Hot carbonates deep within the Chicxulub impact structure.

PNAS Nexus · 2024 · PMC10783646 · PMID 38213614

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a clear trendno p-value reported

A clear trend is visible from this region toward very low δ 18 O and δ 13 C values, which are interpreted to result from a secondary hydrothermal overprint.

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an increasing trendno p-value reported

The graded suevite sequence displays an increasing trend below 660 mbsf, followed by the non-graded suevite and impact melt rock interval that shows a decreasing downward trend with δ 18 O values down to −19‰ Vienna Peedee belemnite (VPDB) or ∼11‰ Vienna Standard Mean Ocean Water (VSMOW).

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.