Las rocas ultrapotásicas plutónicas del NO de Vitigudino (Salamanca)caracterización y relación con las series shoshoníticas del Centro-Oeste Español

  1. F.J. López-Moro 1
  2. M. Iglesias Aguirre 1
  3. M. López-Plaza 1
  4. A. Castro 2
  5. J.I. García de los Ríos Cobo 3
  1. 1 Univ. de Salamanca
  2. 2 Instituto Andaluz de Ciencias de la Tierra
    info

    Instituto Andaluz de Ciencias de la Tierra

    Granada, España

    ROR https://ror.org/00v0g9w49

  3. 3 SIEMCALSA
Erakutsi afiliazioak +
Aldizkaria:
Geotemas (Madrid)

ISSN: 1576-5172

Argitalpen urtea: 2021

Zenbakien izenburua: X Congreso Geológico de España

Zenbakia: 18

Orrialdeak: 432-435

Mota: Artikulua

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Beste argitalpen batzuk: Geotemas (Madrid)

Laburpena

The ultrapotassic rocks from the NW of Vitigudino (Salamanca) are revealed attending to mineralogical and geo- chemical (major elements) criteria. Two subtypes or facies of rocks are distinguished: a) pyroxenic facies, with predominance of pyroxene and biotite over amphibole, and b) amphibolic facies, with inverse proportions. The variability in plagioclase relative to alkali feldspar ratio leads to an abundance of melanomonzonites in the amphibole facies, while alkali feldspar melanosienites and melanosienites are predominant in the pyroxenic facies. It is remarkable in both subtypes the abundance of apatite, allanite, titanite and epidote, justifying the markedly rich phosphorus contents (up to ca. 3 %), besides the expec- ted richness in REE. The mineralogical and geochemical composition of the ultrapotassic rocks is compared with that of the spatially associated monzonitic and vaugneritic series. The potassic character increases from vaugnerites and monzonites up to ultrapotassic rocks, strongly suggesting the K-enrichment is primary as it is coupled to an increase of the magnesium/ iron ratio.

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