Rb–sr geochronology (Igneous rocks)
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Rb–sr geochronology (Igneous rocks). / Waight, Tod.
Encyclopedia of Earth Sciences Series. Springer Netherlands, 2015. p. 698-702 (Encyclopedia of Earth Sciences Series).Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review
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TY - CHAP
T1 - Rb–sr geochronology (Igneous rocks)
AU - Waight, Tod
PY - 2015
Y1 - 2015
N2 - The preferential incorporation of Rb (following K) or Sr (following Ca) into different mineral structures, as well as their differing behaviors during closed system evolution of magmas by fractional crystallization, results in a wide range in Rb/Sr in mineral and whole rock compositions. The radioactive decay of87Rb to87Sr can then be exploited to generate an isochron and yield age information about a magmatic system, providing all the analyzed materials crystallized from a homogeneous parental melt, and the system has not been subsequently thermally or chemically disturbed. Some caution is required when applying the Rb–Sr chronometer to igneous systems; evaluation of the mobility of elements (especially Rb) and whether the strontium isotopic composition has been compromised by fluids (e.g., hydrothermal alteration and weathering) is required and the consequences of the relatively low closure temperature for Sr diffusion in many minerals, especially biotite, must be considered.
AB - The preferential incorporation of Rb (following K) or Sr (following Ca) into different mineral structures, as well as their differing behaviors during closed system evolution of magmas by fractional crystallization, results in a wide range in Rb/Sr in mineral and whole rock compositions. The radioactive decay of87Rb to87Sr can then be exploited to generate an isochron and yield age information about a magmatic system, providing all the analyzed materials crystallized from a homogeneous parental melt, and the system has not been subsequently thermally or chemically disturbed. Some caution is required when applying the Rb–Sr chronometer to igneous systems; evaluation of the mobility of elements (especially Rb) and whether the strontium isotopic composition has been compromised by fluids (e.g., hydrothermal alteration and weathering) is required and the consequences of the relatively low closure temperature for Sr diffusion in many minerals, especially biotite, must be considered.
M3 - Book chapter
AN - SCOPUS:85052375218
T3 - Encyclopedia of Earth Sciences Series
SP - 698
EP - 702
BT - Encyclopedia of Earth Sciences Series
PB - Springer Netherlands
ER -
ID: 208729190