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蓝细菌繁荣滋养的苗岭世光养碳酸盐岩工厂:以安徽寿县卧龙山剖面崮山组为例
投稿时间:2020-07-04  修订日期:2020-09-02  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021044
摘要点击次数: 80
全文下载次数: 98
作者单位地址
梅冥相 中国地质大学地球科学与资源学院 北京市海淀区学院路29号
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:描述、界定和解释无穷多样的碳酸盐岩始终是一个谜团,因为许多复杂的困难和问题只有推测性的答案。碳酸盐生产作用体系形象化地定义为碳酸盐岩工厂,最原始的定义是指指小于15米的清澈浅水环境,因为这是绝大多数碳酸盐生产者的聚居地;后来,基于能量来源,对海相碳酸盐岩工厂提出了一个富有智慧的双重划分,即光养工厂和异养工厂。随着对碳酸盐沉淀作用样式的深入了解,产生了浅海碳酸盐岩工厂或生产作用体系的三重划分,而且被进一步形象化地简称为:1)T-工厂,T 源于热带或水柱的顶部的涵义;2)C-工厂,C代表着冷水或受到控制的沉淀作用;3)M-工厂,在这里M意味着微生物、泥晶和泥丘。寒武纪苗岭世浅水碳酸盐岩工厂,具有以下两个方面的特殊性:首先是光养的,其次是微生物的(蓝细菌繁荣所滋养的),因此可以识别出两个特别的工厂,即光合作用生物膜诱发的放射鲕粒主导的光养T工厂、以及占据着T-工厂位置的蓝细菌微生物席建造的微生物礁主导的光养-M工厂。安徽寿县卧龙山剖面的寒武系苗岭统崮山组,从凝缩段的陆棚相泥岩变浅至强迫型海退体系域浅缓坡相鲕粒滩相灰岩和均一石主导的微生物礁灰岩,形成一个淹没不整合面所限定的三级层序。一个从微生物放射鲕粒滩到均一石主导的微生物礁的沉积序列,组成了该层序的强迫型海退体系域。下部的放射鲕粒主导的鲕粒滩相灰岩,在鲕粒核心、鲕粒皮层以及鲕粒间的泥晶团块或凝块之中,表现出高密度保存的而且较为肯定地类比于现代织线菌的丝状葛万菌化石,表明了光合作用生物膜诱发了放射鲕粒皮层的放射纤维状方解石的沉淀作用,所以不能理解为非生物成因的沉淀物,从而进一步表明鲕粒滩相灰岩代表着一个特别的光养-T工厂;覆盖在鲕粒滩相灰岩之上的均一石主导的微生物礁,也发育着高密度保存而且占据着超过一半体积或面积的丝状葛万菌,从而代表着一个占据着T-工厂位置的特别的光养M-工厂。因此,一个特别的从光养T-工厂到光养M-工厂的演变序列,发育在寒武纪苗岭世较高的大气圈二氧化碳和氧气含量之下的蓝细菌繁荣的方解石海之中。这些现象和重要发现,为进一步了解寒武纪时期与生物矿化作用得到进化的寒武纪后生动物大爆发相重合、以及与蓝细菌繁荣相关联的有机矿化作用产生的光养微生物碳酸盐岩工厂,提供了一个较为罕见的实例。
中文关键词:蓝细菌繁荣  光养碳酸盐岩工厂  崮山组  寒武系苗岭统  安徽省寿县卧龙山剖面  华北地台
 
Photozoan carbonate factory nourished by cyanobacterial bloom of the Cambrian Miaolingian: An example from the Wolongshan section in Shou county of Anhui procince, North-China platform
Author NameAffiliationAddress
MEI Mingxiang School of Earth Sciences and Natural Resources,China University of Geosciences 北京市海淀区学院路29号
Abstract:Since there are lots of intricate and difficult problems having only conjectural answers, describing, characterizing and interpreting the nearly infinite variety of carbonate rocks are conundrums. Carbonate factory are actually refer to production system, its original define refer to the clear neritic marine environment with the depth less than 15 m in which assemble most of carbonate producers. In the later, a double subdivision of the shallow carbonate production system has been proposed according to the energy resource, i.e. the photozoan and heterozoan factories, which represent some conceptual advancement. Along with the further understanding of styles of carbonate precipitation, a threefold subdivision of the benthic carbonate production systems enriched with wisdoms on basis of the carbonate factory principle has been proposed on a geologic scale, i.e. (1) T-factory, in which the T is derived from tropical or “top-of-the-water-column”; (2) the C-factory, in which the C stands for cool-water or controlled precipitation; and (3) the M-factory, in which M represents microbial, micrite, or mud-mound. Two aspects of particularities characterize the carbonate factory of the Cambrian Miaolingian: the first is the photozoan, the second is the microbial (the nourished by cyanobacterial bloom); so it can be discerned two particular carbonate factories, i.e. the photozoan T-factory predominated by radial ooids that are induced by photosynthetic biofilms and the photozoan M-factory predominated by microbial reefs that are built by cyanobacterial mats and also occupied the shallow environments normally filled by the T-factory. The Gushan Formation of the Cambrian Miaolingian at the Wolongshan section in Shou county of Anhui province in southern North-China Platform makes up a third-order sequence bound by drowning unconformity that is marked by an upward shoaling succession from the shelf muddy shales of the condensed section to the oolites covered by microbial reefs (leiolites) of the forced regressive system tract. A sedimentary succession from a grain bank predominated by microbial radial ooids to a microbial reef predominated by leiolites constitute the forced regressive system tract of this third-order sequence. Within the dense and dark micrites making up the core and the cortex of radial ooids as well as the clump or clot among ooids there are high-density preservatation of filamentous Girvanella that is relatively certain to analogical to the modern cyanobacterium Plectonema, which demonstrate that these radial ooids are products induced by photosynthetic biofilms and further delegate a particular photozoan T-factory. Within the leiolites making up the microbial reef overlying the oolite that represent the photozoan T-factory, the high-density preservation of filamentous Girvanella that are more than one half of volume indicates that this set of microbial reefs represents a particular photozoan M-factory. Thus, a special evolutionary succession from a photozoan T-factory to a photozoan M-factory was formed in the calcite sea with the cyanobacterial bloom of the Cambrian Miaolingian under the atmosphere with the most high content of carbon dioxide and relative high content of oxygen. These observations and researches provide a rare example and a insight into the further understanding of a photozoan factory of microbial carbonates of the Cambrian Miaolingian that is formed by organomineralization tied to the cyanobacterial bloom, which is coincided with metazoan radiation benefited from the evolution of biomineralization.
keywords:cyanobacterial bloom  photozoan factory  Gushan Formation  Cambrian Miaolingian  Wolongshan section in Shou county of Anhui province  North-China Platform
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