Textural and structural features of submarine mass density flow sediments are a record of depositional flow evolution and hydrodynamics. Record of changes in such flow movement are difficult or impossible to detect, especially in fine sediments, without quantitative grain size analysis. This study shows an automated measurement system of mineral liberation analysis MLA applied for the first time to grain size distribution. The analysis concerns heavy minerals extracted from very fine- and fine-grained sandstones of the Cergowa Beds (Lower Oligocene) in the Polish and Slovak Outer Carpathians, which macroscopically show unclear textural trends and represent deposits of steady and uniform turbidity currents, possibly initiated by hyperpycnal effluents. The MLA analysis showed that the tested material represents sediments deposited by flows with developing turbulence. Simultaneously, the study verified that a turbulence damping contributes to size-density sorting during transport and demonstrated that maximum rather than average grain size is controlled by flow concentration, therefore reflects flow hydrodynamics. Besides, MLA measurements recognised variations in flow motion recorded by three types of grain-size breaks: (i) in high-density flow when capacity-controlled conditions are changing so that high energy flow erodes the previously deposited material; (ii) at a sharp interface between high-concentration basal layer and the overriding flow with lower concentration , and (iii) at a transition between low- and high-density flows during deposition of the Bouma interval Tb or between Tb and Tc. The MLA test study appears to be promising because this method increases objectivity of large amount of data collection, therefore provides significant statistical representation. Besides, this automated system reduces human errors, bias and tedious manual analyses, thus opening new perspectives in analysis of detrital sediments and interpretation of depositional processes.

海底质量密度流沉积物的结构和结构特征是沉积流演化和流体动力学的记录。如果没有定量粒度分析，很难或不可能检测出这种流动变化的记录，尤其是在细小的沉积物中。这项研究显示了矿物释放分析MLA的自动测量系统，该系统首次应用于粒度分布。分析涉及从波兰和斯洛伐克外喀尔巴阡山脉切尔戈瓦层（下渐新世）的非常细和细粒砂岩中提取的重矿物，宏观上显示出不清晰的组织趋势，并代表了稳定且均匀的浊流沉积，可能是由以下原因引起的：肥大废水。MLA分析表明，所测试的材料代表了由于湍流发展而由水流沉积的沉积物。同时，该研究验证了湍流阻尼有助于运输过程中的尺寸密度分选，并证明了最大而不是平均的晶粒尺寸是由流动浓度控制的，因此反映了流动流体动力学。此外，MLA测量还可以识别出三种类型的晶粒尺寸断裂记录的流动运动变化：（i）当容量控制条件发生变化时，高密度流导致高能流侵蚀了先前沉积的材料；（ii）在高浓度基底层与较低浓度的上覆流之间的尖锐界面处，（iii）在Bouma间隔Tb的沉积期间或在Tb和Tc之间的低密度流和高密度流之间的过渡。MLA测试研究似乎很有希望，因为此方法可提高大量数据收集的客观性，因此可提供显着的统计表示。此外，该自动化系统减少了人为错误，偏见和繁琐的人工分析，从而为碎屑沉积物的分析和沉积过程的解释开辟了新的视角。