Shuanghe, Qianshan Co., Anqing Prefecture, Anhui Province, China

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Coesite-bearing titanite UHP paragneisses (intercalated with eclogites, marbles and jadeite quartzites) within the Dabie Shan - Sulu UHP metamorphic belt.
Located 2 km west of Shuanghe city and about 40 km WNW of Tongcheng.

UHP layered terranes, as a thrust slab, tectonically bounded, within granitic gneisses :
- Eclogites forming layers boudins and lenses in epidote two-micas schists or in marbles (north part of the slab).
- Carbonate eclogites forming nodules in marbles, strongly retrograded
- Layered eclogites intercalated with paragneisses
Late Archaean to Early Proterozoic protolith, peak metamorphism (230 Ma) (Journ. Geol. 109, 5, pp. 633-646) reached under the influence of highly salty fluids (meteoritic water trappedin basalt protoliths) (Acta Geologica Sinica, 2004, V 78, N°1, PP. 121-124).
- Marbles
- Jadeite quartzites forming layers in marbles, or layers between epidote two-micas schists and marbles.
Albitized sandstones derived from Archaean crust.
Peak metamorphism : 660 °C, > 2.6 kb.
- Epidote two-micas schists
- Amphibolites
- Garnet/biotite gneisses

References

- European Journal of Mineralogy 7, 119-138 (1995)
- Sassi, R., Harte, B., Carswell, D.A., and Yujing, H. (2000): Trace element distribution in Central Dabie eclogites. Contributions to Mineralogy and Petrology 139, 298-315.
- Luo Yan, Gao Shan, Yuan Honglin, Liu Xiaomin, Günther, D., Jin Zhenmin, and Sun Min (2004): Ce anomaly in minerals of eclogite and garnet pyroxenite from Dabie-Sulu ultrahigh pressure metamorphic belt: Tacking subducted sediment formed under oxidizing conditions. Science in China, Series D (Earth Sciences), 47(10), 920-930.

Mineral List

Aegirine-augite Albite var: Oligoclase 'Albite-Anorthite Series' 'Allanite' Almandine 'Apatite' Aragonite Barroisite

Biotite Calcite Coesite Diamond Diopside Dolomite var: Ferroan Dolomite Epidote 'Hornblende' Ilmenite

Jadeite 'K Feldspar' Kyanite 'Monalbite' ? 'Monazite' Omphacite Orthoclase Phengite Phlogopite

Quartz Rutile Spessartine Talc Taramite Titanite Zircon Zoisite

35 entries listed. 24 valid minerals.