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Ordovician Seawater Composition: Evidence from Fluid Inclusions in Halite
Author(s) -
MENG Fanwei,
ZHANG Yongsheng,
Galamy A.R.,
XING Enyuan,
NI Pei,
JI Limin
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12265_11
Subject(s) - chinese academy of sciences , china , beijing , geology , halite , geologist , biogeosciences , geochemistry , archaeology , earth science , geography , paleontology , structural basin
composition of seawater, however Ordovician halite is very rare. Ordovician is a key time during the evolution history. However there are no Ordovician seawater data reported except from the data from the halite from the boundary of Ordovician and Silurian. Ca and Mg concentration were determined in brines from large secondary inclusions, located on periphery of the chevron. In brine from the first inclusion the Са content was 87.9 and 75.8 g/l (81.9 g/l in average). In this study, we report the major compositions from middle Ordovician halite in China. Ordovician fluid inclusions give the direct evidence that the Ordovician seawater is Ca-rich seawater of calcite sea, with the Na–K–Mg–Ca–Cl type seawater composition (Kovalevich et al., 1998; Lowenstein et al., 2001), while late-stage potash salts in marine evaporates is the KCl types (Hardie, 1996).