Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.

Locality Name:
Salem, Essex Co., Massachusetts, USA

Oldest recorded age at locality: 396
Youngest recorded age at locality: 388

mindat Locality ID: 15757
mindat URL: http://www.mindat.org/loc-15757.html

Tectonic Settings:

Total number of sublocalities beneath "Salem, Essex Co., Massachusetts, USA": 5
Total number of bottom-level sublocalities: 5

Number of Child Localities: 5
Child Localities:
Baker's Island
Coney Island
Great Haste Ledge (Great Haste Island)
Great Misery Island
Ram Islands

Latitude: 42°32'10"N
Longitude: 70°48'51"W
Decimal Degree (lat, lon): 42.536111111111,-70.814166666667

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
	This mineral's age has not yet been recorded.

Amorphous	Amphibole	Analcime	Cancrinite	Cancrinite-sodalite	Chlorite	Clay	Clinozoisite	Corundum	Epidote
Feldspar	Mica	Molybdenite	Natrolite	None	Pyrite	Pyroxene	Sapphirine	Serpentine	Sodalite
Spinel	Titanite	Tridymite	Zircon

Aegirine ()*	Aegirine-augite ()*	Aenigmatite ()*	Albite ()*	Analcime ()*
Annite ()*	Anorthite ()*	Augite ()*	Cancrinite ()*	Chrysotile ()*
Clinochlore ()*	Dolomite ()*	Enstatite ()*	Epidote ()*	Ferro-hornblende ()*
Hematite ()*	Magnetite ()*	Microcline ()*	Molybdenite ()*	Natrolite ()*
Nepheline ()*	Opal ()*	Orthoclase ()*	Pyrite ()*	Riebeckite ()*
Sanidine ()*	Sodalite ()*	Titanite ()*	Zircon ()*

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al C Ca Cl Fe H K Mg Mo Na O S Si Ti Zr

Elements from minerals reported directly at this locality: Al C Ca Fe H K Mg Mo Na O S Si Ti

Structural Groups for minerals in this locality:
Amorphous Amphibole Analcime Cancrinite Cancrinite-sodalite Chlorite Clay Clinozoisite Corundum Epidote
Feldspar Mica Molybdenite Natrolite None Pyrite Pyroxene Sapphirine Serpentine Sodalite
Spinel Titanite Tridymite Zircon

29 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Aegirine ()*	Pyroxene	NaFe³⁺Si₂O₆	396	388	0		1022
Aegirine-augite ()*	Pyroxene	(Ca,Na)(Fe³⁺,Mg,Fe²⁺)Si₂O₆	396	388	0		286
Aenigmatite ()*	Sapphirine	Na₄[Fe²⁺₁₀Ti₂]O₄[Si₁₂O₃₆]	396	388	1	219395	133
Albite ()*	Feldspar	Na(AlSi₃O₈)	396	388	1	219394	8803
Analcime ()*	Analcime	Na(AlSi₂O₆)·H₂O	396	388	0		1627
Annite ()*	Mica Clay	KFe²⁺₃(AlSi₃O₁₀)(OH)₂	396	388	0		356
Anorthite ()*	Feldspar	Ca(Al₂Si₂O₈)	396	388	0		1036
Augite ()*	Pyroxene	(Ca,Mg,Fe)₂Si₂O₆	396	388	0		2060
Cancrinite ()*	Cancrinite	(Na,Ca, )₈(Al₆Si₆)O₂₄(CO₃,SO₄)₂·2H₂O	396	388	2	219395,219397	232
Chrysotile ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄	396	388	0		951
Clinochlore ()*	Chlorite Clay	Mg₅Al(AlSi₃O₁₀)(OH)₈	396	388	0		1756
Dolomite ()*	None	CaMg(CO₃)₂	396	388	0		9895
Enstatite ()*	Pyroxene	Mg₂Si₂O₆	396	388	1	219396	944
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	396	388	2	219394,219396	8173
Ferro-hornblende ()*	Amphibole	Ca₂(Fe²⁺₄Al)(Si₇Al)O₂₂(OH)₂	396	388	0		271
Hematite ()*	Corundum	Fe₂O₃	396	388	0		14640
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	396	388	1	219395	14899
Microcline ()*	Feldspar	K(AlSi₃O₈)	396	388	1	219394	4924
Molybdenite ()*	Molybdenite	MoS₂	396	388	0		5800
Natrolite ()*	Natrolite	Na₂(Si₃Al₂)O₁₀·2H₂O	396	388	0		1236
Nepheline ()*	Tridymite	Na₃K(Al₄Si₄O₁₆)	396	388	1	219396	884
Opal ()*	Amorphous	SiO₂·nH₂O	396	388	0		2994
Orthoclase ()*	Feldspar	K(AlSi₃O₈)	396	388	1	219394	2349
Pyrite ()*	Pyrite	FeS₂	396	388	0		39462
Riebeckite ()*	Amphibole	Na₂(Fe²⁺₃Fe³⁺₂)Si₈O₂₂(OH)₂	396	388	0		375
Sanidine ()*	Feldspar	K(AlSi₃O₈)	396	388	1	219394	598
Sodalite ()*	Cancrinite-sodalite Sodalite	Na₄(Si₃Al₃)O₁₂Cl	396	388	2	219395,219396	444
Titanite ()*	Titanite	CaTi(SiO₄)O	396	388	0		4899
Zircon ()*	Zircon	Zr(SiO₄)	396	388	2	219394,219395	5251

1 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	Bradley_2012_072	396	388	392±4	U/Pb			zircon				Zircon			15757	Salem, Essex Co., Massachusetts, USA	Salem gabbro diorite	McCauley and Bradley (2014)	10.3749/canmin.52.2.183	CM52_183

Sample	Source Locality	Reference URL
FKM-245	Salem, Essex Co., Massachusetts, USA	https://www.rockptx.com/fkm-226-to-fkm-250/#FKM-245

All locality data graciously provided by mindat.org

All age data...