期刊
GONDWANA RESEARCH
卷 23, 期 2, 页码 666-681出版社
ELSEVIER
DOI: 10.1016/j.gr.2012.04.012
关键词
West Junggar; Peperite; Lava flow-sediments interaction; Continuous stratigraphic section; Remnant ocean basin
资金
- State Science and Technology Major Project [2011ZX05009-001]
- Natural Sciences Foundation of China [40972147]
- China Scholarship Council [2011601122]
Late Paleozoic peperites have been identified for the first time at the bottom of Tailegula Formation in West Junggar, China. This finding is significant for the reconstruction of Late Paleozoic evolution in the Junggar region. The peperites form successions up to 500 m thick interbedded with basaltic lava and sedimentary rocks. Four types of peperites are described and interpreted as resulting from basaltic lava bulldozed into wet, unconsolidated sediments at their basal contacts. Zircon LA-ICP-MS U-Pb dating of a tuff lens enclosed by lava showed that the peperites formed in the Late Devonian (ca. 364 Ma). The peperite-bearing units probably formed at a water depth of less than 3 km and are generally undeformed, occurring in continuous stratigraphic sections distributed regionally over a distance of 100 km on either side of the Darbut and Baijiantan ophiolitic belts, in contrast to the highly deformed slices of ophiolite. They demonstrate that the Darbut and Baijiantan ophiolitic belts should not be interpreted as significant plate boundaries and represent the underlying ocean crust uplifted along tectonic lineaments within a continuous shallow remnant ocean basin. The peperites formed during the spreading phase of the remnant ocean basin and represent the final stages of creation of oceanic crust. (C) 2012 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
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