paragenetic sequence

paragenetic sequence

[¦par·ə·jə′ned·ik ′sē·kwəns]
(mineralogy)
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The paragenetic sequence of different diagenetic stages is shown in table 1.
(a) = Basin boundary (b) = Sandstone (c) = Siltstone (d) = Argillaceous siltstone (e) Mudstone FIGURE 9: Paragenetic sequence of diagenesis in the Chang 8 sandstones in west Ordos basin.
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.
Step 1: facies analysis (including establishing the primary porosity and permeability distributions, and the "primary aquastratigraphy"--a term newly defined in this article); Step 2: petrographic analyses (paragenetic sequence, mapping amounts and spatial distribution of diagenetic phases); Step 3: geochemical analyses (isotopes, trace elements, fluid inclusions, etc.); Step 4: burial history and paleohydrology; Step 5: integration with extant data (especially petrophysical data), if available, and Step 6:modeling (not necessary, but desirable in at least some cases).
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 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 various diagenetic modifications in the studied Lower Cretaceous sequence and their paragenetic sequence is discussed as under (Fig.
The diagenetic fabric of the formation has been elucidated and on that basis paragenetic sequence has been established.
The positions of galena and barite in the paragenetic sequence could not be determined because they are not in contact with other minerals, except calcite.
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.