豫西渑池地区中元古界兵马沟组沉积环境分析
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摘要
华北克拉通南缘中元古代早期发育陆源碎屑-碳酸盐岩沉积,豫西地区兵马沟组作为其早期陆源碎屑充填沉积,对于探讨中元古代早期华北克拉通南缘沉积环境演化有重要意义。在野外地质剖面实测基础上,结合岩性及粒度特征划分沉积相,探讨渑池地区兵马沟组沉积环境演化,为华北克拉通南缘中元古代早期沉积环境演化提供约束。豫西渑池地区兵马沟组剖面自下而上主要岩性为含砾砂岩-粉砂岩、泥岩-含砾砂岩,垂向上沉积物粒度特征具粗-细-粗的变化,概率累计曲线揭示其水动力条件先减小后变大,兵马沟组下段为河控三角洲的三角洲平原-三角洲前缘-前三角洲-三角洲前缘亚相,上段为滨海相的临滨-前滨亚相,其代表华北克拉通南缘构造活跃期-稳定盖层沉积期之间初期海进-海退旋回;中元古代早期,华北克拉通南缘表现为北东高南西低的古地形特征,兵马沟组是该时期熊耳群或华北克拉通古老基底遭受快速剥蚀的产物;对比不同地区的兵马沟组沉积特征,其在区域上的沉积差异可能是沉积时间及古地形差异性造成的。渑池地区兵马沟组在该时期仍受华北克拉通熊耳裂谷活动的影响,兵马沟组记录了裂谷盆地充填早期的演化过程,对研究华北克拉通南缘中元古代早期大地构造演化具有重要意义。
The Early Mesoproterozoic volcanic-sedimentary successions crop out in the southern North China Craton(NCC), where the sedimentary sequences reflect the evolution of the area. The Bingmagou Formation, the sedimentary strata marking the evolution of the Early Mesoproterozoic, records the active evolution to stable evolution of the NCC and its constraint to the evolution of the NCC.This formation is considered to be the earliest clastic deposit and records the earliest information of tectonic evolution after the Xiong'er volcanism. Based on the field reconnaissance and profile measurements, the sedimentary characteristics of the Mesoproterozoic Bingmagou Formation in Mianchi, western Henan Province are studied by slice observation and grain size analysis methods to reconstruct the sedimentary environment. The results suggest that the formation is characterized by pebbly quartzite sandstone and coarse quartzites sandstone at the base, overlain by siltstone and argillaceous rocks, with pebbly quartzites at the top. The Mianchi Bingmagou Formation demonstrates a set of transgression-regression, including delta plain, delta front, pro-delta subfacies, delta front, and the coastal facies from bottom to top. The sedimentary facies, provenance characteristics and basin-filling succession of the Bingmagou Formation were well correspond to the Early Mesoproterozoic depositional-tectonic evolution in the southern margin of the NCC.
The Early Mesoproterozoic volcanic-sedimentary successions crop out in the southern North China Craton(NCC), where the sedimentary sequences reflect the evolution of the area. The Bingmagou Formation, the sedimentary strata marking the evolution of the Early Mesoproterozoic, records the active evolution to stable evolution of the NCC and its constraint to the evolution of the NCC.This formation is considered to be the earliest clastic deposit and records the earliest information of tectonic evolution after the Xiong'er volcanism. Based on the field reconnaissance and profile measurements, the sedimentary characteristics of the Mesoproterozoic Bingmagou Formation in Mianchi, western Henan Province are studied by slice observation and grain size analysis methods to reconstruct the sedimentary environment. The results suggest that the formation is characterized by pebbly quartzite sandstone and coarse quartzites sandstone at the base, overlain by siltstone and argillaceous rocks, with pebbly quartzites at the top. The Mianchi Bingmagou Formation demonstrates a set of transgression-regression, including delta plain, delta front, pro-delta subfacies, delta front, and the coastal facies from bottom to top. The sedimentary facies, provenance characteristics and basin-filling succession of the Bingmagou Formation were well correspond to the Early Mesoproterozoic depositional-tectonic evolution in the southern margin of the NCC.
引文
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