Depositional characteristics and model of the deep−water debris flow of the Mid−Late Jurassic Lagongtang Formation in the Nagqu area, Tibet
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摘要:
研究目的 拉萨地块北缘中晚侏罗世拉贡塘组深水碎屑流沉积的研究，对于恢复青藏高原南部中生代构造−古地理具有重要的意义。
研究方法 笔者对出露于那曲地区的拉贡塘组碎屑流沉积进行了实地调研和显微构造分析，同时结合区域地质资料，探讨了控制因素和搬运过程，建立了沉积模式。
研究结果 该组的碎屑流沉积下部由砾质碎屑流组成，上部以砂质碎屑流与泥质碎屑流沉积交替产出为特点，其内含有丰富的滑塌、滑动体，具有典型的软沉积双重构造，其中的软沉积变形褶皱、布丁构造指示碎屑流向南流动。
结论 拉贡塘组碎屑流的形成受班公湖—怒江结合带控制，不同类型碎屑流沉积的“源−渠−汇”具有一定程度的耦合关系，对重建青藏高原南部中生代构造−古地理提供了依据。
Abstract:This paper is the result of oil and gas exploration engineering.
Objective The research of deep–water debris flow deposition of the Mid–Late Jurassic Lagongtang Formation on the northern margin of the Lhasa Block is important for the reconstruction on the Mesozoic tectonics–palaeogeography in the southern Qinghai−Tibetan Plateau.
Methods This study conducted field investigations and microstructural analyses on the debris flow deposition of the Lagongtang Formation in the Nagqu area, and discussed its controlling factors and transport processes with previous regional geological data, and further established its depositional model.
Results The lower part of the debris flow deposition consists mainly of gravelly debris flow deposits, while its upper part is characterized by sandy debris flow deposits alternating with muddy debris flow deposits, containing abundant slip collapse and sliding bodies and have a typical double structure of soft deposition. The soft depositional deformation folds and pudding structure indicate the southward flow of the debris flow.
Conclusions This study indicates that the formation of the Lagongtang Formation is controlled by the Bangonghu−Nujiang suture zone, and the "source−drain−sink" of different kinds of debris flow deposition shows coupling relationships to a certain extent. The study also provides new information on the reconstruction on the structure−paleogeography of the southern Qinghai−Tibetan Plateau in Mesozoic.
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图 1 青藏高原南部大地构造图（a）和那曲地区地质简图（b）（a，据王立全等, 2013；b，据尼玛次仁等，2014；陈玉禄等，2015）
Figure 1.
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