The host rock here is a carbonate alteration and auriferous silicification.
2.
The facies are glauconitic with some horizons of silicification.
3.
Other post-depositional alteration includes pyritization, silicification, and alteration of titanium minerals.
4.
These are exposed in an erosional window of Lower Volcanic Series ( LVS ) andesite kaolinitization, silicification, and pyritization.
5.
The dolomite and limestone within the Bass formation have been affected by post-depositional alteration including : stylolitization, and silicification.
6.
Charles Walcott, the discoverer of the Burgess Shale on 30 August 1909, hypothesised that the organic material was preserved by silicification.
7.
Pyritization is a process similar to silicification, but instead involves the deposition of iron and sulfur in the pores and cavities of an organism.
8.
Silicification is quite common in the biological world and occurs in bacteria, single-celled organisms, plants, and animals ( invertebrates and vertebrates ).
9.
The ideal reactions involve the magnesium endmember components of the olivine ( reaction 1 ) or serpentine ( reaction 2 ), the latter derived from earlier olivine by hydration and silicification ( reaction 3 ).
10.
Much discussion has taken place regarding the origin of these spheroids, but it is generally admitted that most of them were originally spherulites, and that they have suffered extensive changes through decomposition and silicification.
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