Geochemical constraints on the genesis of the Pb–Zn deposit of Jalta (northern Tunisia): implications for timing of mineralization, sources of metals and relationship to the Neogene volcanism

Jemmali, Nejib, Souissi, Fouad, Carranza, Emmanuel John M., Vennemann, Torsten W., and Bogdanov, Kamen (2014) Geochemical constraints on the genesis of the Pb–Zn deposit of Jalta (northern Tunisia): implications for timing of mineralization, sources of metals and relationship to the Neogene volcanism. Chemie der Erde - Geochemistry, 74 (4). pp. 601-613.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1016/j.chemer.2014....
 
5
1


Abstract

The occurrence of Pb–Zn deposits of Jalta district (northern Tunisia) as open space fillings and cements and breccia in the contact zones between Triassic dolostones and Miocene conglomerates along or near major faults provides evidence of the relationship between the mineralization and tectonic processes. Pb isotopes in galena from the deposits yielded average 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios of 18.821, 15.676 and 38.837, respectively, implying a well-mixed multi-source upper crustal reservoir of metals. Magmatism and compressional tectonism during the Alpine orogeny favored Pb–Zn mineralization in the Jalta district. The enrichment in Pb, Zn, Cd and Co of the Triassic carbonates and enrichments in Pb, Zn and Cd in Triassic clayey shales is associated with hydrothermal alteration around faults. Alunite in the deposit has δ34S values (−2.5 to −1.5‰ VCDT), which could have been formed at and above the water table in a kind of steam-heated environment, where fluids containing H2S mixed with fluids containing K and Al. The H2S could have been produced by TSR of sulfates at high temperature at depth and then leaked upward through deep-seated faults, whereas the K and Al could have been acid-leached from Miocene volcanic rocks.

Item ID: 37198
Item Type: Article (Research - C1)
ISSN: 0009-2819
Keywords: mineralogy; lead isotope; trace metals; sulfur isotope; steam-heated fluids; Miocene volcanics; Jalta; northern Tunisia
Date Deposited: 29 Jan 2015 01:12
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 50%
04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 50%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840108 Zinc Ore Exploration @ 100%
Downloads: Total: 1
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page