Fig. 5 | Scientific Reports

Fig. 5

From: Spongy-looking microfabrics in the earliest named stromatolite represent deep burial alteration and incipient metamorphism

Fig. 5

Crystallographic orientation data of a spongy-looking microfabric, U–Pb dating. (A) Crystallographic orientation analysis of two neighboring domains, from fine-crystalline carbonate (M) into interlobate-granoblastic spar (AL). White spots indicate non-calcite mineralogy. (B) Indistinct preferred orientation in pole figures of the entire area with strong bias induced by the few largest grains. (C) Haphazard orientation in pole figures of the entire area after excluding the few largest grains. From hypotype thin-section NYSM 6508.1. (D, E) Tera-Wasserburg isochron plots; uncertainty ellipses represent 2σ; MSWD = mean square of weighted deviates; arrows indicate potential open system behavior52. (D) From fine-crystalline domain; (E) from spar-rich (interlobate-granoblastic) domain (hypotype NYSM 6508.1).

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