Pb 210 dating sediments

Double flood basalts and plume head separation at the 660 kilometer discontinuity, Science, 266, 1367-1369.

pb 210 dating sediments-39

Mineralisation within the Central African Copperbelt is hosted within the Neoproterozoic Katanga Supergroup, an intracontinental rift basin sequence, comprising the Roan, Nguba and Kundelungu groups.

A period of extension commenced after ~900 Ma, and in Zambia, the sedimentary sequence began after 880 Ma, with the Lower Roan Subgroup oxidised rift facies clastic rocks, deposited in a series of restricted sub-basins controlled by extensional normal faults, including the thin reduced argillites of the Copperbelt Orebody Member near the middle of the unit.

Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.

There are over forty such techniques, each using a different radioactive element or a different way of measuring them.

The uppermost of the three Roan Group units in the DRC is the Dipeta Subgroup, comprising a lower regressive suite, including oxidised, evaporitic rocks, followed by transgressive carbonate rocks with some reduced intervals.

During deposition of the late Upper Roan and Dipeta subgroups, a period of 'renewed extension' commenced, reflected by a ~30 to 100 km wide by ~500 km long corridor of gabbroic and lesser felsic intrusions, and an associated volcanic belt of thin mafic lavas and tuffs emplaced from ~765 to 735 Ma. "Human Remains from the Pleistocene-Holocene Transition of Southwest China Suggest a Complex Evolutionary History for East Asians." PLo S ONE 7, no. Breakup and early seafloor spreading between India and Antarctica Gaina, Carmen, R. Signals of Barremian (116 Ma) or younger oceanic crust beneath the Bay of Bengal along 14N latitude between 81E and 93E, Mar. Bernard, A., Munschy, M., Rotstein, Y.&Sauter, D., 2005. Borissova, I., Moore, A., Sayers, J., Parums, R., Coffin, M. Geological framework of the Kerguelen Plateau and adjacent ocean basins, Geoscience Australia Record 2002/05. For most human activities involving minerals and raw materials, the levels of exposure to these radionuclides are not significantly greater than normal background levels and are not of concern for radiation protection.

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