| 豫西南淅川震旦系灯影组白云岩特征及成因分析 |
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| 引用本文： | 左鹏飞,孙江涛,郑德顺,刘思聪.豫西南淅川震旦系灯影组白云岩特征及成因分析[J].高校地质学报,2019,25(5):670. |
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| 作者姓名： | 左鹏飞 孙江涛 郑德顺 刘思聪 |
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| 作者单位： | 河南理工大学资源环境学院,焦作,454000;河南理工大学资源环境学院,焦作,454000;河南理工大学资源环境学院,焦作,454000;河南理工大学资源环境学院,焦作,454000 |
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| 摘 要： | 晚前寒武纪扬子克拉通及其周缘保存了一套比较完整的白云岩地层（灯影组）。扬子北缘（南秦岭） 地区的灯影组白
云岩与典型灯影组白云岩在成岩组合和沉积序列有较大差别，有待进一步研究。该研究在野外剖面实测、镜下鉴定基础
上，运用阴极发光和X射线衍射有序度分析对扬子北缘（南秦岭） 淅川地区灯影组白云岩进行了岩石学分类及成因机制研
究。研究区灯影组白云岩类型主要为泥—粉晶他形白云岩、细晶自形—半自形白云岩、以中—粗晶白云石为主的细—粗晶
半自形—他形白云岩、鞍形白云岩和岩溶角砾白云岩。其中泥—粉晶他形白云石为准同生阶段蒸发海水白云石化作用产
物；细晶自形—半自形白云石形成于早成岩浅埋藏阶段，成岩过程与蒸发海水回流渗透白云石化作用有关；细—粗晶半自
形—他形白云石和鞍形白云石属晚成岩期中—深埋藏环境下由碳酸盐岩矿物经过热液白云石化或重结晶作用所形成；岩溶
角砾白云岩是通过白云岩层的溶蚀—垮塌和砾间胶结作用形成。因此，由于相对海平面升降、上覆地层沉积厚度增加引起
的成岩环境变化以及后期流体的改造作用促使了研究区不同类型白云岩的发育。
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| 关 键 词： | 豫西南 震旦系 灯影组 白云岩 成因 |
Characteristics and Genesis of Sinian Dengying Formation Dolomite in the Xichuan Area,Southwestern Henan Province |
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| ZUO Pengfei,SUN Jiangtao,ZHENG Deshun,LIU Sicong.Characteristics and Genesis of Sinian Dengying Formation Dolomite in the Xichuan Area,Southwestern Henan Province[J].Geological Journal of China Universities,2019,25(5):670. |
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| Authors: | ZUO Pengfei SUN Jiangtao ZHENG Deshun LIU Sicong |
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| Abstract: | The late Precambrian dolomites are widely developed in the Yangtze Craton and its periphery areas in the Dengying
Formation. As the diagenetic assemblages and sedimentary sequences of the Dengying Formation in the northern Yangtze Craton are
quite different from those in the Yangtze Craton, it is critical to study the formation process and paleoclimatic implications of the
dolomites. Based on the field profile measurement, thin section observation, cathodoluminescence, and X-ray diffraction study of the
Dengying Formation in Xichuan area, the dolomite can be divided into four types, i.e., anhedral mud-powder crystalline dolomite,
euhedral-subhedral fine crystalline dolomite, subhedral-xenotropic fine-coarse crystalline dolomite, and saddle to karst breccia
dolomite. The anhedral mud-powder crystalline dolostone is the product of dolomitization related to high salinity seawater in the
penecontemporaneous stage. The euhedral-subhedral fine crystalline dolostone was deposited in the early diagenetic stage related to
shallow-buried dolomitization, which was caused by the infiltrating reflux of high salinity seawater. The subhedral-xenotropic
fine-coarse crystalline and saddle dolostone are the product of hydrothermal dolomitization or recrystallization of carbonate minerals in
the middle-deep burial environment in the late diagenetic period. The karst breccia dolomite is related to the dissolution-collapse of
early dolomite. Changes in diagenetic environment resulted in the development of different types of dolomites in the study area. |
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| Keywords: | Southwestern Henan Sinian Dengying Formation dolomite genesis |
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