Petrography, Mineralogy, and Origin of the Syenite Pegmatitic Segregation Veins from La PeNa Alkaline Complex, Mendoza, Argentina
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F16%3A00111386" target="_blank" >RIV/00216224:14310/16:00111386 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3749/canmin.1600015" target="_blank" >https://doi.org/10.3749/canmin.1600015</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3749/canmin.1600015" target="_blank" >10.3749/canmin.1600015</a>
Alternative languages
Result language
angličtina
Original language name
Petrography, Mineralogy, and Origin of the Syenite Pegmatitic Segregation Veins from La PeNa Alkaline Complex, Mendoza, Argentina
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10504 - Mineralogy
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Canadian Mineralogist
ISSN
0008-4476
e-ISSN
1499-1276
Volume of the periodical
54
Issue of the periodical within the volume
4
Country of publishing house
CA - CANADA
Number of pages
23
Pages from-to
803-825
UT code for WoS article
000402273000002
EID of the result in the Scopus database
2-s2.0-85019733590