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青海大浪滩凹地梁中矿区是典型的固、液矿共存的钾镁盐矿床。地质勘查显示,梁中矿区埋深8~10m以下沉积有层状的含钾硫酸盐固体钾矿(主要是软钾镁矾,并伴生有钾石盐和光卤石)。在兴元钾肥厂已开挖的矿层断面,选择7.3 m的沉积剖面,采集并分析了73件盐样和7件晶间卤水样离子含量,结合2件样品的软钾镁矾稳定锶同位素比值、矿物组合分布和25℃时Na+,K+,Mg2+//Cl-,SO2-4–H2O五元体系介稳相图,探讨了研究区软钾镁矾沉积的化学元素组成特征和化学演化过程。结果表明,1)5.3~2.6 m沉积了钾盐矿物,K+含量主要在10%~18%之间变化;2)全新世温度的升高和外来水体的混入,使软钾镁矾沉积时矿物析盐序列呈现逆向析盐过程;3)对比软钾镁矾和研究区盐湖卤水、油田卤水的87Sr/86Sr值,推断大浪滩凹地软钾镁矾的沉积可能与其南侧断裂—小梁山构造气田水渗入有关。
Qinghai Dalang Tan concave beam in the mining area is a typical solid, liquid coexistence of potassium-magnesium salt deposits. Geological prospecting shows that the layered potassium potassium sulphate solid potassium ore (mainly soft muscovite, accompanied by potash stone salt and carnallite) is deposited beneath the depth of 8 ~ 10m in Liangzhong mining area. In the excavated mining section of Xingyuan Potash Plant, the sedimentary profile of 7.3 m was selected and the content of brine ions in 73 salt samples and 7 intercrystalline samples was collected and analyzed. Combined with the soft strontium aluminosilicate stable strontium isotope ratio , The mineral assemblage distribution and the metastable phase diagrams of Na +, K +, Mg2 + / Cl- and SO2-4-H2O at 25 ℃. The chemical element composition and chemical evolution of soft magnesia deposit in the study area were discussed. The results show that: 1) Potash minerals are deposited in 5.3-2.6 m, K + content mainly varies from 10% to 18%; 2) During the Holocene temperature increase and external water mixing, (3) comparing the 87Sr / 86Sr value of soft-magnesia and brine in salt lake brines and oilfields in the study area, it is inferred that the deposition of the soft magnesite in the Dalangtan depression may be associated with the southern fault-Xiaoliangshan structural gas field Water infiltration related.