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    陕南奥陶系宝塔组灰岩网状裂缝成因

    王安东 周瑶琪 仲岩磊 段竟 王子阳 张振凯

    王安东, 周瑶琪, 仲岩磊, 段竟, 王子阳, 张振凯, 2012. 陕南奥陶系宝塔组灰岩网状裂缝成因. 地球科学, 37(4): 843-850. doi: 10.3799/dqkx.2012.093
    引用本文: 王安东, 周瑶琪, 仲岩磊, 段竟, 王子阳, 张振凯, 2012. 陕南奥陶系宝塔组灰岩网状裂缝成因. 地球科学, 37(4): 843-850. doi: 10.3799/dqkx.2012.093
    WANG An-dong, ZHOU Yao-qi, ZHONG Yan-lei, DUAN Jing, WANG Zi-yang, ZHANG Zhen-kai, 2012. Causes of Reticular Cracks in Ordovician Baota Formation Limestone in Southern Shaanxi. Earth Science, 37(4): 843-850. doi: 10.3799/dqkx.2012.093
    Citation: WANG An-dong, ZHOU Yao-qi, ZHONG Yan-lei, DUAN Jing, WANG Zi-yang, ZHANG Zhen-kai, 2012. Causes of Reticular Cracks in Ordovician Baota Formation Limestone in Southern Shaanxi. Earth Science, 37(4): 843-850. doi: 10.3799/dqkx.2012.093

    陕南奥陶系宝塔组灰岩网状裂缝成因

    doi: 10.3799/dqkx.2012.093
    基金项目: 

    国家自然科学基金 40872095

    详细信息
      作者简介:

      王安东(1980-),男,博士研究生,地质学专业.E-mail:738625341@qq.com

    • 中图分类号: P588.2

    Causes of Reticular Cracks in Ordovician Baota Formation Limestone in Southern Shaanxi

    • 摘要: 为了研究奥陶系宝塔组灰岩网状裂缝的形成原因,利用古生物鉴定、野外露头对比及镜下薄片观察等方法进行分析.古生物以头足类、三叶虫、介形类和棘皮类为主,偶见腕足类,未见藻类.裂缝延伸到生物化石时停止,贯穿地层顶底面但未穿透相邻地层,平面呈瘤状、龟裂纹和S曲线等,锯齿状缝合线切穿裂缝.镜下发现灰质基块内散布着泥质团块,泥质团块通过微裂隙互相连通或连通主裂缝,泥质内夹的灰质碎屑长轴沿裂缝展布,新鲜剖面灰质基块与泥质裂缝无明显界限.提出宝塔期扬子板块处于稳定克拉通沉积环境,网状裂缝是在较深水缓慢沉积的低能开阔台地环境下,由于化学分异作用灰质质点聚集、压实作用胶态粘土矿物脱水收缩、泥质随水排出时充填裂缝而形成的,为非构造成因裂缝.

       

    • 图  1  宝塔组灰岩分布(据姬再良,1985修改)

      Fig.  1.  Baota Formation limestone distribution

      图  2  陕南地层柱状图

      Fig.  2.  Stratigraphic column in southern Shaanxi

      图  3  野外剖面及镜下薄片特征

      a.龙山宝塔组灰岩下部紫红色露头;b.中华震旦角石,裂缝与角石高角度相交时终止;c.镜下古生物碎屑;d.S形曲线,拐弯处光滑等轴状;e.垂向裂缝贯穿单地层,但是不切穿相邻地层;f.灰质基块内部泥质团体分布;g.镜下微裂缝,灰质碎屑长轴沿裂缝展布;h.岩样抛光剖面,裂缝与灰质界限不明显,散布生物碎屑

      Fig.  3.  Outcrop and microscopic flakes characteristics

      图  4  裂缝形成过程示意

      代表泥质质点;o代表灰质质点;箭头代表运动方向

      Fig.  4.  Schematic diagram of crack formation

      图  5  受力及脱水方向示意

      a.水平裂缝;b.中心向下弯曲裂缝;实线向外箭头代表脱水方向;虚线向里箭头代表受力方向;线的长度代表受力大小

      Fig.  5.  Direction of the force and dehydration schematic diagram

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