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
Ref. Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138.
