The southern Kachchh Mainland (SKM) of western India, situated in a seismically active intraplate region with a considerable Quaternary landscape, provides an opportunity to reconstruct the roles of climate and tectonics. Employing geomorphology, detailed sedimentology supported by geochemistry and optical dating, we integrate the fluvial to fluvio‐marine records to evaluate the potential of dryland environments in archiving the palaeo‐events. The climate reconstructions suggest that the fluvial systems have responded to the variations in monsoonal strength through widespread aggradation during 57 until 41 ka, corresponding to the later part of the MIS‐3. Following this, a relative weakening of monsoon and onset of aridity is observed between 28 and 11 ka, with short spells of enhanced monsoon. The monsoonal conditions again strengthened during 11 to 6 ka, reaching its maximum during the Early Holocene optima, which triggered a sea‐level rise during the Middle Holocene period, that is, 6 to 3 ka. Following this, the sequences incised in response to the relative sea‐level fall to the present level in post 3 ka. We have also employed this OSL ages to reconstruct the phases of aggradation and incision of valley fill sediments/estuarine tidal terraces from the SKM during the last 57 ka. The present study illustrates and contributes to the advancement in understanding of complex processes and their influence on climatic/tectonic signals in dryland landscape as well as their decoupling.

中文翻译：

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从印度西部南卡赫赫大陆的旱地河流景观重建晚第四纪古环境变化：来自新的OS​​L和沉积学数据集的见解

印度西部的南部Kachchh大陆（SKM）处于地震活跃的板内区域，具有大量第四纪景观，为重建气候和构造的作用提供了机会。利用地貌学，地球化学和光学测年支持的详细沉积学，我们将河流记录与河流海洋记录相结合，以评估旱地环境在存档古事件中的潜力。气候重建表明，河流系统通过在57到41 ka期间的广泛凝集对季风强度的变化做出了响应，这对应于MIS-3的后期。此后，在28至11 ka之间观察到季风相对减弱和干旱发作，短时增强了季风。季风条件在11至6 ka期间再次加强，达到了全新世初期的最佳水平，这在全新世中期触发了海平面上升，即6至3 ka。在此之后，响应于相对海平面而切开的序列在第3 ka后下降到目前的水平。我们还利用了OSL的这个年龄，以重建了最后57 ka期间SKM的谷底沉积物/河口潮汐阶地的凝结和切开阶段。本研究说明并促进了对复杂过程及其对旱地景观中的气候/构造信号的影响及其解耦的理解。在此之后，响应于相对海平面而切开的序列在第3 ka后下降到目前的水平。我们还利用了OSL的这一年龄，以重建了最后57 ka期间SKM的谷底沉积物/河口潮汐阶地的凝结和切开阶段。本研究说明并促进了对复杂过程及其在旱地景观中对气候/构造信号的影响及其解耦的理解。在此之后，响应于相对海平面而切开的序列在第3 ka后下降到目前的水平。我们还利用了OSL的这一年龄，以重建了最后57 ka期间SKM的谷底沉积物/河口潮汐阶地的凝结和切开阶段。本研究说明并促进了对复杂过程及其对旱地景观中的气候/构造信号的影响及其解耦的理解。