山东东部近海晚中生代裂陷盆地沉积相研究
发布时间：2018-12-12 04:00
【摘要】：山东青岛海岸线一带遍布超高压-高压变质岩及燕山期花岗岩,但在灵山岛、崂山垭口、唐岛湾地区零星出露一套陆源碎屑岩、火山碎屑岩,研究程度较低且存在很大争议。本文作者所在课题组以上述地区的研究为切入点,结合最新的重磁电资料,首次提出“山东东部近海晚中生代裂陷盆地”这一概念,因此了解研究区内的沉积相-火山岩相的类型、特征、展布规律及时代属性具有重要意义,可以为后期原型盆地恢复和盆山演化分析提供基础资料。本文采取“野外踏勘为主、室内分析为辅”的研究方法,初步成果显示:研究区内主要发育海相浊积岩相、微生物岩相、扇三角洲相和火山岩相。灵山岛自下而上发育(半深海-深海)滑塌浊积岩相-微生物岩相-浊积岩相-火山溢流相-扇三角洲相-火山爆发/溢流相,反映了由深变浅的演化过程。灵山岛下部浊积岩中识别出12种软沉积物变形构造,主要为古地震触发形成,通过对滑塌褶皱、不对称负载构造、软双重构造等软沉积物变形构造的分析,推断:浊积岩沉积时,存在一个SE高,NW低的古斜坡,水体自SE向NW加深,重力流来自SE方向。灵山岛上部的扇三角洲相主要发育前缘亚相,中间夹有3层玄武岩和至少8层火山碎屑流沉积层。崂山-垭口仅发育一套浅变质海相浊积岩。唐岛湾地区主要发育火山通道相和近火山口的火山斜坡亚相。综合前人研究、相分析以及锆石测年结果,认为灵山岛、崂山-垭口海相浊积岩同为白垩纪形成,与胶莱盆地的莱阳群沉积时间相当,具有一定可比性,为山东东部近海晚中生代裂陷盆地内同期异相的产物,且该盆地在晚中生代与海连通。研究区内大套的火山岩、火山碎屑岩与青山群时间相当,灵山岛火山岩中夹的沉积岩可以与胶莱盆地青山群火山岩中发育的紫红色砂砾岩夹层对比。据此推断:胶莱盆地和研究区盆地在白垩纪具有相似的构造背景,且皆由沉积盆地逐渐演化为火山盆地。区内广泛发育的火山岩相充分证明火山作用具有多期次多火山口喷发的特点,它对盆地演化具有重要的控制作用。
[Abstract]:The coastline of Qingdao, Shandong Province is covered with ultrahigh-pressure high-pressure metamorphic rocks and Yanshanian granite, but in Lingshan Island, Laoshan pass and Tangdao Bay, a set of continental clastic rocks and volcanic clastic rocks are exposed sporadically. Based on the research in the above area and the latest gravity magnetoelectric data, the author of this paper proposes for the first time the concept of "late Mesozoic rifting basin in the eastern coastal waters of Shandong Province". Therefore, it is of great significance to understand the types, characteristics, distribution rules and age attributes of sedimentary facies and volcanic facies in the study area, which can provide basic data for the restoration of late prototype basins and the analysis of basin-mountain evolution. In this paper, we adopt the research method of "field exploration as the main part, supplemented by indoor analysis". The preliminary results show that marine turbidite facies, microbial lithofacies, fan delta facies and volcanic facies are mainly developed in the study area. From the bottom to the top of Lingshan Island (semi-deep-sea and deep-sea), the landslide turbidite facies, microbial lithofacies, turbidite facies, volcanic overflow facies, fan delta facies, volcanic eruption / overflow facies are developed, which reflects the evolution process from deep to shallow. Twelve types of soft sediment deformation structures have been identified in the turbidite of the lower part of Lingshan Island, which are mainly triggered by paleoearthquakes. The deformation structures of soft sediments, such as collapse folds, asymmetric load structures and soft double structures, are analyzed. It is inferred that during turbidite deposition there is an ancient slope with high SE and low NW. The water body deepens from SE to NW and the gravity flow comes from SE direction. The fan delta facies in the upper part of Lingshan Island are mainly developed front subfacies with three basalt layers and at least eight layers of volcanic clastic flow deposits in the middle. Laoshan-Yakou only developed a set of shallow metamorphic marine turbidites. The volcanic passage facies and the volcanic slope subfacies near the crater are mainly developed in the Tangdao Bay area. Based on previous studies, facies analysis and zircon dating, it is considered that the marine turbidite of Lingshan Island and Laoshan-Yakou marine turbidite was formed in the Cretaceous period, which is comparable to the deposition time of the Laiyang Group in the Jiaolai Basin. It is a product of synchronal heterogeneity in the late Mesozoic rifting basin off the eastern coast of Shandong Province, and the basin is connected to the sea in the late Mesozoic. The volcanic rocks in the study area are of the same time as the Qingshan group. The intercalated sedimentary rocks in Lingshan Island volcanic rocks can be compared with the gravelly intercalations developed in the volcanic rocks of Qingshan Group in Jiaolai Basin. It is inferred that the Jiaolai basin and the basin in the study area have similar tectonic setting in the Cretaceous period and have evolved from sedimentary basin to volcanic basin. The widely developed volcanic facies in the area fully prove that volcanism has the characteristics of multi-stage and multi-stage volcanic eruption, which plays an important role in controlling the evolution of the basin.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P736.1
