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doi:10.1016/j.gca.2005.02.035 Coupling of anatectic reactions and dissolution of accessory phases and the Sr and Nd
 

Summary: doi:10.1016/j.gca.2005.02.035
Coupling of anatectic reactions and dissolution of accessory phases and the Sr and Nd
isotope systematics of anatectic melts from a metasedimentary source
LINGSEN ZENG,* PAUL D. ASIMOW, and JASON B. SALEEBY
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
(Received September 22, 2004; accepted in revised form February 25, 2005)
Abstract--Advances in field observations and experimental petrology on anatectic products have motivated
us to investigate the geochemical consequences of accessory mineral dissolution and nonmodal partial melting
processes. Incorporation of apatite and monazite dissolution into a muscovite dehydration melting model
allows us to examine the coupling of the Rb-Sr and Sm-Nd isotope systems in anatectic melts from a
muscovite-bearing metasedimentary source. Modeling results show that (1) the Sm/Nd ratios and Nd isotopic
compositions of the melts depend on the amount of apatite and monazite dissolved into the melt, and (2) the
relative proportion of micas (muscovite and biotite) and feldspars (plagioclase and K-feldspar) that enter the
melt is a key parameter determining the Rb/Sr and 87
Sr/86
Sr ratios of the melt. Furthermore, these two factors
are not, in practice, independent. In general, nonmodal partial melting of a pelitic source results in melts
following one of two paths in Nd-87
Sr/86
Sr ratio space. A higher temperature, fluid-absent path (Path 1)

  

Source: Asimow, Paul D. - Division of Geological and Planetary Sciences, California Institute of Technology,

 

Collections: Geosciences