庐枞盆地科学深钻ZK01孔流体包裹体研究
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

本文为国家“深部探测技术与实验研究专项(SinoProbe)”第三项目“深部矿产资源立体探测技术及实验研究 ”第六课题(编号SinoProbe 03 06)资助的成果。


Fluid Inclusion Studies of Deep Drilling ZK01, Luzong Basin
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    砖桥科学深钻ZK01孔位于庐枞盆地中部,孔内自上到下包括第四系砾石层(0~17 m)、砖桥组火山 沉积岩系(17~1488 m)、正长岩(1488~1848 m)和二长岩(1848~201195 m)四个岩性段。钻孔深部(1500~1900 m)的正长岩和二长岩内发育强烈的热液蚀变及铀钍矿化(钛铀矿、铀钍矿),向上(300~1580 m)蚀变逐渐减弱并伴有磁铁矿、黄铁矿、黄铜矿化。详细研究表明,流体活动包括五个阶段,即Ⅰ绿色电气石+钾长石+硬石膏阶段,Ⅱ粉红色电气石+硬石膏+铀钍矿化阶段,Ⅲ黑色电气石+硬石膏+磁铁矿化+铀钍矿化阶段,Ⅳ硬石膏+黄铁矿+黄铜矿阶段,Ⅴ石膏+方解石+石英阶段。电气石、硬石膏和石英中流体包裹体可划分为富液相(L型)、富气相(V型)、含子晶(S型)三种类型,其中S型流体包裹体中子矿物主要为石盐和钾盐。第Ⅰ阶段均一温度峰值为540~560℃,盐度峰值由高盐度和低盐度两部分组成,分别为65%~70% NaCl eq和0~5% NaCl eq;第Ⅱ阶段均一温度峰值为320~340℃,盐度峰值为0%~5% NaCl eq;第Ⅲ阶段均一温度范围为380~400℃,盐度峰值为0%~5% NaCl eq;第Ⅳ阶段均一温度峰值为240~260℃,盐度峰值为0~5% NaCl eq;第Ⅴ阶段均一温度范围为160~180℃,盐度峰值为0%~5% NaCl eq。根据成矿阶段沸腾包裹体群估算的成矿深度约073 km左右,显示庐枞盆地自铀钍矿化成矿以来剥蚀作用不强,指示庐枞盆地存在较好的矿床保存条件。深部钻孔内成矿流体性质、温度范围与庐枞盆地内其他矿区类似,为庐枞盆地成矿流体系统的一部分。庐枞盆地成矿流体系统成矿流体演化过程中发生过多次沸腾,沸腾所引起的物理化学状态的改变可能是导致区域矿床矿质迁移与沉淀的主要因素之一。

    Abstract:

    Scientific deep drilling named ZK01 of Zhuanqiao lies in the centre of Luzong, and can be divided into 4 part including the Quaternary gravels (0~17 m), volcanic sedimentary at Zhuanqiao Formation (17~1488 m), syenite (1488~1848 m) and monzonite (1848~2011.95 m). Deep drilling named ZK01 conducted in Zhuanqiao of Luzong basin was discovered deep rocks syenite and monzonite associated with a large amount of uranium and thorium mineralization (1500~1900 m) while in the shallow, trachyandesites and diorite prophyry associated with magnetite and pyrite mineralization (0~1470 m). According to the alteration and mineralization assemblage, mineralization can be divided into five stages, anhydrite tourmaline veins at stageⅠ, uranium thorium mineralization at stageⅡ, magnetite mineralization at stage Ⅲ, sulfide secondary quartze at stage Ⅳ and quartz calcite sulfide at stage Ⅴ. Three types of fluid inclusions including liquid rich (Ⅰ), gas rich (Ⅱ) and daughter mineral bearing (Ⅲ) fluid inclusions, respectively, have been observed. The daughter minerals mainly include halite and sylvite. The fluid inclusions of stage Ⅰ are characterized by high temperatures (540~560℃ at peak) and low to high salinity 65%~70% NaCl eq and 0%~5% NaCl eq at peak). The fluid inclusions of stage Ⅱ exhibit medium to high temperatures (320~340℃ at peak) and low to high salinity (0%~5% NaCl eq at peak). The fluid inclusions of stage Ⅲ have medium temperatures (380~400℃ at peak) and medium to high salinity (0~5% NaCl eq at peak). The fluid inclusions of stage Ⅳ have medium temperatures (240~260℃ at peak) and medium to high salinity (0%~5% NaCl eq at peak). The fluid inclusions of stage Ⅴ have medium temperatures (160~180℃ at peak) and medium to high salinity (0%~5% NaCl eq at peak). Fluid properties in deep drilling, are similar to other deposits in Luzong basin. It indicates that metallogenic fluid act as a part of the fluid in Luzong basin mineralization system. Boiling are occurred in fluid evolution repeatedly, which cause the change of physical and chemical state that change may be one of the major factors leading to migration and mineral precipitation.

    参考文献
    相似文献
    引证文献
引用本文

熊欣,徐文艺,杨竹森,贾丽琼,李骏.2014.庐枞盆地科学深钻ZK01孔流体包裹体研究[J].地质学报,88(4):584-597.
.2014. Fluid Inclusion Studies of Deep Drilling ZK01, Luzong Basin[J]. Acta Geologica Sinica,88(4):584-597.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2014-02-15
  • 最后修改日期:2014-03-12
  • 录用日期:
  • 在线发布日期: 2014-04-30
  • 出版日期: