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Xiamaidi mafic–ultramafic intrusion, Yunlong County, Dali, Yunnan, Chinai
Regional Level Types
Xiamaidi mafic–ultramafic intrusionIntrusion
Yunlong CountyCounty
DaliPrefecture
YunnanProvince
ChinaCountry

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Latitude & Longitude (WGS84):
25° 33' 59'' North , 99° 3' 59'' East
Latitude & Longitude (decimal):
25.56667,99.06667
GRN:
N18E63
Type:
Intrusion
Köppen climate type:
Cwb : Subtropical highland climate or temperate oceanic climate with dry winters
Mindat Locality ID:
452034
Long-form identifier:
mindat:1:2:452034:7
GUID (UUID V4):
0


The Xiamaidi intrusion is a northwest-trending mafic–ultramafic body with ∼ 1.2 km in length and ∼ 1.0 km in width, making it the largest outcrop in this region. The Xiamaidi intrusive rocks intruding the Middle Silurian limestone and siltstone consist of a gabbroic body in the northeast and an ultramafic body in the southwest, with a sharp contact between the two bodies but no chilled margins. The gabbroic body is composed of olivine gabbro and gabbro. The ultramafic body is dominantly made up of lherzolite.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List


7 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ Chromite
Formula: Fe2+Cr3+2O4
ⓘ 'Clinopyroxene Subgroup'
ⓘ Enstatite
Formula: Mg2Si2O6
ⓘ Enstatite var. Bronzite
Formula: (Mg,Fe2+)2[SiO3]2
ⓘ Forsterite
Formula: Mg2SiO4
ⓘ 'Olivine Group'
Formula: M2SiO4
ⓘ 'Orthopyroxene Subgroup'
ⓘ Pentlandite
Formula: (NixFey)Σ9S8
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Pyrrhotite
Formula: Fe1-xS

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘPentlandite2.BB.15(NixFey)Σ9S8
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrrhotite2.CC.10Fe1-xS
Group 4 - Oxides and Hydroxides
ⓘChromite4.BB.05Fe2+Cr3+2O4
Group 9 - Silicates
ⓘForsterite9.AC.05Mg2SiO4
ⓘEnstatite9.DA.05Mg2Si2O6
ⓘvar. Bronzite9.DA.05(Mg,Fe2+)2[SiO3]2
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Unclassified
ⓘ'Clinopyroxene Subgroup'-
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'Orthopyroxene Subgroup'-
ⓘ'Olivine Group'-M2SiO4

List of minerals for each chemical element

OOxygen
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ ChromiteFe2+Cr23+O4
Oⓘ EnstatiteMg2Si2O6
Oⓘ ForsteriteMg2SiO4
Oⓘ Enstatite var. Bronzite(Mg,Fe2+)2[SiO3]2
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oⓘ Olivine GroupM2SiO4
NaSodium
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgⓘ EnstatiteMg2Si2O6
Mgⓘ ForsteriteMg2SiO4
Mgⓘ Enstatite var. Bronzite(Mg,Fe2+)2[SiO3]2
AlAluminium
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ EnstatiteMg2Si2O6
Siⓘ ForsteriteMg2SiO4
Siⓘ Enstatite var. Bronzite(Mg,Fe2+)2[SiO3]2
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Siⓘ Olivine GroupM2SiO4
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ Pentlandite(NixFey)Σ9S8
Sⓘ PyrrhotiteFe1-xS
CaCalcium
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
CrChromium
Crⓘ ChromiteFe2+Cr23+O4
FeIron
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ ChalcopyriteCuFeS2
Feⓘ ChromiteFe2+Cr23+O4
Feⓘ Pentlandite(NixFey)Σ9S8
Feⓘ PyrrhotiteFe1-xS
Feⓘ Enstatite var. Bronzite(Mg,Fe2+)2[SiO3]2
NiNickel
Niⓘ Pentlandite(NixFey)Σ9S8
CuCopper
Cuⓘ ChalcopyriteCuFeS2

Other Regions, Features and Areas containing this locality

AsiaContinent
China
Eurasian PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

[1]Liu, Jinyu, Xue, Shengchao, Zhang, Yuguang, Wang, Qingfei, Wang, Luyang, Li, Chusi, Deng, Jun (2025) Petrological and geochemical studies of the Xiamaidi mafic–ultramafic intrusion in the Baoshan block, with implications for Ni exploration. Ore Geology Reviews, 178. 106490 doi:10.1016/j.oregeorev.2025.106490
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