REACTIVITY OF EVAPORITES DURING BURIAL - AN EXAMPLE FROM THE JURASSIC OF ALABAMA

被引：33

作者：

LAND, LS ^{[1
]}

EUSTICE, RA ^{[1
]}

MACK, LE ^{[1
]}

HORITA, J ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 1995年 / 59卷 / 18期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0016-7037(95)00262-X

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The Jurassic Louann salt was the first significant sedimentary unit to accumulate in the Gulf of Mexico sedimentary basin. Br/Cl and Sr-87/Sr-86 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 Sr-87/Sr-86 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.

引用

页码：3765 / 3778

页数：14

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