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Open-File Report 2014–1240

Prepared in cooperation with the Iraq Geological Survey under the auspices of the U.S. Department of Defense, Task Force for Business and Stability Operations

A Reconnaissance for Signs of a Mississippi Valley-Type Lead-Zinc Mineralizing System on the Eastern Flank of the Rutbah Uplift, Anbar Province, Iraq

By Timothy S. Hayes, Mazin Mustafa, and Thair Benni

Abstract

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

For additional information, contact:
Geology, Minerals, Energy, & Geophysics Science Center
U.S. Geological Survey, c/o University of Arizona
ENRB Building, 520 N. Park Ave, Rm 355
Tucson, Arizona 85719-5035
http://geomaps.wr.usgs.gov/gmeg/

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Suggested citation:

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)



Contents

Abstract

Introduction

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

Discussion

Conclusions


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