|Table of Contents|

Sedimentary Provenance and Geochronology of Jianshan Formation in Bayan Obo Ore District, the Northern Margin of North China Craton and Their Geological Significance(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2024年第05期
Page:
606-635
Research Field:
基础地质与矿床地质
Publishing date:

Info

Title:
Sedimentary Provenance and Geochronology of Jianshan Formation in Bayan Obo Ore District, the Northern Margin of North China Craton and Their Geological Significance
Author(s):
YANG Jian-jun1 WANG Dong-sheng2* SHE Hong-quan2 LI Yi-ke2 YANG Yue-hou1 KE Chang-hui2 ZHANG Li3 ZHAO Jian4 ZHAO Yang4 GUO Bin3
(1. Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-prospecting, Inner Mongolia Geological Survey Institute, Hohhot 010020, Inner Mongolia, China; 2. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China; 3. Bayan Obo Iron Mine, Baotou Iron and Steel Company, Baotou 014080, Inner Mongolia, China; 4. Barun Mining Co. of Steel Union Co. Ltd. of Baotou Steel(Group)Corp., Baotou 014080, Inner Mongolia, China)
Keywords:
meta-sedimentary rock zircon U-Pb age Archean-Proterozoic sedimentary provenance hydrothermal alteration Jianshan Formation North China Craton
PACS:
P548
DOI:
10.19814/j.jese.2024.03004
Abstract:
The Bayan Obo ore deposit is located in the northern margin of North China Craton, and its country rock, Jianshan Formation, is a set of greenschist facies rocks formed by regional metamorphism. The study on its formation age and provenance is of great significance for understanding the regional tectonic evolution. LA-ICP-MS zircon U-Pb geochronology was conducted on the metasandstone and metamorphic fine sandstone within Jianshan Formation. The zircon ages from metamorphic fine sandstone range from 2 645 Ma to 1 147 Ma, including two main peak ages of 2 510 Ma and 1 390 Ma, respectively. The zircon ages from metasandstone range from 2 722 Ma to 1 847 Ma, including three main peak ages of 2 487 Ma, 1 925 Ma, and 1 859 Ma, respectively. Based on the REE characteristics of zircons, it is believed that zircons of sample By23281 displaying ages from 2 722 Ma to 1 847 Ma belong to typical detrital zircons and the formation age of Jianshan Formation should be later than 1 847 Ma. Based on the field characteristics, REE and morphology of zircons, the 1 761-1 147 Ma age of sample Z5246 represents the process of subsequent hydrothermal alteration, further confirming the magmatic origin of dolomitic carbonate. Based on the previous chronological data in the ore district and its periphery, it is advocated that Jianshan Formation is ultimately formed in the Mesoproterozoic, with its material sources coming from the Archean basement on the northern margin of North China Craton and metamorphic rocks from the Late Paleoproterozoic. In the Mesoproterozoic, Jianshan Formation is significantly altered by post-magmatic hydrothermal alteration of dolomitic carbonate. The ages of the clastic rocks in Bayan Obo ore district record the crustal accretion, collision and break-up events at the northern margin of North China Craton, providing powerful evidence for the study on the regional tectonic evolution during Archean-Proterozoic.

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