Zircon U-Pb Dating of Magmatism and Mineralizing Hydrothermal Activity in the Variscan Karkonosze Massif and Its Eastern Metamorphic Cover (SW Poland)
SHRIMP (Sensitive high resolution ion microprobe) zircon U-Pb dating of the two main igneous rocks types in the Karkonosze Pluton, porphyritic and equigranular monzogranite, yield <sup>206</sup>Pb/<sup>238</sup>U ages between 312.0 ± 2.9 and 306.9 ± 3.0 Ma. These coincide, wi...
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MDPI AG
2020-09-01
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| author | Stanisław Z. Mikulski Ian S. Williams Holly J. Stein Jan Wierchowiec |
| author_facet | Stanisław Z. Mikulski Ian S. Williams Holly J. Stein Jan Wierchowiec |
| author_sort | Stanisław Z. Mikulski |
| collection | DOAJ |
| description | SHRIMP (Sensitive high resolution ion microprobe) zircon U-Pb dating of the two main igneous rocks types in the Karkonosze Pluton, porphyritic and equigranular monzogranite, yield <sup>206</sup>Pb/<sup>238</sup>U ages between 312.0 ± 2.9 and 306.9 ± 3.0 Ma. These coincide, within uncertainty, with the majority of previous dates from the pluton, which indicate development of the main magmatic processes between ca. 315 and 303 Ma. They also coincide with molybdenite and sulfide Re-Os ages from ore deposits developed during magmatic and pneumatolitic-hydrothermal (e.g., Szklarska Poręba Huta and Michałowice) or/and metasomatic and hydrothermal (e.g., Kowary, Czarnów and Miedzianka) processes forming Mo-W-Sn-Fe-Cu-As-REE-Y-Nb-Th-U mineralization. The <sup>206</sup>Pb/<sup>238</sup>U zircon age of 300.7 ± 2.4 Ma from a rhyolite porphyry dyke (with disseminated base metal sulfide mineralization) in the Miedzianka Cu-(U) deposit coincides with the development of regional tectonic processes along the Intra-Sudetic Fault. Moreover, at the end-Carboniferous, transition from a collisional to within-plate tectonic setting in the central part of the European Variscides introduced volcanism in the Intra-Sudetic Basin. Together, these processes produced brecciation of older ore mineralization, as well as metal remobilization and deposition of younger medium- and low-temperature hydrothermal mineralization (mainly Cu-Fe-Zn-Pb-Ag-Au-Bi-Se, and Th-U), which became superimposed on earlier high-temperature Mo-W-Sn- Fe-As-Cu-REE mineralization. A few <sup>206</sup>Pb/<sup>238</sup>U ages > 320 Ma remain to be reconciled, but might be due to the high U and Th contents of the zircon and the strong influence of overprinting pneumatolitic-hydrothermal processes. |
| first_indexed | 2024-03-10T16:30:54Z |
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| language | English |
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| spelling | doaj.art-9eaaca06346d4552af557114508a71562023-11-20T12:50:09ZengMDPI AGMinerals2075-163X2020-09-0110978710.3390/min10090787Zircon U-Pb Dating of Magmatism and Mineralizing Hydrothermal Activity in the Variscan Karkonosze Massif and Its Eastern Metamorphic Cover (SW Poland)Stanisław Z. Mikulski0Ian S. Williams1Holly J. Stein2Jan Wierchowiec3Polish Geological Institute-National Research Institute, Rakowiecka 4, 00-975 Warszawa, PolandResearch School of Earth Sciences, Australian National University, Canberra, ACT 2600, AustraliaAIRIE Program, Colorado State University, Fort Collins, CO 80523-1482, USAFaculty Geology, Warsaw University, Żwirki i Wigury 93, 02-089 Warszawa, PolandSHRIMP (Sensitive high resolution ion microprobe) zircon U-Pb dating of the two main igneous rocks types in