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| 1 | Formation Mechanism of Beach Rocks and Its Controlling Factors in Coral Reef Area, Qilian Islets and Cays,Xisha Islands, China显示文摘Beach rock,which forms at the intertidal zone,is a natural barrier to protect beach and island from wave erosion. The formation mechanism of beach rocks is significant in the study of surface carbonate diagenesis and protection of island. Beach rocks in Qilian Islets and Cays were formed about 500–700 a BP,neither its composition nor sedimentary structure experienced intense post-reformation.Beach rocks in Qilian Islets and Cays are mainly composed of reef-building skeletal fragments and bioclasts without terrigenous sediments. This study focused on the types and morphologies of cements in beach rocks of Qilian Islets and Cays,and its cementation mechanisms and influencing factors. Biological activities,such as micritization caused by microbial activities and algae binding action,play an important role in the initial stage of bioclast transformation and promote the subsequent early marine and early meteoric cementation. Acicular aragonite induced by early marine cementation is well developed in beach rocks,especially in those samples from Medium Islet. Early meteoric cementation is not common as marine cementation,generally presenting granular and meniscus cements. The main factors affecting the formation and development of beach rocks in Qilian Islets and Cays include sediment source,hydrodynamic condition,climate,sea level change and anthropogenic impacts. | Na Zhao Dishu Shen Jian-Wei Shen | 2019 | Journal of Earth Science2019，30，4： | 1 |
| 2 | 川东北飞仙关组鲕粒特征与水动力相关性研究显示文摘早三叠世鲕粒在全球范围内广泛发育,且出现巨鲕。川东北飞仙关组台缘鲕粒滩非均质性强,鲕粒类型复杂。选择川东北龙潭村、莱溪及鱼洞子剖面进行野外实测、镜下鉴定及粒度分析,对鲕粒类型及粒度参数演化与水动力相关性进行研究。研究发现川东北飞仙关组发育7种原生沉积鲕粒,9种后生改造成因鲕粒,其中后生改造成因的破碎鲕可进一步细分。除偏度外,平均粒径、标准偏差、峰度等粒度参数及粒度资料图解曲线形态具有很强的相关性,与鲕粒类型结合判断龙潭村鲕粒滩由活动边缘带转变为稳定鲕粒砂坪沉积,水动力逐渐减小;莱溪呈活动边缘带—稳定鲕粒砂坪—活动边缘带沉积旋回,水动力先减小再增大;鱼洞子向上水动力逐渐减小。但含巨鲕的层位与整体的鲕粒类型及粒度变化趋势相关性较差,这可能是由于巨鲕异常大的粒径形成主要受微生物作用和海水碳酸盐岩饱和度的快速增大复合影响,而非水动力快速变化。因此,在利用粒度参数判断具有巨鲕发育的沉积环境水动力条件时,不能简单地凭借粒度便做出结论,需对鲕粒粒度参数进行相关性分析,去除相关性较差的样品数据。 | 古强 邢凤存 钱红杉 孙汉骁 | 2021 | 沉积学报2021，39，6： | 0 |
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