Petrology and PGE Abundances of High‐Cr and High‐Al Podiform Chromitites and Peridotites from the Bulqiza Ultramafic Massif, Eastern Mirdita Ophiolite, Albania

Acta Geologica Sinica - Tập 92 Số 3 - Trang 1063-1081 - 2018
Tian Qiu1, Jingsui Yang1, Ibrahim Milushi2, Weiwei Wu3, Nezir Mekshiqi2, Fahui Xiong1, Cong Zhang1,4, Tingting Shen1
1Center for Advanced Research on the Mantle (CARMA), Key Laboratory of Deep Earth Dynamics of Ministry of Land and Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037 China
2Institute of Geosciences, Energy, Water and Environment, Polytechnic University of TIRANA, Tirana 1000 Albania
3Faculty of Earth Sciences, China University of Geoscience, Wuhan 430074 Hubei, China
4Institute of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao 266510 Shandong, China

Tóm tắt

The Bulqiza ultramafic massif, which is part of the eastern Mirdita ophiolite of northern Albania, is world renowned for its high‐Cr chromitite deposits. High‐Cr chromitites hosted in the mantle section are the crystallized products of boninitic melts in a supra‐subduction zone (SSZ). However, economically important high‐Al chromitites are also present in massive dunite of the mantle‐crust transition zone (MTZ). Chromian‐spinel in the high‐Al chromitites and dunites of the MTZ have much lower Cr# values (100Cr/(Cr+Al)) (47.7–55.1 and 46.5–51.7, respectively) than those in the high‐Cr chromitites (78.2–80.4), harzburgites (72.6–77.9) and mantle dunites (79.4–84.3). The chemical differences in these two types of chromitites are reflected in the behaviors of their platinum‐group elements (PGE). The high‐Cr chromitites are rich in IPGE relative to PPGE with 0.10–0.45 PPGE/IPGE ratios, whereas the high‐Al chromitites have relatively higher PPGE/IPGE ratios between 1.20 and 7.80. The calculated melts in equilibrium with the high‐Cr chromitites are boninitic‐like, and those associated with the high‐Al chromitites are MORB‐like but with hydrous, oxidized and TiO2‐poor features. We propose that the coexistence of both types of chromitites in the Bulqiza ultramafic massif may indicates a change in magma composition from MORB‐like to boninitic‐like in a proto‐forearc setting during subduction initiation.

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Acta Geologica Sinica

Tập 92 Số 3

1063-1081

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