[Abstract]:The coastline of Qingdao, Shandong Province is covered with ultrahigh-pressure high-pressure metamorphic rocks and Yanshanian granite, but in Lingshan Island, Laoshan pass and Tangdao Bay, a set of continental clastic rocks and volcanic clastic rocks are exposed sporadically. Based on the research in the above area and the latest gravity magnetoelectric data, the author of this paper proposes for the first time the concept of "late Mesozoic rifting basin in the eastern coastal waters of Shandong Province". Therefore, it is of great significance to understand the types, characteristics, distribution rules and age attributes of sedimentary facies and volcanic facies in the study area, which can provide basic data for the restoration of late prototype basins and the analysis of basin-mountain evolution. In this paper, we adopt the research method of "field exploration as the main part, supplemented by indoor analysis". The preliminary results show that marine turbidite facies, microbial lithofacies, fan delta facies and volcanic facies are mainly developed in the study area. From the bottom to the top of Lingshan Island (semi-deep-sea and deep-sea), the landslide turbidite facies, microbial lithofacies, turbidite facies, volcanic overflow facies, fan delta facies, volcanic eruption / overflow facies are developed, which reflects the evolution process from deep to shallow. Twelve types of soft sediment deformation structures have been identified in the turbidite of the lower part of Lingshan Island, which are mainly triggered by paleoearthquakes. The deformation structures of soft sediments, such as collapse folds, asymmetric load structures and soft double structures, are analyzed. It is inferred that during turbidite deposition there is an ancient slope with high SE and low NW. The water body deepens from SE to NW and the gravity flow comes from SE direction. The fan delta facies in the upper part of Lingshan Island are mainly developed front subfacies with three basalt layers and at least eight layers of volcanic clastic flow deposits in the middle. Laoshan-Yakou only developed a set of shallow metamorphic marine turbidites. The volcanic passage facies and the volcanic slope subfacies near the crater are mainly developed in the Tangdao Bay area. Based on previous studies, facies analysis and zircon dating, it is considered that the marine turbidite of Lingshan Island and Laoshan-Yakou marine turbidite was formed in the Cretaceous period, which is comparable to the deposition time of the Laiyang Group in the Jiaolai Basin. It is a product of synchronal heterogeneity in the late Mesozoic rifting basin off the eastern coast of Shandong Province, and the basin is connected to the sea in the late Mesozoic. The volcanic rocks in the study area are of the same time as the Qingshan group. The intercalated sedimentary rocks in Lingshan Island volcanic rocks can be compared with the gravelly intercalations developed in the volcanic rocks of Qingshan Group in Jiaolai Basin. It is inferred that the Jiaolai basin and the basin in the study area have similar tectonic setting in the Cretaceous period and have evolved from sedimentary basin to volcanic basin. The widely developed volcanic facies in the area fully prove that volcanism has the characteristics of multi-stage and multi-stage volcanic eruption, which plays an important role in controlling the evolution of the basin.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P736.1
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