Variability of carbonate diagenesis in equatorial Pacific sediments deduced from radiogenic and stable Sr isotopes

Calcium isotopic evidence for rapid recrystallization of bulk marine carbonates and implications for geochemical proxies

“…In fact, consideration of advection (for which there is ample evidence) results in more reasonable conclusions: (1) that reaction rates at 1171A are higher than those at 1170A and 807A, and (2) that the K Sr value is consistent across a variety of sites. Recognizing the impact of advection on the interpretation of recrystallization rates is crucial, and points out a potential pitfall that can arise when modeling pore fluid Sr concentration data only and not the 87 Sr/ 86 Sr data (e.g., Voigt et al, 2015).…”

Evidence for stable Sr isotope fractionation by silicate weathering in a small sedimentary watershed in southwestern Taiwan

“…A higher carbonate precipitation rate results in larger fractionation between the carbonate and parent solution, with a lower d 88 Sr value in carbonate compared with the parental solution (Bö hm et al, 2012). Additionally, the preferential lost of 88 Sr by carbonate recrystallization during diagenesis may lower d 88 Sr value in carbonate fraction of the host rocks (Voigt et al, 2015). The combination of these mechanisms implies that the low d 88 Sr values in carbonate fraction of the solid phase are a common phenomenon in nature.…”

“…This fractionation topic may provide complementary information concerning paleothermometer (Fietzke and Eisenhauer, 2006;Rü ggeberg et al, 2008;Stevenson et al, 2014), paleoenvironmental changes (Ohno et al, 2008;Raddatz et al, 2013;Vollstaedt et al, 2014), planetary evolution and magmatic processes (Charlier et al, 2012), precipitation rates of inorganic calcite (Bö hm et al, 2012), migration pathways of deep fluids (Chao et al, 2013), recrystallization of marine carbonates (Voigt et al, 2015) and trophic levels and paleodietary information (Knudson et al, 2010). The value of d 88 Sr (refer to Eq.…”

Diagenetic alteration in low-Mg calcite from macrofossils: a review

“…Con tam ina tion ef fects and diagenetic flu ids car ry ing a sil i cate-de rived d (Vollstaedt et al, 2014: ta ble 1). A study explor ing diagenetic ef fects on this iso tope sys tem in pore wa ters and car bon ates from sites of IODP ex pe di tion 320/321 yielded the op po site re sult, pre dict ing that diagenetic cal cite be comes en riched in light Sr iso topes (Voigt et al, 2015).…”