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    罗金海, 车自成, 周新源, 李勇, 李建立, 张敬艺. 塔里木盆地西部中生代早期伸展作用的辉绿岩证据[J]. 中国地质, 2006, 33(3): 566-571.
    引用本文: 罗金海, 车自成, 周新源, 李勇, 李建立, 张敬艺. 塔里木盆地西部中生代早期伸展作用的辉绿岩证据[J]. 中国地质, 2006, 33(3): 566-571.
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    LUO Jin-hai, CHE Zi-cheng, ZHOU Xin-yuan, LI Yong, LI Jian-li, ZHANG Jing-yi. Diabase evidence for the early Mesozoic extension in the western Tarim basin, NW China[J]. GEOLOGY IN CHINA, 2006, 33(3): 566-571.
    Citation: LUO Jin-hai, CHE Zi-cheng, ZHOU Xin-yuan, LI Yong, LI Jian-li, ZHANG Jing-yi. Diabase evidence for the early Mesozoic extension in the western Tarim basin, NW China[J]. GEOLOGY IN CHINA, 2006, 33(3): 566-571.
    shu

    塔里木盆地西部中生代早期伸展作用的辉绿岩证据

    Diabase evidence for the early Mesozoic extension in the western Tarim basin, NW China

      摘要
    • 摘要: 提要：塔里木盆地西北缘出露的辉绿岩墙的SiO2含量为44.34%~49.34%，Na2O+K2O（4.32%~6.04%）和Na2O/K2O均较高（2.23~9.15），主量元素反映板内玄武岩的特点。稀土总量较低(∑REE=35.71~ 47.95 μg/g)，(La/Yb)N高达11.66~14.77，呈轻稀土强烈富集的稀土配分型式，基本不显示明显的Eu异常，具有富集地幔源的地球化学特点。对辉绿岩的40Ar/39Ar年龄测定为235.6 Ma和203.7 Ma。结合塔里木盆地西部，特别是西邻塔吉克盆地和卡拉库姆盆地三叠—侏罗纪沉积与构造背景的综合分析表明，塔里木盆地西部三叠—侏罗纪时期是白垩纪—古近纪强烈沉降作用的前奏，主体处于伸展背景下的隆起状态。

       

      Abstract: Abstract：Diabase dikes exposed on the northwestern margin of the Tarim basin contain 44.34%－49.3% SiO2 have higher values of Na2O+K2O (4.32%–6.04%) and Na2O/K2O (2.23－9.15), showing the features of intraplate basalt. The diabase is also characterized by a lower total REE content (∑REE=35.71－47.95 μg/g) and a higher ratio of (La/Yb)N (11.66－14.77) and no pronounced Eu anomaly. The geochemistry of the diabase suggests that it was derived from enriched mantle sources. 40Ar/39Ar dating of the diabase yields ages of 235.6 and 203.7 Ma. The above-mentioned geochemical characteristics combined with an integrated analysis of the Triassic-Jurassic sedimentary and tectonic settings of the western Tarim basin, especially the Tajikistan basin and Karakumy basin west of the Tarim basin suggest that：in the Triassic-Jurassic the western Tarim basin was in a prelude stage of Cretaceous-Paleogene intense subsidence and its main part was still in an uplift stage against the general extensional setting.

       

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