全球对比化学地层学中的等时线和Walther相定律的例外

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Island Arc Pub Date : 2022-10-30 DOI:10.1111/iar.12470
Wei Wang
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引用次数: 0

摘要

近几十年来,基于各种代用物的化学地层学得到了很好的发展,通过高分辨率、无间隙采样和环境记录进行地层对比。目前,各种类型的样品的定量测量比传统的生物地层学精度更高,应用范围更广。即使底栖指数化石在生物地层对比中被广泛的远洋数据所取代,化石缺口也可能导致剖面数据的断裂。然而,化学地层学仍然面临着挑战,因为它的数据来自沉积物,是解决局部沉积环境和全球相关信号的混合物。如何将这两部分分离,并从混合物中提取局部印记是本研究的主题。等时线是一种新的辅助线,用于从混合信号中提取全局相关信号。等时线是均匀沉积环境平面上的一条虚拟同步线,与提供环境记录的化学地层资料不同,它可以评估全球信号。根据层向横向地层调查、层理面开阔露头格网填图、岩性单元表面格网填图等资料,可以提取出与相无关的化学地层指标。在等时线识别的基础上,设计了一套包括露头横向剖面和网格填图在内的提取非相地球化学信号进行全球对比的方法,揭示了瓦尔特相定律的一个例外。同时,为避免等时线分析对全球化学地层对比的误导,笔者列举了一些实例。该方法包括两翼侧向垂向地层测量、成岩地球化学异常非岩性透镜体测定和微生境测定。以二叠系洛平系—瓜达鲁普系来滨辅助界层型剖面和点为例,通过网格填图,揭示了等时线,提取了全球对比的非相地球化学指标,并隐藏了地球化学透镜。
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Isochronline in chemostratigraphy for global correlation and an exception of the Walther's law of facies

Chemostratigraphy based on various proxies has been well developed in recent decades for stratigraphic correlation by higher resolution, gap-less sampling, and environmental records. At present, various types of samples are measured quantitatively in higher accuracy and wider application than traditional biostratigraphy. Even the benthonic index fossils are widely replaced by pelagic data for biostratigraphic correlation, fossil gaps also could cause data break in a section. However, chemostratigraphy remains challenge as its data from sediments is to resolve mixtureof local depositional environment and global correlatable signal. How to separate these two parts and extract the local imprints free from the mixture is the subject of this study. An isochronlines is a newly introduced auxiliary line for the globally correlatable signal extraction from the mixture signals. An isochronline is a virtual synchronous line on plane of an equal depositional environment, and can evaluate the global signal unlike the chemostratigraphic data that provides environmental records. Based on the data obtained from lateral stratigraphic investigation along a bed strike, or from grid mapping on a wide-open outcrop of a bedding plane, or on a surface of a lithological unit, the facies-independent chemostratigraphic proxies could be extracted. A set of methods was designed including lateral profiling and grid mapping on the outcrop to extract the facies-independent geochemical signal for global correlation based on isochronlines identification, and an exception of the Walther's law of facies was revealed. Meanwhile, the author presents examples to avoid misleading of the global chemostratigraphic correlation based on isochronline analysis. This method included measurement of two-wing lateral-vertical strata, determination of non-lithological lens from geochemical abnormities of diagenesis, and microhabitat. An example from Laibin Auxiliary boundary Stratotype Section and Point of Lopingian-Guadalupian of Permian was measured by grid mapping, that revealed the isochronlines, extracted facies-independent geochemical proxies for global correlation, and hidden geochemical lenses.

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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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