The Salt Range, in Pakistan, preserves an insightful sedimentary record of passive margin dynamics along the NW margin of the Indian Plate during the Mesozoic. This study develops provenance analyses of the Upper Triassic (Kingriali Formation) to Lower Jurassic (Datta Formation) siliciclastics from the Salt and Trans Indus ranges based on outcrop analysis, petrography, bulk sediment elemental geochemistry, and heavy-mineral data. The sandstones are texturally and compositionally mature quartz arenites and the conglomerates are quartz rich oligomictic conglomerates. Geochemical proxies support sediment derivation from acidic sources and deposition under a passive margin setting. The transparent heavy mineral suite consists of zircon, tourmaline, and rutile (ZTR) with minor staurolite in the Triassic strata that diminishes in the Jurassic strata. Together, these data indicate that the sediments were supplied by erosion of the older siliciclastics of the eastern Salt Range and adjoining areas of the Indian Plate. The proportion of recycled component exceeds the previous literature estimates for direct sediment derivation from the Indian Shield. A possible increase in detritus supply from the Salt Range itself indicates notably different conditions of sediment generation, during the Triassic–Jurassic transition. The present results suggest that, during the Triassic–Jurassic transition in the Salt Range, direct sediment supply from the Indian Shield was probably reduced and the Triassic and older siliciclastics were exhumed on an elevated passive margin and reworked by a locally established fluvio-deltaic system. The sediment transport had a north-northwestward trend parallel to the northwestern Tethyan margin of the Indian Plate and normal to its opening axis. During the Late Triassic, hot and arid hot-house palaeoclimate prevailed in the area that gave way to a hot and humid greenhouse palaeoclimate across the Triassic–Jurassic Boundary. Sedimentological similarity between the Salt Range succession and the Neo-Tethyan succession exposed to the east on the northern Indian passive Neo-Tethyan margin suggests a possible westward extension of this margin.

中文翻译：

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Kingriali 和 Datta 组（三叠纪-侏罗纪过渡）的多代理物源分析：新特提斯被动边缘从盐区向西延伸的证据（巴基斯坦）

位于巴基斯坦的盐岭保留了中生代沿印度板块 NW 边缘的被动边缘动力学的深刻沉积记录。本研究基于露头分析、岩石学、大块沉积物元素地球化学和重矿物数据，对盐分和跨印度河山脉的上三叠统（Kingriali 组）至下侏罗统（Datta 组）硅质碎屑进行物源分析。砂岩是结构和成分成熟的石英砂岩，砾岩是富含石英的低聚砾岩。地球化学代理人支持在被动边界条件下从酸性源沉积和沉积。透明的重矿物组由锆石、电气石和金红石 (ZTR) 组成，三叠纪地层中的少量星石柱石在侏罗纪地层中减少。总之，这些数据表明沉积物是由东部盐区和印度板块相邻地区较老的硅质碎屑的侵蚀作用提供的。再循环成分的比例超过了之前文献对印度地盾直接沉积物衍生的估计。盐区本身的碎屑供应可能增加，表明在三叠纪-侏罗纪过渡期间沉积物的生成条件明显不同。目前的结果表明，在盐区三叠纪-侏罗纪过渡期间，来自印度地盾的直接沉积物供应可能减少，三叠纪和更老的硅质碎屑在升高的被动边缘被挖掘出来，并被当地建立的河流-三角洲系统改造. 沉积物运移呈北西北向平行于印度板块西北特提斯边缘并垂直于其开口轴的趋势。在晚三叠世期间，该地区盛行炎热干燥的温室古气候，让位于横跨三叠纪-侏罗纪边界的炎热潮湿的温室古气候。在印度北部被动新特提斯边缘，向东暴露的盐范围演替和新特提斯演替之间的沉积学相似性表明，该边缘可能向西扩展。