Changing Hydrocarbon-Producing Potential of the Cambrian Niutitang Shale: Insights from Pyrite Morphology and Geochemical Characteristics.

10 , 11 Therefore, disturbed authigenic pyrite is the main mineral form of sulfide in marine sediments, and its formation process is usually accompanied by diagenetic processes such as organic matter mineralization, iron oxide reduction, and sulfate reduction, and its morphological characteristics, 13 framboids size, 14 and sulfur isotope 15 , 16 have strong indicative significance for the reconstruction of the sedimentary environment.

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14 , 42 , 43 The box-and-whisker diagram of the upper shale of the Niutitang Formation (N1-4) has a larger maximum framboid pyrite grain size distribution (maximum >25 μm) and a smaller minimum framboid pyrite grain size (3.5 μm), with a decreasing trend.

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