地层接触关系

地层接触关系 地层接触关系 地层接触关系 两套不同时代地层之间的接触关系。通常分为两种类型:?整合接触。简称整合。上、下地层之间没有发生过长时期沉积中断或地层缺失，即地层是连续的。?不整合接触。简称不整合。上、下地层之间有过长时期沉积中断，出现地层缺失，即地层是不连续的。在研究地层接触关系时不能只从几何关系考虑，要结合沉积中断时限的长短，有无陆上剥蚀等情况全面考虑。 地层接触关系 作者:佚名转贴自:石油知识大观| 点击数:447 地壳时时刻刻都在运动着。同一地区在某一时期可能是以上升运动为主，形成高地，遭受风化剥蚀，另一时期可能是以下降运动为主，形成洼地，接受沉积;也可能是在长时期内下降接受沉积，这样就使得早晚形成的地层之间具有不同的相互关系，即地层接触关系。 (一)整合接触 沉积物连续堆积，新老地层之间产状完全一致，时代连续岩石性质与生物演变连续而渐变， 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 明志层是在沉积区持续稳定下降的背景上沉积的。 (二)平行不整合接触 地壳缓慢下降，沉积区接受沉积，然后地壳上升成陆，沉积物露出水 面遭受风化剥蚀，接着地壳又下降接受沉积，形成一套新的地层。这样，先沉积的和后沉积的地层之间是平行叠置的，但并不连续，而是具有沉积间断。因此，平行不整合接触代表着地壳均匀下降沉积，然后上升剥蚀，再下降沉积的一个总过程。 特点:新、老地层产状一致，沉积出现间断，岩石性质和古生物演化突变。 (三)角度不整合接触 地壳缓慢下降，沉积区(盆地)接受沉积，然后地壳上升成陆，受到水平挤压形成褶皱和断裂，并遭受风化剥蚀，接着又下降接受沉积，形成一套新的地层。这样，先沉积的和后沉积的地层之间不是平行叠置，而是成一定角度相交，有明显的沉积间断、时代不连续。因此，角度不整合代表着地壳均匀下降沉积，然后水平挤压形成褶皱、断裂并上升遭受风化剥蚀，再下降接受沉积的过程。 特点:新、老地层产状不一致，沉积出现间断，岩石性质和古生物演化突变。 (四)超覆不整合接触 地壳下降，沉积盆地的水体逐渐扩大，沉积范围也逐渐扩大。在盆地的内部，沉积物按正常的层序沉积。而在盆地的边缘地带，越来越新的沉积地层依次向陆地方向扩展，逐渐超越下面的较老地层，直接覆盖于周缘的剥蚀面上，形成不整合接触，称为超覆不整合。 特点:发育于盆地边缘， It is a transitional phenomenon. The strata and the lower strata of the same era become integrated into the basin and become unconformity with the basin. In the overlying area, the new strata are always directly buried on the denudation surface, and some of them are lost. Integration and unconformity 1, integration: continuous deposition of rock strata, sequence no fault, the occurrence of consistent, continuous times, or the evolution of which is gradual change. 2, unconformity: sequence is interrupted and missing, that is, some strata are not deposited or deposited, but they are eroded. Two, unconformity type (1) parallel unconformity: falling deposition, rising, sedimentary hiatus, denudation, re falling and re deposition; gravels on the unconformity surface, paleo weathering crust and paleosol layer. (two) angular unconformity Features: the absence of some strata, the formation of the upper and lower strata inconsistent, with a certain angle intersection, the unconformity surface with underlying rock layer composed of the bottom conglomerate, ancient weathering crust, paleosol layer. Formation process: falling deposition, fold up (accompanied by faulting, magmatic activity, metamorphism, etc.). Before the overlying strata were deposited, some important structural events, such as fold, occurred. (three) geographical unconformity (regional unconformity) refers to partial parallel unconformity, but in a large scale it is angle unconformity. (four) embedding unconformity Three. Research on unconformity (I) identify the existence of unconformity 1, biostratigraphic evidence: fossils reflect the discontinuity of biological evolution (species, genus, species differences in different mutations). 2, sedimentary aspects of the mark, there are erosion surface, ancient weathering crust, paleosol, and Fe, Mn, P, Ni, rare earth or bauxite, etc., the bottom conglomerate. 3, the structural aspects of the sign: attitude, deformation and metamorphism. 4. Indications of magmatic activity and metamorphism. (two) observe and study the occurrence, lithology and age of unconformities and their upper and lower formations. 1, detailed surveying profile, research on lithology, lithofacies and fossils, determine the age structures observed in morphology, deterioration, magmatic activity. 2, gravel source, particle size, roundness, sorting, direction and so on. 3. Drawings, drawings, photographs, etc. (three) study the spatial and type changes of unconformity For example, the contact between the Ningzhen mountains J1-2xn and overlying strata, unconformity in Qixia mountains, J1-2 and T3h crane concept is parallel unconformity, in Zijin Mountain for the integration of contact relationship. (four) determine the age of unconformity formation Age of formation: the unconformity is the lower limit of the overlying strata relative to the latest stratigraphic age; the upper limit of the stratigraphic age relative to the oldest stratigraphic surface; the absence of the stratigraphic age as an age of formation. Pay attention to two points: Take down the latest age as the lower limit, and the most recent time between the two is the age of unconformity; The time of the same tectonic movement cycle is different from the first, the later, the longer and the shorter, and the missing stratum is not consistent. This is the reflection of the drape curtain's times. The large range happens many times tectonic changes, forming a plurality of angular unconformity and parallel unconformity, in close proximity, where several unconformities are gradually merged into an angular unconformity, the lack of formation is actually a