Accessory Minerals in Felsic Igneous Rocks - Part 6: Composition of monazite-(Ce), xenotime-(Y) and zircon from the late-Variscan Fichtelgebirge/Smrčiny granites (Germany, Czech Republic)

Description: This data set is the sixth part of a series reporting chemical data for accessory minerals from felsic igneous rocks. It assembles the results of electron-microprobe spot analyses of monazite-(Ce), xenotime-(Y) and zircon from the late-Variscan granites of the Fichtelgebirge/Smrčiny in the Saxothuringian Zone of the Variscan Orogen in Germany/ Czech Republic.The granites form an older, Namurian intrusive complex (OIC-p and OIC-e) and a younger, post-Westphalian intrusive complex (YIC-1 and YIC-2). Both complexes have distinct radioactive accessory-mineral assemblages and compositions. The OIC-p biotite monzogranites contain monazite-(Ce) and minor thorite, but apparently lack magmatic xenotime-(Y) and uraninite. The more evolved OIC-e two-mica granites bear monazite-(Ce) occasionally rich in Th (up to 21 wt% ThO2) and U (8 wt% UO2), xenotime-(Y) of moderate U content (< 3.3 wt% UO2), and uraninite poor in Th and the REE. The most fractionated YIC Li-mica granites (YIC-2) may contain monazite extremely high in Th (40.5 wt% ThO2) and U (8.6 wt% UO2), which classify as cheralite-(Ce), xenotime-(Y) rich in U (6.3 wt% UO2) and such with elevated Y/Ho ratios (up to 48), and also a Th–REE-poor uraninite. In these granites, zircon may contain up to 5 wt% HfO2 and display low, fractionated Zr/Hf ratios (down to 10).The data set contains the complete pile of electron-microprobe analyses for monazite-(Ce) (MONA-FICH-2020), xenotime-(Y) (XENO-FICH-2020), and zircon (ZIRC-FICH-2020). All tables are presented as Excel (xlsx) and machine-readable txt formats. The content of the tables and further information on the granites and regional geology are provided in the data description file.

Global identifier:

Doi(
    "10.5880/GFZ.4.8.2020.002",
)

Origins: /Wissenschaft/Helmholtz-Gemeinschaft/GFZ

Tags: Fichtelgebirge ? Bär ? Zirkonium ? Tschechische Republik ? Kind ? Seltene Erden ? Chemikalien ? Daten ? Geologie ? EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > ELEMENTS ? EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > IGNEOUS ROCKS ? EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > MINERALS ? Namurian intrusive complex ? Saxothuringian Zone ? Variscan orogeny ? electron-microprobe analysis ? magma differentiation ? mineral composition ? monazite ? post-Westphalian intrusive complex ? xenotime ?

License: cc-by/4.0

Language: Englisch/English

Organisations

• GFZ Data Services (Herausgeber*in)

Issued: 2020-01-01

Time ranges: 2020-01-01 - 2020-01-01

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Aktiv

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