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Hydrothermal origin of syndepositional chert bands and nodules in the Mesoproterozoic Wumishan Formation: Implications for the evolution of Mesoproterozoic cratonic basin, North China
Shen, Bing1,2; Ma, Haoran1,2; Ye, Heqing1,2; Lang, Xianguo (郎咸国)1,2,3,4; Pei, Haoxiang5; Zhou, Chuanming (周传明)3,4; Zhang, Shihong6; Yang, Runyu1,2
2018-06
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume310Pages:213-228
Abstract

Abundant chert bands and nodules are discovered throughout the Mesoproterozoic Wumishan Formation (similar to 1.5 Ga) in the North China Block. The middle part of the Wumishan Formation consists of cyclic deposition of calcareous shale, massive microbial dolostone (thrombolites and stromatolites), and laminated dolostone. Chert bands occur most abundantly in the laminated dolostone, although they are also found with lower abundance in other lithologies. Chert bands are normally parallel to the bedding plane, and show soft-deformation structures, suggesting early silicification at or near the water-sediment interface. The Wumishan chert is composed of two types of silica fabric: the microcrystalline and cryptocrystalline quartz that derives from the replacement of host dolomitic rock, and the mosaic/chalcedonic quartz, representing typical void-filling precipitation. We measured the germanium/silica ratios (Ge/Si) and the REE compositions of the chert bands/nodules collected from a 60 m interval in the middle part of the Wumishan Formation in the Mopanyu section. Ge/Si ratios of the buck samples, measured by ICP-MS, range from 13.6 to 35.6 mu mol/mol. Additional LA-ICP-MS analyses allow the measurements of individual silica fabric, providing more detailed information about the geochemistry of chert nodules and bands. Ge/Si ratios of the replacive chert vary between similar to 10 and similar to 20 mu mol/mol, while the mosaic/chalcedonic quartz has wider range of variation (1.1-93.2 mu mol/mol). These values are > 1 order of magnitude higher than the modern seawater value (0.72 mu mol/mol), but is within the range of hydrothermal fluids (3.4-51.3 mu mol/mol, average = 13 mu mol/mol, n = 101), suggesting hydrothermal fluid as an important Si source. This conclusion is consistent with the positive Eu anomaly in the REE pattern. A mass balance calculation indicates that hydrothermal fluid would account for 10-15%, 20-25%, 40-55%, and > 75% of Si for the fluid temperature of 100 degrees C, 150 degrees C, 200 'C, and 250 degrees C, respectively. Although large igneous provinces are not discovered in the North China Block during the deposition of the Wumishan Formation, the studied Wumishan cherts have significant contribution from hydrothermal fluid, which might be related to the early rifting activities in the North China Block before the breakup of supercontinent Nuna.

KeywordGermanium/silica Chert Bands Mesoproterozoic Wumishan Formation North China Block
DOI10.1016/j.precamres.2018.03.007
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000436218200013
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/22629
Collection中国科学院南京地质古生物研究所
其他
Affiliation1.Peking Univ, Key Lab Orogen Belts & Crustal Evolut, MOE, Beijing 100871, Peoples R China;
2.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China;
3.Chinese Acad Sci, CAS Key Lab Econ Stratig & Palaeogeog, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China;
4.Chinese Acad Sci, Ctr Excellence Life & Paleoenviroment, Nanjing 210008, Peoples R China;
5.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China;
6.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Shen, Bing,Ma, Haoran,Ye, Heqing,et al. Hydrothermal origin of syndepositional chert bands and nodules in the Mesoproterozoic Wumishan Formation: Implications for the evolution of Mesoproterozoic cratonic basin, North China[J]. PRECAMBRIAN RESEARCH,2018,310:213-228.
APA Shen, Bing.,Ma, Haoran.,Ye, Heqing.,Lang, Xianguo .,Pei, Haoxiang.,...&Yang, Runyu.(2018).Hydrothermal origin of syndepositional chert bands and nodules in the Mesoproterozoic Wumishan Formation: Implications for the evolution of Mesoproterozoic cratonic basin, North China.PRECAMBRIAN RESEARCH,310,213-228.
MLA Shen, Bing,et al."Hydrothermal origin of syndepositional chert bands and nodules in the Mesoproterozoic Wumishan Formation: Implications for the evolution of Mesoproterozoic cratonic basin, North China".PRECAMBRIAN RESEARCH 310(2018):213-228.
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