Initially, the TI shows a decreasing trend, and in the section that shows the response to the T-OAE, it displays in increasing, a decreasing, and then an increasing trend (trend 2 to 4 of the TI).
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Paleosedimentary environmental reconstruction and mechanisms of the response to the Toarcian OAE in a lacustrine shale system.
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The sentences
Our data show that the δ 13 C org values of the Da’anzhai shale exhibit five obvious trends, and the data first show a negative trend (2950. 53–2958.21 m, trend 1 of δ 13 C org ) and then a fluctuation from 2938.35 to 2949.78 m (trend 2 of δ 13 C org ).
The z value indicates the significance of the trend, with an absolute value greater than 1.96 (or 2.58) indicating a significant trend.