Diagenetic dissolution of magnetic minerals has been widely observed in organic-rich sediments from many environments. Organic-rich sediments from the eastern Mediterranean Sea (sapropels), recovered during Leg 160 of the Ocean Drilling Program, reveal a surprising catalogue of magnetic properties. Sapropels, from all sites studied across the eastern Mediterranean Sea, are strongly magnetic and...

The purpose of this study is to understand mineral diagenesis authigenic mineral and the effect of climate on mineral of Pleistocene-Holocene sediment deposits in the Southern Kenya Rift. Lake Magadi unique geologic settings are characterized by extreme alkalinity and high silica activities. The mineralogical analysis was achieved by X-Ray diffraction (XRD) and Scanning Electron Microscopy (SEM...

The Upper Cretaceous to Lower Paleocene Chalk Group in the North Sea comprises important reservoir targets for hydrocarbon and energy storage. quantitative impacts of mineralogy, chalk diagenesis oil saturation on petrophysics are often based general trends that cannot be directly applied engineering. present study aims at identifying quantitatively individual effects compaction cementation, po...

the qom formation, which hosts the mazraeh celestite deposit, contains dominantly limestones, marl and subordinate evaporites deposited in shallow marine environments. petrographic evidence indicates that the celestite deposits were formed by replacement of limestone. the presence of carbonate inclusions within celestite crystals as well as the pseudomorphic habits of some crystals suggests tha...

Diagenetic models for silt-rich mudstone (siltstone) are less advanced than those sandstone and clay-rich mudstone. In addition, the influences of diagenetic processes on reservoir quality in siltstone formations poorly understood. Here we examine roles depositional facies, detrital composition, compositional evolution Lower Triassic Montney Formation, a prominent siltstone-dominated western Ca...

Multiple episodes of dolomitization the shallow marine carbonates Late Kingriali Formation resulted in regional scale mappable dolostone geobodies Kohat and Potwar sub-basins. With exception few unaltered patches host limestone, more than 90% studied formation are diagenetically altered by replacive dolomites with associated dolomite cementation. Petrographical geochemical data interpretation r...

This paper presents the first study of Tl isotopes in early diagenetic pyrite. Measurements from two sections deposited during the Toarcian Ocean Anoxic Event (T-OAE, 183 Ma) are compared with data from Late Neogene (<10 Ma) pyrite samples from ODP legs 165 and 167 that were deposited in relatively oxic marine environments. The Tl isotope compositions of Late Neogene pyrites are all significant...

Reactive phosphorus undergoes diagenetic transformation once transferred into marine sediments. The degree of regeneration and redistribution of phosphorus depends on early diagenetic and environmental conditions, which may be linked to larger scale phenomena, such as bottom water circulation, water column ventilation, and organic carbon flux. Phosphorus phases of the 50m-sized fraction of deep...