lot, including tectonic crustal movement experienced things many times. Pay attention to the relation between "missing" and "missing", such as the absence of O3, S, D and C1 in O2/C2 in North China, or the original deposition, which was subsequently eroded and lost. Title: stratigraphic contact relation contact relationship of strata classification: geology Author: Guo Hongjun Abstract: two lithostratigraphic units constitute the contact relationship between two sets of different time strata. Generally divided into two types of continuous and discontinuous. When the upper and lower strata have long period sedimentary interruption (i.e. without interruption of the stratigraphic record), is considered to be continuous, as between the upper and lower strata have long period sedimentary interruption (i.e. without interruption of the stratigraphic record), known as integration; if there is a long period sedimentary interruption or subaerial denudation between under formation (i.e. widely... The two lithostratigraphic units consist of two sets of contact relationships between different time strata. Generally divided into two types of continuous and discontinuous. When the upper and lower strata have long period sedimentary interruption (i.e. without interruption of the stratigraphic record), is considered to be continuous, called integration; if there is a long period sedimentary interruption or subaerial denudation between the upper and lower strata (i.e. extensive formation, deletion) is considered to be the stratigraphic discontinuity, called the generalized unconformity (see unconformity). In the traditional concept,
can not be considered only in terms of geometric relations when studying the contact relation between the strata, but under the surface of the sea, the continuity of the contact belongs to the generalized integrated contact even though it has a long period of interruption. Or the erosion surface formed by partial scouring and erosion of the seabed, as long as there is no extensive stratigraphic deletion caused by subaerial denudation, it is still considered to be continuous. Similarly, in the land of the edge of the sedimentary basin in stratigraphic section common level oblique, or oblique layer formed in the riverbed fluvial and cross layer, and the formation of coastal sedimentary section in many small and discontinuous interlayer conglomerate, is still considered to be continuous. Continuity belongs to generalized integrated contact. Not only from the geometric relationship in the study of stratigraphic contact relationship,
in the traditional concept, according to the deposition time interrupt, called integration; if there is a long period sedimentary interruption or subaerial denudation between the upper and lower strata (i.e. extensive formation, deletion) is thought to be the stratigraphic discontinuity, said for the generalized unconformity (see ). If there is no erosion on the ground, the size of the influence area and the change of the tectonic condition of the upper and lower strata, the concrete conclusions can be drawn. The two lithostratigraphic units consist of two sets of contact relationships between different time strata. Generally divided into two types of continuous and discontinuous. When the upper and lower strata have long period sedimentary interruption (i.e. without interruption of the stratigraphic record), is considered to be continuous, called integration; if there is a long period sedimentary interruption or subaerial denudation between the upper and lower strata (i.e. extensive formation, deletion) is considered to be the stratigraphic discontinuity, called the generalized unconformity (see unconformity). In the traditional concept, below the surface in spite of deposition for quite a long period interrupted, or had formed the seabed local scour surface erosion and abrasion, as long as there have been no major cause erosion on land area is still considered to be lack of formation, continuous. Similarly, in the land of the edge of the sedimentary basin in stratigraphic section common level oblique, or oblique layer formed in the riverbed fluvial and cross layer, and the formation of coastal sedimentary section in many small and discontinuous interlayer conglomerate, is still considered to be continuous. Continuity belongs to generalized integrated contact. Not only from the geometric relationship in the study of stratigraphic contact relationship, according to the sedimentary time without interruption, land erosion, influence range formation conditions and on changes, specific analysis and research, we can draw a correct conclusion.