The diagenetic fabric of the formation has been elucidated and on that basis paragenetic sequence
has been established.
Field observations and examinations of numerous specimens can be used to determine the paragenetic sequence
at Site I in the main mineralized zone (see Fig.
A paragenetic sequence
lists diagenetic processes in the chronological order that they affected the rocks under investigation.
Carrollite was deposited early in the paragenetic sequence
of the varied ore minerals present in the bornite pods, and it exhibits an especially interesting variety of replacement textures with respect to the subsequently deposited chalcopyrite and bornite.
The inferred paragenetic sequence
of the studied sandstone include both physical and chemical compaction, dissolution of feldspars and kaolinitization, chloritization and illitization ofsmectite, quartz overgrowth, calcite cementation and dolomitization, uplifting and deformational bands formation, and iron oxide/hydroxide cementation and its partial dissolution.
The progressive alteration in the fluid chemistry produced a paragenetic sequence
comparable to that illustrated by Schaller (1932): (1) saline period, (2) quartz period, (3) prehnite period, (4) zeolite period and (5) calcite period.
The perceived paragenetic sequence
in the Ametista geode is:
No individual deposit contains all of the minerals found in the general area, but the order of appearance of the minerals at each of the five deposits suggests that the general paragenetic sequence
is roughly the same throughout the area.
No euhedral crystals with these colors were recovered, and consequently their habit and position in the paragenetic sequence
From the simple observation that if mineral A overgrows mineral B, then mineral A was deposited after mineral B, the paragenetic sequence
of the minerals at the Van Silver deposit can be worked out.
The most prominent minerals at the Sweet Home mine have been placed into a paragenetic sequence
of formation based on their interrelationships as observed in hand specimens and their decreasing temperature of formation as measured by T.
They are typically lined with microcline, aegirine and natrolite, which are the earliest minerals in the paragenetic sequence