侧影显露
Of sediment color a value lower profile and higher total organic carbon and black shales with marine planktonic environment for the emergence of direction was the reduction of marine hypoxia conditions.
研究剖面沉积物色度a值降低和总有机碳增高以及含海相浮游有孔虫黑色页岩的出现指示当时环境为海相缺氧的还原条件。
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