TY - JOUR
T1 - Reactivity of evaporites during burial
T2 - An example from the Jurassic of Alabama
AU - Land, Lynton S.
AU - Eustice, Rachel A.
AU - Mack, Larry E.
AU - Horita, Juske
N1 - Funding Information:
Acknowledgments--Support for this work was derived from the Geology Foundation of the University of Texas and the Department of Energy (DE-FGO5-92ERI4249). The work of J. Horita was sup- ported by a NSF grant to Harvard University, H. D. Holland principal investigator, and the geoscience program of the office of Basin Energy Sciences, US Department of Energy, under contract number DE-AC05-84OR24100 with Martin Marietta Energy Systems, Inc. We thank H. D. Holland, W. T. Holser, and two unidentified reviewers for constructive comments, which improved an earlier version of the manuscript.
PY - 1995/9
Y1 - 1995/9
N2 - The Jurassic Louann salt was the first significant sedimentary unit to accumulate in the Gulf of Mexico sedimentary basin. Br/Cl and 87Sr/86Sr ratios of halite from a single core into the top of the formation record the evaporation of normal seawater to bittern stage. The bittern zone today consists of intergrown halite and sylvite. The Br and Rb contents of the solid phases, along with 87Sr/86Sr ratios and Rb/Sr systematics, are inconsistent with precipitation of the existing phases from seawater evaporated in Jurassic time. Rather, petrography and fluid inclusion and solid phase chemistry from the bittern zone is consistent with postdepositional water/rock interaction which diagenetically modified a marine bittern assemblage to halite + sylvite. The chemistry of the Br- and Rb-rich saline formation waters characteristic of this area today, likewise, may reflect water/evaporite interaction during burial.
AB - The Jurassic Louann salt was the first significant sedimentary unit to accumulate in the Gulf of Mexico sedimentary basin. Br/Cl and 87Sr/86Sr ratios of halite from a single core into the top of the formation record the evaporation of normal seawater to bittern stage. The bittern zone today consists of intergrown halite and sylvite. The Br and Rb contents of the solid phases, along with 87Sr/86Sr ratios and Rb/Sr systematics, are inconsistent with precipitation of the existing phases from seawater evaporated in Jurassic time. Rather, petrography and fluid inclusion and solid phase chemistry from the bittern zone is consistent with postdepositional water/rock interaction which diagenetically modified a marine bittern assemblage to halite + sylvite. The chemistry of the Br- and Rb-rich saline formation waters characteristic of this area today, likewise, may reflect water/evaporite interaction during burial.
UR - http://www.scopus.com/inward/record.url?scp=0029540097&partnerID=8YFLogxK
U2 - 10.1016/0016-7037(95)00262-X
DO - 10.1016/0016-7037(95)00262-X
M3 - Article
AN - SCOPUS:0029540097
SN - 0016-7037
VL - 59
SP - 3765
EP - 3778
JO - Geochimica et Cosmochimica Acta
JF - Geochimica et Cosmochimica Acta
IS - 18
ER -