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Gila Bend Mts, Maricopa Co., Arizona, USA

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Ref.: Lopez, Robert, and Cameron, K. L. (1997) High-Mg andesites from the Gila Bend Mountains, southwestern Arizona; evidence for hydrous melting of lithosphere during Miocene extension. Geological Society of America Bulletin, July 1997: 109(7): 900-914.

Garvie, L.A.J. (2003) Decay-induced biomineralization of the saguaro cactus (Carnegiea gigantean). American Mineralogist: 88: 1879-1888.

Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 4, 5, 6.

The Gila Bend Mountains are a mountain range with a maximum altitude of 1,581 feet (481.89 meters) above sea level.

Miocene andesites and basaltic andesites from the eastern Gila Bend Mountains have high Mg# values (most 66-72), high concentrations of Ni and Cr, and olivine phenocrysts as Mg rich as Fo90. The high-Mg andesites erupted near the end of Miocene extension in the Gila Bend region. The high-Mg andesites are interpreted to reflect hydrous melting of harzburgite near the base of mantle lithosphere at unusually low pressure. The low pressure was the result of tectonic thinning of the lithosphere during extension, and the source of the volatiles was most likely contemporaneous subduction. Although the Nd isotopic composition of the Gila Bend lavas originated from Proterozoic mantle lithosphere, the Pb isotope ratios mainly reflect the influence of Mesozoic and Cenozoic subduction. (This record excerpt provided courtesy of AGI/GeoRef).





 Map Reference: 33°13'21"N , 113°2'14"W

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Mineral list contains entries from the region specified including sub-localities


Mineral List:
  		•  Bornite
    Cu
     
    5
    		FeS
     
    4
    Reference: [MRDS file #10046345.]
  		•  Chalcocite
    Cu
     
    2
    		S
    Reference: [MRDS file #10046345.]
  		•  Chalcopyrite
    CuFeS
     
    2
    Reference: [MRDS file #10046345.]
  		•  Chrysocolla
    (Cu,Al)
     
    2
    		H
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    		·nH
     
    2
    		O
    Reference: [MRDS file #10046345.]
  		•  Cuprite
    Cu
     
    2
    		O
    Reference: [MRDS file #10046345.]
  		•  Glushinskite
    Mg[C
     
    2
    		O
     
    4
    		] · 2H
     
    2
    		O
    Description: Occurs as a weathering product of Weddellite in decaying suguaro cacti.
    Reference: [Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 4; Garvie, L.A.J. (2003) Decay-induced biomineralization of the saguaro cactus (Carnegiea gigantean). American Mineralogist: 88: 1879-1888.]
  		•  Lansfordite
    MgCO
     
    3
    		·5H
     
    2
    		O
    Reference: [Corbett, R.G., Hanner, B.M., and Quick, T.J. (1989) Seeps and efflorescent minerals in the Grand Canyon: Predicted vs. identified phases [abs.]: Geological Society of America Abstracts with Programs, v. 21, no. 4, p. 8. Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 5; Garvie, L.A.J. (2003) Decay-induced biomineralization of the saguaro cactus (Carnegiea gigantean). American Mineralogist: 88: 1879-1888.]
  		•  Malachite
    Cu
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
    Reference: [MRDS file #10046345.]
  		•  Monohydrocalcite
    CaCO
     
    3
    		·H
     
    2
    		O
    Reference: [Garvie, L.A.J. (2003) Decay-induced biomineralization of the saguaro cactus (Carnegiea gigantean). American Mineralogist: 88: 1879-1888. Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 6.]
  		•  Nesquehonite
    MgCO
     
    3
    		·3H
     
    2
    		O
    Description: Occurs as a weathering product of Weddellite in decaying suguaro cacti.
    Reference: [Garvie, L.A.J. (2003) Decay-induced biomineralization of the saguaro cactus (Carnegiea gigantean). American Mineralogist: 88: 1879-1888. Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 6.]
  		•  'Sericite'
    Reference: [MRDS file #10046345.]
  		•  'Tourmaline'
    Reference: [MRDS file #10046345.]


    12 entries listed. 10 valid minerals.

    Localities in this Region:
    USA
     
    • Arizona
      • Maricopa Co.
        • Gila Bend Mts
          • Webb District
            • Spring Mountain

    The above list 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!
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in Arizona, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 7th Nov 2009 01:18:28