Precise radiolarian age constraints on the timing of ophiolite generation and sedimentation in the Dazhuqu terrane, Yarlung–Tsangpo suture zone, Tibet
Precise radiolarian age constraints on the timing of ophiolite generation and sedimentation in the Dazhuqu terrane, Yarlung–Tsangpo suture zone, Tibet
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DOI：
10.1144/0016-764902-107
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发表时间：
2003-07
影响因子：
2.7
通讯作者：
S. Ziabrev;J. Aitchison;A. Abrajevitch;Badengzhu;Aileen M. Davis;Hui Luo
中科院分区：
文献类型：
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作者：
S. Ziabrev;J. Aitchison;A. Abrajevitch;Badengzhu;Aileen M. Davis;Hui Luo
保存完好的大量放射虫为西藏南部雅鲁藏布缝合带沿线暴露的蛇绿玄武岩的喷发时间提供了高精度的生物地层学年龄限制。大竹渠地体蛇绿岩形成于大洋上俯冲带中，形成于巴雷米世晚期至阿普提斯晚期的较短(<；10 Ma)的时间间隔内。在新生成的蛇绿岩上堆积的沉积物最初发生在与各种扩张中心相关的一系列离散的裂谷控制子盆地中。弧源火山碎屑沉积物上部通量的增加指示了附近的火山弧活动。大竹曲地体发育在特提斯内部的洋内环境中，在那里它与任何大陆影响隔绝。
Well-preserved, abundant radiolarians provide high-precision biostratigraphic age constraints on the timing of the eruption of ophiolitic basalts exposed along the Yarlung–Tsangpo suture zone in southern Tibet. Dazhuqu terrane ophiolites were generated in an intra-oceanic supra-subduction zone setting within a relatively short (<10 Ma) interval from late Barremian to late Aptian. Accumulation of sediments upon the newly generated ophiolite initially occurred in a series of discrete rift-controlled sub-basins associated with various spreading centres. An increasing flux of arc-derived volcaniclastic sediment up-section indicates nearby volcanic arc activity. The Dazhuqu terrane developed in an intra-oceanic setting within Tethys where it was isolated from any continental influence.