Petrology and geochemistry of high Cr# podiform chromitites of Bulqiza, Eastern Mirdita Ophiolite (EMO), Albania

Xiong, Fahui; Yang, Jingsui; Robinson, Paul T.; Dilek, Yıldırım; Milushi, Ibrahim; Xu, Xing; Chen, Yanhong; Zhou, Wenda; Zhang, Zhongming; Lai, Shengming; Tian, Ye; Zhu, Hao

doi:10.1016/j.oregeorev.2015.04.011

Cited by 26 publications

(17 citation statements)

References 89 publications

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“…These findings are clearly indicating the origin of these elements from local mineral dust particles associated with different geochemical origin. The origin of these elements from different bedrock formations is in the same line with the Albanian geological settings (Hoeck et al, 2005;Xiong et al, 2015;Bortolotti et al, 2015). Fig.…”

Section: Major Elementssupporting

confidence: 70%

Origin and spatial distribution of metals in moss samples in Albania: A hotspot of heavy metal contamination in Europe

et al. 2018

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Section: Major Elementssupporting

confidence: 70%

Origin and spatial distribution of metals in moss samples in Albania: A hotspot of heavy metal contamination in Europe

et al. 2018

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“…They are composed of a very refractory olivine-spinel assemblage, in agreement with a boninitic parentage ( Fig. 8a, 8b; Xiong et al, 2015b). The harzburgites and dunites samples from Bulqiza ophiolite appear to be impregnated by boninitic melts, from which the Bulqiza chromitites precipitated.…”

Section: Evolution Of the Bulqiza Ophiolitementioning

confidence: 56%

“…Two major types of chromitites, massive and disseminated, are recognized in Bulqiza (Xiong et al, 2015b). Massive chromitite typically forms discontinuous layers, 0.5 to 1 m thick or irregular masses up to 20 m thick.…”

Section: Geological Settingsmentioning

confidence: 99%

Diamonds Discovered from High–Cr Podiform Chromitites of Bulqiza, Eastern Mirdita Ophiolite, Albania

Xiong

Yang

Robinson

et al. 2017

Acta Geologica Sinica (Eng)

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Various combinations of diamond, moissanite, zircon, corundum, rutile and titanitehave been recovered from the Bulqiza chromitites. More than 10 grains of diamond have been recovered, most of which are pale yellow to reddish–orange to colorless. The grains are all 100–300 μm in size and mostly anhedral, but with a range of morphologies including elongated, octahedral and subhedral varieties. Their identification was confirmed by a characteristic shift in the Raman spectra between 1325 cm−1 and 1333 cm−1, mostly at 1331.51 cm−1 or 1326.96 cm−1. This investigation extends the occurrence of diamond and moissanite to the Bulqiza chromitites in the Eastern Mirdita Ophiolite. Integration of the mineralogical, petrological and geochemical data of the Bulqiza chromitites suggests their multi–stage formation. Magnesiochromite grains and perhaps small bodies of chromitite formed at various depths in the upper mantle, and encapsulated the ultra–high pressure, highly reduced and crustal minerals. Some oceanic crustal slabs containing the magnesiochromite and their inclusion were later trapped in suprasubduction zones, where they were modified by tholeiitic and boninitic arc magmas, thus changing the magnesiochromite compositions and depositing chromitite ores in melt channels.

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“…The Al 2 O 3 and Y contents of the Skenderbeu harzburgites show negative correlations with MgO contents (Figure 4). In detail, it is noticeable that the Skenderbeu harzburgites are similar to abyssal harzburgites formed in the mid-ocean ridge and similar to Gomsiqe harzburgites formed in the forearc spreading center [24] but distinguishable from the Bulqiza harzburgites that formed in a suprasubduction zone mantle wedge [29].…”

Section: Whole-rock Major and Trace Element Composition Analysesmentioning

confidence: 87%

Diamonds Discovered in the Forearc Harzburgites Hint at the Deep Mantle Source of the Skenderbeu Massif, Western Mirdita Ophiolite

Wu,

Yang,

Yang

et al. 2023

Minerals

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The ultra-deep genesis of ophiolitic peridotite has reshaped our perception of the genesis of the oceanic mantle. Although ultra-high pressure (UHP) mineral assemblages have been unearthed in dozens of ophiolites in different orogenic belts around the world, the vast majority of them have been limited to podiform chromitites formed in suprasubduction zone (SSZ) settings, leaving uncertainty about whether such UHP minerals are intrinsic to the oceanic mantle or influenced by a specific mantle rock type. Here, we report on the occurrence of diamonds recovered from the harzburgites within the Skenderbeu massif, Mirdita ophiolite. The whole-rock, mineralogical major and trace element compositions, and redox states of the harzburgites align with modern abyssal harzburgites. Trace element modeling of clinopyroxene indicates that harzburgites have endured varying degrees of garnet-facies melting (~2%–5%) before progressing to spinel-facies melting (~10%–12%). Mineralogical characteristics further support that the Skenderbeu harzburgites underwent late-period MORB-like melt metasomatism in a forearc spreading center. An unusual mineral assemblage of diamonds has been separated from the studied harzburgites. The first occurrence of ophiolite-hosted diamonds discovered in the forearc harzburgites, together with previous similar discoveries in the SSZ ophiolitic chromitites, suggest that the ophiolite-hosted diamonds are not specific to certain mantle rocks.

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Petrology and geochemistry of high Cr# podiform chromitites of Bulqiza, Eastern Mirdita Ophiolite (EMO), Albania

Cited by 26 publications

References 89 publications

Origin and spatial distribution of metals in moss samples in Albania: A hotspot of heavy metal contamination in Europe

Origin and spatial distribution of metals in moss samples in Albania: A hotspot of heavy metal contamination in Europe

Diamonds Discovered from High–Cr Podiform Chromitites of Bulqiza, Eastern Mirdita Ophiolite, Albania

Diamonds Discovered in the Forearc Harzburgites Hint at the Deep Mantle Source of the Skenderbeu Massif, Western Mirdita Ophiolite

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