Geochemical characteristics of deep-seated potassium-rich brine in the Middle Triassic Leikoupo Formation, Sichuan, China

被引：0
|
作者：
Sijing Huang
Yunfu Zeng
机构：
[1] Chengdu University of Technology,
来源：
Chinese Journal of Geochemistry | 1998年 / 17卷 / 2期
关键词：
deep-seated brine; potassium; boron isotope; Triassic; Chengdu Basin;
D O I：
10.1007/BF03166833
中图分类号：
学科分类号：
摘要：
Brine extremely rich in potassium, boron and bromine has been discovered from the Middle Triassic Leikoupo Formation at a depth of 4300 m in Sichuan Province. It contains ∼50 g/L of K+, >92 g/L of Na+, >12 g/L of B2O3, >2.36 g/L of Br− and ∼0.030 g/L of I+. The solid precipitates during evaporation at 25°C include KB5O8·4H2O, K2B4O7·3H2O, MgCl2·6H2O and KMgCl3·6H2O. The brine ranges from 2.2‰ to 2.8‰ (SMOW) in δ18O, − 38‰ – − 53‰ (SMOW) in δD, 15.6‰ in δ34S, and 13.5‰–15.1‰ in δ11B. These data, particularly the isotopic composition of boron, indicate that the brine has a composite derivation from marine and nonmarine brines and dissolved marine evaporites in the Triassic system.
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页码：123 / 127
页数：4
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