Alkali amphibole

A synonym

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Arfvedsonite

Hurricane Mountain localities, North Conway, Conway, Carroll County, New Hampshire, USA

Glaucophane

Rio Oremo, Chiavolino, Pollone, Biella Province, Piedmont, Italy

Glaucophane, etc.

Ward Creek [1], Cazadero, Coast Range, Sonoma County, California, USA

Arfvedsonite

Hurricane Mountain localities, North Conway, Conway, Carroll County, New Hampshire, USA

Glaucophane

Rio Oremo, Chiavolino, Pollone, Biella Province, Piedmont, Italy

Glaucophane, etc.

Ward Creek [1], Cazadero, Coast Range, Sonoma County, California, USA

Arfvedsonite

Hurricane Mountain localities, North Conway, Conway, Carroll County, New Hampshire, USA

Glaucophane

Rio Oremo, Chiavolino, Pollone, Biella Province, Piedmont, Italy

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About Alkali amphiboleHide

Synonym of:

A petrological term for alkali rich amphiboles.

Mindat ID:

48007

Long-form identifier:

mindat:1:1:48007:1

Recorded ages:

Mesoproterozoic to Paleogene : 1456 Ma to 41 Ma - based on 26 recorded ages.

Sample ages:

Sample ID	Recorded age	Geologic Time	Dating method
1	41 Ma	Eocene	K-Ar
2	51 Ma	Eocene	K-Ar
3	80.1 ± 3.1 Ma	Late/Upper Cretaceous	K-Ar
4	212 Ma	Late/Upper Triassic	K-Ar
5	226 ± 1.1 Ma	Late/Upper Triassic	K-Ar
6	226 ± 1.1 Ma	Late/Upper Triassic	K-Ar
7	239.2 ± 0.4 Ma	Middle Triassic	SHRIMP zircon U-Pb dating of riebeckite granite
8	319 ± 8 Ma	Pennsylvanian	Ar-Ar
9	377 ± 7 Ma	Late/Upper Devonian	K-Ar
10	394 ± 15 Ma	Early/Lower Devonian	K-Ar
11	430 ± 12 Ma	Wenlock	K-Ar
12	551 Ma	Ediacaran	K-Ar
13	1456 to 1359 Ma	Mesoproterozoic	K-Ar

Sample references:

ID	Locality	Reference	Notes
1	Warsak Intrusions, Mohmand District, Khyber Pakhtunkhwa Province, Pakistan	Kempe, D. R. C. (1973) The petrology of the Warsak alkaline granites, Pakistan, and their relationship to other alkaline rocks of the region. Geological Magazine, 110 (5) 385-404 doi:10.1017/s0016756800036189	Riebeckite from granite
2	Gigye-Gyeongju granite, Gyeongju City, North Gyeongsang Province, South Korea	Hwang, B. H., McWilliams, M., Son, M., & Yang, K. (2007). Tectonic implication of A-type granites across the Yangsan fault, Gigye and Gyeongju areas, southeast Korean Peninsula. International Geology Review, 49(12), 1094-1102.
3	Bardkish syenite, Urmia County, West Azerbaijan Province, Iran	Ghalamghash, J., N
4	Longwangzhuang pluton, Luanchuan County, Luoyang, Henan, China