Basalts from Iceland and Along the Reykjanes Ridge: Sr Isotope Geochemistry

1973 ◽  
Vol 246 (155) ◽  
pp. 104-107 ◽  
Author(s):  
S. R. HART ◽  
J.-G. SCHILLING ◽  
J. L. POWELL
Keyword(s):  
Isotope Geochemistry ◽  
Sr Isotope ◽  
Reykjanes Ridge

Origin of the Xitieshan Pb-Zn deposit, Qinghai, China: Evidence from petrography and S-C-O-Sr isotope geochemistry

2021 ◽  
pp. 104429
Author(s):  
Zhixin Zhao ◽  
David L. Leach ◽  
Junhao Wei ◽  
Shengnan Liang ◽  
Katharina Pfaff
Keyword(s):  
Isotope Geochemistry ◽  
Sr Isotope

Pb-Nd-Sr Isotope Geochemistry of Metapelites from the Iberian Pyrite Belt and Its Relevance to Provenance Analysis and Mineral Exploration Surveys

2021 ◽  
Author(s):  
Filipa Luz ◽  
António Mateus ◽  
Ezequiel Ferreira ◽  
Colombo G. Tassinari ◽  
Jorge Figueiras
Keyword(s):  
Isotope Geochemistry ◽  
Mineral Exploration ◽  
Hanging Wall ◽  
Massive Sulfide ◽  
Iberian Pyrite Belt ◽  
Isotopic Signature ◽  
Sr Isotope ◽  
Provenance Analysis ◽  
Basement Rocks ◽  
World Class

Abstract The boundary in the Iberian Pyrite Belt is a world-class metallogenic district developed at the Devonian-Carboniferous boundary the Iberian Variscides that currently has seven active mines: Neves Corvo (Cu-Zn-Sn) and Aljustrel (Cu-Zn) in Portugal, and Riotinto (Cu), Las Cruces (Cu), Aguas Teñidas (Cu-Zn-Pb), Sotiel-Coronada (Cu-Zn-Pb), and La Magdalena (Cu-Zn-Pb) in Spain. The Iberian Pyrite Belt massive sulfide ores are usually hosted in the lower sections of the volcano-sedimentary complex (late Famennian to late Visean), but they also occur in the uppermost levels of the phyllite-quartzite group at the Neves Corvo deposit, stratigraphically below the volcano-sedimentary complex. A Pb-Nd-Sr isotope dataset was obtained for 98 Iberian Pyrite Belt metapelite samples (from Givetian to upper Visean), representing several phyllite-quartzite group and volcano-sedimentary complex sections that include the footwall and hanging-wall domains of ore horizons at the Neves Corvo, Aljustrel, and Lousal mines. The combination of whole-rock Nd and Sr isotopes with Th/Sc ratios shows that the siliciclastic components of Iberian Pyrite Belt metapelites are derived from older quartz-feldspathic basement rocks (–11 ≤ εNdinitial(i) ≤ –8 and (87Sr/86Sr)i up to 0.727). The younger volcano-sedimentary complex metapelites (upper Tournaisian) often comprise volcanic-derived constituents with a juvenile isotopic signature, shifting the εNdi up to +0.2. The Pb isotope data confirm that the phyllite-quartzite group and volcano-sedimentary complex successions are crustal reservoirs for metals found in the deposits. In Neves Corvo, where there is more significant Sn- and Cu-rich mineralization, the higher (206Pb/204Pb)i and (207Pb/204Pb)i values displayed by phyllite-quartzite group and lower volcano-sedimentary complex metapelites (up to 15.66 and 18.33, respectively) suggest additional contributions to the metal budget from a deeper and more radiogenic source. The proximity to Iberian Pyrite Belt massive sulfide ore systems hosted in metapelite successions is observed when (207Pb/204Pb)i >15.60 and Fe2O3/TiO2 or (Cu+Zn+Pb)/Sc >10. These are important criteria that should be considered in geochemical exploration surveys designed for the Iberian Pyrite Belt.

Sm–Nd and Rb–Sr isotope geochemistry and petrology of Abu Hamamid intrusion, Eastern Desert, Egypt: An Alaskan-type complex in a backarc setting

2015 ◽  
Vol 258 ◽  
pp. 234-246 ◽  
Author(s):  
Hassan M. Helmy ◽  
Masako Yoshikawa ◽  
Tomoyuki Shibata ◽  
Shoji Arai ◽  
Hiroo Kagami
Keyword(s):  
Isotope Geochemistry ◽  
Eastern Desert ◽  
Sr Isotope ◽  
Type Complex

Apatites for destruction: Reference apatites from Morocco and Brazil for U-Pb petrochronology and Nd and Sr isotope geochemistry

2021 ◽  
pp. 120689
Author(s):  
FranciscoE. Apen ◽  
Corey J. Wall ◽  
John M. Cottle ◽  
Mark D. Schmitz ◽  
Andrew R.C. Kylander-Clark ◽  
...  
Keyword(s):  
Isotope Geochemistry ◽  
Sr Isotope

Nd and Sr isotope geochemistry of island arc volcanics, Grenada, Lesser Antilles

1979 ◽  
Vol 45 (2) ◽  
pp. 237-248 ◽  
Author(s):  
C.J. Hawkesworth ◽  
R.K. O'Nions ◽  
R.J. Arculus
Keyword(s):  
Isotope Geochemistry ◽  
Island Arc ◽  
Lesser Antilles ◽  
Sr Isotope
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