Geochemistry of Chromitites in Eastern Part of Neyriz Ophiolite Complex (Southern Iran)

• 作者: Kamal Nouri Khankahdani Mehrdad Karimi Mohammad Yazdi Pedram Attarzadeh
• 来源期刊: 地质学期刊(英文)
• 学科: 地球科学
• 关键词: OPHIOLITE Podiform CHROMITE Neyriz Iran
• 年，卷（期）: dzxqkyw_2017,（3）
• 页码范围: 213-233
• 页数: 21页
• 分类号: P5

摘要

The Neyriz ophiolite complex is a part of NW-SE thrust belt (Late Cretaceous) of Iran, which is over the Arabian plate margin. The complex is mainly composed of the upper mantle rocks. Our research was focused on the eastern part of Neyriz ophiolite complex so called as “Dowlat Abad-Tang e Hana”. Mantle sequence of this ophiolitic complex is comprising predominantly of harzburgite and minor lherzolite, dunitc sheaths and chromite pods. Harzburgite is the most abundant ultramafic rock and is associated with the less dunite masses. The chromites are known with Cr# 42 to 76 and Mg# 73 to 89. There is a negative correlation between Cr#-Mg# which is one of the features of podiform chromites. The geochemistry of these chromites is consistent with the overall composition of podiform chromites in terms of Cr#, Mg#, the amounts of Cr2O3 (13.35% - 54.47%), Al2O3 (0.43% - 8%), MgO (13.25% - 38.56%), TiO2 (0.003% - 0.206%) as well as the correlations between various oxides and all of them are high chromium types.