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Blueschists in the Cretaceous exotic conglomerates of the Klape Unit (Pieniny Klippen Belt, Western Carpathians): their genetic types and implications for source area

Ivan P., Sykora M., Demko R.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2006

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T. 32, z. 1

47-63

EN

In the Klape Unit of the Pieniny Klippen Belt the Albian conglomerates with clasts of exotic carbonates, clastic sediments and also volcanic and plutonic rocks are relatively widespread. In the small area near the town Povażska Bystrica also scarce blueschist clasts of variegated petrographic types have been found. Three groups of starting rocks can be discerned for blueschists: pelagic sediments, metamorphic rocks (amphibolites, gneisses) and volcanic rocks. Based on immobile trace element (HFSE, REE) distribution two petrogenetic types of volcanic rocks have been identified: basalts with BABB signature and calc-alkaline basaltic andesites to rhyolites. Source of these rocks was probably a nappe stack located in the Carpathian interior and created in the Late Jurassic time as a result of subduction of the oceanic crust and adjacent volcanic arc and followed by collision during the Meliata Ocean closure

PL

Albskie zlepieńce jednostki klapskiej pienińskiego pasa skałkowego zawierające egzotyki skał węglanowych, klastycznych, jak również wulkanicznych i plutonicznych są szeroko rozprzestrzenione. Na małym obszarze w okolicy Povażskiej Bystricy (Słowacja zachodnia) w kilku stanowiskach znaleziono rzadkie egzotyki zróżnicowanych petrograficznie łupków glaukofanowych. Wyróżniono trzy grupy pierwotnych utworów przekształconych w te łupki: osady pelagiczne, skały metamorficzne (amfibolity, gnejsy) i skały wulkaniczne. W oparciu o niestabilne pierwiastki śladowe (HFSE, REE) zidentyfikowano dwa typy petrogenetyczne skał wulkanicznych: bazalty o cechach bazaltów obszarów zaułkowych (BABB) oraz wapniowo-alkaliczne andezyty i ryolity bazaltowe. Obszarem źródłowym tych skał były prawdopodobnie spłaszczowinowane jednostki zlokalizowane w obrębie Karpat wewnętrznych, powstałe w późnej jurze jako rezultat subdukcji skorupy oceanicznej i utworzonego w związku z tym łuku wulkanicznego, w następstwie kolizji podczas zamykania się oceanu Meliaty

2

Resedimentation processes of mass flow volcaniclastics from the rhyodacitic formation, Gutai Mountains, Romanian Eastern Carpathians

Fulop A.

Biuletyn Państwowego Instytutu Geologicznego

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2001

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nr 396

44-45

3

Geology of Volcanic Rocks (?Upper Cretaceous-Lower Tertiary) at Potter Peninsula, King George Island (South Shetland Islands, West Antarctica.

Birkenmajer K.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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1998

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Vol. 46, nr 2

147-155

EN

Stratiform basaltic/basaltic-andesite lavas (a minimum 50m thick), with red agglomerate and tuff interlayers (up to 10m thick), are the oldest rocks recognized at Potter Peninsula, King George Island (South Shetland Islands, West Antarctica). They resemble volcanic-volcaniclastic rocks of the Paradise Cove Group (King George Island Supergroup) from Admiralty Bay, King George Island, K-Ar-dated at Upper Cretaceous. Hypabyssal intrusions of basalt and andesite at Potter Peninsula represent two hases: (1) plugs and stills at Stranger Point are closely interrelated with the stratiform volcanic complex, and could be of Cretaceous age; (2) a large basalt (resp. hypersthene-augite andesite) plug of Three Brothers Hill, K-Ar-dated at Lower Tertiary, and two systems of vertical basaltic/andesitic dykes (Admiralty Bay Gp), cut the stratiform volcanic complex. The older dykes strike NW-SE. The younger dykes, striking NNE-SSW to N-S, often follow vertical Tertiary faults transversal to the island axis. These transversal faults cut also the Three Brothers Hill plug.

4

Geology of tertiary volcanic rocks at Turred Point and Mersey Spit, King George Island (South Shetland Islands, West Antarctica)

Birkenmajer K.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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1998

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Vol. 46, nr 3-4

223-234

EN

Three Lower Tertiary volcanic complexes occur at the Turred Point-Mersey Spit promotory on King George Island (South Shetland Islands, West Antarctica. The first complexis represented by a pile of thick andesitic-basaltic lava flows attributed to the Mazurek Point Formation. The second complex consist of andesite breccias which from vertical cutting the lavas. The third complex is represented by vertical andesite plugs and dykes cutting the lavas and the vent braccias.