the Karkonosze Pluton, porphyritic and equigranular monzogranite, yield <sup>206</sup>Pb/<sup>238</sup>U ages between 312.0 ± 2.9 and 306.9 ± 3.0 Ma. These coincide, within uncertainty, with the majority of previous dates from the pluton, which indicate development of the main magmatic processes between ca. 315 and 303 Ma. They also coincide with molybdenite and sulfide Re-Os ages from ore deposits developed during magmatic and pneumatolitic-hydrothermal (e.g., Szklarska Poręba Huta and Michałowice) or/and metasomatic and hydrothermal (e.g., Kowary, Czarnów and Miedzianka) processes forming Mo-W-Sn-Fe-Cu-As-REE-Y-Nb-Th-U mineralization. The <sup>206</sup>Pb/<sup>238</sup>U zircon age of 300.7 ± 2.4 Ma from a rhyolite porphyry dyke (with disseminated base metal sulfide mineralization) in the Miedzianka Cu-(U) deposit coincides with the development of regional tectonic processes along the Intra-Sudetic Fault. Moreover, at the end-Carboniferous, transition from a collisional to within-plate tectonic setting in the central part of the European Variscides introduced volcanism in the Intra-Sudetic Basin. Together, these processes produced brecciation of older ore mineralization, as well as metal remobilization and deposition of younger medium- and low-temperature hydrothermal mineralization (mainly Cu-Fe-Zn-Pb-Ag-Au-Bi-Se, and Th-U), which became superimposed on earlier high-temperature Mo-W-Sn- Fe-As-Cu-REE mineralization. A few <sup>206</sup>Pb/<sup>238</sup>U ages > 320 Ma remain to be reconciled, but might be due to the high U and Th contents of the zircon and the strong influence of overprinting pneumatolitic-hydrothermal processes.https://www.mdpi.com/2075-163X/10/9/787Variscan magmatismSHRIMP U-Pb zircon geochronologyRe-Os geochronologyintrusion related Mo-W-Sn- Fe-Cu-As-REE-Th-U mineralizationKarkonosze PlutonSudetes |
| spellingShingle | Stanisław Z. Mikulski Ian S. Williams Holly J. Stein Jan Wierchowiec Zircon U-Pb Dating of Magmatism and Mineralizing Hydrothermal Activity in the Variscan Karkonosze Massif and Its Eastern Metamorphic Cover (SW Poland) Minerals Variscan magmatism SHRIMP U-Pb zircon geochronology Re-Os geochronology intrusion related Mo-W-Sn- Fe-Cu-As-REE-Th-U mineralization Karkonosze Pluton Sudetes |
| title | Zircon U-Pb Dating of Magmatism and Mineralizing Hydrothermal Activity in the Variscan Karkonosze Massif and Its Eastern Metamorphic Cover (SW Poland) |
| title_full | Zircon U-Pb Dating of Magmatism and Mineralizing Hydrothermal Activity in the Variscan Karkonosze Massif and Its Eastern Metamorphic Cover (SW Poland) |
| title_fullStr | Zircon U-Pb Dating of Magmatism and Mineralizing Hydrothermal Activity in the Variscan Karkonosze Massif and Its Eastern Metamorphic Cover (SW Poland) |
| title_full_unstemmed | Zircon U-Pb Dating of Magmatism and Mineralizing Hydrothermal Activity in the Variscan Karkonosze Massif and Its Eastern Metamorphic Cover (SW Poland) |
| title_short | Zircon U-Pb Dating of Magmatism and Mineralizing Hydrothermal Activity in the Variscan Karkonosze Massif and Its Eastern Metamorphic Cover (SW Poland) |
| title_sort | zircon u pb dating of magmatism and mineralizing hydrothermal activity in the variscan karkonosze massif and its eastern metamorphic cover sw poland |
| topic | Variscan magmatism SHRIMP U-Pb zircon geochronology Re-Os geochronology intrusion related Mo-W-Sn- Fe-Cu-As-REE-Th-U mineralization Karkonosze Pluton Sudetes |
| url | https://www.mdpi.com/2075-163X/10/9/787 |
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