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The Paleo-Mesoproterozoic boundary: 1.8Ga
Zhao TaiPing1; Pang LanYin1,2; Qiu YiFan1,2; Zhu XiYan3; Wang ShiYan4; Geng YuanSheng5
AbstractThe chronostratigraphic chart describes the timescale of the geological evolutions in the Earth's history, records our understanding of the global evolution, and carries a series of key scientific questions. There are many problems in the current Precambrian Geological Time Scale, yet no new chart has been widely accepted by far. 2.0 similar to 1.8Ga, 1.8 similar to 1.6Ga and 1.6 similar to 1.4Ga are referred as the Orosirian, Statherian and Calymmian in the international chronostratigraphic chart (IUGS 1989-2004), respectively. That is, the transition between the end of orogenesis and the development of stable sedimentary covers is termed Statherian, while the widely development of stable sedimentary covers represents the start of the Mesoproterozoic. The "Lvliang Event" is usually considered as the symbolic tectono-thermal event marking the final solidification of the crystalline basement of the North China Craton (NCC), which was followed by development of extensive platform-type sedimentary covers collectively known as the Changcheng-Jixian-Qingbaikou systems. The deposition of the Changcheng System has long been considered as the beginning of the Mesoproterozoic in China. The boundary between Paleoproterozoic and Mesoproterozoic was set at 1.8Ga according to the end time of the "Lvliang Event". The International Stratigraphic Commission (ISC) launched a new proposal in 2012 for the global Geochronological Time Scale, in which the 2060 similar to 1780Ma period is called the "Columbian", followed by the "Rodinian", the long historical stage from the break-up of the Columbia Supercontinent to the assembly of the Rodinia Supercontinent (1.78 similar to 8.5 Ga). That is, the boundary between Paleoproterozoic and Mesoproterozoic of this new proposal global Geochronologic Time Scale is 1.78Ga, which is largely consistent with the boundary that Chinese scholars have long insisted on. The termination of the "Lvliang Movement" in the NCC is at ca. 1.8Ga. Subsequently, the NCC has been in an intra-continental extension environment until the Late Neoproterozoic. The Changcheng and Jixian systems are basically continental epicontinental deposit. Recent studies showed that the initial age of the Changcheng System in the Yanshan area is ca. 1.7Ga and the boundary between the Changcheng System and Jixian System is 1.6Ga. It is obviously inappropriate to regard the Changcheng System and Jixian System boundary (1.6Ga) as the Paleo-Mesoproterozoic boundary considering the successive sedimentation of these two systems. It is noteworthy that the volcanic rocks of the Xiaoliangling Formation distributed in the Lvliang area in central NCC and the Xiong'er Group in the southern NCC, the largest volcanic-sedimentary rocks globally at that time, are the earliest sedimentary covers overlying the crystalline basement of the NCC dated at 1.8Ga, which is quite close to the new proposed Paleo-Mesoproterozoic boundary. The period between 1.8Ga and 1.6Ga witnesses significant geological changes globally. The orogenic process terminated, the Columbia Supercontinent began to break-up, and the magmatism model, magmatic rock assemblage types and their geochemical characteristics changed significantly, characterized by the development of anorthosite and rappakivi granite in many cratons. Meanwhile, stable sedimentary covers began to develop worldwide, the banded iron formation (BIF) disappeared, shallow-sea iron-rich deposits consisting of oolitic and granular mineral aggregates and marine sulphide deposits and eukaryotes first appeared. All these features marked that the earth's lithosphere, hydrosphere and atmosphere have undergone major turning points, and the biosphere has entered a new evolutionary stage, indicating that the Earth entered into an evolution stage of "middle age". The major reason and detailed information for the Earth turning into the "middle age" are still unclear and further in-depth study is requested, yet the initial point or foremost turning period of this transformation is at ca. 1.8Ga, which should be regarded as the global Paleo-Mesoproterozoic boundary.
KeywordPaleo-Mesoproterozoic boundary 1.8Ga Earth's Middle Age North China Craton Columbia Supercontinent
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000491158400001
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhao TaiPing
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.Henan Inst Geol Survey, Zhengzhou 450001, Henan, Peoples R China
5.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
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GB/T 7714
Zhao TaiPing,Pang LanYin,Qiu YiFan,et al. The Paleo-Mesoproterozoic boundary: 1.8Ga[J]. ACTA PETROLOGICA SINICA,2019,35(8):2281-2298.
APA Zhao TaiPing,Pang LanYin,Qiu YiFan,Zhu XiYan,Wang ShiYan,&Geng YuanSheng.(2019).The Paleo-Mesoproterozoic boundary: 1.8Ga.ACTA PETROLOGICA SINICA,35(8),2281-2298.
MLA Zhao TaiPing,et al."The Paleo-Mesoproterozoic boundary: 1.8Ga".ACTA PETROLOGICA SINICA 35.8(2019):2281-2298.
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