Age and origin of the tourmaline-rich hydraulic breccias in the Tatra Granite, Western Carpathians
PBN-AR
Instytucja
Wydział Matematyki, Fizyki i Chemii (Uniwersytet Śląski w Katowicach)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
Journal of Geosciences
ISSN
1802-6222
EISSN
Wydawca
CESKA GEOLOGICKA SPOLECNOST
DOI
URL
Rok publikacji
2013
Numer zeszytu
2
Strony od-do
133-148
Numer tomu
58
Identyfikator DOI
Liczba arkuszy
0,8
Autorzy
(liczba autorów: 5)
Pozostali autorzy
+ 4
Słowa kluczowe
EN
hydraulic breccias
quartz chemistry
Re-Os molybdenite dating
Tatra Mountains
Tourmaline
Streszczenia
Język
angielski
Treść
In the crystalline basement of the Tatra Mountains (Poland/Slovakia) two types of tourmaline-rich breccia zones are described, both having originated from magmatic fluids and showing a 350 +/- 1 Ma Re-Os model age. Both T1 brecciated pegmatites and T2 vein-breccias are cemented by a tourmaline-quartz matrix. In T1 breccias, the metasomatic replacement of feldspars by tourmaline and overgrowths of small Tur(2) tourmalines on the primary pegmatitic Tur(1) tourmaline crystals suggest an important role for metasomatic processes. The microcrystalline nature of the quartz-tourmaline matrix and high vacancy ratios in the X-site in tourmaline from T2 breccias reflect relatively rapid crystallization from an oxidized fluid. The formation of both types of breccias is related to the internal structure of the Tatra granitoid intrusion. The layered character of the granitoid body probably stimulated the formation of pegmatite-like pockets, with local overpressure causing metasomatic alteration, rock brecciation and cementation by tourmaline (T1 breccias), the final hydrofracturing of overburden rocks and fluid escape. The resulting fracture zones (T2) are interpreted as the paths for fluid migration and rapid crystallization as the pressure and temperature dropped from 7.5-6 kbar and 630-570 degrees C in the case of the T1 brecciated pegmatites to 2.5-1.5 kbar and 465-430 degrees C in the vein T2 breccias.
Inne
System-identifier
0192500104235
CrossrefMetadata from Crossref logo
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