Computer Science
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1045c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 8, pp.1045-1058
Computer Science
9
Scientific paper
The South Mountain batholith of southwestern Nova Scotia is a large, peraluminous, granodiorite-granite complex which intrudes mainly greenschist facies metasediments of the Cambro-Ordovician Meguma Group. Using Rb-Sr isochrons constructed from whole rocks and mineral separates, the present study shows a variation in age and initial ratios of the intrusive phases of the batholith as follows: biotite granodiorite (371.8 ± 2.2 Ma, ( 87 Sr / 86 Sr ) i ranges from 0.7076 ± 0.0003 to 0.7090 ± 0.0003, with the AVERAGE = 0.7081); adamellite (364.3 ± 1.3 Ma, ( 87 Sr / 86 Sr ) i = 0.70942 ± 35); porphyry (361.2 ± 1.4 Ma, ( 87 Sr / 86 Sr ) i = 0.71021 ± 119); using 87 Rb = 1.42 × 10 -11 yr -1 . A suite of Meguma country rock samples showed a variation of 87 Sr / 86 Sr = 0.7113-0.7177 at the time of intrusion of the batholith. A number of xenoliths of this material occurring in the marginal granodiorite had partially equilibrated isotopically with the granodiorite at a higher 87 Sr / 86 Sr ratio than elsewhere in the granodiorites. This evidence demonstrates that isotopic (and probably some accompanying bulk chemical) contamination by the Meguma rocks has been an important factor in determining the ultimate chemical composition and mineralogy of the South Mountain batholith. The ( 87 Sr / 86 Sr ) 372 = 0.7081 of the early granodiorites indicates that the parent magma of the South Mountain batholith was derived from a source unlike the Meguma Group. The precise nature of the source region cannot be determined by Rb-Sr work unless the degree of contamination with Megumalike material is known.
Clarke Bruce D.
Halliday Alex N.
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