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Detrital zircon ages of the Silurian-Devonian clastic rocks in south and north banks of Xar Moron River, Inner Mongolia
Alternative TitleDetrital zircon ages of the Silurian-Devonian clastic rocks in south and north banks of Xar Moron River, Inner Mongolia
Cheng ShengDong1; Fang JunQin1; Zhao Pan1; Xu Bei1; Bao QingZhong2; Zhou YongHeng2; Deng RongJing1
2014
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume30Issue:7Pages:1909-1921
AbstractIn order to determine closure time of the paleo-Asian Ocean at the northern margin of North China Craton, sedimentary and detrital zircon U-Pb geochronological studies of the Upper Silurian strata on northern and southern margins of the Xar Moron River have been carried out. Sample LX0831-11 was collected from silty slate of the Upper Silurian Xingshuwa Formation in Shuangjing area (Linxi) of the northern margin of Xar Moron River, which is mainly composed of lithic fragment (50%), quartz (30%) and feldspar (15%) with a few muscovite (5%). Seventy five zircons were selected randomly for LA-ICP-MS U-Pb dating and all of them are concordant. Based on the zircon CL images and U-Pb age concordia diagrams, the zircon can be divided into three groups: 385 similar to 531Ma (N = 52) with a peak age of 412Ma, 872 similar to 1097Ma (N = 11), 1344 similar to 1901Ma (N = 11). The youngest zircon age (385 +/- 8Ma) constrains a maximum sedimentary age of the Middle-Late Devonian. The first group may be related to the denudation of the Early Paleozoic Airgin Sum-Sonidzuoqi-Xilinhot magmatic belt. The second group and the third group show provenance from the Proterozoic basement of the Xing' an-Mongolian Orogenic Belt. Sample 130417-06 was collected from sandstone on the top of Upper Silurian Xiashibei Formation in Xiashibei area (Naiman Banner), which located at the southern margin of Xar Moron River. The Xiashibei Formation consists mainly of limestone, sandstone and slate, and is rich in shallow marine fossils, e. g. corals, bryozoans and stromatoporoids in its middle part, representing a stable continental margin of the North China Craton. The sample is mainly composed of lithic fragment (65%), quartz (30%) and feldspar (5%). Seventy five zircons are selected randomly for U-Pb dating and 69 of them are concordant. Based on the zircon CL images and U-Pb age concordia diagrams, these ages can be divided into four groups 370 similar to 523 Ma (N = 34) with a peak age of 412Ma, 884 similar to 1481Ma (N = 21), 1573 similar to 1900Ma (N = 6) and 2369 similar to 2588Ma (N = 8). For the first age group, the 500 similar to 400Ma zircons may be related to the Early Paleozoic Tuguige-Damaoqi-Ondor Sum-Xianghuang Banner-Jiefangyingzi arc magmatic belt. While 370 similar to 400Ma zircons may come from the Early-Middle Devonian alkaline rocks and mafic intrusion along the northern margin of the North China Craton. The second group corresponds to the Precambrian basement of the Xing' an-Mongolian Orogenic Belt. The third and fourth groups display the similar distribution as the North China Craton, which indicates the North China Craton was a probable source area for the two groups. The Xar Moron River is considered as the Late Paleozoic suture line between the North China Craton and blocks to the north. However, the two samples collected from the both banks of the river show similar detrital zircon age distribution from the Middle Devonian to Mesoproterozoic, which indicates the same provenance for these two samples after the Middle Devonian. On the other hand, because the age distribution of the Songliao Block is characterized by the Newproterozoic to Mesoproterozoic zircons, their occurrence in the north margin of North China Craton suggests that the two blocks were near each other and the Paleo Asian Ocean between them has been closed during the Middle to Late Devonian.
KeywordASIAN OROGENIC BELT U-PB TECTONIC IMPLICATIONS ADAKITIC ROCKS CHINA PETROGENESIS EVOLUTION MARGIN GEOCHRONOLOGY ACCRETION Detrital zircon dating Xar Moron River Inner Mongolia Xingan-Mongolian Orogenic Belt Paleo-Asian Ocean
Indexed ByCSCD
Language英语
CSCD IDCSCD:5188624
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/145906
Collection中国科学院金属研究所
Affiliation1.北京大学
2.中国科学院金属研究所
Recommended Citation
GB/T 7714
Cheng ShengDong,Fang JunQin,Zhao Pan,et al. Detrital zircon ages of the Silurian-Devonian clastic rocks in south and north banks of Xar Moron River, Inner Mongolia[J]. ACTA PETROLOGICA SINICA,2014,30(7):1909-1921.
APA Cheng ShengDong.,Fang JunQin.,Zhao Pan.,Xu Bei.,Bao QingZhong.,...&Deng RongJing.(2014).Detrital zircon ages of the Silurian-Devonian clastic rocks in south and north banks of Xar Moron River, Inner Mongolia.ACTA PETROLOGICA SINICA,30(7),1909-1921.
MLA Cheng ShengDong,et al."Detrital zircon ages of the Silurian-Devonian clastic rocks in south and north banks of Xar Moron River, Inner Mongolia".ACTA PETROLOGICA SINICA 30.7(2014):1909-1921.
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