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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

Ref.:
- 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
    (Na,Ca)(Fe
    3+
     
    		,Fe
    2+
     
    		,Mg,Al)Si
     
    2
    		O
     
    6
    Description: In retrograded eclogites : yellow-green Na/Ca-aegirine-augite rimming quartz (Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138. ]
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Description: Coesite-bearing titanite UHP paragneisses Inclusions in titanite. In jadeite quartzite : in matrix (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138)
    Reference: [Am. Min. , V 87, pp. 875-881, 2002.]
  		•  Albite
    var: Oligoclase
    (Na,Ca)[Al(Si,Al)Si
     
    2
    		O
     
    8
    		]
    Description: In retrograded eclogites (Eur. J. Mineral. , 1995, 7, pp. 119-138). In epidote two-micas schists : symplectites with amphibole after omphacite (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138. ]
  		•  'Albite-Anorthite Series'
    Description: Coesite-bearing titanite UHP paragneisses Retrogressed phase in eclogites and orthogneisses matrix. Shuanghe / Dabie Shan(Chemical Geology, 186, 2002, pp. 315-331). In garnet/biotite gneisses (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  'Allanite'
    Description: Coesite-bearing titanite UHP paragneisses Forms the core of titanite crystals.
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Almandine
    Fe
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
    Description: In fresh eclogites (Eur. J. Mineral. , 1995, 7, pp. 119-138). In garnet/biotite gneisses (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In jadeite quartzite : relictual, replaced by taramite, albite or aegirine (rimward) (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In epidote two-micas schists (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In layered eclogites intercalated with paragneisses.
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138. ]
  		•  'Apatite'
    Description: Coesite-bearing titanite UHP paragneisses. In layered eclogites intercalated with paragneisses.
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Aragonite
    CaCO
     
    3
    Description: Coesite-bearing titanite UHP paragneisses : inclusions in zircon and titanite.
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Barroisite
    ☐[CaNa][Mg
     
    3
    		AlFe
    3+
     
    		][(OH)
     
    2
    		|AlSi
     
    7
    		O
     
    22
    		]
    Description: In carbonate eclogites (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138. ]
  		•  Biotite
    Description: Retrogressed phase in eclogites and orthogneisses matrix. Shuanghe / Dabie Shan.(Chemical Geology, 186, 2002, pp. 315-331). In garnet/biotite gneisses (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In epidote two-micas schists (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Calcite
    CaCO
     
    3
    Description: Coesite-bearing titanite UHP paragneisses. In carbonate eclogites : associated with epidote(Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In marbles.
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Coesite
    SiO
     
    2
    Description: Coesite-bearing titanite UHP paragneisses : inclusions in zircon and titanite. UHP assemblage, with aragonite and jadeite. In eclogites.
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Diamond
    C
    Description: Shuanghe / Dabie Shan.
    Reference: [Chemical Geology, 186, 2002, pp. 315-331.]
  		•  Diopside
    CaMg[Si
     
    2
    		O
     
    6
    		]
    Reference: [Sassi, R., Harte, B., Carswell, D.A., and Yujing, H. (2000): Contributions to Mineralogy and Petrology 139, 298-315.]
  		•  Dolomite
    var: Ferroan Dolomite
    Description: In carbonate eclogites : relicts in calcite (Shanghue / Eur. J. Mineral. , 1995, 7, pp. 119-138). In marbles.
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138. ]
  		•  Epidote
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Description: Coesite-bearing titanite UHP paragneisses Complex crystals with allanite core, zoisite intermediate zone and epidote rim. In retrograded eclogites : replaces symplectites after omphacites (Eur. J. Mineral. , 1995, 7, pp. 119-138). In carbonate eclogites : associated with calcite(Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In garnet/biotite gneisses (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In marbles. In epidote two-micas schists (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  'Hornblende'
    Description: Coesite-bearing titanite UHP paragneisses. In retrograded eclogites (Eur. J. Mineral. , 1995, 7, pp. 119-138). In epidote two-micas schists (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Ilmenite
    Fe
    2+
     
    		TiO
     
    3
    Description: In retrograded eclogites : replaces rutile in matrix (Eur. J. Mineral. , 1995, 7, pp. 119-138). In garnet/biotite gneisses (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138. ]
  		•  Jadeite
    Na(Al,Fe
    3+
     
    		)[Si
     
    2
    		O
     
    6
    		]
    Description: Coesite-bearing titanite UHP paragneisses : Inclusions in zircon and titanite. In jadeite quartzite : porphyroblasts, rimmed (kelyphitic overgrowths) by oligoclase (inner rim) and albite (outer rim) + aegirine-augite (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138)
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  'K Feldspar'
    Description: In retrograded eclogites : intergrowths with K-feldpar, replacing phengite (Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138]
  		•  Kyanite
    Al
     
