作者简介:李向东(1973-),男,陕西蓝田人,讲师,主要从事沉积学教学与研究.E-mail:lixiangdong614@163.com
收稿日期: 2016-11-09
修回日期: 2017-02-01
网络出版日期: 2017-03-20
基金资助
国家自然科学基金面上项目“阿拉善地块东南缘与鄂尔多斯盆地西缘中、上奥陶统浊流演化及其与内波相互作用研究”(编号 41272119)资助
版权
Analysis of Vertical Sedimentary Successions in the Lower Part of Kelimoli Formation, Middle Ordovician, Zhuozishan Area
First author:Li Xiangdong (1973-), male, Lantian County, Shaanxi Province, Lecturer. Research areas include marine sedimentology.E-mail:Lixiangdong614@163.com
Received date: 2016-11-09
Revised date: 2017-02-01
Online published: 2017-03-20
Supported by
Project supported by the National Natural Science Foundation of China “Study of the evolution of turbidity currents and its interaction with internal waves of Middle and Upper Ordovician on the southeastern margin of Alxa block and western margin of Ordos Basin”(No.41272119)
Copyright
高旋回性薄层石灰岩一般沉积于斜坡和深水盆地环境中,良好地保存了有关天文旋回的信息,具有重要的研究意义。鄂尔多斯盆地西缘内蒙桌子山地区中奥陶统达瑞威尔阶克里摩里组下段发育韵律性极好的薄层石灰岩与页岩,是较为理想的研究层位。在详细的野外观察和测量的基础上,结合石灰岩稀土元素及其他相关微量元素测试结果,对克里摩里组下段薄层状石灰岩的垂向沉积序列进行详细分析,结果如下:① 薄层石灰岩由4种垂向序列(旋回束)组成,分别为向上变薄序列、向上变厚序列、双向序列和波动序列;② 在剖面上可划分出145个薄层石灰岩与极薄层页岩对、33个旋回束和7个超旋回束;③(La/Nd)N值和Mn/Fe值总的变化趋势一致,从下到上呈减小趋势,但波动较大;④ 稀土元素总量和铕异常值曲线具有良好的镜像关系,与(La/Nd)N值具有耦合关系;⑤ 石灰岩晶粒大小曲线、V/Cr和V/(V+Ni)值曲线形态相似,变化一致,总体上从下到上由小变大再变小,与(La/Nd)N值曲线总体上具有相似性,但局部常出现镜像关系。依据沉积序列的类型、在剖面上的分布及各参数在垂向上的关系,在已有研究成果基础上可以得出以下结论:① 双向序列可能受控于等深流强度(米兰柯维奇旋回),向上变薄序列与波动序列可能受控于海平面的变化,向上变厚序列可能受控于构造作用;② 受米兰柯维奇旋回控制的等深流作用贯穿整个沉积,反映的沉积时限不少于2.9 Ma;③ 垂向上沉积演化受控于次级沉积控制因素构造作用和海平面上升,两者在垂向上交替作用,共反映出2个构造活跃阶段。
李向东 , 阙易 , 郇雅棋 . 桌子山中奥陶统克里摩里组下段薄层状石灰岩垂向序列分析[J]. 地球科学进展, 2017 , 32(3) : 276 -291 . DOI: 10.11867/j.issn.1001-8166.2017.03.0276
There is significance to study high-frequency cyclicity thin-bedded limestone which deposited in carbonate ramp and deep-water basin for its well record of astronomic cycles. And there is an ideal section for these studies in the lower part of Kelimoli Formation, in Darriwilian Stage, Middle Ordovician of western Ordos Basin(Zhuozishan area in Inner Mongolia) for its well rhythmic alternations of thin-bedded limestones and mudstones. This work focused on detailed vertical sedimentary successions analysis of these thin-bedded limestones based on detailed field work, as well as the data of rare earth elements and other related trace elements in limestones. The results show as follows: ① there are four types of sedimentary successions(bundles) in thin-bedded limestones, including thinning-upward succession, thickening-upward succession, bidirectional succession(thickening- and thinning-upward) and waving-upward succession; ② the section consists of 145 limestone-mudstone rhythmics, 33 bundles and 7 superbundles; ③ the variation in(La/Nd)N and Mn/Fe molar ratios of limestones along with depth have a similar trend which decreases from bottom to top in general, but have some anomalies distribution; ④ the variation in REE concentrations and Eu anomalies along with depth have a perfect enantiomorphous relationship as well as coupling with the molar ratios of(La/Nd)N; ⑤ the variation of crystal size, V/Cr and V/(V+Ni) molar ratios also have a similar trend which is increasing and then decreasing from bottom to top, and have some local enantiomorphous relationship with the molar ratios of(La/Nd)N in the overall similar distribution patterns. Some conclusion can be drawn according to the types of sedimentary successions and its distribution in profile as well as the ratios of some geochemical parameter along depth based on previous works. These include: ① thickening-upward and bidirectional successions maybe reflect the intensity of tectonism and contour current which is controlled by Milankovitch cycle respectively, and the rising of sea level may be was responsible both for the thinning-upward and waving-upward successions; ② the intensity of contour current which is controlled by Milankovitch cycle was acted throughout the depositions, and the range of deposition time is not less than 2.9 Ma; ③ the vertical sedimentary evolution is perhaps controlled by the alternating of tectonism and rising sea levels, and the section suggests two tectonic stages.
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