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@article{1581457,
author = {Pagano, Diego Sebastian and Galliski, Miguel Angel and MárquezandZavalía, Maria Florencia and Novák, Milan and Škoda, Radek},
article_location = {Quebec},
article_number = {4},
doi = {http://dx.doi.org/10.3749/canmin.1600015},
keywords = {pegmatitic segregation; malignite; potassic alkaline rocks; interstitial melt; La Pena complex; Mendoza; Argentina},
language = {eng},
issn = {0008-4476},
journal = {Canadian Mineralogist},
title = {Petrography, Mineralogy, and Origin of the Syenite Pegmatitic Segregation Veins from La PeNa Alkaline Complex, Mendoza, Argentina},
url = {https://doi.org/10.3749/canmin.1600015},
volume = {54},
year = {2016}
}
TY - JOUR
ID - 1581457
AU - Pagano, Diego Sebastian - Galliski, Miguel Angel - Márquez-Zavalía, Maria Florencia - Novák, Milan - Škoda, Radek
PY - 2016
TI - Petrography, Mineralogy, and Origin of the Syenite Pegmatitic Segregation Veins from La PeNa Alkaline Complex, Mendoza, Argentina
JF - Canadian Mineralogist
VL - 54
IS - 4
SP - 803-825
EP - 803-825
PB - Mineralogical Association of Canada
SN - 00084476
KW - pegmatitic segregation
KW - malignite
KW - potassic alkaline rocks
KW - interstitial melt
KW - La Pena complex
KW - Mendoza
KW - Argentina
UR - https://doi.org/10.3749/canmin.1600015
L2 - https://doi.org/10.3749/canmin.1600015
N2 - The syenite pegmatitic segregation veins (SPSV) of the Early Miocene La Pena alkaline complex (LPC), Mendoza, Argentina, are emplaced in a malignite body. They occur as veins, parallel layers, and small elliptical bodies 1 to 6 cm wide and 0.2 to 1 m in length. The veins with a pegmatitic to micropegmatitic texture have a thin dark border composed of andradite, potassic-hastingsite, and dark micas and a thicker internal zone of poikilitic Ba-Sr-poor K-feldspar (Or(90.3)Ab(8.9)An(0.8)), nepheline (Ne(74.9)Ks(19.4)Qz(5.7) to Ne(78.7)Ks(20.0)Qz(1.3)), potassic-hastingsite, dark mica, andradite, scarce clinopyroxene (diopside-hedenbergite), and locally zoned microphenocrysts of Ba-Sr-rich K-feldspar (Or(75.6)Ab(21.7)An(2.7)). Accessory fluorapatite, titanite, interstitial sodalite, and magnetite and secondary abundant Na- and K-rich zeolites, calcite, chlorite-group minerals, and possibly cancrinite have been identified. The textural and mineralogical characteristics of the SPSV show genetic links with the host malignite that belongs to the potassic alkaline series. The SPSV were formed from a residual syenitic melt (malignite) extracted from a parental tephritic magma. In the residual malignite, the concentration of primary crystals (apatite, clinopyroxene, Ba-Sr-rich K-feldspar, and nepheline) formed a crystal network (mush) with the open spaces occupied by small amounts of residual melt enriched in Al, Na, K, and volatiles and depleted in Ba and Sr. Deformation (by shear movements plus magmatic pressures) produced microfractures and fractures which were occupied by residual interstitial melt. In situ crystallization within these fractures resulted in the formation of the SPSV.
ER -
PAGANO, Diego Sebastian, Miguel Angel GALLISKI, Maria Florencia MÁRQUEZ-ZAVALÍA, Milan NOVÁK a Radek ŠKODA. Petrography, Mineralogy, and Origin of the Syenite Pegmatitic Segregation Veins from La PeNa Alkaline Complex, Mendoza, Argentina. \textit{Canadian Mineralogist}. Quebec: Mineralogical Association of Canada, 2016, roč.~54, č.~4, s.~803-825. ISSN~0008-4476. Dostupné z: https://dx.doi.org/10.3749/canmin.1600015.
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