The SÃo Pedro do Sul Granite (Central Portugal): An HHP Th-rich Rock of the Hesperian Massif

L. J.P.F. Neves; W. E. Stephens; A. J.S.C. Pereira; M. M. Godinho; A. E. Fallick

The SÃo Pedro do Sul Granite (Central Portugal): An HHP Th-rich Rock of the Hesperian Massif

L. J.P.F. Neves^*, W. E. Stephens, A. J.S.C. Pereira, M. M. Godinho, A. E. Fallick

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

A high heat producing granite pluton has been investigated with the aims of quantifying the budget of heat producing elements and understanding its petrogenesis. The granite produces three times more heat than typical two-mica granites of this region (about 11.2 μWm^-3), due mainly to very high Th (average 120 ppm). The pluton has a high abundance of accessory phases and we model about 51 % of the Th to reside in monazite. the remainder probably present largely in thorite. Fission track methods indicate that U is also concentrated in accessory phases, and at least one major phase (probably K-feldspar). Actinide enrichment correlates well with enrichment in the REE and Zr, and we attribute this to the accumulation of accessory mineral phases, although the mechanism is not clear. Combined whole rock major oxide, trace element and oxygen isotope data for the São Pedro do Sul granite (central Portugal) indicate derivation of the parental magma from a metasedimentary source.

Original language	English
Journal	Anais da Academia Brasileira de Ciencias
Volume	71
Issue number	1
Publication status	Published - 1999

Keywords

Hhp granite
Th-rich, portugal

Cite this

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title = "The S{\~A}o Pedro do Sul Granite (Central Portugal): An HHP Th-rich Rock of the Hesperian Massif",

abstract = "A high heat producing granite pluton has been investigated with the aims of quantifying the budget of heat producing elements and understanding its petrogenesis. The granite produces three times more heat than typical two-mica granites of this region (about 11.2 μWm-3), due mainly to very high Th (average 120 ppm). The pluton has a high abundance of accessory phases and we model about 51 % of the Th to reside in monazite. the remainder probably present largely in thorite. Fission track methods indicate that U is also concentrated in accessory phases, and at least one major phase (probably K-feldspar). Actinide enrichment correlates well with enrichment in the REE and Zr, and we attribute this to the accumulation of accessory mineral phases, although the mechanism is not clear. Combined whole rock major oxide, trace element and oxygen isotope data for the S{\~a}o Pedro do Sul granite (central Portugal) indicate derivation of the parental magma from a metasedimentary source.",

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AU - Pereira, A. J.S.C.

AU - Godinho, M. M.

AU - Fallick, A. E.

PY - 1999

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AB - A high heat producing granite pluton has been investigated with the aims of quantifying the budget of heat producing elements and understanding its petrogenesis. The granite produces three times more heat than typical two-mica granites of this region (about 11.2 μWm-3), due mainly to very high Th (average 120 ppm). The pluton has a high abundance of accessory phases and we model about 51 % of the Th to reside in monazite. the remainder probably present largely in thorite. Fission track methods indicate that U is also concentrated in accessory phases, and at least one major phase (probably K-feldspar). Actinide enrichment correlates well with enrichment in the REE and Zr, and we attribute this to the accumulation of accessory mineral phases, although the mechanism is not clear. Combined whole rock major oxide, trace element and oxygen isotope data for the São Pedro do Sul granite (central Portugal) indicate derivation of the parental magma from a metasedimentary source.

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The SÃo Pedro do Sul Granite (Central Portugal): An HHP Th-rich Rock of the Hesperian Massif

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Keywords

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