...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Carbonates and Evaporites >Petrographical and geochemical evidences for paragenetic sequence interpretation of diagenesis in mixed siliciclastic–carbonate sediments: Mozduran Formation (Upper Jurassic), south of Agh-Darband, NE Iran
【24h】

Petrographical and geochemical evidences for paragenetic sequence interpretation of diagenesis in mixed siliciclastic–carbonate sediments: Mozduran Formation (Upper Jurassic), south of Agh-Darband, NE Iran

机译：混合硅质-碳酸盐沉积物中成岩作用的共生序列解释的岩石学和地球化学证据：伊朗东北部阿格达班德南部的莫兹杜兰组（侏罗纪上侏罗统）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Upper Jurassic Mozduran Formation with a thickness of 420 m at the type locality is the most important gas-bearing reservoir in NE Iran. It is mainly composed of limestone, dolostone with shale and gypsum interbeds that grade into coarser siliciclastics in the easternmost part of the basin. Eight stratigraphic sections were studied in detail in south of the Agh-Darband area. These analyses suggest that four carbonate facies associations and three siliciclastic lithofacies were deposited in shallow marine to shoreline environments, respectively. Cementation, compaction, dissolution, micritization, neomorphism, hematitization, dolomitization and fracturing are diagenetic processes that affected these sediments. Stable isotope variations of δ18O and δ13C in carbonate rocks show two different trends. High depletion of δ18O and low variation of δ13C probably reflect increasing temperatures during burial diagenesis, while the higher depletion in carbon isotope values with low variations in oxygen isotopes are related to fresh water flushing during meteoric diagenesis. Negative values of carbon isotopes may have also resulted from organic matter alteration during penetration of meteoric water. Fe and Mn enrichment with depletion of δ18O also supports the contention that alteration associated with higher depletion in carbon isotope values with low variations in oxygen isotopes took place during meteoric diagenesis. The presence of bright luminescence indicates redox conditions during precipitation of calcite cement.
机译：上侏罗统莫兹杜兰组地层厚度为420 m，是伊朗东北部最重要的含气储层。它主要由石灰岩，白云岩，页岩和石膏夹层组成，在该盆地的最东部被划分为较粗的硅质碎屑岩。在Agh-Darband地区南部详细研究了八个地层剖面。这些分析表明，四个碳酸盐岩相协会和三个硅质碎屑岩相分别沉积在浅海相至海岸线环境中。胶结作用，压实作用，溶解作用，微晶化作用，新变质作用，血化作用，白云石化作用和压裂作用是影响这些沉积物的成岩作用过程。碳酸盐岩中δ 18 O和δ 13 C的稳定同位素变化表现出两种不同的趋势。 δ 18 O的高消耗和δ 13 C的低变化可能反映了埋藏成岩过程中温度的升高，而碳同位素值的较高消耗和氧同位素的低变化是与流星成岩过程中的淡水冲刷有关。碳同位素的负值也可能是由于大气水渗透过程中有机物的变化而引起的。 Fe和Mn的富集以及δ 18 O的消耗也支持这样的论点，即在流变成岩过程中发生了与碳同位素值的较高消耗相关的变化，而氧同位素的变化较小。明亮发光的存在表明方解石水泥沉淀过程中存在氧化还原条件。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号