The Complex intrudes Late Proterozoic granitoids and metasediments and is shaped like an hour glass with max dimensions of c.3x4km. About 30% of the complex is obscured by soil.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

15 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

ⓘ 'Melanocratic nephelinolite'

Detailed Mineral List:

ⓘ Aegirine

Formula: NaFe³⁺Si₂O₆

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

Heaman, L. M., Srivastava, R. K., & Sinha, A. K. (2002). A precise U–Pb zircon/baddeleyite age for the Jasra igneous complex, Karbi–Analong District, Assam, NE India. Current Science, 744-748.

Srivastava, R. K., & Sinha, A. K. (2004). Geochemistry of Early Cretaceous alkaline ultramafic-mafic complex from Jasra, Karbi Anglong, Shillong plateau, northeastern India. Gondwana Research, 7(2), 549-561.

Srivastava, R. K., & Sinha, A. K. (2007). Nd and Sr isotope systematics and geochemistry of a plume-related Early Cretaceous alkaline-mafic-ultramafic igneous complex from Jasra, Shillong Plateau, northeastern India. SPECIAL PAPERS-GEOLOGICAL SOCIETY OF AMERICA, 430, 815-830.

Melluso, L., Srivastava, R. K., Guarino, V., Zanetti, A., Sinha, A. K. (2010) MINERAL COMPOSITIONS AND PETROGENETIC EVOLUTION OF THE ULTRAMAFIC-ALKALINE - CARBONATITIC COMPLEX OF SUNG VALLEY, NORTHEASTERN INDIA. The Canadian Mineralogist, 48 (1) 205-229 doi:10.3749/canmin.48.1.205

ⓘ Aegirine-augite

Formula: (Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ 'Alkali Feldspar'

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ 'Amphibole Supergroup'

Formula: AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Baddeleyite

Formula: ZrO₂

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Calcite

Formula: CaCO₃

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ 'Clinopyroxene Subgroup'

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Diopside

Formula: CaMgSi₂O₆

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Enstatite

Formula: Mg₂Si₂O₆

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ 'Fayalite-Forsterite Series'

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ 'Garnet Group'

Formula: X₃Z₂(SiO₄)₃

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Nepheline

Formula: Na₃K(Al₄Si₄O₁₆)

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Perovskite

Formula: CaTiO₃

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Phlogopite

Formula: KMg₃(AlSi₃O₁₀)(OH)₂

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ 'Pyroxene Group'

Formula: ADSi₂O₆

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Sodalite

Formula: Na₄(Si₃Al₃)O₁₂Cl

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ 'Sodic plagioclase'

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Titanite

Formula: CaTi(SiO₄)O

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ 'Zeolite Group'

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

ⓘ Zirconolite

Formula: CaZrTi₂O₇

References:

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Perovskite	4.CC.30	CaTiO₃
ⓘ	Baddeleyite	4.DE.35	ZrO₂
ⓘ	Zirconolite	4.DH.30	CaZrTi₂O₇
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 9 - Silicates
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Titanite	9.AG.15	CaTi(SiO₄)O
ⓘ	Enstatite	9.DA.05	Mg₂Si₂O₆
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Diopside	9.DA.15	CaMgSi₂O₆
ⓘ	Aegirine-augite	9.DA.20	(Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆
ⓘ	Aegirine	9.DA.25	NaFe³⁺Si₂O₆
ⓘ	Phlogopite	9.EC.20	KMg₃(AlSi₃O₁₀)(OH)₂
ⓘ	Nepheline	9.FA.05	Na₃K(Al₄Si₄O₁₆)
ⓘ	Sodalite	9.FB.10	Na₄(Si₃Al₃)O₁₂Cl
ⓘ	'Zeolite Group'	9.G0.
Unclassified
ⓘ	'Alkali Feldspar'	-
ⓘ	'Amphibole Supergroup'	-	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Clinopyroxene Subgroup'	-
ⓘ	'Fayalite-Forsterite Series'	-
ⓘ	'Pyroxene Group'	-	ADSi₂O₆
ⓘ	'Garnet Group'	-	X₃Z₂(SiO₄)₃
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)
ⓘ	'Sodic plagioclase'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
C	Carbon
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Aegirine	NaFe³⁺Si₂O₆
O	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
O	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Baddeleyite	ZrO₂
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Diopside	CaMgSi₂O₆
O	ⓘ Enstatite	Mg₂Si₂O₆
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
O	ⓘ Perovskite	CaTiO₃
O	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
O	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
O	ⓘ Titanite	CaTi(SiO₄)O
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Zirconolite	CaZrTi₂O₇
O	ⓘ Fayalite-Forsterite Series
O	ⓘ Pyroxene Group	ADSi₂O₆
O	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
F	Fluorine
F	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Na	Sodium
Na	ⓘ Aegirine	NaFe³⁺Si₂O₆
Na	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Na	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Na	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Mg	Magnesium
Mg	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Diopside	CaMgSi₂O₆
Mg	ⓘ Enstatite	Mg₂Si₂O₆
Mg	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Mg	ⓘ Fayalite-Forsterite Series
Al	Aluminium
Al	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Al	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Al	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Al	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Si	Silicon
Si	ⓘ Aegirine	NaFe³⁺Si₂O₆
Si	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Si	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Diopside	CaMgSi₂O₆
Si	ⓘ Enstatite	Mg₂Si₂O₆
Si	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Si	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Si	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Si	ⓘ Titanite	CaTi(SiO₄)O
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Fayalite-Forsterite Series
Si	ⓘ Pyroxene Group	ADSi₂O₆
Si	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
P	Phosphorus
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Cl	Chlorine
Cl	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Cl	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
K	Potassium
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
K	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Diopside	CaMgSi₂O₆
Ca	ⓘ Perovskite	CaTiO₃
Ca	ⓘ Titanite	CaTi(SiO₄)O
Ca	ⓘ Zirconolite	CaZrTi₂O₇
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ti	Titanium
Ti	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Ti	ⓘ Perovskite	CaTiO₃
Ti	ⓘ Titanite	CaTi(SiO₄)O
Ti	ⓘ Zirconolite	CaZrTi₂O₇
Fe	Iron
Fe	ⓘ Aegirine	NaFe³⁺Si₂O₆
Fe	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Fayalite-Forsterite Series
Zr	Zirconium
Zr	ⓘ Baddeleyite	ZrO₂
Zr	ⓘ Zircon	Zr(SiO₄)
Zr	ⓘ Zirconolite	CaZrTi₂O₇

Geochronology

Mineralization age: Early/Lower Cretaceous : 105.2 ± 0.5 Ma

Important note: This table is based only on rock and mineral ages recorded on mindat.org for this locality and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic Time

Rocks, Minerals and Events

Phanerozoic

Mesozoic

Cretaceous

Early/Lower Cretaceous

ⓘ Baddeleyite	105.2 ± 0.5 Ma
ⓘ Zircon	105.2 ± 0.5 Ma

Other Regions, Features and Areas containing this locality

AsiaContinent

Hindukush Himalayan RegionGroup of Mountain Ranges

Indian Plate (India Plate)Tectonic Plate

Shillong PlateauShield

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

Kumar, D., Mamallan, R., Dwivedy, K.K. (1996) Carbonatite magmatism in northeast India. Journal of Southeast Asian Earth Sciences, 13(2), 145-158.

Woolley, Alan R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe (excluding the former USSR), Australasia and Oceanic Islands. The Geological Society of London. doi:10.1144/mpar4

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Jasra, West Karbi Anglong District, Assam, IndiaiRegional Level TypesJasraComplex West Karbi Anglong DistrictDistrict AssamState IndiaCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Mineral List

Rock Types Recorded

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Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Geochronology

Other Regions, Features and Areas containing this locality

References

Jasra, West Karbi Anglong District, Assam, India i
Regional Level Types
Jasra Complex
West Karbi Anglong District District
Assam State
India Country