通过对沉积学和有机岩石学的综合分析,厘清绿亨地层桥溪石灰岩组石灰岩-泥灰岩叠层的成因

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Geology Pub Date : 2024-11-01 DOI:10.1016/j.coal.2024.104640
Zhiyang Li , Maria Mastalerz
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引用次数: 0

摘要

尽管人们普遍认为仙人纪-都龙纪桥溪石灰岩(BCL)中的石灰岩-泥灰岩层理对偶是由地球轨道周期最终驱动的环境条件变化造成的,但很少有人详细研究过BCL层理对偶中有机质(OM)富集和组成(即不同大分子的类型和比例)短期变化的原因。为了填补这一空白,本研究通过沉积学和有机岩石学综合分析对 BCL 进行了研究。在完善的沉积背景下,对美国地质调查局 1 号波特兰岩芯中由不同沉积面类型组成的 7 个石灰岩-泥灰岩层对中的 17 个样品进行了有机岩石学分析,以系统地研究石灰岩-泥灰岩层对中不同表现形式的岩浆成分差异。波特兰 1 号岩心中的 BCL 总体热成熟度较低(玻璃光泽反射率为 0.60%)。所有 BCL 样品都含有主要的海洋 OM,包括沥青质(主要是微粒化)、藻酸盐和锂辉石,以及少量但持续存在的陆相 OM,包括玻璃石和惰性石。OM 的组成和特征与沉积面特征和总有机碳数据相结合,表明通过 BCL 富集和保存的 OM 受各种过程的影响,如底流再加工和掩埋、生物扰动、早期成岩作用和火山灰输入脉冲。这些过程的相互作用导致了沉积速率的变化,而沉积速率的变化可能与海平面的短期相对变化和偶发性火山输入有关。对细粒沉积岩中有机质的组成和质地进行直接研究,可以提供有价值的见解,从过程的基础上了解沉积条件短期变化的原因,这些见解应与其他数据集(如沉积学、地球化学)结合起来,以全面解决调节以明显的周期性岩性变化为特征的类似细粒海洋系统沉积作用的具体机制问题。
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Disentangling causes of the limestone-marl bedding couplets in the Bridge Creek Limestone Member of the Greenhorn Formation through an integrated sedimentological and organic petrology analysis
Although limestone-marl bedding couplets in the Cenomanian-Turonian Bridge Creek Limestone (BCL) have been widely attributed to changes in environmental conditions ultimately driven by Earth's orbital cycles, the causes of short-term variations in organic matter (OM) enrichment and composition (i.e., types and proportions of different macerals) in the bedding couplets through the BCL have rarely been examined in detail. To fill this gap, this study examined the BCL through an integrated sedimentological and organic petrology analysis. With the well-developed depositional context, organic petrology analysis was conducted on 17 samples from seven limestone-marl bedding couplets consisting of different sedimentary facies types in the USGS #1 Portland Core to systematically examine differences in the maceral composition among different expressions of the limestone-marl bedding couplets. The BCL in the #1 Portland Core has overall low thermal maturity (∼0.60 % vitrinite reflectance). All BCL samples contain dominant marine OM including bituminite (dominantly micrinized), alginite, and liptodetrinite and minor but persistently present terrigenous OM including vitrinite and inertinite. The OM composition and characteristics, combined with sedimentary facies characteristics and TOC data, suggest that the OM enrichment and preservation through the BCL is subject to various processes such as bottom current reworking and burial, bioturbation, early diagenesis, and pulses of volcanic ash input. The interplay of these processes led to changes in sedimentation rate, which can be associated with short-term relative changes in sea level and episodic volcanic input. Direct examinations of the composition and texture of OM in fine-grained sedimentary rocks can provide valuable insights into the causes of short-term variations in depositional conditions on a process basis, which should be integrated with other datasets (e.g., sedimentology, geochemistry) to fully resolve the specific mechanism(s) that modulated sedimentation in similar fine-grained marine systems characterized by apparently cyclic lithological alternations.
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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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