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Platinum-group elements for the kudi ophiolite, western Kunlun

Chinese Science Bulletin 2000年第6期45卷 551-556页

作者： Zhihong Wang Quanlin Hou Jiliang Li Haihong Chen Chinese Acad Sci Inst Geol & Geophys Lab Lithosphere Tecton Evolut Beijing 100029 Peoples R China

The analyses of PGE characteristics for the kudi ophiolite, western Kunlun, are reported in this note. The Ir-depleted anomalous ancient upper mantle represented by the kudi mantle peridotites had been percolated and mixed by remelted oceanic crust material from a supra-subduction zone, leaving the rocks relatively enriched in Pd. The PGE contents in the kudi cumulate pyroxenites and gabbros vary from 2.4 to 23.94 ng/g, and the highest values are in pyroxenites. The Pd/lr ratios increase from the pyroxenites to the gabbros. The PGE patterns for the kudi cumulate rocks are steeply positively sloped. The Pd enrichment in these rocks is similar to that in pyroxenites from the Thetford ophiolite and the Troodos ophiolite. The kudi diabase and basalts have low PGE contents and positively sloped PGE patterns, and are comparable with the upper pillow lava?from the Troodos ophiolite, indicative of the environment of back-arc spreading center in a supra-subduction zone.

关键词： platinum-group elements supra-subduction zone kudi ophiolite western Kunlun.

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Arc-ophiolite obduction in the Western Kunlun Range(China):implications for the Palaeozoic evolution of central Asia

Arc-ophiolite obduction in the Western Kunlun Range(China):i...

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中国科学院地质与地球物理研究所2002学术年会

作者： BRIAN F.WINDLEY Department of Geology University of Leicester Department of Earth & Planetary Sciences Tokyo Institute of TechnologyO-okayama 2-12-1MeguroTokyo 152-8511Japan

The nature of the"kudi ophiolite"in the Western Kunlun Range is hotly *** new structural-geochemical data reveal that it is actually an arc-ophiolite comprising:(1) arc/ophiolite-derived turbidites of two generations containing Late Ordovician-Silurian and Late Devonian-Early Carboniferous radiolaria;(2) a central intra-oceanic(Yixieke) arc with basalt-andesite-tuff-agglomerate;(3) lower(Buziwan) oceanic crust containing *** propose the following tectonic ***-dipping subduction in the Late Cambrian to earliest Ordovician generated the Yixieke arc on top of the Buziwan oceanic *** subduction led to emplacement of the arc northwards onto the North Kunlun terrane(Tarim block),creating an active continental margin with northward subduction below *** kudi ophiolite was thrust southeastward over the incoming kudi continental(gneiss) terrane in the mid-Ordovician/*** a tectonic hiatus in the kudi region Late Devonian-Carboniferous subduction further west led to the Oytag arc formerly regarded as an equivalent of the kudi *** Permian arc lavas and Late Triassic granites in the Xiananqiao arc south of kudi mark the resumption of north-dipping subduction before final collision with the incoming Qiangtang *** with the Lapeiquan ophiolite in the Eastern Kunlun assists regional correlation along this Palaeozoic orogen and constrains Cenozoic displacement of the Altyn Tagh fault.

关键词： kudi arc-ophiolite obduction Andean-type orogen Western Kunlun Range

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