四川周公山-汉王场地区峨眉山玄武岩中流体类型及活动期次  

Fluid types and activities of Emeishan basalt in Zhougong mountain-Hanwang field of Sichuan Province

作　　者：侯明才[1,2] 王文楷[1,2] 张本健[3] 王维[3] 李秀华[2] 邓敏[2] 裴森奇[3] 杨毅[3] 

机构地区：[1]油气藏地质与开发工程国家重点实验室成都理工大学,成都610059 [2]成都理工大学沉积地质研究院,成都610059 [3]中国石油西南油气田分公司川西北气矿,江油621709

出　　处：《岩石学报》2013年第8期2709-2718,共10页Acta Petrologica Sinica

基　　金：高等学校博士学科点专项科研基金项目(20115122110002);四川省重点学科"构造地质学"建设基金项目(SZD0408)联合资助

摘　　要：来自汉王场-周公山地区周公2井和汉6井峨眉山玄武岩钻井岩心样品显示峨眉山玄武岩有:隐晶玄武岩、杏仁状玄武岩,凝灰岩,火山角砾岩,凝灰角砾岩,绿帘石岩,赤铁矿染玄武岩,红土化玄武岩和脉岩等九种岩石类型。其中发育的杏仁体成分有:赤铁矿杏仁体、绿帘石杏仁体、石英-绿泥石杏仁体、蛋白石-赤铁矿杏仁体、磁铁矿-赤铁矿杏仁体、榍石-玉髓杏仁体、绿帘石-葡萄石-绿泥石杏仁体、钛铁矿-玉髓-绿泥石-玉髓杏仁体等8种,脉体有:长石脉、赤铁矿脉、石英脉、绿帘石脉、绿泥石、榍石脉、方解石脉、玉髓-水铝英石脉、方解石-赤铁矿脉、方解石-绿泥石脉、石英-方解石脉、石英-绿帘石脉、石英-沥青脉、赤铁矿-玉髓-绿泥石脉、绿帘石-绿泥石-玉髓脉等15种。这些脉体和杏仁体形成于峨眉山玄武岩形成演化的不同阶段,喷溢期流体受岩浆原生组分影响,大气降水影响程度低,温度属高-中温,脉体包裹体盐度-温度为正相关,代表性产物为赤铁矿脉;风化期流体主要来源于大气降水,氧化作用和水解作用对脉体的发育产生了很大影响,这一时期δ13C为低-中负值,包裹体盐度、温度低,以水铝英石脉最为典型;进入埋藏期以后,上覆地层水和深部的卤水对岩石进行改造,这一时期的流体属低-中温,包裹体盐度与温度呈负相关,受有机质影响,δ13C呈高负值,以绿帘石脉最为典型。Samples from Zhougong 2 well and Han 6 well in Zhougong mountain-Hanwang field show that the Emeishan basalt can be divided into 9 types,cryptocrystalline basalt,amygdaloidal basalt,tuff,volcanic breccia,tuff-breccia,epidosite rock,hematited-basalt,weathered basalt and vein rock. Minerals and with their combinations such as hematite,epidote,quartz-chlorite,opalhematite,magnetite-hematite,sphene-chalcedony,epidote-prehnite-chlorite,and ilmenite-chalcedony-chlorite-chalcedony are observed in amygdalas. There are 15 kinds veins in the Emeishan basalt such as： feldspar vein,hematite vein,quartz vein,epidote vein, chlorite vein,sphene vein,calcite vein,chalcedony-allophane vein,calcite-hematite vein,calcite-chlorite vein,quartz-calcite vein, quartz-epidosite vein,quartz-bituminous vein,hematite-chalcedony-chlorite vein and epidosite-chlorite-chalcedony vein. These veins and amygdalas were formed in different stages during the evolution of the Emeishan basalt. Fluid formed in the volcanic eruption stage was mainly influenced by the magmatic components rather than the atmospheric precipitation. It had mid-high temperature which is positively related to the salinity. The representative product is hematite vein. The fluid mainly originated from the meteoric water when weathering,and veins are strongly affected by oxidation and hydrolysis at the same time. The result shows lower-mid negative δ13C, with the low salinity and temperature,the allophane vein is of main feature. When it comes to the burial period,the rocks were transformed by the overlying strata water and deep brine. The fluid had lower-mid temperature with negatively relation to the salinity, and was controlled by the organic matter. The δ13C revealed a high negative value and epidosite vein is the most typical one.

关 键 词：峨眉山玄武岩 流体 包裹体 同位素 活动期次 

分 类 号：P588.145[天文地球—岩石学]