the Marinoan glaciation. A gradient steeper than 0 center dot 1 (slope angle ca 5 center dot 7 degrees), implying a glacial base-level fall 0 center dot 5km, is nevertheless supported by boulder-size intraclast debrite in the falling-stand wedge directly beneath the glacigenic sequence. Cryogenian oceans lacked skeletal carbonate production, raising the carbonate saturation state and persistent deep water anoxia excluded acid-producing aerobic respiration, facilitating early diagenetic carbonate precipitation, lithification and steep submarine slopes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available