Paleoenvironmental Evolution Characteristics and Mineral Enrichment Patterns of the Lacustrine System Under Orbital Forcing in the Yin'e Basin During the Early Cretaceous

The samples cover the entire first member of the Bayingebi Formation (total thickness: 189 m). Specific grouping: 26 samples were prepared as thin sections for microscopic and scanning electron microscope (SEM) observations; 71 samples were analyzed for mineral composition using X-ray diffraction (XRD); 51 mudstone and marlstone samples were selected for determinations of total organic carbon (TOC), organic carbon isotope (δ¹³C), and nitrogen isotope (δ¹⁵N); while 20 high-organic-content mudstone samples were used for biomarker analysis via gas chromatography-mass spectrometry (GC-MS); and 369 samples were subjected to chromaticity and magnetic susceptibility (MS) measurements.

本次研究所用样品覆盖巴音戈壁组一段（Bayingebi Formation）的全部地层，总厚度达189米。具体实验分组如下：制备26件薄片样品用于显微观测及扫描电子显微镜（scanning electron microscope, SEM）分析；选取71件样品通过X射线衍射（X-ray diffraction, XRD）测定矿物组成；挑选51件泥岩与泥灰岩样品，开展总有机碳（total organic carbon, TOC）、有机碳同位素（δ¹³C）及氮同位素（δ¹⁵N）测试；另有20件高有机质含量泥岩样品，采用气相色谱-质谱联用（gas chromatography-mass spectrometry, GC-MS）技术进行生物标志物分析；此外还对369件样品进行色度与磁化率（magnetic susceptibility, MS）测定。