    2
    		[O|SiO
     
    4
    		]
    Description: In epidote two-micas schists (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In layered eclogites intercalated with paragneisses.
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138. ]
  		•  'Monalbite' ?
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Description: submicron-scale inclusions in jadeite
    Reference: [Earth and Planetary Science Letters, 222, 235-241(2004)]
  		•  'Monazite'
    Description: Recrystallization during retrograde metamorphism, Shuanghe / Dabie Shan. In jadeite quartzite (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [Chemical Geology, 186, 2002, pp. 315-331.]
  		•  Omphacite
    (Ca,Na)(Mg,Al)[Si
     
    2
    		O
     
    6
    		]
    Description: In fresh eclogites (Eur. J. Mineral. , 1995, 7, pp. 119-138). In retrograded eclogites : replaced by Ca-pyroxene or Ca-amphibole + Na-plagioclase symplectites (Eur. J. Mineral. , 1995, 7, pp. 119-138). In layered eclogites intercalated with paragneisses : rimmed by symplectite.
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138. ]
  		•  Orthoclase
    K[AlSi
     
    3
    		O
     
    8
    		]
    Description: Coesite-bearing titanite UHP paragneisses.
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Phengite
    Description: Coesite-bearing titanite UHP paragneisses. In retrograded eclogites : inclusions in garnet (Eur. J. Mineral. , 1995, 7, pp. 119-138). In garnet/biotite gneisses (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In epidote two-micas schists : replaced by biotite + feldspar (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In layered eclogites intercalated with paragneisses : phengite is replaced by biotite rims.
    Reference: []
  		•  Phlogopite
    KMg
     
    3
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Description: In carbonate eclogites : inclusions in garnet(Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In marbles.
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138]
  		•  Quartz
    SiO
     
    2
    Description: Coesite-bearing titanite UHP paragneisses. In retrograded eclogites (Eur. J. Mineral. , 1995, 7, pp. 119-138). In garnet/biotite gneisses (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In jadeite quartzite : in matrix (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). Quartz (inclusions in garnet and jadeite) replaces coesite and is rimmed by aegirine-augite. In epidote two-micas schists (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In layered eclogites intercalated with paragneisses : after coesite.
    Reference: []
  		•  Rutile
    TiO
     
    2
    Description: Coesite-bearing titanite UHP paragneisses. - Inclusions in titanite. - Clusters in matrix with rims of secondary titanite. In fresh eclogites (Eur. J. Mineral. , 1995, 7, pp. 119-138). In retrograded eclogites : inclusions in garnet (Eur. J. Mineral. , 1995, 7, pp. 119-138). In garnet/biotite gneisses (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In jadeite quartzite : in matrix (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In epidote two-micas schists (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In various eclogites. In layered eclogites intercalated with paragneisses.
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Spessartine
    Mn
    2+
    3
    		Al
     
    2
    		[SiO
     
    4
    		]
     
    3
    Description: Coesite-bearing titanite UHP paragneisses. Spessartite-almandine garnet with a skeletal texture(intergrowth with quartz and plagioclase).
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Talc
    Mg
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    Description: Shuanghe/ Dabie Shan.
    Reference: [Chemical Geology, 186, 2002, pp. 315-331.]
  		•  Taramite
    Na[CaNa][Fe
    2+
    3
    		AlFe
    3+
     
    		][(OH)
     
    2
    		|Al
     
    2
    		Si
     
    6
    		O
     
    22
    		]
    Description: In jadeite quartzite : in matrix (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). Taramite is replaced by chlorite+ magnetite.
    Reference: [Eur. J. Mineral. , 1995, 7, pp. 119-138. ]
  		•  Titanite
    CaTi[O|SiO
     
    4
    		]
    Description: Coesite-bearing titanite UHP paragneisses. In retrograded eclogites : replaces rutile in matrix (Eur. J. Mineral. , 1995, 7, pp. 119-138). In carbonate eclogites : UHP Al-rich (Al2O3 up to 9.4 wt%) titanite, relictual in garnet, containing rutile inclusions and replaced by ilmenite rims (Shanghue / Eur. J. Mineral. , 1995, 7, pp. 119-138). In garnet/biotite gneisses (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). Replaces rutile in amphibolites. In jadeite quartzite : in matrix (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In marbles. In epidote two-micas schists (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Zircon
    Zr[SiO
     
    4
    		]
    Description: Coesite-bearing titanite UHP paragneisses. In jadeite quartzite (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138). In layered eclogites intercalated with paragneisses.
    Reference: [American Mineralogist, Volume 87, pages 875-881, 2002, KAI YE et al. "Ultrahigh-pressure (UHP) low-Al titanites from carbonate-bearing rocks in Dabieshan-Sulu UHP terrane, eastern China".]
  		•  Zoisite
    {Ca
     
    2
    		}{Al
     
    3
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Description: Coesite-bearing titanite UHP paragneisses. Intermediary rim between allanite core and titanite outer zone in composite crystals. In epidote two-micas schists (Shuanghe / Eur. J. Mineral. , 1995, 7, pp. 119-138).
    Reference: [Am. Min. , V 87, pp. 875-881, 2002.]


    35 entries listed. 24 valid minerals.

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