Temporal Distribution of Diagnostic Biofabrics in the Lower and Middle Ordovician in North China: Clues to the Geobiology of the Great Ordovician Biodiversification Event
Temporal Distribution of Diagnostic Biofabrics in the Lower and Middle Ordovician in North China: Clues to the Geobiology of the Great Ordovician Biodiversification Event
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DOI：
10.1111/j.1755-6724.2009.00049.x
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发表时间：
2009-06
影响因子：
3.3
通讯作者：
Liu Jianbo;Zhan Renbin
中科院分区：
文献类型：
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作者：
Liu Jianbo;Zhan Renbin
中国北部下奥陶统和中奥陶统诊断生物特征的时间分布清楚地表明，大奥陶世生物多样化事件使古板块上的沉积体系发生了显着变化。在Tremadoc中沉积的前GoBe沉积体系表现为广泛的微生物岩和扁卵石砾岩，生物扰动程度较小。经过早-中奥陶世过渡期，其余早奥陶世和中奥陶世沉积体系转变为GoBe型，以强烈的生物扰动和消失的扁卵石砾岩和潮下微生物沉积为特征。中国北部沉积体系的不可逆变化与戈壁构造有关，在奥陶纪生物多样性过程中，古生物层理的增加、动物群生态空间的扩张以及与古生代进化动物群发育有关的新洞穴的出现。因此，在GoBe的关键时期，沉积体系的变化是海底动物群急剧多样化的结果，而不是GoBe的环境背景。
: The temporal distribution of the diagnostic biofabrics in the Lower and Middle Ordovician in North China distinctly illustrates that the sedimentary systems on the paleoplate have been changed markedly as consequences of the Great Ordovician Biodiversification Event (GOBE). The pre-GOBE sedimentary systems deposited in Tremadoc display widespread microbialite and flat-pebble conglomerates, and a less extent of bioturbation. Through the transitional period of early Floian, the sedimentary systems in the rest of the Early and Mid- Ordovician change to GOBE type and are characterized by intensive bioturbation and vanishing flat-pebble conglomerates and subtidal microbial sediments. The irreversible changes in sedimentary systems in North China are linked to the GOBE, which conduced the increase in infaunal tiering, the expansion of infaunal ecospace, and the appearance of new burrowers related to the development of the Paleozoic Evolutionary Fauna during the Ordovician biodiversification. Thus, changes in sedimentary systems during the pivotal period of the GOBE were consequences of a steep diversification of benthic faunas rather than the GOBE's environmental background.