Publikationsdatum:
2011-07-01
Beschreibung:
Donghai County in the Jiangsu Province of East China is known for its large-scale production of high-quality quartz crystals. The quartz crystals are hosted within the Su-Lu ultrahigh-pressure (UHP) metamorphic belt. They form in quartz veins hosted by eclogite and gneiss, or along contacts between eclogite and gneiss and are mined as placer deposits in the Quaternary sediments. Backscattered electron imaging of the rutile in rutile-bearing euhedral quartz crystals from this region reveal three compositionally and texturally distinct generations of rutile, encapsulated within the host quartz crystal. The earliest generation of rutile (R1) is brightest in BSE, reflecting enrichment in Fe2O3 (0.75-2.08 wt%), Nb2O5 (0.37-0.93 wt%), WO3 (0.48-2.99 wt%), and ZrO2 (0.005-0.105 wt%), relative to R2 and R3. R2 rutile overgrows R1 rutile and contains 0.66-1.11 wt% Fe2O3, 0.45-0.74 wt% Nb2O5, 0.09-0.20 wt% WO3, and
Print ISSN:
0003-004X
Digitale ISSN:
1945-3027
Thema:
Geologie und Paläontologie
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