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由于探索地震活动、新构造运动及水热能源分布规律的需要,河北平原第四纪火山活动的研究已日益被人们所重视.河北平原是火山活动较为频繁的地区之一,本文重点总结区内火山岩岩石特征,进行火山活动分期,并论述其与新构造运动的关系.河北平原位于华北大平原北部,西依太行山,东临渤海湾(图1),面积约6万平方公里,是中、新生代以来的构造沉降带,其中第四系大部是在第三系(总厚超过ID00—3000米)基础上的连续沉积.上第三系上段,主要是一套棕红、紫、灰绿、棕黄等颜色的泥岩与砂岩互层的湖相沉积.第四系主要有六个岩性单元,随着深度的变小,土层颜色从暗变淡,从红变灰,是一套松散的灰黄色砂或砾卵石(混杂不同程度的泥质),与棕红至棕、棕至黄、黄至灰色的粘性土互层.有明显的旋回性.从老到新为:红色层(相当于(Q~1_1)、棕色层下段(Q~2_1)、棕色层上段(Q~1_2)、黄色层下段(Q~2_2)、黄色层上段(Q_3)及灰色层(Q_4)(图2).据近年来平原地下水勘察中积累的大量资料,这套第四纪松散堆积中见有火山岩类堆积的钻孔约40多个,主要分布在沧州市周围及东至滨海一带;衡水、深县、晋县、赵县、束鹿和肥乡等地有零星分布.火山堆积总的特点是岩性多变,呈多层不连续分布,但层位却比较稳定,且与构造断裂带有相当密切的关系.一、?
Due to the need of exploring the seismic activity, neotectonic movement and the distribution law of hydrothermal energy, the research of Quaternary volcanic activity in Hebei Plain has been paid more and more attention.Hebei Plain is one of the volcano-prone areas, Volcanic rock characteristics, the volcanic activity staging, and discusses the relationship with the neotectonic movement.Hebei Plain is located in the northern part of North China Plain, west of Taihang Mountains, east Bohai Bay (Figure 1), an area of about 60,000 square kilometers, Cenozoic tectonic subsidence zone, of which the Quaternary mostly in the Tertiary (total thickness over ID00-3000 meters) on the basis of the continuous deposition of Upper Tertiary, mainly a set of reddish brown, purple, gray Green, Brown and other colors of mudstone and sandstone interbedded lacustrine deposition.Quaternary mainly six lithological units, with the depth becomes smaller, the color of the soil fades from dark, from red to gray, is a Set of loose grayish yellow sand or gravel pebbles (mixed with varying degrees of muddy), and brown red to brown, brown to yellow, yellow to gray cohesive soil intercalary. There is a clear cycle. From old to new: red Layer (equivalent to (Q ~ 1_1), the lower brown layer (Q ~ 2_1), brown layer (Q ~ 1_2), the lower part of the yellow layer (Q ~ 2_2), the upper part of the yellow layer (Q_3) and the gray layer (Q_4) (Figure 2) .According to the large amount of data accumulated in the groundwater survey in the plain in recent years, There are about 40 volcanic rocks piled up in the accumulation area, mainly distributed around Cangzhou City and east to the coastal area; there are sporadic distributions in Hengshui County, Shenxian County, Jinxian County, Zhao County, Shulu County and Feixiang County etc. Volcanoes The general characteristics of the accumulation are that the lithology is changeable and is in multi-layer and discontinuous distribution, but the layers are relatively stable and have a fairly close relationship with the tectonic fault.