U pb dating of carbonates soluble

U pb dating of carbonates soluble

This would be consistent with meteoric water percolation during the Durancian exposure period. Vidal for the stable isotope analyses, and to H.

Vidal for the

Although most of these processes are thought to occur during early diagenesis, recent studies have shown that they could also take place later. If so, the U-Pb dating may be used. Have a look at the hexavalent and tetravalent ion of U and you will hardly see any chance for U to substitute for bivalent Ca in calcite at a considerable amount so as to be amenable for U-Pb dating.

Have a look at the hexavalent

There are a few examples where U is contained in calcareous rocks. Another option is the group of accessory minerals in limestones which are rather seldom excluding apatite. In this study we performed absolute U-Pb dating of calcite cements occurring in the Urgonian microporous limestone northern Tethys margin of southeastern France.

This would be consistent with

In particular, this event may be related to meteoric fluid circulations caused by the extensional regime during the western European rifting see Pisapia et al. This study illustrates the valuable information provided by absolute radiometric dating to better understand diagenetic processes and evolution of carbonate platforms. Anyway, it seems that in Precambrian limestone U em Pb are present. And therefor the age will be not true. One of the outcomes of this study is that metastable minerals remain unaltered from their deposition until the Durancian exposure i.

However, this is in line with several other studies Israelson et al. The problem with sediments is that if during diagenesis the sediment looses water it looses also some uranyl and, depending on the Pb present or not, the result will be a lie. Another problem is that the age is not of the sedimentation but the age of the diagenesis what can happen long time after sedimentation.

If so the

Whitaker, and an anonymous reviewer. Such cementation and stabilization processes are commonly invoked in formation of microporous reservoirs Volery et al. In any case, U-Pb may be used for dating Precambrin and newer sediments but care must be taken when interpreting the results.

Although most of these processesWhitaker and an anonymousSuch cementation and

In such deposits, assessing the exact timing of reservoir property stabilization is critical to better understand the postdepositional processes favorable to the creation or preservation of porosity. It seems that Precambrian limestones were formed like the newer ones.