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首页> 外文期刊>Journal of Asian earth sciences >Relative sea-level changes and sedimentary facies development of the lowermost Cretaceous (Berriasian-Valanginian) cycles in the north of Ar Riyad city, Saudi Arabia
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Relative sea-level changes and sedimentary facies development of the lowermost Cretaceous (Berriasian-Valanginian) cycles in the north of Ar Riyad city, Saudi Arabia

机译：沙特阿拉伯利雅得市北部最低白垩纪（贝里亚斯－瓦朗吉尼）循环的相对海平面变化和沉积相发育

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摘要

A new high-resolution stratigraphic framework for the thick and well-exposed Lower Cretaceous rocks of Saudi Arabia has been provided. The studied successions consist mainly of carbonates with minor interbedded siliciclastics, forming the Silayy, Yamamah and Buwaib formations in the study area (north of Ar Riyad city). Based on the integrated sedimentary fades analysis, a relative sea-level curve for the Berriasian-Valanginian interval has been established, including stacking pattern of the different facies cycles. Two transgressive-regressive facies cycles have been identified and documented in the studied sections. The first cycle started during the middle Berriasian (similar to 143 Ma), comprising the Silayy and Yamamah formations. It terminated at the Yamamah-Buwaib formational contact during the early Valanginian (similar to 138 Ma), characterized by a friable brownish ferruginous sandstone bed at the base of the Buwaib Formation. The second transgressive-regressive cycle encompasses the entire lower Valanginian Buwaib Formation. A major unconformity surface formed during the early late Valanginian (similar to 136 Ma), marking the end of the second cycle and characterized by a distinctive hardground condensation. The correlation and dating of the recognized cycles, identified in central Saudi Arabia, shows a contemporaneity to equivalent surfaces globally and thus strongly supports an isochronous formation of Berriasian-Valanginian facies cycles by eustatic sea-level changes.
机译：为沙特阿拉伯厚而暴露良好的下白垩纪岩石提供了一个新的高分辨率地层框架。所研究的演替主要由碳酸盐与少量互层硅质碎屑组成，在研究区域（阿里雅德市北部）形成了Silayy，Yamamah和Buwaib地层。基于综合的沉积衰变分析，已经建立了Berriasian-Valanginian间隔的相对海平面曲线，包括不同相周期的叠加模式。在研究的部分中已经确定并记录了两个海侵一回归相的循环。第一个周期始于中贝里亚斯时代（类似于143 Ma），包括Silayy和Yamamah地层。它在早期瓦朗吉尼期（约138 Ma）期间在Yamamah-Buwaib地层接触处终止，其特征是在Buwaib地层底部为脆性棕褐色铁质砂岩层。第二个海侵-海退循环涵盖了整个瓦朗吉尼下部布瓦布组。在瓦朗吉尼晚期晚期（类似于136 Ma）形成了一个主要的不整合面，标志着第二个循环的结束，并具有明显的硬底凝结特征。在沙特阿拉伯中部发现的公认周期的相关性和年代，显示出与全球等效表面同时代，因此通过海平面的不断变化强烈支持了Berriasian-Valanginian相周期的等时形成。

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