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重庆石柱二叠纪栖霞组地球化学特征及其环境意义

田洋 赵小明 王令占 涂兵 谢国刚 曾波夫

田洋, 赵小明, 王令占, 涂兵, 谢国刚, 曾波夫. 重庆石柱二叠纪栖霞组地球化学特征及其环境意义[J]. 沉积学报, 2014, 32(6): 1035-1045.
引用本文: 田洋, 赵小明, 王令占, 涂兵, 谢国刚, 曾波夫. 重庆石柱二叠纪栖霞组地球化学特征及其环境意义[J]. 沉积学报, 2014, 32(6): 1035-1045.
TIAN Yang, ZHAO Xiao-ming, WANG Ling-zhan, TU Bing, XIE Guo-gang, ZENG Bo-fu. Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1035-1045.
Citation: TIAN Yang, ZHAO Xiao-ming, WANG Ling-zhan, TU Bing, XIE Guo-gang, ZENG Bo-fu. Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1035-1045.

重庆石柱二叠纪栖霞组地球化学特征及其环境意义

基金项目: 国家自然科学基金(批准号:41240016)与中国地质调查局基础地质调查项目(编号:1212010911016,1212011220517)联合资助
详细信息
    作者简介:

    田洋 男 1984年出生 硕士 沉积学 E-mail: 41834572@qq.com

  • 中图分类号: P595;TE121.3+1

Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing

  • 摘要: 在对重庆市石柱县二叠纪栖霞组地层野外露头沉积特征研究的基础上,结合室内薄片观察,根据碳酸盐岩样品的元素含量、比值及相关性,探讨了栖霞组沉积地球化学特征与古环境意义.用于古环境分析的10件栖霞组样品SiO2、MgO含量低,且两者具有较好的正相关性,Sr含量高,平均为1 751×10-6,Mn/Sr<0.1,Fe/Sr<1,δ18OPDB>-10‰,表明成岩过程中样品几乎不受硅化及白云岩化作用的影响,未发生化学性质上的改变,可作为古环境分析的可靠对象.栖霞组碳酸盐岩CaO含量高,平均为53.81%,接近纯灰岩的理论化学组成,陆源元素Al2O3、TiO2含量很低,平均值分别为0.17%与0.012%,表明其形成于陆源碎屑影响微弱的稳定古海洋环境.古气候指标MgO/CaO比值极低,平均为0.026,古盐度指标100×(MgO/Al2O3)比值高,平均为1 241,古水深判别指标Sr/Ba、1000×(Sr/Ca)比值高,平均值分别为286和4.54,指示了栖霞组碳酸盐岩为潮湿气候下的陆表海(远岸)沉积.古氧相地球化学指标U/Al、V/Al、Mo/Al、Cr/Al、Co/Al、V/(V+Ni)和U/Th特征一致表明栖霞组碳酸盐岩沉积于贫氧—缺氧环境.垂向上,陆源元素∑(Al2O3+TiO2)含量逐渐降低,古水深指标Sr/Ba、1000×(Sr/Ca)比值逐渐增大,表明栖霞组沉积过程中离岸渐远、陆源供给逐步减少、水体持续加深.
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出版历程
  • 收稿日期:  2013-11-14
  • 修回日期:  2014-02-21
  • 刊出日期:  2014-12-10

目录

    重庆石柱二叠纪栖霞组地球化学特征及其环境意义

      基金项目:  国家自然科学基金(批准号:41240016)与中国地质调查局基础地质调查项目(编号:1212010911016,1212011220517)联合资助
      作者简介:

      田洋 男 1984年出生 硕士 沉积学 E-mail: 41834572@qq.com

    • 中图分类号: P595;TE121.3+1

    摘要: 在对重庆市石柱县二叠纪栖霞组地层野外露头沉积特征研究的基础上,结合室内薄片观察,根据碳酸盐岩样品的元素含量、比值及相关性,探讨了栖霞组沉积地球化学特征与古环境意义.用于古环境分析的10件栖霞组样品SiO2、MgO含量低,且两者具有较好的正相关性,Sr含量高,平均为1 751×10-6,Mn/Sr<0.1,Fe/Sr<1,δ18OPDB>-10‰,表明成岩过程中样品几乎不受硅化及白云岩化作用的影响,未发生化学性质上的改变,可作为古环境分析的可靠对象.栖霞组碳酸盐岩CaO含量高,平均为53.81%,接近纯灰岩的理论化学组成,陆源元素Al2O3、TiO2含量很低,平均值分别为0.17%与0.012%,表明其形成于陆源碎屑影响微弱的稳定古海洋环境.古气候指标MgO/CaO比值极低,平均为0.026,古盐度指标100×(MgO/Al2O3)比值高,平均为1 241,古水深判别指标Sr/Ba、1000×(Sr/Ca)比值高,平均值分别为286和4.54,指示了栖霞组碳酸盐岩为潮湿气候下的陆表海(远岸)沉积.古氧相地球化学指标U/Al、V/Al、Mo/Al、Cr/Al、Co/Al、V/(V+Ni)和U/Th特征一致表明栖霞组碳酸盐岩沉积于贫氧—缺氧环境.垂向上,陆源元素∑(Al2O3+TiO2)含量逐渐降低,古水深指标Sr/Ba、1000×(Sr/Ca)比值逐渐增大,表明栖霞组沉积过程中离岸渐远、陆源供给逐步减少、水体持续加深.

    English Abstract

    田洋, 赵小明, 王令占, 涂兵, 谢国刚, 曾波夫. 重庆石柱二叠纪栖霞组地球化学特征及其环境意义[J]. 沉积学报, 2014, 32(6): 1035-1045.
    引用本文: 田洋, 赵小明, 王令占, 涂兵, 谢国刚, 曾波夫. 重庆石柱二叠纪栖霞组地球化学特征及其环境意义[J]. 沉积学报, 2014, 32(6): 1035-1045.
    TIAN Yang, ZHAO Xiao-ming, WANG Ling-zhan, TU Bing, XIE Guo-gang, ZENG Bo-fu. Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1035-1045.
    Citation: TIAN Yang, ZHAO Xiao-ming, WANG Ling-zhan, TU Bing, XIE Guo-gang, ZENG Bo-fu. Geochemical Characteristics and Its Paleoenvironmental Implication of Permian Qixia Formation in Shizhu, Chongqing[J]. Acta Sedimentologica Sinica, 2014, 32(6): 1035-1045.
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