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以29口钻孔的重矿物百分含量数据来分析样本,通过Q型聚类分析、因子分析方法恢复不同物源体系的发育范围及其母岩类型,并以不同物源体系的边界范围为限定条件,结合ZTR指数及其等值线图,对珠江口盆地惠州凹陷M层物源特征进行了系统的研究。研究结果表明:研究区发育3大物源沉积区,分别为东北—北部物源沉积区、西北物源沉积区和东南物源沉积区,且各区重矿物组合特征明显,主次物源分明,整体表现为母岩类型复杂的特征。东北—北部沉积物主要母岩为酸性岩浆岩,次要母岩为变质岩和沉积岩;西北沉积物主要母岩为中性及基性岩浆岩,次要母岩为酸性岩浆岩和变质岩;东南沉积物主要母岩为中性及基性岩浆岩,次要母岩为变质岩。东北—北部物源区和西北物源区为远源沉积的产物,而东南物源区为近源沉积的产物。东北—北部物源区沉积物来自北方和东北方向,而西北物源区和东南物源区沉积物分别来自西北方向和东南方向。
Based on the data of percentage of heavy minerals in 29 boreholes, the samples were analyzed by Q-type cluster analysis and factor analysis method to recover the developmental range and parent rock types of different provenance systems. The range of boundary of different provenance systems was According to the ZTR index and its contour map, the source characteristics of M layer in Huizhou Depression of the Pearl River Mouth Basin were systematically studied. The results show that there are three major source sedimentary areas in the study area, namely the northeastern-northern source sedimentary region, the northwest source sedimentary region and the southeast source sedimentary region, and the heavy mineral assemblages in each region are distinct with distinct primary and secondary sources and the whole The performance of the complex types of parent rock features. The main parent rocks in the northeast-northern sediments are acidic magmatic rocks, the minor parent rocks are metamorphic rocks and sedimentary rocks, the main parent rocks in the northwest sediments are neutral and basic magmatic rocks, and the minor parent rocks are acidic magmatic rocks and metamorphic rocks. The main parent rocks in the southeastern sediments are neutral and basic magmatic rocks, and the minor parent rocks are metamorphic rocks. The northeastern-northern source region and the northwest source region are the products of distant source deposition, while the southeast source region is the product of near source deposition. The sediments of northeastern-northern source areas come from north and northeast, while the sediments from northwest source areas and southeast source areas come from northwest and southeast respectively.