The petrogenesis of quartz-diorites from the Tatra Mountains (Central Western Carpathians): an example of magma hybridisation

Gawęda, Aleksandra; Doniecki, Tomasz; Burda, Jolanta; Kohút, Milan

doi:10.1127/0077-7757/2005/0181-0005

Cited by 15 publications

(34 citation statements)

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“…The tabular syntectonic granitoid pluton is composed of several magma batches that differ in chemistry. In the Western Tatra Mts., an EarlyVariscan hybridization episode is imprinted on I-type quartzdiorite precursors, occurring as sills in the metamorphic envelope and at the bottom of a granodiorite-tonalite intrusion (Gawęda et al 2005). The mingling-mixing processes between the granodioritic common Tatra type and quartzdiorite precursors were dated at 368±8 Ma by zircon U-Pb method (Burda et al 2011).…”

Section: Geological Settingmentioning

confidence: 99%

“…1b and 2). In this profile, the 2-5 m thick horizons of granitic rocks extremely enriched in apatite occur above a mixingmingling zone of granite and diorite -quartz-diorite (mafic precursors; Gawęda et al 2005;Burda et al 2011). The profile comprises a lowermost Zone 1 of diorite -quartzdiorite, showing transitional contact to an intermediate Zone 2 of granitoid rocks characterized by magma mingling textures, dated at 368 Ma by zircon U-Pb method (Burda et al 2011), a cumulative apatite-enriched rocks in Zone 3, showing sharp contacts to Zone 2 and transitional contact with the uppermost Zone 4, comprising equigranular monzogranite and pophyritic K-feldspar-rich granite, locally with metapelitic xenoliths (Fig.…”

Section: Samplingmentioning

confidence: 99%

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The petrogenesis of granitoid rocks unusually rich in apatite in the Western Tatra Mts. (S-Poland, Western Carpathians)

et al. 2013

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In the bottom part of the tongue-shaped, layered granitoid intrusion, exposed in the Western Tatra Mts., apatite-rich granitic rocks occur as pseudo-layers and pockets between I-type hybrid mafic precursors and homogeneous S-type felsic granitoids. The apatite-rich rocks are peraluminous (ASI01.12-1.61), with P 2 O 5 contents ranging from 0.05 to 3.41 wt.% (<7.5 vol.% apatite), shoshonitic to high-K calcalkaline. Apatite is present as long-prismatic zoned crystals (Ap 1 ) and as large xenomorphic unzoned crystals (Ap 2 ). Ap 1 apatite and biotite represent an early cumulate. Feldspar and Ap 2 textural relations may reflect the interaction of the crystal faces of both minerals and support a model based on local saturation of (P, Ca, F) versus (K, Na, Al, Si, Ba) in the border zones. Chondrite-normalized REE patterns for the apatite rocks and for pure apatite suggest apatite was a main REE carrier in these rocks. Minerals characteristics and the whole rock chemistry suggest both reduced S-type and I-type magma influenced the apatite-rich rocks. The field observations, mineral and rock chemistry as well as mass-balance calculations point out that the presence of apatite-rich rocks may be linked to the continuous mixing of felsic and mafic magmas, creating unique phosphorus-and aluminium-rich magma portions. Formation of these rocks was initially dominated by the complex flowagecontrolled and to some extent also gravity-driven separation of early-formed zoned minerals and, subsequently, by local saturation in the border zones of growing feldspar and apatite crystals. Slow diffusion in the phosphorus-rich magma pockets favoured the local saturation and simultaneous crystallization of apatite and feldspars in a crystal-ladden melt.

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Section: Geological Settingmentioning

confidence: 99%

Section: Samplingmentioning

confidence: 99%

The petrogenesis of granitoid rocks unusually rich in apatite in the Western Tatra Mts. (S-Poland, Western Carpathians)

et al. 2013

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“…8). Given that the calibrated pressure for different parts of the Tatra granite Pluton was 4.5-6 kbar (Ludhová and Janák 1999;Gawęda et al 2005;Gawęda 2009;Burda et al 2011;Gawęda and Szopa 2011), it could have exceeded the lithostatic pressure, favouring hydrofracturing of the internal pegmatitic components as well as of the host granite. Crystallization inside the distant fracture zones (T2), calibrated for the unzoned, syntectonic muscovite (Fig.…”

Section: Crystallization Conditionsmentioning

confidence: 99%

“…The tongue-shaped Tatra granitoid intrusion (Kohút and Janák 1994) consists of several magmatic pulses, all dated by the U-Pb method on zircon: I-type mingled hybrid quartz diorite, interpreted as a mafic precursor and dated at 368 ± 8 Ma, tonalite-granodiorite showing an age interval of 360-370 Ma, syenogranite-monzogranite, locally porphyritic, rich in xenoliths and mafic microgranular enclaves, dated from 350 ± 5 Ma to 337 ± 6 Ma (Poller et al 2000;Gawęda et al 2005;Gawęda 2008Gawęda , 2009Burda et al 2011Burda et al , 2013. Formerly, these granites were dated at 314 ± 4 Ma (Poller and Todt 2000) but this age was later interpreted as to be influenced by the Pb-loss caused by post-magmatic shearing (Gawęda 2009).…”

Section: Geological Settingmentioning

confidence: 99%

Age and origin of the tourmaline-rich hydraulic breccias in the Tatra Granite, Western Carpathians

Gawęda¹,

Müller²,

Stein³

et al. 2013

J. Geosci.

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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 ºC in the case of the T1 brecciated pegmatites to 2.5-1.5 kbar and 465-430 ºC in the vein T2 breccias.

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“…The common Tatra granodioritetonalite forms a volumetrically predominant tongueshaped intrusion, dated at 368-350 Ma . Quartz-diorites (I-type mingled hybrid, interpreted as magmatic precursors) are present as sills inside the metamorphic envelope and in the border zone of the common Tatra granite (Gawęda et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

U-Pb zircon age of the youngest magmatic activity in the High Tatra granites (Central Western Carpathians)

2013

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Detailed cathodoluminescence (CL) imaging of zircon crystals, coupled with Laser Ablation Multi-Collector Inductively Coupled Plasma Mass Spectrometry (LA-MC-ICP-MS) U-Pb zircon dating was used to develop new insights into the evolution of granitoids from the High Tatra Mountains. The zircon U-Pb results show two distinct age groups (350±5 Ma and 337±6 Ma) recorded from cores and rims domains, respectively. Obtained results point that the last magmatic activity in the Tatra granitoid intrusion occurred at ca. 330 Ma. The previously suggested age of 314 Ma reflects rather the hydrothermal activity and Pb-loss, coupled with post-magmatic shearing.

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The petrogenesis of quartz-diorites from the Tatra Mountains (Central Western Carpathians): an example of magma hybridisation

Cited by 15 publications

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The petrogenesis of granitoid rocks unusually rich in apatite in the Western Tatra Mts. (S-Poland, Western Carpathians)

The petrogenesis of granitoid rocks unusually rich in apatite in the Western Tatra Mts. (S-Poland, Western Carpathians)

Age and origin of the tourmaline-rich hydraulic breccias in the Tatra Granite, Western Carpathians

U-Pb zircon age of the youngest magmatic activity in the High Tatra granites (Central Western Carpathians)

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