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:
Pacoima Canyon, San Gabriel Mts, Los Angeles Co., California, USA

Oldest recorded age at locality: 1205
Youngest recorded age at locality: 1167

mindat Locality ID: 26974
mindat URL: http://www.mindat.org/loc-26974.html

Tectonic Settings:

Total number of sublocalities beneath "Pacoima Canyon, San Gabriel Mts, Los Angeles Co., California, USA": 8
Total number of bottom-level sublocalities: 8

Number of Child Localities: 8
Child Localities:
Black Lode (Gilman Deposit)
Blue Quartz Occurrence
Jamestown No. 2 Deposit (Jamestown Deposit)
Ore Hill Mine
Pacoima Canyon Allanite Pegmatite Locality No. 2
Pacoima Canyon Allanite Pegmatite Ridge Area
Pacoima Canyon Pegmatite Locality (Pacoima Canyon Allanite Pegmatite; Allanite Locality)
Unnamed Small Prospect

Latitude: 34°20'45"N
Longitude: 118°22'23"W
Decimal Degree (lat, lon): 34.345833333333,-118.37305555556

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.

Allanite	Apatite	Beryl	Calcite	Clay	Clinozoisite	Corundum	Covellite	Epidote	Feldspar
Malachite	Melanterite	Mica	Nickeline	None	Quartz	Spinel	Stibnite	Titanite	Vivianite
Zircon

Albite ()*	Allanite-(Ce) ()*	Annabergite ()*	Beryl ()*	Covellite ()*
Epidote ()*	Fluorapatite ()*	Graphite ()*	Ilmenite ()*	Magnetite ()*
Malachite ()*	Melanterite ()*	Microcline ()*	Muscovite ()*	Pyrrhotite ()*
Quartz ()*	Siderite ()*	Stibnite ()*	Thorite ()*	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 As Be C Ca Ce Cu F Fe H K Na Ni O P S Sb Si Th Ti Zr

Elements from minerals reported directly at this locality: Al Ca Fe H O S Sb Si

Structural Groups for minerals in this locality:
Allanite Apatite Beryl Calcite Clay Clinozoisite Corundum Covellite Epidote Feldspar
Malachite Melanterite Mica Nickeline None Quartz Spinel Stibnite Titanite Vivianite
Zircon

21 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
Albite ()*	Feldspar	Na(AlSi₃O₈)	1205	1167	2	161536,161538	8803
Allanite-(Ce) ()*	Allanite Epidote	CaCe(Al₂Fe²⁺)[Si₂O₇][SiO₄]O(OH)	1205	1167	1	161538	706
Annabergite ()*	Vivianite	Ni₃(AsO₄)₂·8H₂O	1205	1167	1	161535	445
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈	1205	1167	2	161536,161538	4286
Covellite ()*	Covellite	CuS	1205	1167	1	161535	4165
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	1205	1167	0		8173
Fluorapatite ()*	Apatite	Ca₅(PO₄)₃F	1205	1167	1	161538	2740
Graphite ()*	None	C	1205	1167	3	161532,161534,161536	2812
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃	1205	1167	1	161536	5433
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	1205	1167	1	161538	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂	1205	1167	1	161535	12537
Melanterite ()*	Melanterite	Fe(SO₄)·7H₂O	1205	1167	1	161535	915
Microcline ()*	Feldspar	K(AlSi₃O₈)	1205	1167	1	161538	4924
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	1205	1167	1	161538	17380
Pyrrhotite ()*	Nickeline	Fe₇S₈	1205	1167	1	161535	9056
Quartz ()*	Quartz	SiO₂	1205	1167	3	161533,161536,161538	61156
Siderite ()*	Calcite	Fe(CO₃)	1205	1167	1	161535	6417
Stibnite ()*	Stibnite	Sb₂S₃	1205	1167	0		3418
Thorite ()*	Zircon	Th(SiO₄)	1205	1167	2	161536,161538	1006
Titanite ()*	Titanite	CaTi(SiO₄)O	1205	1167	1	161536	4899
Zircon ()*	Zircon	Zr(SiO₄)	1205	1167	2	161536,161538	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_125	1205	1167	1186±19	U/Pb			zircon			Yes	Zircon			28941	San Gabriel Mts, Los Angeles Co., California, USA	Mendenhall Peak	McCauley and Bradley (2014)	10.3749/canmin.52.2.183	CM52_183

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...