Melt migration and upper mantle evolution during incipient arc construction: Jurassic Eastern Mirdita ophiolite, Albania
Melt migration and upper mantle evolution during incipient arc construction: Jurassic Eastern Mirdita ophiolite, Albania
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DOI：
10.1111/j.1440-1738.2009.00692.x
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发表时间：
2009-12
期刊：
影响因子：
1.5
通讯作者：
Y. Dilek;T. Morishita
中科院分区：
文献类型：
--
作者：
Y. Dilek;T. Morishita
保存完好的俯冲带（SSZ）蛇绿岩为研究弧前岩石圈的地壳和上地幔结构、组成及其时空演化提供了天然实验室。 SSZ 蛇绿岩的结构结构和地球化学指纹呈现了前洋盆俯冲起始后多次融化的快照（Dilek & Furnes 2009）。我们研究了阿尔巴尼亚侏罗纪 Mirdita 蛇绿岩中的地壳和地幔单元（图 1），以记录 SSZ 洋壳形成过程中熔体生成的岩浆、交代和构造过程的模式和性质以及它们之间的相互作用。 Mirdita 蛇绿岩出现在一条近 40 公里宽的带中，该带以普利亚（西）和佩拉戈尼亚（东）微大陆的共轭被动边缘序列为界（图1）。西部的镁铁质-超镁铁质地块（即Krabbi、Puka、Gomsiqe）主要由二辉橄榄岩和斜长二辉橄榄岩组成，而东部的镁铁质-超镁铁质地块（即Kukes、Lura、Bulqize）则含有方镁铁矿和纯橄榄岩，并含有主要的铬铁矿矿床（图2a）。这
Well-preserved suprasubduction zone (SSZ) ophiolites provide a natural laboratory to investigate crustal and upper mantle structure and composition of arc–forearc lithosphere, and its spatial and temporal evolution. The structural architecture and geochemical fingerprint of SSZ ophiolites present a snapshot of multiple episodes of melting following subduction initiation in former ocean basins (Dilek & Furnes 2009). We have studied the crustal and mantle units in the Jurassic Mirdita ophiolite in Albania (Fig. 1) to document the mode and nature of magmatic, metasomatic, and tectonic processes of melt generation and their interplay during formation of SSZ oceanic crust.The Mirdita ophiolite occurs in a nearly 40-kmwide belt bounded by the conjugate passive margin sequences of the Apulia (west) and Pelagonia (east) microcontinents (Fig. 1). Mafic–ultramafic massifs in the west (ie Krabbi, Puka, Gomsiqe) consist mainly of lherzolite and plagioclase lherzolite, whereas those in the east (ie Kukes, Lura, Bulqize) contain harzburgite and dunite with major chromite deposits (Fig. 2a). The