diagenetic การใช้

• Such mineralogical changes might equally be considered to be biostratinomic as diagenetic.
• The mineral occurs as interstitial grains in sandstone formed under diagenetic conditions.
• Later researchers have offered other explanations, from diagenetic gas bubbles to burrow traces.
• The chalk nodules which apparently replaced chalk and infilled pore spaces early in the diagenetic history.
• In sediments it occurs as authigenic, diagenetic minerals and as a product of hydrothermal deposition.
• The changes that occur during this diagenetic phase mainly relate to the reworking of the sediments.
• This causes the taphonomic or diagenetic obliteration of fossils, producing gaps and condensation of the record.
• Foliation may be formed by realignment of micas and diagenetic metamorphism and low-grade burial metamorphism.
• The general conditions leading to post-diagenetic alteration have been described by M點ke ( 1994 ).
• Porosity is controlled by : rock type, pore distribution, cementation, diagenetic history and composition.
• Compaction is, for example, an important diagenetic process in clay, which can initially consist of 60 % water.
• As a part of a sedimentary or metamorphic rock, fossils undergo the same diagenetic processes as does the containing rock.
• If the illite crystallinity is > 1.0, it corresponds with a metamorphic shallow diagenetic zone or zeolite facies.
• The effects of diagenetic recrystallization first must be accounted for, followed by analysis of lamination textures and deduction of possible accretion mechanisms.
• Illite crystallinity can be used to trace the low grade metamorphic transition from zeolite facies to greenschist facies ( diagenetic zone to epizone ).
• The growth types termed diagenetic and hydrogenetic reflect suboxic and oxic growth, which in turn could relate to periods of interglacial and glacial climate.
• The breccia consists of fragments of white to dark gray cherty material, quartz-rich sandstone, diagenetic cherty nodules, and 40Ar / 39Ar method.
• They are linked to the uplift, erosion and surface weathering of previously deposited sediments and require conditions similar to primary and diagenetic red beds for their formation.
• As such, isotopic analysis makes use of the more resistant phosphate groups, rather than the less abundant hydroxyl group or the more likely diagenetic carbonate groups present.
• If the illite crystallinity values fall in the 0.42-1.0 ?? range, it corresponds with a metamorphic deep diagenetic zone or zeolite facies.