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<p>This study presents a comprehensive review of the Late Miocene climatic history in the Tarim Basin, focusing on the significant role of the convergence and subsequent uplift of the Pamir and South Tianshan ranges. By integrating magnetic records from basin sedimentation, geological observations, and simulations, we delineate dramatic changes in the regional climate and their correlation with the uplift of the Tibetan Plateau, Pamir and Tianshan ranges. Our findings indicate that the Pamir-South Tianshan convergence area experienced a relatively cold and dry climate around 7&#xa0;Ma, as suggested by color reflectance data. Variations in magnetic susceptibility and sediment accumulation rates pinpoint the initial convergence between the northeastern Pamir and the South Tianshan to approximately 7.5<b>–</b>7.3&#xa0;Ma. From ~ 9.0 to 6.0&#xa0;Ma, a significant contribution from the Pamir to the Sankeshu Section is observed, coinciding with the northward propagation of the range. These collective datasets provide robust constraints on the timing of the convergence between the Pamir and southern Tianshan. We conclude that the major decrease in moisture influx transported by the westerlies, resulting from the convergence and subsequent uplift of these mountain ranges, was the primary driver of aridification in the Tarim Basin during the Late Miocene. This study sheds new light on the complex interplay between tectonic activity and climate change in the Asian interior, offering valuable insights into the paleoclimatic evolution of the region.</p>

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Basin magnetic signature of Pamir-Tianshan uplift and Late Miocene aridification in Central Asia

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Qingqing Qiao,
  • John D. A. Piper,
  • Sunyi Dong,
  • Shibin Liao

摘要

This study presents a comprehensive review of the Late Miocene climatic history in the Tarim Basin, focusing on the significant role of the convergence and subsequent uplift of the Pamir and South Tianshan ranges. By integrating magnetic records from basin sedimentation, geological observations, and simulations, we delineate dramatic changes in the regional climate and their correlation with the uplift of the Tibetan Plateau, Pamir and Tianshan ranges. Our findings indicate that the Pamir-South Tianshan convergence area experienced a relatively cold and dry climate around 7 Ma, as suggested by color reflectance data. Variations in magnetic susceptibility and sediment accumulation rates pinpoint the initial convergence between the northeastern Pamir and the South Tianshan to approximately 7.5–7.3 Ma. From ~ 9.0 to 6.0 Ma, a significant contribution from the Pamir to the Sankeshu Section is observed, coinciding with the northward propagation of the range. These collective datasets provide robust constraints on the timing of the convergence between the Pamir and southern Tianshan. We conclude that the major decrease in moisture influx transported by the westerlies, resulting from the convergence and subsequent uplift of these mountain ranges, was the primary driver of aridification in the Tarim Basin during the Late Miocene. This study sheds new light on the complex interplay between tectonic activity and climate change in the Asian interior, offering valuable insights into the paleoclimatic evolution of the region.