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首页> 外文期刊>Nature >STRATIGRAPHIC EVIDENCE FOR AN EARLY COLLISION BETWEEN NORTHWEST INDIA AND ASIA
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STRATIGRAPHIC EVIDENCE FOR AN EARLY COLLISION BETWEEN NORTHWEST INDIA AND ASIA

机译：西北印度与亚洲早期碰撞的地层证据

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摘要

THE collision of India with Asia(1) had a profound influence on late Cretaceous and Cenozoic oceanography(2), climate(3), faunal extinctions(4) and the motion of at least some of the Earth's lithospheric plates(5). As the collision ended a period of rapid Indo-Asian convergence, a precise knowledge of its timing (when the crust of the neo-Tethys ocean was completely subducted(7), at some point along the plate boundary) is important for understanding its wider consequences, But current estimates of the collision age range from 65 to 38 Myr before present(6,8-11), Here we report the results of extensive biostratigraphic analyses from Waziristan and Kurram in northwest Pakistan, which show that accretionary-prism and trench strata Were first thrust onto the northwest Indian passive margin after 66 Myr but before 55.5 Myr. After this time, volcanic-are fragments, the accretionary prism, trench material and imbricates of the north Indian slope were raised to shallow water depths and overlapped by upper Palaeocene shallow-water carbonates and shales(12-14), indicative of post-collision thrusting in this region. Finally, both the suture and the Indian craton were overlapped by continuous unconformable upper Lower Eocene shallow-marine strata, demonstrating that suturing was complete by 49 Myr. [References: 70]
机译：印度与亚洲的碰撞（1）对晚白垩世和新生代海洋学（2），气候（3），动物灭绝（4）以及至少一些地球岩石圈板块的运动（5）产生了深远的影响。由于碰撞结束了印度-亚洲快速融合的时期，因此，准确了解其时机（当新特提斯洋的地壳被完全俯冲（7），沿着板块边界的某个点时）对于了解其范围更为重要。后果，但是目前对撞机年龄的估计范围是目前的65至38 Myr（6,8-11），这里我们报告了巴基斯坦西北部Waziristan和Kurram进行的广泛的生物地层分析结果，表明了增生棱镜和沟槽地层在66 Myr之后但在55.5 Myr之前首先被推到西北印度洋被动缘。此后，北印度洋斜坡的火山碎屑，增生棱柱，沟渠材料和胶结物被抬升至浅水深度，并与上古新世上部浅水碳酸盐岩和页岩重叠（12-14），表明发生了碰撞后推向这个区域。最终，缝合线和印度克拉通都被连续的不整合的下始新统浅海浅层地层重叠，表明缝合已完成了49 Myr。 [参考：70]

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