Open-File Report 2014–1240
Reconnaissance field visits and rock sampling were conducted at eight geologically selected locations within Mesozoic rocks on the eastern flank of the Rutbah Uplift, Anbar Province, western Iraq, in an attempt to determine if these rocks have been affected by a Mississippi Valley-Type (MVT) lead-zinc mineralizing system. Samples subsequently were studied by carbonate mineral staining, transmitted and reflected light petrology, and scanning electron microscopy with semi-quantitative energy dispersive elemental analyses. Single samples were studied by each, inductively coupled plasma mass spectrometry analyses of trace elements and fluid inclusion microthermometry. Permissive evidence indicates that there has been a MVT system present, but none of the evidence is considered definitive.
First posted November 25, 2014
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Hayes, T.S., Mustafa, M., and Benni, T., 2014, A reconnaissance for signs of a Mississippi Valley-type lead-zinc mineralizing system on the eastern flank of the Rutbah Uplift, Anbar Province, Iraq: U.S. Geological Survey Open-File Report 2014-1240, 28 p., https://dx.doi.org/10.3133/ofr20141240.
ISSN 2331-1258 (online)
Mississippi Valley-Type Mineralizing System Characteristics and Their Possible Analogues on the Rutbah Uplift
Location 1—Coarse-Crystalline Hydrothermal Dolomite or Calcite
Location 2—Najmah Formation Limestone Immediately Beneath the J-K Unconformity and Nahr Umr Dolostone
Locations 2(D, E) and 5—Residual Goethite Concentration in a Shallow Depression within Najmah Formation and Coarse Calcite-Goethite in Vugs in Muhaiwir Formation
Location 3—Mauddud Formation as Host Rock for a MVT Deposit
Location 6—Al-Mudbaie Fault
Location 7—Brecciated Carbonate Rock in the Muhaiwir Formation
Location 8—White Sparry Calcite Veinlets
Location 4—Hussainiyat Ironstone Deposit and Its Possible Relation to a MVT Mineralizing System